Electronic Journal of Structural Engineering最新文献

Evaluation of the dynamic additional impact about foundation pit construction on the existing adjacent subway station with the PBA method 采用 PBA 方法评估基坑施工对邻近现有地铁站的动态额外影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-12-13 DOI: 10.56748/ejse.23525

Lijun Wang, Yongxing Dai, Zekun Chen, Huijian Zhang, Gongning Liu

{"title":"Evaluation of the dynamic additional impact about foundation pit construction on the existing adjacent subway station with the PBA method","authors":"Lijun Wang, Yongxing Dai, Zekun Chen, Huijian Zhang, Gongning Liu","doi":"10.56748/ejse.23525","DOIUrl":"https://doi.org/10.56748/ejse.23525","url":null,"abstract":"In this paper, relying on the Tianhe East Station project of Guangzhou Subway Line 11, the deformation and mechanical evolution rules about the existing adjacent stations with the pile-beam-arch (PBA) method in the all excavation stages about the new foundation pit is evaluated through numerical calculation method. It was revealed that that the largest displacement about the existing station’s side wall and the middle column reaches 2.1mm and 1.5mm respectively during the excavation about the foundation pit. Due to the impact about construction of the foundation pit, the uplifting phenomenon occurs on the side of the foundation pit, and the maximum uplifting value reaches 0.4mm. When the construction about foundation pit is finished, the whole station floor shows a deformation form of “left lower torsion”, and the largest compressive stresses as well as tensile stresses about the side wall and the bottom plate do not reach the standard limiting value, and the whole is being a relative safe status. With the increase about the excavation depths, the axial forces about the middle column gradually increase to 7016kN, and the incremental axial forces about the middle column after the construction is completed accounts for about 11.7% of the axial force of initial construction. Therefore, the disturbance effect about foundation pit construction on the adjacent station with the PBA method can not be ignored. The research result in this paper may offer some important references for the construction and design of similar cases.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"51 6","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139005094","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

Seismic Assessment of High-Rise Buildings Having Transfer Elements 具有传递单元的高层建筑抗震评价

Electronic Journal of Structural Engineering Pub Date : 2023-11-12 DOI: 10.56748/ejse.23433

El-Sayed Z. El-Bayome, Ahmed M. Abd El-Salam, Osama O. El-Mahdy, Hala.M Refaat

引用次数: 0

Ultra-High-Performance Concrete (UHPC): A state-of-the-art review of material behavior, structural applications and future 超高性能混凝土(UHPC):材料性能、结构应用和未来的最新综述

Electronic Journal of Structural Engineering Pub Date : 2023-11-12 DOI: 10.56748/ejse.23426

Srimaruthi Jonnalagadda, Srinivas Chava

{"title":"Ultra-High-Performance Concrete (UHPC): A state-of-the-art review of material behavior, structural applications and future","authors":"Srimaruthi Jonnalagadda, Srinivas Chava","doi":"10.56748/ejse.23426","DOIUrl":"https://doi.org/10.56748/ejse.23426","url":null,"abstract":"Ultra-high-performance concrete commonly known as UHPC is rising curiosity among structural engineers all over. Though early research on this material dates back to a couple of decades, some initial knowledge about this material, its behavior, and its properties is largely limited to a few research circles in a handful of advanced countries. This paper introduces UHPC as a material, elaborates on its ingredients, and describes its properties. A detailed review of available research literature about UHPC is made. The contributions made by several researchers have been discussed in detail. Following this, the structural behavior and strength of the material are reviewed comprehensively. Comparisons are made between conventional concrete and UHPC with respect to their properties, stress-strain relation, cracking behavior, compressive, tensile, and shear strengths. A detailed evaluation is made of the enhanced properties of the material with respect to its durability and long-term performance. The resistance of this material to moisture permeability, chloride ingress, and chemical attacks is understood. The impact resistance and energy absorption characteristics of the material are compared with conventional concrete. The study documented the structural applications of UHPC as well as the potential applications in the field of civil engineering. Finally, the authors enlisted the impacts of this new material (UHPC) on the future direction of structural engineering and the innovative solutions it can provide to structural engineering problems","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"58 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135037253","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

Assessment of uncertainties in damping reduction factors using ANN for acceleration, velocity and displacement spectra 用人工神经网络评估加速度、速度和位移谱中阻尼减减因子的不确定性

Electronic Journal of Structural Engineering Pub Date : 2023-10-15 DOI: 10.56748/ejse.23395

Abdelmalek Abdelhamid, Baizid Benahmed, Mehmet Palanci, Lakhdar Aidaoui

{"title":"Assessment of uncertainties in damping reduction factors using ANN for acceleration, velocity and displacement spectra","authors":"Abdelmalek Abdelhamid, Baizid Benahmed, Mehmet Palanci, Lakhdar Aidaoui","doi":"10.56748/ejse.23395","DOIUrl":"https://doi.org/10.56748/ejse.23395","url":null,"abstract":"Structure's damping force during an earthquake is very different from what was anticipated during design. This adds uncertainty to the process of designing structures exposed to seismic loads which may be a major cause of significant variation in the seismic response reliability of these structures. This work is focused on the investigation of the structural damping uncertainties effect on the structure’s response spectra through the assessment of uncertainties in the damping reduction factors (DRF) derived from the acceleration, velocity and displacement spectra. An Artificial Neural Networks (ANN) was also developed for the stochastic DRF calculation. The Monte Carlo method, one of the methods of computational algorithms that rely on repeated random sampling to obtain numerical results, is used for the estimation of the stochastic DRF. The obtained results indicates that the difference between the deterministic and the stochastic DRF are around of 21 % for displacement and velocity and 28.7 % for acceleration spectra. As a consequence, the DRF derived from the acceleration spectra is more sensible to the uncertainties inherent on damping than the DRF obtained from displacement and velocity. Therefore, it is important to take this conclusion into account when using these factors previously. The ANN constitutes a sample and efficiency method to predict the stochastic DRF since the error obtained is always less than 6 %. Practice oriented results are searched for, to be incorporated in future seismic standards.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136185865","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

Effects of Structural Bracing on the Progressive Collapse Occurrence 结构支撑对连续倒塌发生的影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-09-05 DOI: 10.56748/ejse.23448

Emad Raminfar, Ardavan Izadi

{"title":"Effects of Structural Bracing on the Progressive Collapse Occurrence","authors":"Emad Raminfar, Ardavan Izadi","doi":"10.56748/ejse.23448","DOIUrl":"https://doi.org/10.56748/ejse.23448","url":null,"abstract":"Statistics of human losses and financial casualties induced progressive collapse, as one of the new and modern concepts in the field of civil engineering, have doubled the importance of having knowledge about this phenomenon and strategies to reduce its effect. Progressive collapse starts with a local failure with loss of local load-carrying capacity of a small portion of the structure and spreads throughout the structure from element to element. These consecutive failures may cause the collapse of either the entire structure or a major part of it. This paper studies the effect of adding a bracing system to the steel moment frames designed for seismic loads through a nonlinear dynamic method according to GSA-2003 and UFC-4-023-03 criteria. The study was conducted using computational simulation of building models with two different elevations of three and six floors located in a moderate seismicity region. The simulation results showed higher resistance against the progressive collapse of the structure in the braced steel moment frames and less sensitivity to the removal of the column in the braced spans in comparison to the spans without bracing. The prediction of possible progressive collapse in the UFC-4-023-03 criterion is more conservative than the GSA-2003 criterion. Although, generally there is no significant difference between the analysis results of these two criteria.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45660042","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

Parameters Affect Flexural Mechanism to Prevent Progressive Collapse of RC Buildings 参数对钢筋混凝土建筑抗弯机理的影响

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-07-25 DOI: 10.56748/ejse.234403

Z. Najem, Thaer Alrudaini

{"title":"Parameters Affect Flexural Mechanism to Prevent Progressive Collapse of RC Buildings","authors":"Z. Najem, Thaer Alrudaini","doi":"10.56748/ejse.234403","DOIUrl":"https://doi.org/10.56748/ejse.234403","url":null,"abstract":"This study investigates the effect of spans length, reinforcement ratio and continuity of flexural reinforcement on the progressive collapse performance of double span beams over failed columns. The investigations focus on initial flexural resisting mechanism to prevent the progressive collapse. Detailed nonlinear finite element simulation of double span beam-column sub-assemblages subjected to residual gravity loads that initially carried by the failed column is adopted for the investigations. Nonlinear static pushover analysis is conducted in which capacity curves are derived and compared with demanded capacities. The effect of spans length, reinforcement ratio and number of continuous bottom flexural reinforcement on progressive collapse are considered in the investigations. Analysis results show that the strength to resist progressive collapse has decreased by 25.4 % and the ductility increased by 103 % following the increasing in span length from 5 m to 7 m. On the other hand, increasing reinforcement ratio of top flexural reinforcement from 0.447 to 1.089 leads to 26.27 % increasing in strength accompanied with a decrease in ductility equal to 16.42 %. In addition, extending all bottom bars rather than the minimum specified two bars resulted in 12 % increasing in strength and 40.28 % decreasing in ductility.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43533409","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 response analysis of the process of the utility shield tunnel under-passing the operating subway tunnel 盾构隧道通过运营地铁隧道过程的动力响应分析

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-07-25 DOI: 10.56748/ejse.234433

Jingyao Sun, Xingkai Pei, Cheng Yang, Binzhong Zhu

{"title":"Dynamic response analysis of the process of the utility shield tunnel under-passing the operating subway tunnel","authors":"Jingyao Sun, Xingkai Pei, Cheng Yang, Binzhong Zhu","doi":"10.56748/ejse.234433","DOIUrl":"https://doi.org/10.56748/ejse.234433","url":null,"abstract":"In order to analyze the interaction between the operating subway tunnel and the utility tunnel under construction during the utility tunnel under-passing the subway tunnel, an operating tunnel-stratum-utility shield tunnel coupled dynamic calculation model is established taking the utility tunnel under construction under-passing the Guangzhou-Foshan line subway project as an example. And the interaction between the existing tunnel and utility tunnel was studied. The results show that the amplitude change of the vertical displacement, acceleration and additional vertical stress are most influenced by the under-passing shield tunnel when the train operating on one line, and the max changes are 0.01 mm, 0.03m/s2 and 1.5kPa, respectively. The vertical displacement and acceleration response generated by the train operation during the excavation of the new tunnel can be neglected, but the vertical additional stress will have the max change of 2.1kPa. The closer the distance between the train load to the new and old tunnel structures are, the greater the displacement, acceleration and additional stresses of the new and old tunnel structures are when the trains are running in different lines. Structural safety calculations show that the old and new tunnel structures are safe during the utility shield tunnel under-passing. The study can provide useful reference for the construction and operation of similar tunnels.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47939694","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

Nonlinear finite element Analysis of laterally loaded piles in Layered Soils 层状土中横向荷载桩的非线性有限元分析

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-07-25 DOI: 10.56748/ejse.234003

Haitham Saeed, Huda Saad Abed

引用次数: 0

Study of dynamic impact factors of two-track continuous and integral railway bridge subjected to high-speed loads 高速荷载作用下双线连续整体铁路桥梁动力影响因素研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-07-25 DOI: 10.56748/ejse.234203

Anand M. Gharad, Ranjan S. Sonparote

引用次数: 0

Numerical Study on the Various Profile Sections of Concrete Filled Steel Tubular Columns Under Compression 钢管混凝土受压柱不同截面的数值研究

IF 0.6

Electronic Journal of Structural Engineering Pub Date : 2023-07-25 DOI: 10.56748/ejse.234083

Vinay Singh, Pramod Kumar Gupta, S. M. Ali Jawaid

{"title":"Numerical Study on the Various Profile Sections of Concrete Filled Steel Tubular Columns Under Compression","authors":"Vinay Singh, Pramod Kumar Gupta, S. M. Ali Jawaid","doi":"10.56748/ejse.234083","DOIUrl":"https://doi.org/10.56748/ejse.234083","url":null,"abstract":"The axial load-carrying capacity for a wide range of short concrete-filled steel tubular (CFST) members having different section profiles is evaluated in the presented work. A numerical study has been carried out through Finite-Element based demonstration and it has been accomplished in the ABAQUS package for relevancy of analytically predicted axial load carrying capacity by unified formula as suggested by Yu M. et al. (2010). To validate the results from the unified formula and the experimentally available literature, finite element-based models for hollow and solid sections of CFST columns with circular, octagonal, and square section profiles have been generated. A total of 31 hollow and 24 solid circular columns, 9 hollow, and 9 solid octagonal columns, and in the last 9 hollows and 38 solid square CFST columns are examined for the persistence of the results. After evaluation of obtained results from the modeling existing results are validated, and it is found that the proposed unified formula predicts satisfactory results when compared with the result of established models. Further, it is concluded that displacement in the direction of applied load is not uniform throughout the length of CFST columns thereby using the ring confinement technique for the region of applied force may be reasonable.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48936780","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