Proceedings of the Institution of Civil Engineers-Structures and Buildings最新文献_第7页

Withdrawal behaviour of mechanical fasteners on laminated bamboo lumber 层压竹材上机械紧固件的回撤性能

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-10-10 DOI: 10.1680/jstbu.22.00118

Guo Chen, Enhao Zhang, Di Wu, Chang Wang, Tong Zhou

{"title":"Withdrawal behaviour of mechanical fasteners on laminated bamboo lumber","authors":"Guo Chen, Enhao Zhang, Di Wu, Chang Wang, Tong Zhou","doi":"10.1680/jstbu.22.00118","DOIUrl":"https://doi.org/10.1680/jstbu.22.00118","url":null,"abstract":"Experiments on connections were done to evaluate the effect of shank diameter, shank type, penetration depth, and insertion direction on the nail-holding behaviour of laminated bamboo lumber (LBL). It is found that shank type of fasteners has significant effect on failure modes. Nails were pulled out directly from the LBL without other visible damage due to smooth shank, while the bamboo fibers around the screws were tore under the action of screw thread. The load-slip curves of specimens are linear up to the maximum load and relative slip between the fasteners and LBL is small at this stage. However, the post-peak performance of nails and screws varies significantly on the descending portion of the curves. The specimens with nails inserted parallel to grain have the lowest withdrawal capacity, followed by those of the tangential and radial directions. As expected, the withdrawal capacity of the specimens increases linearly with the increase of the embedment depth and shank diameter. The measured load-slip curves were recorded and compared with the existing theoretical models. Results show that the Yuan and Ling model can be used to predict the load-slip relationship of the withdrawal behaviour of nails and screws in LBL respectively.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"77 3 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89277096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Failure contingency assessment of corroded beams based on structural parameters 基于结构参数的腐蚀梁破坏偶然性评估

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-10-10 DOI: 10.1680/jstbu.22.00047

Masoumeh Taghipour, M. Dehestani

引用次数: 0

Flexural Strengthening of Reinforced Concrete Beam Bonded with Built-in T Type BFRP Plate 内置T型BFRP板粘结钢筋混凝土梁的抗弯加固

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-25 DOI: 10.1680/jstbu.22.00026

Buntheng Chhorn, Viriyavudh Sim, Sangmoon Lee, WooYoung Jung

{"title":"Flexural Strengthening of Reinforced Concrete Beam Bonded with Built-in T Type BFRP Plate","authors":"Buntheng Chhorn, Viriyavudh Sim, Sangmoon Lee, WooYoung Jung","doi":"10.1680/jstbu.22.00026","DOIUrl":"https://doi.org/10.1680/jstbu.22.00026","url":null,"abstract":"Recently, Basalt Fiber Reinforced Polymer (BFRP) is expected to be a new excellent material for repair and rehabilitation of civil infrastructure due to its benefit of sound mechanical properties, high corrosion resistant, and low cost. However, studies investigating RC beam externally strengthened with BFRP are still limited in the literature. The objective of this study is to determine the effect of BFRP strengthening on flexural performance of RC beam. Four RC beams with rectangular cross section were produced and strengthened using different BFRP reinforcement techniques and tested under four-point bending until failure. The failure mode, crack width, number of cracks, load-deflection response curves, and ductility of overall beam system were recorded and analyzed. Experimental results showed that the stiffness and the ultimate capacity of the strengthened beam were increased 8%-23% and 14%-30%, respectively, over the control beam. To predict load-carrying capacity and deflection of tested specimens, three-dimension finite element (FE) modeling was performed using ABAQUS software to simulate the behavior of the RC beam strengthened with FRP plates. Prediction with the FE model matched well with experimental results in terms of mid-span deflection and load-carrying capacity.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"11 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74516432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimal location of acoustic emission sensors for detecting rail damage 轨损声发射传感器的优化定位

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-25 DOI: 10.1680/jstbu.21.00074

Tamal Kundu, A. Datta, P. Topdar, S. Sengupta

引用次数: 4

Flexural behaviour of hollow reinforced concrete-filled fibreglass tubular beams 空心钢筋混凝土填充玻璃纤维管梁的受弯性能

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-23 DOI: 10.1680/jstbu.21.00128

Xue Li, Lian-guang Wang, Yao-sheng Zhang, Ni Zhang

{"title":"Flexural behaviour of hollow reinforced concrete-filled fibreglass tubular beams","authors":"Xue Li, Lian-guang Wang, Yao-sheng Zhang, Ni Zhang","doi":"10.1680/jstbu.21.00128","DOIUrl":"https://doi.org/10.1680/jstbu.21.00128","url":null,"abstract":"An experimental and numerical study of the hollow reinforced concrete-filled glass-fibre- reinforced-polymer tubular beams was carried out. Based on the bending tests, the working mechanism and failure modes were studied. A finite-element model was established and the validity was assessed by comparing the experimental and numerical results. The main parameters included the wall thickness of fibreglass tube, the reinforcement ratio, the hollow ratio, the concrete strength and the fibre winding angle. The results indicated that the composite beams failed gradually with considerable ductility. The bending capacity increased by about 12% with every 1 mm increment of the fibreglass tube thickness; increased about 40% as the reinforcement ratio increasing from 2.28% to 4.56%; and increased about 6% with every 5 MPa increment of the concrete strength. The bending capacity decreased and then increased as the fibre winding angles ranging from 10° to 90°, and small fibre winding angle was preferable for the flexural member. The hollow ratio of 0.375 is proved to be applicable to obtain lighter member self-weight with minimal strength decrease.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"42 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79117973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of considering substructures on seismic performances of suspen-dome structure 考虑子结构对悬架-穹顶结构抗震性能的影响

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-12 DOI: 10.1680/jstbu.21.00187

Zetao Zhao, X. Li, Renjie Liu, Suduo Xue, Tifeng Liu, Qinxin Fan, Hui Jing, Majid Dezhkam

{"title":"Influence of considering substructures on seismic performances of suspen-dome structure","authors":"Zetao Zhao, X. Li, Renjie Liu, Suduo Xue, Tifeng Liu, Qinxin Fan, Hui Jing, Majid Dezhkam","doi":"10.1680/jstbu.21.00187","DOIUrl":"https://doi.org/10.1680/jstbu.21.00187","url":null,"abstract":"In order to investigate the influence of substructures on the seismic performance of the suspen-dome structure, taking the suspen-dome roof structure of the Lanzhou Olympic Sports Center Complex as the prototype, a method that replaces complex concrete substructures of the prototype structure with steel substructures in shaking table test was proposed and a scale model considering substructures was established. Firstly, the natural frequencies of the test model were compared with the modal analysis results of the prototype structure considering the scale ratio. After that, an integral numerical model considering substructures was established by ABAQUS, the results of modal analysis and dynamic time history analysis were compared with the test results. Finally, two simplified numerical models with boundary conditions of fixed bearings and three-directional hinged bearings were established. The seismic performances of simplified models and the integral model were compared. It is observed that the method of considering complex concrete substructures of the prototype structure in the shaking table test is accurate and effective. Besides, the numerical model and the modeling method are correct. Moreover, the substructure has a significant impact on the seismic performance of the suspen-dome. The substructure should be considered in the analysis and design stages.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"166 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80474142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seismic performance of a ring beam connecting filled-tube columns with concrete frames 钢管柱与混凝土框架连接环梁的抗震性能

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-12 DOI: 10.1680/jstbu.21.00173

K. Dai, Qianqian Li, Jianze Wang, Zhenhua Huang

{"title":"Seismic performance of a ring beam connecting filled-tube columns with concrete frames","authors":"K. Dai, Qianqian Li, Jianze Wang, Zhenhua Huang","doi":"10.1680/jstbu.21.00173","DOIUrl":"https://doi.org/10.1680/jstbu.21.00173","url":null,"abstract":"The seismic performance of a ring-beam connection system that integrates concrete-filled steel tubular columns and reinforced concrete frames was studied. Physical experiments on two fabricated specimens were conducted under monotonic and cyclic loading. The results showed the connection system had a displacement ductility ratio of 4.68 and an energy dissipation coefficient over 2.0. A finite-element model was established and the numerical and experimental results were compared in terms of skeleton curve and stiffness degradation trend. Parametric studies were then performed to evaluate the effects of axial compressive force ratio, concrete strength and reinforcement ratio for the ring-beam joint, and reinforcement ratio for the frame beam, on the seismic performance of the proposed connection system. The results indicated that the increase in the axial compression ratio or strength of the concrete material would improve the initial stiffness and strength of the connection system. However, the effect of the ring-beam joint reinforcement ratio and frame beam reinforcement ratio of the connection system on the seismic performance was negligible.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"67 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77825166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Earthquake repair of a single-column continuous-beam bridge with polyurethane cement 聚氨酯水泥单柱连续梁桥抗震修复

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-12 DOI: 10.1680/jstbu.21.00167

Haoyang Zhang, Quansheng Sun, Hongxiang Xia, Dezhang Sun, Yong Huang

引用次数: 0

Study on thermodynamic properties of RC beams considering elevated temperature and spalling effect 考虑高温和剥落效应的RC梁热力学性能研究

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-08-12 DOI: 10.1680/jstbu.21.00201

Chaofeng Liu, B. Zhou, Qianqian Liu, Cai‐wei Liu, Lingui Wang, Fei Xing

{"title":"Study on thermodynamic properties of RC beams considering elevated temperature and spalling effect","authors":"Chaofeng Liu, B. Zhou, Qianqian Liu, Cai‐wei Liu, Lingui Wang, Fei Xing","doi":"10.1680/jstbu.21.00201","DOIUrl":"https://doi.org/10.1680/jstbu.21.00201","url":null,"abstract":"In order to study the effect of high temperatures on the thermomechanical properties of RC beams, fire and mechanical tests were carried out on four fully-dimensioned simply supported beams. A numerical analysis model based on the measured information was developed, and it was validated through experimental tests and theoretical calculations. The effects of fire exposure time, different physical parameters and concrete spalling parameters on the thermodynamic properties were further analyzed. The results show that the measured vibration frequencies appear a fluctuating trend of decay with increasing fire exposure time. The simulated frequency decays as a power function of fire exposure time. The frequency decreases with increasing span-to-height ratio and increases with section width, elasticity modulus of concrete and reinforcement ratio, respectively. Cross-sectional temperature field is most significantly affected by spalling depth, which increases rapidly with its increasing. With the increase in spalling area ratio, the increase in the temperature field gradually becomes smaller. The effect of spalling area ratio was relatively stable after more than 15%. The flexural bearing capacity shows a linear decrease trend with the increase in spalling depth. With the increase in spalling area ratio, it shows a power function of the decreasing trend.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"192 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79673008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analytical and Numerical Study of Fire-Damaged Circular Concrete Columns Repaired Using Composite Confinement Techniques 火灾损伤圆形混凝土柱复合约束修复的分析与数值研究

IF 1.6 4区工程技术

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2022-05-24 DOI: 10.1680/jstbu.21.00017

Iqrar Hussain, M. Yaqub, M. Mortazavi, Muhammad Adeel Ehsan, Mudasir Hussain

{"title":"Analytical and Numerical Study of Fire-Damaged Circular Concrete Columns Repaired Using Composite Confinement Techniques","authors":"Iqrar Hussain, M. Yaqub, M. Mortazavi, Muhammad Adeel Ehsan, Mudasir Hussain","doi":"10.1680/jstbu.21.00017","DOIUrl":"https://doi.org/10.1680/jstbu.21.00017","url":null,"abstract":"This paper presents numerical and regression modeling of 21 undamaged, fire-damaged, and repaired fire-damaged reinforced circular concrete (RC) columns. The columns were exposed to three different temperatures of 300°C, 500°C, and 900°C and tested for axial residual capacity. It was found that concrete loses its strength after exposure to a temperature of 300°C or above. Fire-damaged columns were then repaired using various composite confinement techniques. Strength was regained when CFRP confinement was applied to fire-damaged columns but it increased the deformation as well and thus reduced the stiffness which is not desirable. To overcome this challenge, steel wire mesh, filled with cement sand mortar and wrapped with CFRP was employed. Further, a numerical model was developed that could precisely predict the residual capacity of these columns. The paper briefly reviewed and summarised the development of numerical techniques, including material properties, geometry, elements, loading, boundary conditions, and contact algorithm for undamaged, fire-damaged, and repaired fire-damaged columns. Moreover, analytical equations were developed using linear, multiple, and quadratic regression modeling. The results obtained using the proposed model and regression equations showed that these models offered a better alternative to the experimental testing for the prediction of the post-fire performance of damaged and repaired RC columns.","PeriodicalId":54570,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Structures and Buildings","volume":"31 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81897578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0