HBRC Journal最新文献_第8页

Probabilistic analysis of strip footings resting on soil with uncertain properties 不确定地基上条形基础的概率分析

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1838739

A. Ashraf, M. Bakry, Kamal Ismail

{"title":"Probabilistic analysis of strip footings resting on soil with uncertain properties","authors":"A. Ashraf, M. Bakry, Kamal Ismail","doi":"10.1080/16874048.2020.1838739","DOIUrl":"https://doi.org/10.1080/16874048.2020.1838739","url":null,"abstract":"ABSTRACT The safety level of geotechnical problems has long been taken into account via a global safety factor (Fs). The role of this factor is to globally overcome the risks related to possible errors that may arise during field or laboratory tests. Indeed, there is no scientific basis for suggesting the value of Fs. For most geotechnical problems, it is suggested to take a safety factor of 3. This suggestion is arbitrary and does not take into account the circumstances of the problem under consideration. In the present paper, a more efficient approach to evaluate the safety level of geotechnical problems is employed. This is the probabilistic approach. This approach allows taking into consideration the uncertainty of soil properties arises from possible sources of errors. In the probabilistic approach, the safety level of geotechnical problems is expressed by means of the probability of failure (Pf). Several probabilistic methods to compute the Pf value can be found in literature. In the present paper, a robust and accurate method called Monte Carlo Simulation (MCS) is employed to present a probabilistic analysis of a strip footing resting on a clayey sand soil with uncertain soil properties.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"365 - 380"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1838739","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46687134","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

Long-term deflections of FRP reinforced concrete beams FRP筋混凝土梁的长期挠度

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1812897

M. Issa, E. Ismail

{"title":"Long-term deflections of FRP reinforced concrete beams","authors":"M. Issa, E. Ismail","doi":"10.1080/16874048.2020.1812897","DOIUrl":"https://doi.org/10.1080/16874048.2020.1812897","url":null,"abstract":"ABSTRACT Concrete beams reinforced with fiber-reinforced polymer bars (FRP) are becoming widely used. The sustained deflections due to creep and shrinkage for these beams control the design due to the low modulus of elasticity of FRP bars. The current work presents a successful finite elements modeling for tests on FRP reinforced concrete beams along with study for some factors influencing the long-term deflection such as the reinforcement ratio and the type and the level of sustained load. Increasing the FRP reinforcement ratio results in reduction in the total sustained load deflection. Similarly, for the reduction in the sustained load level. Carbon FRP reinforced beams have the least total long-term deflections. FRP design codes such as ACI 440.1 R-06 and CSA-S806-02 provide simple equations for calculating the sustained deflection based on multiplicative factors. Also, the literature gives other equation for creep and shrinkage deflections based on multiplicative coefficients. The three original methods and the same methods with their amendments are verified against experimentally calibrated finite element models. The ACI440.1 R-06 method modified with Bischoff’s effective moment of inertia is found to yield the best results. The current paper further modifies this method. The currently modified ACI440.1 R-06 with the effective moment of inertia as proposed by Bischoff is found to produce better accuracy for the calculations of the total sustained load deflections.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"269 - 282"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1812897","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45868971","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: 3

Collaboration and BIM model maturity to produce green buildings as an organizational strategy 协作和BIM模型成熟，以生产绿色建筑作为组织战略

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1807815

A. Mohammed

{"title":"Collaboration and BIM model maturity to produce green buildings as an organizational strategy","authors":"A. Mohammed","doi":"10.1080/16874048.2020.1807815","DOIUrl":"https://doi.org/10.1080/16874048.2020.1807815","url":null,"abstract":"ABSTRACT Each organization or work team adopts a specific strategy to produce and execute green buildings because there is no reliable strategy by BIM. Although a BIM model includes many disciplines; however, each company relies on an individual tactic in executing this model, which negatively affects the maturity level of the model due to unguided organizational experience and lack of integrating BIM technologies. Therefore, the research sought to regulate and optimize the collaboration and maturity level of a BIM model as a strategic basis to produce and execute green projects. Therefore, the study addressed the BIM concept, the correlation origin between collaboration and BIM model maturity, and the way to optimize collaboration as a system and qualify individuals through it. The potential of attaining the highest maturity level of a BIM model was investigated, besides overcoming the difficulties related to the evaluation of their business value. The study verified the correlation between BIM and green buildings; and, demonstrated the role of collaboration and BIM maturity level within green assessment systems. Accordingly, the study concluded, formulated, and validated a framework based on collaboration and maturity potentials of a BIM model as an organizational strategy to produce green projects by BIM.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"243 - 268"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1807815","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42035888","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: 3

Strengthening of existing RC buildings by using autoclaved aerated concrete infill wall 用蒸压加气混凝土填充墙加固现有钢筋混凝土建筑物

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1789392

Mostafa Ali Taha Ali Okasha, Mohamed E. Abdel Razek, H. EL-Esnawi

{"title":"Strengthening of existing RC buildings by using autoclaved aerated concrete infill wall","authors":"Mostafa Ali Taha Ali Okasha, Mohamed E. Abdel Razek, H. EL-Esnawi","doi":"10.1080/16874048.2020.1789392","DOIUrl":"https://doi.org/10.1080/16874048.2020.1789392","url":null,"abstract":"ABSTRACT The objective of this study is to use autoclaved aerated concrete (AAC) for infill walls in existing buildings that are unsafe for earthquakes to increase their stiffness. The study included two topics; the first topic introduced six models using AAC in buildings resistance to earthquakes and the effect of self-weight of the buildings comparing bare frame clay partition masonry model (1), bare frame AAC partition masonry model (2), reinforced concrete frames clay infill wall model (3), reinforcement concrete frames AAC infill wall model (4), reinforcement concrete frames AAC infill wall core model (5), reinforcement concrete frames AAC infill wall first and second floors model (6). ETABS software was used to investigate all frame models. Results of the study revealed that AAC infill wall decreases base moment, base shear and displacement. On the other hand, second topic presented five models of single reinforcement concrete frame under lateral loading, considering effect of anchored and unanchored AAC infill wall and clay infill wall. These models are bare frame model (a), RC frame with clay infill wall unanchored model (b), RC frame with AAC infill wall unanchored model (c), RC frame with clay infill wall with anchors model (d), RC frame with AAC infill wall with anchors model (e). Using finite element software (ANSYS WORKBENCH 18.2) failure load, displacement and ductility were presented for all five frames. The results showed that the ‘RC frame with AAC infill wall with anchors’ model gives the biggest failure load whereas displacement and ductility are the lowest.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"143 - 155"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1789392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48578683","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: 3

Innovative production of structural light-weight concrete by manufactured porous basalt aggregates 通过制造多孔玄武岩集料创新生产结构轻质混凝土

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1853011

Haytham Amr El-Kafrawy, S. Taher, S. Mahfouz

{"title":"Innovative production of structural light-weight concrete by manufactured porous basalt aggregates","authors":"Haytham Amr El-Kafrawy, S. Taher, S. Mahfouz","doi":"10.1080/16874048.2020.1853011","DOIUrl":"https://doi.org/10.1080/16874048.2020.1853011","url":null,"abstract":"ABSTRACT Structural Lightweight Concrete (SLWC) is rarely used in Egyptian construction industry because of the unavailability of appropriate lightweight aggregates that capture its salient features. The aim of this research is to produce aggregates of low density and reasonable strength suitable for SLWC and to add new perspective for the structural lightweight concrete in the Egyptian market causing a reflection on the ECP 203 by adding limitations concerning the lightweight aggregates, as the only limitation for lightweight concrete is to install it for architecture uses. In this paper, an innovative procedure for producing SLWC using locally Manufactured Porous Basalt Aggregates (MPBA) is presented as a side product to basalt fiber industry. The scope of work is an experimental investigation to produce the MPBA then examine the feasibility to obtain SLWC. The physical and mechanical properties of Parent Basalt Rocks (PBR) are calibrated then the methodology of producing MPBA is explained and the obtained properties are assessed. The new MPBA is produced when solid basalt is melted and mixed with polypropylene through an established optimum mixing. The newly proposed process includes a sequence of temperature variations using both methods the Rheocasting and Thixocasting process. The phase diagram is illustrated showing the melting point of the basalt rocks and the MPBA. The produced MPBA is further used for SLWC mixes and the presented data provide the possible properties needed to figure out a new material.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"381 - 396"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1853011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43128567","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

Using smart glazing for reducing energy consumption on existing office building in hot dry climate 在干热气候下使用智能玻璃降低现有办公楼的能耗

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1794226

A. M. Nageib, Abbas El-Zafarany, Mohamed Helmy El-Hefnawy, F. Mohamed

{"title":"Using smart glazing for reducing energy consumption on existing office building in hot dry climate","authors":"A. M. Nageib, Abbas El-Zafarany, Mohamed Helmy El-Hefnawy, F. Mohamed","doi":"10.1080/16874048.2020.1794226","DOIUrl":"https://doi.org/10.1080/16874048.2020.1794226","url":null,"abstract":"ABSTRACT Office buildings in Upper Egypt suffer from high temperature in summer due to solar radiation of this extreme hot arid climatic region. The effect of smart glass on reducing energy consumption in office buildings is well studied in temperature climates but rarely addressed for this Region. This paper aims to compare different types of glazing to define which achieves a better balance between reducing cooling energy consumption and daylight saving. Six types of glazing were simulated on the main office building of Sohag governorate – Egypt. The simulation was carried out for all orientations. Energy Plus-Design Builder simulation tool has been used to study the effect of smart glass on increasing energy efficiency. The window area-to-floor ratio was 8%, 16%, 24% and 32%. Simulation results show that smart glazing is more effective than traditional windows. Electro-chromic glass achieved the best results in reducing cooling energy consumption for window area of 32%. Also, achieving a significant reduction in cooling loads up to 43% in East orientation, 46% in South orientation and 45% in West orientation. On the other hand, it reduced glare in the East and West orientation by 64%. And, it reduced consumption of lighting energy by 60%, 61% and 57% in East, South and West, respectively. The effect of Gaso-chromic was increased when the window area ratio increased to 32%. For window area 32%, Gaso-chromic achieved the results of light energy similar to Electro-chromic.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"157 - 177"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1794226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46356082","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: 14

Lateral loading resistance for shell foundations 壳体基础的横向荷载阻力

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1802691

M. Abdel-Rahman

{"title":"Lateral loading resistance for shell foundations","authors":"M. Abdel-Rahman","doi":"10.1080/16874048.2020.1802691","DOIUrl":"https://doi.org/10.1080/16874048.2020.1802691","url":null,"abstract":"ABSTRACT Shell foundations, or geometrically shaped footings, were first used as a substitute for the conventional flat shallow foundations in the nineteen fifties in Mexico, West Germany, India, China and the Soviet Union. It is not known whether their use was developed independently or was incorporated after observing their use elsewhere. However, it is certain that their use was not based on any research data that has been reported at that time. Since then, the use of shell foundations has drawn considerable interest around the world. Experimental and theoretical investigations by the author on ‘shell type’ foundations have shown significant increases in bearing capacity, better settlement characteristics, and ability to resist higher lateral forces which might be induced due to wind loads or earthquakes as compared to the conventional flat foundations. This is primarily due to partial absorption of the vertical load through lateral compression of the soil particles under the shell. Given these attributes, the practical implications could make shell foundations ideally suited for foundations subjected to lateral loadings. It is also known that shell foundations require less construction materials, which could benefit its use in developing countries where materials are scarce and expensive while labor is abundant and inexpensive. This paper presents analytical analysis of shell and flat foundations subjected to lateral loading. The results of this study will be presented in the form of a comparative study and numerical example, which will demonstrate that shell foundations are superior to resist lateral loading.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"227 - 241"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1802691","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49003956","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: 3

Developing a multi-criteria index for government projects performance 制定政府项目绩效的多标准指数

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1819743

Amr Mossalam

{"title":"Developing a multi-criteria index for government projects performance","authors":"Amr Mossalam","doi":"10.1080/16874048.2020.1819743","DOIUrl":"https://doi.org/10.1080/16874048.2020.1819743","url":null,"abstract":"ABSTRACT Current project management practices recognize at least six competing constraints that need to be balanced and prioritized in order to maximize the probability of achieving project success. However, the market tends to measure the success through limited metric(s), which mainly focuses in the time performance. This study established a performance metric, which takes into consideration project financials, risks and issues in addition to time which is a step toward shifting the focus to other success criteria. The validity and sanity of the overall formula was checked by a series of steps. The validation was conducted by a parametric study, which included trend checks, checking the extreme values, normalizations, and finally to an expert focus group to improve, validate, and the index. The formula was then applied to ongoing projects data, which showed reliable results. The developed project performance index can be widely used in overseeing portfolios’ overall status or comparing performance between different functional units. The index is flexible and can be adapted to incorporate more criteria to get a holistic overview of projects’ health.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"299 - 316"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1819743","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42073489","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

Dynamic behavior of pile foundations under vertical and lateral vibrations: review of existing codes and manuals 桩基础在垂直和横向振动下的动力特性：对现有规范和手册的审查

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1729586

M. Khalil, Asmaa M. Hassan, H. Elmamlouk

{"title":"Dynamic behavior of pile foundations under vertical and lateral vibrations: review of existing codes and manuals","authors":"M. Khalil, Asmaa M. Hassan, H. Elmamlouk","doi":"10.1080/16874048.2020.1729586","DOIUrl":"https://doi.org/10.1080/16874048.2020.1729586","url":null,"abstract":"ABSTRACT Designing structures subjected to dynamic loads is quite complex and involve structural, mechanical, geotechnical engineering and the theory of vibration. Machines, buildings under seismic effect, and wind turbines induce both dynamic and static loads on their foundations. If these structures are supported on piles, a full understanding is required of the dynamic interaction between individual piles and soil (pile-soil interaction) and between adjacent piles (pile-soil-pile interaction). Due to the complexity of this problem, codes and manuals recommend the use of approximate approaches. However, there is a general lack in research concerning the accuracy of these approaches. The present paper aims to help filling this gap by comparing the recommendations from selected codes and manuals with the results obtained from the numerical analysis. The codes and manuals considered in this paper are the Egyptian Code (EC), ACI, and the Canadian Manual (CM). This comparison is held over a range of parameters including excitation force frequency (f), soil modulus of elasticity (Es), pile slenderness Ratio (L/D), dimensionless spacing ratio (S/D) and pile group size (ng). At the end of this study, advantageous and downfalls of these approaches are discussed.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"39 - 58"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1729586","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46330549","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

Suez Canal Region as an economic hub in Egypt location analysis for the mass real estate appraisal process 苏伊士运河区作为埃及经济枢纽的地段分析为大众房地产估价过程

HBRC Journal Pub Date : 2020-01-01 DOI: 10.1080/16874048.2020.1734347

R. Hafez, Ibrahim Madney

{"title":"Suez Canal Region as an economic hub in Egypt location analysis for the mass real estate appraisal process","authors":"R. Hafez, Ibrahim Madney","doi":"10.1080/16874048.2020.1734347","DOIUrl":"https://doi.org/10.1080/16874048.2020.1734347","url":null,"abstract":"ABSTRACT Egypt is positioned to become one of the most prolific countries in the emerging global economy, so it is important to put in place the infrastructure and logistics systems that will enable Egypt to play a real role as an African hub point of entry and exit for trade between Asia, the Middle East, and Europe in the dominant directions from south to north where oil and gas transit. Nearly 10% of the world trade is passing through the Suez Canal. An implementation strategy was prepared for the Suez Canal region aims to create an industrial and logistical spine, two integrated areas, two development areas, four ports, are underdeveloped. In order to explore these areas for foreign investment, a mass real estate appraisal study for industrial lands and ports was prepared with the aim of exploitation as usufruct for specified periods. Therefore, the paper studies the Suez Canal Development Project as an economic hub; then, it focuses on the methodology that used in the real estate appraisal study which had concluded to the pricing equations for each site taking into all various aspects. The research aims to shed light on this project as a leading model for mass real estate appraisal study in the Arab Republic of Egypt.","PeriodicalId":31454,"journal":{"name":"HBRC Journal","volume":"16 1","pages":"59 - 75"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/16874048.2020.1734347","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47959107","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