Electronic Journal of Structural Engineering最新文献_第10页

Influence of Accelerators on cement replacement by large volumes of Fly ash to achieve early strength 促进剂对大掺量粉煤灰替代水泥达到早期强度的影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-06-01 DOI: 10.56748/ejse.182612

P. Ananyachandran, V. Vasugi

{"title":"Influence of Accelerators on cement replacement by large volumes of Fly ash to achieve early strength","authors":"P. Ananyachandran, V. Vasugi","doi":"10.56748/ejse.182612","DOIUrl":"https://doi.org/10.56748/ejse.182612","url":null,"abstract":"The chemical admixtures named as accelerators improve the early setting and strength of cementations products whereas theh Cement prepared with large volumes of Fly ash (Pozzolana) fetch the durability and better sustainability. Achieving High early strength as well as durability in cementations products is a tough and challenging job which provokes the idea of the addition of accelerators to cement prepared with large volumes of Fly ash (pozzolana). The present study investigated the early setting and strength enhancement of Ordinary Portland Cement (OPC) replacement with 30, 40 and 50% of Fly ash when mixed with the accelerating admixtures such as Calcium nitrate (Ca(NO3)2) and Calcium nitrate (Ca(NO3)2) combination with Triethanolamine (C6H15NO3) at temperature of 25 ± 5 °C and 58±5 % relative humidity. In early ages, the maximum compressive strength was noted for 30 % Fly ash with 1% of Ca(NO3)2 in combinations with 0.05 % of C6H15NO3 and the achieved percentages noted as 18.23% and 54.29% for 1 and 3 days. The microstructural property (SEM) was also determined for OPC replacement with 30% of Fly ash at 1 and 3 days for 1% of Ca(NO3)2 in combination with 0.05, 0.1, 0.15 and 0.2% of C6H15NO3.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41409979","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

Study on Seismic Dynamic Response and Failure Mode of Metro Station Affected by Burial Depths 埋深影响下地铁车站地震动力响应及破坏模式研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-06-01 DOI: 10.56748/ejse.182772

S Huang, Y. Peng, Y. Lyu

{"title":"Study on Seismic Dynamic Response and Failure Mode of Metro Station Affected by Burial Depths","authors":"S Huang, Y. Peng, Y. Lyu","doi":"10.56748/ejse.182772","DOIUrl":"https://doi.org/10.56748/ejse.182772","url":null,"abstract":"The metro station structure shows different failure modes when it is located at different burial depths. This re-search work is aimed to determine the influence laws of burial depths on dynamic response and failure modes of the metro station under near and far field earthquakes based on the nonlinear elastic-plastic finite element model of the metro station. The research results show that the horizontal displacements and acceleration dy-namic magnification factors of the metro station decrease and especially the internal forces increase gradually when the burial depth increases. The decreasing amplitude of the horizontal displacements and acceleration dynamic magnification factors of the metro station is reduced and the increasing amplitude of the internal forces slows down when the burial depth increases to a specific extent. Therefore, desirable anti-seismic per-formance could be achieved when a specific range of burial depth is avoided reasonably. At last, indoor shak-ing table test for metro station was done, through which we determined the initial failure position and the failure mode of the metro station under earthquake. And shaking table test results demonstrate the validation of the numerical simulation results.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45975777","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

Analysis and Evaluation Research on Road Damage of Post-Earthquake Using Generalized Information Diffusion Model 基于广义信息扩散模型的震后道路损伤分析与评价研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-06-01 DOI: 10.56748/ejse.182692

F. Wang, J. Zhang, Z. Tan, X. Ma, W. Wang

{"title":"Analysis and Evaluation Research on Road Damage of Post-Earthquake Using Generalized Information Diffusion Model","authors":"F. Wang, J. Zhang, Z. Tan, X. Ma, W. Wang","doi":"10.56748/ejse.182692","DOIUrl":"https://doi.org/10.56748/ejse.182692","url":null,"abstract":"Timely and effective estimation of road damage degree can provide scientific and reasonable support for emergency rescue. In this paper, we shall first briefly introduced a generalized information diffusion model to evaluate the damage degree of roads. Since the road earthquake loss system is influenced by many factors, which has some characters such as smaller and random sample size, the excessive features and nonlinear, etc. Based on it, several measured indicators of road damage were selected as key impacting indicators to estimate the failure grade, including the damage degree of road and bridge x1, damage degree of subgrade and pavement x2 and damage degree of roadside environment destruction on road x3. Moreover, the fuzzy diffusion and interpolation mapping for sparse data points has been defined by the fuzzy mapping theory. Next, the heterogeneous information diffusion from limited data point information to its adjacent area points was implemented. In this procedure, the fuzzy approximate reasoning and information centralization of road rupture width are also has been estimated. The numerical results show that the Generalized Information Diffusion (GID) model can reasonably approximate and extend effective information for incomplete data samples, which also can be applied to treat the nonlinear relationship between road damage degree of postearthquake.Finally, an example is given to illustrate the effectiveness and feasibility of the method.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43241593","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

Dynamic Behavior of Indonesian Bridges using Interferometric Radar Technology 利用干涉雷达技术研究印尼桥梁的动力特性

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182251

M. Maizuar, E. Lumantarna, M. Sofi, Y. Oktavianus, Lihai Zhang, C. Duffield, P. Mendis, H. Widyastuti

引用次数: 3

Health Assessment of a Pedestrian Bridge Deck using Ground Penetrating Radar 基于探地雷达的人行天桥桥面健康评估

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182261

S. Miramini, M. Sofi, A. Aseem, A. Baluwala, L. Zhang, P. Mendis, C. Duffield

引用次数: 5

Leak Detection and Quantification of Leak Size along Water Pipe using Optical Fibre Sensors Package 使用光纤传感器封装的水管泄漏检测和泄漏尺寸量化

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182281

L. Wong, R. N. Deo, S. Rathnayaka, B. Shannon, C. S. Zhang, J. Kodikara, W. K. Chiu, H. Widyastuti

引用次数: 0

Structures with Added Buckling Restrained Brace Elements 增加屈曲约束支撑元件的结构

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182231

D. Purba, I. Imran, M. Moestopo, A. Watanabe, T. Hikino, D. Siringoringo

{"title":"Structures with Added Buckling Restrained Brace Elements","authors":"D. Purba, I. Imran, M. Moestopo, A. Watanabe, T. Hikino, D. Siringoringo","doi":"10.56748/ejse.182231","DOIUrl":"https://doi.org/10.56748/ejse.182231","url":null,"abstract":"The number of high rise building has increased significantly as supporting infrastructure in many big cities in Indonesia. Most of the high rise buildings in Indonesia are constructed using reinforced concrete (r/c) moment resisting frame systems. However, due to the high seismicity of many of the regions of Indonesia, the use of moment resisting frames as single system, especially for tall buildings, are restricted. This structural system is in general quite flexible, and therefore excessive lateral drifts are experienced under seismic forces. In practice, adding buckling restrained brace (BRB) can be used to limit the lateral drift in high rise buildings. The objective of this paper is to present a study on the use of BRB elements in high rise r/c frame buildings to evaluate their seismic performance. In this paper, a 20 story office building located in a high seismicity region is modeled into two basic distinctions, i.e. building with BRB and without BRB. The adopted system of BRB is UBB (Unbonded Brace) type. The seismic response of the buildings is obtained by conducting non-linear time history analysis with seven scaled ground motions. Then, the performance of these buildings are evaluated and compared. Based on the findings, some recommendations are proposed for the use of BRB in the design of high rise r/c frame buildings located in regions with high seismicity.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43601277","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 Non-Destructive Methods: Case Studies of Marine Port and Bridges Structures in Surabaya 非破坏性方法的使用:泗水海洋港口和桥梁结构的案例研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182241

Y. Oktavianus, M. Sofi, E. Lumantarna, M. Maizuar, P. Mendis, C. Duffield, A. Rajabifard, H. Widyastuti

{"title":"Use of Non-Destructive Methods: Case Studies of Marine Port and Bridges Structures in Surabaya","authors":"Y. Oktavianus, M. Sofi, E. Lumantarna, M. Maizuar, P. Mendis, C. Duffield, A. Rajabifard, H. Widyastuti","doi":"10.56748/ejse.182241","DOIUrl":"https://doi.org/10.56748/ejse.182241","url":null,"abstract":"Consideration of degradation due to harsh environments, overweight vehicles, increasing traffic and frequent earthquake events are some of the challenges to overcome when designing reinforced concrete bridges. Structural elements can be affected by a reduction in strength and stiffness due to the carbonation of the concrete cover, the corrosion of the reinforcement, excessive cracking and displacement under service load and failure. Therefore, structures need to be monitored over time to ensure that they have the sufficient capacity to resist the intended design loads. The existing condition of bridges on toll roads and in ports located in Surabaya Indonesia has been investigated using non-destructive testing (NDT) equipment. Several reinforced concrete bridges of high level of importance have been chosen as case studies considering different exposure and age of structure. Typical results from the site investigation are presented and discussed in this paper. The NDT equipment utilised in this paper includes the use of eddy current, two-chamber vacuum cell and Wenner Probe principle to assess the thickness, the air permeability and the electrical resistivity of the concrete cover, respectively. In addition, Silver Schmidt hammer was also used to measure the compressive strength of the concrete.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44590403","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

Water Pipe Condition Assessment Using Submersible Quasi-distributed Optical Fibre based Pressure Transducers 基于水下准分布式光纤压力传感器的水管状态评估

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182291

L. Wong, R. Deo, S. Rathnayaka, B. Shannon, C. S. Zhang, J. Kodikara, W. K. Chiu, H. Widyastuti

{"title":"Water Pipe Condition Assessment Using Submersible Quasi-distributed Optical Fibre based Pressure Transducers","authors":"L. Wong, R. Deo, S. Rathnayaka, B. Shannon, C. S. Zhang, J. Kodikara, W. K. Chiu, H. Widyastuti","doi":"10.56748/ejse.182291","DOIUrl":"https://doi.org/10.56748/ejse.182291","url":null,"abstract":"Transient based technique is known as one of the most economical ways for pipeline condition assessment. This technique involves monitoring and analysing pressure transient profiles at multiple points in a distributed system. Its application is restricted due to its low spatial resolution (10 m). It is hypothesised that by increasing the number of pressure transducers and reducing the gauge length (distance between the transducers), the spatial resolution of the measurements would highly be improved. However, the deployment of pressure transducers is restricted to the location of the hydrants. In this paper, a submersible quasi-distributed optical fibre based pressure sensors were proposed, constructed and tested in laboratory to verify this concept. For this context, this paper describes the proposed optical device and presents some preliminary analysis and results obtained from a set of experiments. The experimental results show that using the quasi-distributed optical fibre based pressure transducers for pressure transient analysis can potentially detect small anomalies (200 mm) and measure the growth of the anomalies along a water pipe.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47763214","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

Prediction of Railway Vehicles’ Dynamic Behavior with Machine Learning Algorithms 基于机器学习算法的铁路车辆动态行为预测

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2018-01-01 DOI: 10.56748/ejse.182271

N. Nadarajah, A. Shamdani, G. Hardie, W.K.Chiu, H. Widyastuti

{"title":"Prediction of Railway Vehicles’ Dynamic Behavior with Machine Learning Algorithms","authors":"N. Nadarajah, A. Shamdani, G. Hardie, W.K.Chiu, H. Widyastuti","doi":"10.56748/ejse.182271","DOIUrl":"https://doi.org/10.56748/ejse.182271","url":null,"abstract":"The dynamic performance of railway vehicles needs to be carefully monitored to ensure their safe operation. Presently a number of systems such as the Vehicle Track Interaction Monitor and the Instrumented Revenue Vehicles, utilize a number of on-board inertial sensors to obtain near-real time information on the dynamic performance of railway vehicles. These systems provide rich data sets that give an indication of the underlying track condition and the corresponding dynamic response. This paper outlines the use of Machine learning to develop dynamic behavior predictive models for railway vehicles from measured data. This study worked on the development of 2 types of predictive models, viz. regression and classification model. The regression model predicted the time series dynamic response amplitude and the classification model classified the track sections based on the response distribution over it. Train speed and parameters estimated from the unsprung mass were used as predictors in the model. After the trial of a number of predictive models the Ensemble Tree Bagger method was found to have highest overall prediction accuracy. These predictive models can be utilized as a decision making tool to determine safe operational limits and prioritize maintenance interventions.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45310281","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