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Performance of Bridge Envelope During Earthquake Using Finite Element and Artificial Neural Network Techniques 基于有限元和人工神经网络技术的桥梁围护结构抗震性能研究
The Open Civil Engineering Journal Pub Date : 2022-10-19 DOI: 10.2174/18741495-v16-e2208100
M. Naji, A. Firoozi
{"title":"Performance of Bridge Envelope During Earthquake Using Finite Element and Artificial Neural Network Techniques","authors":"M. Naji, A. Firoozi","doi":"10.2174/18741495-v16-e2208100","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2208100","url":null,"abstract":"\u0000 \u0000 Bridges are one of the most critical parts of a transportation network that may be damaged during earthquakes and it is necessary to have a prediction model for bridge responses under seismic loads that can be extended to other situations. Soil stiffness significantly affects load distribution when soil, piles, abutment, and superstructure all act as a combined system to resist lateral loading on a bridge.\u0000 \u0000 \u0000 \u0000 A two-dimensional (2D) model of integral abutment bridge (IAB) with soil springs around piles and behind the abutments for 18.3m, 35.4m, and 64.5m spans respectively, was developed with finite element (FE). The input variables were bridge span, backfill height, soil stiffness behind abutment, and soil stiffness around piles. Also, Artificial Neural Network (ANN) was examined for pile lateral force, pile displacement, pile head moment, girder axial force, and abutment moment.\u0000 \u0000 \u0000 \u0000 Using FE the prediction of critical response for medium span (i.e., 123.6m) and large span (i.e., 249m) by ANN was performed. Findings show that backfill stiffness has an important effect on lateral displacement. The best performance was related to high stiffness backfill with intermediate clay around the pile.\u0000 \u0000 \u0000 \u0000 Stiffness of clay around the pile has an important effect on lateral displacement, pile lateral force, pile bending moment, girder axial force, and girder bending moment at the abutment.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122436185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Shear Buckling Analysis of Corrugated Web Steel Plate Girder with Random Material Properties 随机材料特性波纹腹板梁的剪切屈曲分析
The Open Civil Engineering Journal Pub Date : 2022-10-13 DOI: 10.2174/18741495-v16-e2208050
H. Kristijanto, B. Piscesa, F. Faimun, D. Iranata, P. Suprobo
{"title":"Shear Buckling Analysis of Corrugated Web Steel Plate Girder with Random Material Properties","authors":"H. Kristijanto, B. Piscesa, F. Faimun, D. Iranata, P. Suprobo","doi":"10.2174/18741495-v16-e2208050","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2208050","url":null,"abstract":"\u0000 \u0000 The non-linear finite element method with initial geometric imperfection is compulsory to capture the shear buckling behavior of the Corrugated Web Steel Plate Girder (CWSPG). These initial geometry imperfections can come from the slender structure that cannot maintain its perfect shape or lousy quality during the assembly process. Most researchers generate the initial geometry imperfection from the elastic buckling modes that may not represent the randomness in the geometric imperfection. Therefore, there is a need to develop a method to generate random initial geometry imperfection without carrying out elastic buckling modes from the analysis.\u0000 \u0000 \u0000 \u0000 This paper investigated the shear buckling behavior of CWSPG using non-linear finite element analysis and proposed a method to generate the initial geometric imperfection using the random material imperfection.\u0000 \u0000 \u0000 \u0000 The random material properties for each meshed element follow a statistically random normal distribution of the material yield strength. The initial geometric imperfection is generated from the first second-order analysis with random material properties (using the in-house 3D-NLFEA package) to the point where the expected buckling shape is obtained. The final deformed geometry from the first second-order analysis is then scaled down to be used as the initial geometric imperfection.\u0000 \u0000 \u0000 \u0000 The proposed method requires the scaling value such that the first buckling load from the available experimental test result and the one from the numerical model are at the same level. The proposed method was able to capture the shear buckling behavior of the CWSPG and was sensitive to the element’s size. The minimum size of the element required normalized with the element thickness was found to be less than four to maintain the accuracy for both the peak and residual load of the CWSPG specimen.\u0000 \u0000 \u0000 \u0000 The proposed method shows excellent agreement in predicting the peak load and the post-buckling behavior of the available test results. Therefore, the proposed method can be used as an alternative method to capture the buckling load of the CWSPG specimen.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126488873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of Ground Calcium Carbonate for Self-compacting Concrete Development based on Various Water Content and Binder Compositions 基于不同含水量和粘结剂组成的碳酸钙粉在自密实混凝土中的应用
The Open Civil Engineering Journal Pub Date : 2022-10-13 DOI: 10.2174/18741495-v16-e2208180
S. Widodo, F. Ma'arif, Zhengguo Gao, M. S. Nugroho
{"title":"Use of Ground Calcium Carbonate for Self-compacting Concrete Development based on Various Water Content and Binder Compositions","authors":"S. Widodo, F. Ma'arif, Zhengguo Gao, M. S. Nugroho","doi":"10.2174/18741495-v16-e2208180","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2208180","url":null,"abstract":"\u0000 \u0000 The development of a Self-Compacting Concrete (SCC) mixture requires a different composition compared to normal vibrated concrete. This experimental study was designed to propose a modification of the concrete mix design formula to produce an SCC mix that meets the specified requirements for both fresh and hardened concrete using Ground Calcium Carbonate (GCC) as local fine powder material.\u0000 \u0000 \u0000 \u0000 The research was carried out with a targeted compressive strength between 30 and 60 MPa. The materials that were used in this research were fine natural aggregate, crushed stone as a coarse aggregate with a maximum size of 19 mm, Portland pozzolan cement (PPC), GCC, freshwater, and high-range water reducer. The properties of fresh concrete were tested using the slump-flow test method, while the compressive strength test was carried out on 50 standard cylinders after 28 days of curing with water immersion.\u0000 \u0000 \u0000 \u0000 Test results indicated that the compressive strength and fresh properties of SCC significantly depend on the water content, the water/cement ratio, the volume ratio between water to the total binder, and the weight ratio between the GCC and Portland cement.\u0000 \u0000 \u0000 \u0000 Furthermore, using the experimental data based on varied water content and binder compositions produces equations with a good fit for SCC mix design in the compressive strength range between 30 MPa to 60 MPa.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131107904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Strength of Lightweight Structural Concrete Acting under Imposed Load 荷载作用下轻量结构混凝土的强度
The Open Civil Engineering Journal Pub Date : 2022-10-07 DOI: 10.2174/18741495-v16-e2208010
G. Okolnikova, F. Al-shaibani, L. A. Saad, Abdullah Abdulrahman saeed Naji, K. Durutlu, P. C. Chiadighikaobi
{"title":"Strength of Lightweight Structural Concrete Acting under Imposed Load","authors":"G. Okolnikova, F. Al-shaibani, L. A. Saad, Abdullah Abdulrahman saeed Naji, K. Durutlu, P. C. Chiadighikaobi","doi":"10.2174/18741495-v16-e2208010","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2208010","url":null,"abstract":"\u0000 \u0000 Expanded polystyrene granules (EPG) can be used as an aggregate for producing lightweight concrete (LWC). EPG was used to make LWC with a density of 1326kg/m3 and 1337kg/m3, while the EPG concrete without fiber had a density of 1320kg/m3. Due to the low strength and brittleness of EPG LWC, the need to improve the properties of this concrete type is necessary.\u0000 \u0000 \u0000 \u0000 The aim of this paper was to research and investigate possible ways of enhancing the mechanical properties of EPG LWC. Hence, the investigation of this research work focuses on the use of chopped basalt fiber (BF) and steel fiber (SF) separately as dispersed reinforcement in EPG concrete to improve the compressive strength of EPG LWC.\u0000 \u0000 \u0000 \u0000 A general review from previous researchers on similar research was conducted, and then the experimental method was used to investigate the effect of BF and SF on the compressive strength of EPG LWC. Nine EPG concrete series were produced and tested. Compression testing was used to measure the compressive strength of the concrete sample. The density was determined by mass volume.\u0000 \u0000 \u0000 \u0000 The results show the effect of BF and SF in the EPG concrete. The EPG reinforced with BF obtained its maximum compressive strength when 1.5% BF was incorporated in the EPG concrete and while EPG concrete reinforced with SF obtained its maximum compressive strength when 1% SF was included in the EPG concrete.\u0000 \u0000 \u0000 \u0000 Based on the results, the amount of fiber added to the EPG concrete affects not just the compressive strength but also the concrete density.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122298361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Environmental Flow Assessment Using Low-Flow Index Method in Upper Citarum River Basin, West Java, Indonesia 基于低流量指数法的西爪哇上游Citarum河流域环境流量评价
The Open Civil Engineering Journal Pub Date : 2022-10-06 DOI: 10.2174/18741495-v16-e221006-2022-2
Ika Sari Damayanthi Sebayang, I. Soekarno, M. Cahyono, A. A. Kuntoro
{"title":"Environmental Flow Assessment Using Low-Flow Index Method in Upper Citarum River Basin, West Java, Indonesia","authors":"Ika Sari Damayanthi Sebayang, I. Soekarno, M. Cahyono, A. A. Kuntoro","doi":"10.2174/18741495-v16-e221006-2022-2","DOIUrl":"https://doi.org/10.2174/18741495-v16-e221006-2022-2","url":null,"abstract":"\u0000 \u0000 This research aimed to determine the amount of environmental flow (EF) required to sustain the river’s function in supporting ecological balance.\u0000 \u0000 \u0000 \u0000 In Indonesia, the Citarum area usually experiences significant environmental challenges, including the overflow of the Citarum River and its watersheds, which causes flooding, and lack of water during the dry season. However, the major challenge is the availability of water in Citarum, attributed to the discharge affecting the ecological balance of the watersheds\u0000 \u0000 \u0000 \u0000 A review of EF was conducted by comparing 7Q10 and Q95 from both the Nanjung discharge observation data and the rainfall-runoff modeling.\u0000 \u0000 \u0000 \u0000 The results found that the Weibull minima method, the 7Q10 result for Sacramento modeling, was 2.18 m3/s while the Nanjung AWLR was 1.24 m3/s. Additionally, the value of Q95 for Nanjung AWLR was 7.17 m3/s, while the result of modeling rainfall-runoff was 7.06 m3/s.\u0000 \u0000 \u0000 \u0000 It is necessary to ensure that the amount of discharge available can support the ecological conditions in the Upper Citarum River Basin area. This was relevant since the difference was certainly affecting the ecological balance and the management of the Citarum River.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"264 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115997692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Detection of Rockfalls on Tunnel Faces Using Extracted Moving Objects, Excavation Point Estimation, and Generation of Trajectory Images 基于移动目标提取的隧道岩崩检测、挖掘点估计和轨迹图像生成
The Open Civil Engineering Journal Pub Date : 2022-10-04 DOI: 10.2174/18741495-v16-e2207130
Rei Kobayashi, Yoshihiro Sato, Yoshiki Takahashi, Masahito Maemura, Masaya Miura, Yue Bao
{"title":"Detection of Rockfalls on Tunnel Faces Using Extracted Moving Objects, Excavation Point Estimation, and Generation of Trajectory Images","authors":"Rei Kobayashi, Yoshihiro Sato, Yoshiki Takahashi, Masahito Maemura, Masaya Miura, Yue Bao","doi":"10.2174/18741495-v16-e2207130","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2207130","url":null,"abstract":"\u0000 \u0000 Tunnels are constructed at various locations for infrastructural purposes. During tunnel construction, industrial accidents have occurred due to rockfalls at tunnel faces. In addition, it has been confirmed that large rockfalls are precursors to tunnel collapses. Visual monitoring is currently used to detect such rockfalls. However, there are limitations to visual monitoring, and monitoring equipment is needed.\u0000 \u0000 \u0000 \u0000 In existing research, the inter-frame difference method of image processing and laser measurement methods have been proposed. However, there are difficulties in monitoring the entirety of the tunnel face using these methods. Thus, we propose methods that can overcome these difficulties and accurately detect rockfalls and identify where they occur.\u0000 \u0000 \u0000 \u0000 In this study, we propose a method for detecting rockfalls by combining the extraction of moving objects on a tunnel face and the estimation of excavation points. To identify the location of the rockfalls, rockfall trajectory images were generated.\u0000 \u0000 \u0000 \u0000 Through experiments conducted during excavation, it was confirmed that the proposed method could correctly identify and detect only rockfalls in real time and identify the locations where they occurred.\u0000 \u0000 \u0000 \u0000 In this study, only rockfalls of 52 mm x 71 mm in size are detected in real time. It can enable workers to evacuate and prevent industrial accidents. In addition, by identifying the location of rockfalls, it is possible to know the danger level of the tunnel face.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117273392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanical Performance and Durability of Date Palm Fibers Repair Mortar 枣椰树纤维修补砂浆的力学性能和耐久性
The Open Civil Engineering Journal Pub Date : 2022-09-30 DOI: 10.2174/18741495-v16-e2207271
W. Yahiaoui, Abdelraouf Kenai, B. Menadi, S. Kenai
{"title":"Mechanical Performance and Durability of Date Palm Fibers Repair Mortar","authors":"W. Yahiaoui, Abdelraouf Kenai, B. Menadi, S. Kenai","doi":"10.2174/18741495-v16-e2207271","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2207271","url":null,"abstract":"\u0000 \u0000 Concrete is the most widely used material in the world after water. However, concrete could be damaged under aggressive environments and many concrete structures require repair and frequent maintenance. Readymade mortars with and without synthetic fibers such as polypropylene and acrylic are often used as repair mortars. The partial replacement of cement by supplementary cementitious materials and the use of alternative fibers such as natural and agro-waste fibers could reduce the environmental impact of readymade mortars.\u0000 \u0000 \u0000 \u0000 This paper presents a comparative study between the performance of laboratory made and ready-made repair mortars. The laboratory repair mortars were based on date palm fibers and local mineral additions (slag and natural pozzolan). The volume ratio of date palm fibers addition was 0.75% and mineral additions content were fixed at 15% as cement replacement. Compressive strength, flexural strength, shrinkage and the bond strength by slant shear test and tensile strength of concrete by the pull-off method were investigated. The durability of the mortar was evaluated by water capillary absorption.\u0000 \u0000 \u0000 \u0000 The results indicated that the addition of natural fibers and the substitution of cement by 15% of mineral additions improves the flexural strength but reduces the compressive strength of the fiber-reinforced repair mortar. The lowest values of total shrinkage, water capillary absorption and sorptivity were observed for repair mortars based on acrylic fibers compared to repair mortars with natural vegetables fibers.\u0000 \u0000 \u0000 \u0000 The mechanical and durability performances of laboratory made repair mortars were comparable to those of readymade mortars.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129640983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Mechanical Strength and Water Transport Properties of Concrete Containing Treated Recycled Aggregates 含处理过的再生骨料混凝土的机械强度和输水性能
The Open Civil Engineering Journal Pub Date : 2022-09-30 DOI: 10.2174/18741495-v16-e2206060
Brian Jacks Odero, R. Mutuku, T. Nyomboi, Z. Gariy
{"title":"Mechanical Strength and Water Transport Properties of Concrete Containing Treated Recycled Aggregates","authors":"Brian Jacks Odero, R. Mutuku, T. Nyomboi, Z. Gariy","doi":"10.2174/18741495-v16-e2206060","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2206060","url":null,"abstract":"\u0000 \u0000 The objective is to determine the effect of treated RCA on the mechanical strength of hardened concrete, and determine the influence of treated RCA on water transport within the matrix of hardened concrete.\u0000 \u0000 \u0000 \u0000 The study aims to use pozzolanic concentration of cement and RHA slurry to pretreat coarse RCA for full replacement of NCA for sustainable concrete production.\u0000 \u0000 \u0000 \u0000 One of the common modes of disposal of construction waste is strained landfills. This study proposes a constructive way of recovering the coarse aggregates of recycled aggregates from laboratory concrete waste taken through a focused treatment process with pozzolan. The study aims to replace the proportions of the cement slurry to treat and replace with rice husk ash (RHA) for the modification of recycled concrete aggregate (RCA) and replace fully natural coarse aggregate (NCA) for sustainable concrete production. One of the main challenges of recycled concrete aggregate (RCA) is the fractured surface, which often results in reduced strength and loss of concrete durability. The strength of concrete with RCA is principally influenced by the fractured hardened paste attached to the surface, predominantly characterized by voids and gaps resulting from its production using a mechanical method. High water penetration within and around the aggregate matrix due to the presence of micro- and macro-cracks results in strength and durability deterioration of concrete.\u0000 \u0000 \u0000 \u0000 This study addresses these problems by specifying aggregate treatment with a pozzolanic slurry of cement and RHA. This was conducted in two (2) phases; first, to determine the optimum proportion of cement slurry concentration (0, 20, 40, 60, 80, and 100%), and second, to increase the silicate formation in cement slurry by substituting the proportions of cement with RHA (0, 5, 10, and 15%). The performance of concrete was evaluated by mechanical strength (compressive and split tensile strength) at 7, 28, and 56 days and water transport within the concrete (surface suction and submergence) at 28 and 56 days of curing age.\u0000 \u0000 \u0000 \u0000 The use of cement slurry treatment at various concentrations generally increased compressive strength at 28 days compared to untreated RCA. The findings show that at a 20% concentration of cement slurry, the increase in compressive strength is 38.4%. Upon replacement of cement in treatment slurry of RCA with 5% RHA, the increase in compressive strength was 61%, while the split tensile strength increased by 10.2%. The amount of water absorbed was observed after 30 minutes of full submergence in water, indicating that samples with 20% cement concentration at 28 days resulted in the lowest water absorption of 2.01%. However, with the replacement of 5% RHA, the water absorption slightly increased to 2.3%, but still less than the requirement of 3.5%. The corresponding test results for water suction by capillarity, initial and secondary sorptivity coefficients (Si and Ss) were found to be 0.0","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125558219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluating the Management of Critical Success Factors of Residential Complex’s Projects and their impact on Cost, Time, and Quality in Erbil Governorate 评估埃尔比勒省住宅综合体项目关键成功因素的管理及其对成本、时间和质量的影响
The Open Civil Engineering Journal Pub Date : 2022-09-27 DOI: 10.2174/18741495-v16-e2207270
A. Mohammed
{"title":"Evaluating the Management of Critical Success Factors of Residential Complex’s Projects and their impact on Cost, Time, and Quality in Erbil Governorate","authors":"A. Mohammed","doi":"10.2174/18741495-v16-e2207270","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2207270","url":null,"abstract":"\u0000 \u0000 The characteristics of any project require a specific type of management. Companies and project management associations all over the world started to develop and follow these standards. Best practices in project management, if followed, may increase the chances of success in achieving goals when dealing with projects. Many studies and researchers worked earlier on critical success factors (CSF). Each type of project has its own CSF that should be considered during construction.\u0000 \u0000 \u0000 \u0000 This study focuses on covering the notion of residential complex projects (RCP) success according to two fundamental components (success criteria and critical success factors by identifying the critical success factors (CSF) on the basis of their large impact on the golden triangle (cost, time, and quality), and calculating the degree of actual practicing of each factor.\u0000 \u0000 \u0000 \u0000 A questionnaire survey has been adopted and distributed to a sample of 142 stakeholders involved in the construction of residential complex projects to calculate their impact on time, cost, and quality. Moreover, a case study for 20 constructed projects has been adopted to evaluate the average fulfilments of 8 identified management success criteria and 8 identified project success criteria using a questionnaire survey. Finally, the degree of management success and project success for each project has been calculated.\u0000 \u0000 \u0000 \u0000 The results reveal 17 CSF ranging between large and very large impact on managing residential complex projects. The highest rank is realistic cost estimate and projects completed within the budget, adequate risk identification and management procedures, adequate project management tools, techniques, and standards. The study revealed that project success criteria differ from one project to another and the relative priorities among critical success factors may change for different projects even if they are of same type not only among different types of projects. The results show that management success doesn’t guarantee project success because success means different things to different people. User’s satisfaction is essential for project success.\u0000 \u0000 \u0000 \u0000 A scientific base should be used to identify CSF with a significant impact on the golden triangle and combine it with project success criteria. That is the classic answer for the measurement success, because it could be easily applied and normally gathers consensus within stakeholders. This study will contribute an improvement to the existing management system.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131311936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of Multiple Helical Fillets Surface to Suppress Rain-wind Vibration of Stay Cables: A Wind Tunnel Investigation 多螺旋圆角面抑制斜拉索风雨振动的优化:风洞研究
The Open Civil Engineering Journal Pub Date : 2022-09-26 DOI: 10.2174/18741495-v16-e2206270
Duy-Thao Nguyen, D. Vo, Viet Hai, M. N. Haque
{"title":"Optimization of Multiple Helical Fillets Surface to Suppress Rain-wind Vibration of Stay Cables: A Wind Tunnel Investigation","authors":"Duy-Thao Nguyen, D. Vo, Viet Hai, M. N. Haque","doi":"10.2174/18741495-v16-e2206270","DOIUrl":"https://doi.org/10.2174/18741495-v16-e2206270","url":null,"abstract":"\u0000 \u0000 To develop a new cable surface for control rain wind induced cable vibration of stay cable.\u0000 \u0000 \u0000 \u0000 Stay cables are light and vulnerable structures. Therefore, it can be easily excited by wind or rain wind interaction. Stay cables wrapped with a single helical fillet have been proposed so far. However, these countermeasures could prevent cable vibration well, especially in dry conditions.\u0000 Objective: Therefore, the objective of this research is to develop a new cable surface to control not only RWIV but also dry galloping of stay cable. \u0000 \u0000 \u0000 \u0000 A wind tunnel test will be used to investigate the RWIV characteristics and its new countermeasure.\u0000 Results: First, a rain wind-induced vibration of circular stay cable was reproduced in a wind tunnel environment. The effect of upper and lower water rivulets was examined to understand their role on RWIV better. A rainfall simulator was employed to generate artificial rainfall for two different wind tunnel experiments. Finally, to control the RWIV of stay cables, novel multiple helical surface fillets were used. The upper and lower rain rivulets can play a significant role in energizing the RWIV. It was also found that the multiple helical surface fillets can suppress the cable vibration well both in wet and dry conditions. \u0000 \u0000 \u0000 \u0000 Multiple helical fillets cable surface could successfully prevent both the RWIV and dry galloping. To fabricate helical fillet cable to control cable vibration, 04 to 12 fillets with sizes ranging from 3mmx7.5mm to 5mmx7.5mm and a pitch of 2.95D-4.78D (D: cable diameter) are the most influential parameters and suggested herewith for practical application.\u0000","PeriodicalId":350575,"journal":{"name":"The Open Civil Engineering Journal","volume":"11 50","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120924856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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