Electronic Journal of Structural Engineering最新文献_第7页

Experimental investigation of high temperature effect on Slag based alkali activated concrete and ordinary concrete 高温对渣基碱活化混凝土和普通混凝土影响的试验研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2020-06-01 DOI: 10.56748/ejse.20242

S. Thakkar, U. Dave, Jay Patel

引用次数: 0

Survival of Reinforced Concrete Flat Plate System against Column Loss 钢筋混凝土平板体系抗柱损失的生存

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2020-06-01 DOI: 10.56748/ejse.20244

Waleed E. El-Demerdash, Salah El-Din E. El-Metwally, Mohamed E. El-Zoughiby

{"title":"Survival of Reinforced Concrete Flat Plate System against Column Loss","authors":"Waleed E. El-Demerdash, Salah El-Din E. El-Metwally, Mohamed E. El-Zoughiby","doi":"10.56748/ejse.20244","DOIUrl":"https://doi.org/10.56748/ejse.20244","url":null,"abstract":"Column loss in a flat plate building, due to punching shear, explosion, impact load or any acci-dental event, can lead to what is termed progressive collapse. Progressive collapse is inherently a dynamic process, which makes it difficult to experimentally explore structures with real scale. Therefore, this paper aims to numerically investigate the behavior of flat plate systems due to column loss utilizing nonlinear finite element analysis with the aid of the computer software (ABAQUS). In this investigation, the nonlinear dynamic re-sponse of both an old flat plate building, designed according to the ACI 318-71, and a similar modern building, designed according the ACI 318-14, subjected to an instant removal of a column is examined. The obtained results clearly reveal that the old flat plate building without continuous slab bottom reinforcement at columns is highly vulnerable to progressive collapse and the efficiency of the continuous bottom reinforcement within the column strip, as recommended by the ACI 318-14, in preventing the disproportion or progressive collapse of a reinforced concrete flat plate building. Such reinforcement is able to produce alternate load path through the tensile membrane action, thus providing ductility and robustness in the system.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44029567","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

Structural Optimization for Asymmetric Framed Structures without Shear Walls 无剪力墙非对称框架结构的结构优化

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2020-06-01 DOI: 10.56748/ejse.20245

Walls, Anandu Sreeraj, B. Sunil

引用次数: 0

Stochastic Finite Fault Modeling and Simulation of Strong Ground Motion of Mosha Fault in Iran 伊朗Mosha断层强震随机有限断层建模与模拟

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2020-06-01 DOI: 10.56748/ejse.20247

H. Saffari, A. Roohafzayan, A. Mahdavian, M. Yari

{"title":"Stochastic Finite Fault Modeling and Simulation of Strong Ground Motion of Mosha Fault in Iran","authors":"H. Saffari, A. Roohafzayan, A. Mahdavian, M. Yari","doi":"10.56748/ejse.20247","DOIUrl":"https://doi.org/10.56748/ejse.20247","url":null,"abstract":"This study aims at predicting large earthquakes caused by Mosha fault in Tehran, the capital of Iran with population of more than 13 million people which located alongside active faults. This study uses the EXSIM program to do the finite fault modeling of simulation. Using Geopsy software and programming in MATLAB we evaluated the site effect of 13 station. Using other required parameters of Mosha fault in EXSIM, we gained the artificial strong motions of the stations. Finally, using SeismoSignal and MATLAB software, we depicted the Acceleration -time graph and the semi-logarithm frequency spectrum with “Fourier transform” of each station. we compared the results of the finite fault simulation with Ambraseys attenuation relationship, semi-logarithm frequency spectrum with Fourier transform and spectrum-response graphs of 2009 earthquake in Shahr-e Rey measuring Mw = 4.2. In both cases of comparing meaningful results were found. Finally, in order to generalize the results to the city of Tehran, we evaluated the seismicity using Arc GIS software. The results show that if Mosha fault is activated, east of Tehran is influenced the most. Consequently, it is of high importance to study different ways to reduce the risk of the possible earthquake caused by Mosha fault.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49049678","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

Analytical and Numerical Models of Steel I-Section Beam-Columns Strengthened with Bonded Prestressed FRP Laminates 有粘结预应力FRP层板加固工字钢梁柱的分析与数值模型

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19230

E.Y. Sayed-Ahmed, A.T. Abdelrazik

{"title":"Analytical and Numerical Models of Steel I-Section Beam-Columns Strengthened with Bonded Prestressed FRP Laminates","authors":"E.Y. Sayed-Ahmed, A.T. Abdelrazik","doi":"10.56748/ejse.19230","DOIUrl":"https://doi.org/10.56748/ejse.19230","url":null,"abstract":"Fibre Reinforced Polymer (FRP) laminate are currently used in strengthening steel structures having a significant favorable effect on the member capacity. Researches have been focused on FRP strength-ened beams or columns; thus, I-section beam-columns strengthened with prestressed bonded FRP laminate are scrutinized. Steel yielding, laminate rupture and/or laminate interfacial debonding common failure modes af-fecting the strengthened beam-columns capacity: debonding commonly leads to a premature failure. Prestress-ing the FRP laminate may delay this premature failure. Equations are analytically developed to evaluate the interfacial shear and normal stresses between the laminate and the steel; hence, the maximum stresses at debond-ing are evaluated. Thus, the capacity of a beam-column with prestressed FRP laminate is analytically estimated. A nonlinear numerical model is then developed for these beam-columns. The model is verified against exper-imental results available from literature. Then, a parametric study is conducted using the numerical model. Based on these results, a regression analysis is performed and the capacity of beam-columns with prestressed FRP laminate is numerically estimated considering steel yielding or FRP laminate rupture. Results of the nu-merical and analytical models lead to a proposal for evaluating the FRP strengthened beam-column capacity and the need for prestressing the FRP laminate.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41452375","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

Proposed SMA Tension Sling Damper for Passive Seismic Control of Building 用于建筑物被动抗震控制的SMA张拉吊索阻尼器

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19235

S. H. Mehta, S. P. Purohit

{"title":"Proposed SMA Tension Sling Damper for Passive Seismic Control of Building","authors":"S. H. Mehta, S. P. Purohit","doi":"10.56748/ejse.19235","DOIUrl":"https://doi.org/10.56748/ejse.19235","url":null,"abstract":"Passive Shape Memory Alloy (SMA) based Tension Sling Damper (TSD) is proposed to control seismic response of building represented as dynamic SDOF system. Non-linear hysteretic behavior of SMA is characterized by Tanaka model with seismic excitations as input. It is converted to equivalent piece-wise linear elastic viscous damping model described by stiffness constant ‘keff’ and damping constant ‘ceff’ to implement it with linear dynamic system. Damping constant ‘ceff’ is evaluated for TSD for given seismic excitation at each instance of time defined as instantaneous damping, unlike constant damping used in other studies, to derive accurate seismic response of the dynamic system. Seismic response control parameters – peak and rms perfor-mance indices (PI) for displacement and acceleration, peak damper force, maximum damping ratio are evalu-ated for flexible, moderately stiff and stiff dynamic systems fitted with TSD under pulse and strong ground motion type seismic excitations with varied PGA. Substantial reduction in PI is observed for controlled systems through varying design parameters of TSD – cross-sectional area and length of SMA sling. TSD yields better seismic response control for moderately stiff and flexible system due to super-elastic properties of SMA. Fur-ther, it works efficiently for seismic excitations with low to moderate PGA.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41412507","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

Behavior of Castellated Steel Beams: State of the Art Review 城堡式钢梁的性能:最新技术评论

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19234

Samadhan G. Morkhade, Laxmikant M. Gupta

引用次数: 6

Dynamic Analysis of Elevated Water Tanks 高架水箱的动力分析

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19233

Damini J. Dhondge, R. S. Talikoti

引用次数: 0

Review of techniques for identifying the chemical composition of Aluminium Composite Cladding cores 铝复合材料包层芯化学成分鉴定技术综述

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19231

T. Byrnes, L. Angel, K. Hunt, T. Flynn

引用次数: 1

Utilizing Steel Brace for Seismic Retrofitting of Old School Buildings with Open Ground Storey 利用钢支撑对露天老校舍进行抗震加固

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2019-12-01 DOI: 10.56748/ejse.19236

T. Sharaf, O. M. Ramadan, S. Elshazly

{"title":"Utilizing Steel Brace for Seismic Retrofitting of Old School Buildings with Open Ground Storey","authors":"T. Sharaf, O. M. Ramadan, S. Elshazly","doi":"10.56748/ejse.19236","DOIUrl":"https://doi.org/10.56748/ejse.19236","url":null,"abstract":"This paper investigates the seismic performance of an old school building with open ground storey. The building was designed according to an old Egyptian design code that did not consider the earthquake load; thus, the building is vulnerable to sudden lack of stiffness in the open ground storey (soft storey effect). The first check showed that the building is unable to resist the loads from earthquakes in both longitudinal and transverse directions. Therefore, two retrofitting options were suggested and investigated: using steel bracings; and changing the thickness of some ground floor infill walls. Pushover analyses were conducted to evaluate the building seismic performance. For these analyses, the FEA was applied considering both material and geometric nonlinearities. Both retrofitting methods helped to make the building capable to resist the earthquake loads according to the current Egyptian codes. In particular, retrofitting increased the lateral resistance by up to 55% and 25% in longitudinal and transverse directions, respectively. The research findings facilitate an economical and practical upgrading of many old school buildings without violating their function. Based on authors’ expe-rience, there are hundreds of such school buildings in Egypt alone.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45524252","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