Structural Concrete最新文献_第10页

Study on seismic performance of reinforced concrete shear wall with diagonally distributed reinforcement 斜向分布钢筋的钢筋混凝土剪力墙抗震性能研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-31 DOI: 10.1002/suco.202400391

Yan Gao, Yushan Wang, Wenxing Zhu, Haifeng Wang, Huan Liao, Di Xiao, Ziyang Zhang

{"title":"Study on seismic performance of reinforced concrete shear wall with diagonally distributed reinforcement","authors":"Yan Gao, Yushan Wang, Wenxing Zhu, Haifeng Wang, Huan Liao, Di Xiao, Ziyang Zhang","doi":"10.1002/suco.202400391","DOIUrl":"https://doi.org/10.1002/suco.202400391","url":null,"abstract":"Reinforced concrete shear walls in multistory buildings often undergo the combined action of vertical and horizontal loads, with their failure primarily attributed to localized damage of the concrete at the bottom of edge elements, leading to premature loss of wall functionality. To enhance the performance of shear walls, this study explores the optimization of shear wall design from the perspective of the stress path within the wall, introducing a diagonally distributed reinforcements in shear walls (referred to as DDR shear walls). To investigate the seismic performance of DDR shear walls, we consider the effects of axial compression ratio, the inclination angle of distributed reinforcing bars, reinforcing bar spacing, and shear span ratio. We design 27 shear wall models with various parameter combinations and employ ABAQUS finite element analysis software to simulate the seismic performance. The simulation results reveal that the inclined distribution of reinforcing bars significantly enhances the seismic performance of shear walls. To achieve optimal structural performance, the inclination angle of reinforcing bars should be adjusted for different floor levels, with higher floors requiring a greater angle and lower floors a smaller one. Additionally, increasing the reinforcing bar spacing and altering the shear span ratio will have varying degrees of impact on the seismic performance of shear walls, necessitating rational design adjustments based on specific circumstances. Furthermore, the application of DDR shear walls in prefabricated construction can be considered to optimize construction processes.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"41 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Torsional behavior of composite shear walls and load‐bearing sandwich panels: An experimental investigation 复合剪力墙和承重夹芯板的扭转行为：实验研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-31 DOI: 10.1002/suco.202300764

Haluk Görkem Alcan, Abdulkadir Cüneyt Aydın

{"title":"Torsional behavior of composite shear walls and load‐bearing sandwich panels: An experimental investigation","authors":"Haluk Görkem Alcan, Abdulkadir Cüneyt Aydın","doi":"10.1002/suco.202300764","DOIUrl":"https://doi.org/10.1002/suco.202300764","url":null,"abstract":"This study aims to experimentally investigate the torsional behavior of acrylic latex polymer and alkali‐resistant glass fiber‐reinforced composite shear walls and load‐bearing sandwich panels. Also, this study was aimed to experimentally examine the changes in the torsional moment capacities, twist angle values, energy dissipation capacities, ductility index, and rigidity of the samples for the presence of the additives added to concrete, size, presence of reinforcement in sandwich panels, and effect of sandwich panels. Within the scope of this work, a control sample, two composite shear walls, and two sandwich panels were produced (1500 × 1200 × 150 mm). While adding 5% acrylic latex to the concrete phase of one of the composite shear wall groups, in the other group, both 5% acrylic latex and 1% alkali‐resistant glass fibers were added to the concrete. While the core structure of the sandwich panel group is reinforced, the other group is produced without reinforcement. A total of 10 samples were loaded out of the plane and a torsional moment is created. As a result of the experiment, the torsional moment, twist angle, and energy dissipation capacities were increased for the samples with acrylic latex and alkali‐resistant glass fiber. While glass fibers increased the ductility index of the test samples, they decreased the stiffness value. Acrylic latex, on the other hand, does not have much effect on the ductility index and stiffness value and increased its energy dissipation capacity. Reinforced sandwich panel samples presented greater torsional moment capacities and stiffnesses compared to composite walls, and less ultimate twist angles and energy dissipation capacities. In addition, although the experimental results of the sandwich panels without reinforcement are lower than the other groups, these also showed load‐bearing capability under the effect of the torsional moment.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"98 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Cyclic behavior of the reinforced concrete shear walls with opening retrofitted with steel plate 加装钢板的带开口钢筋混凝土剪力墙的循环行为

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-29 DOI: 10.1002/suco.202300285

Fatemeh Abdoos, Majid Gholhaki, Ali Kheyroddin

{"title":"Cyclic behavior of the reinforced concrete shear walls with opening retrofitted with steel plate","authors":"Fatemeh Abdoos, Majid Gholhaki, Ali Kheyroddin","doi":"10.1002/suco.202300285","DOIUrl":"https://doi.org/10.1002/suco.202300285","url":null,"abstract":"The reinforced concrete (RC) shear walls are widely used as the lateral load‐resisting system due to their adequate ductility and great energy dissipation capacity. On the other hand, use of these walls can reduce the size of the beams and columns and also, decreases the lateral displacements. However, presence of the openings in the shear walls alters the behavior of the wall and therefore, the dimensions and position of the opening play a key role in the performance of this structural system. In this study, an RC shear wall with eccentric opening was verified using ABAQUS software. This model, which is called the reference model, a wall and a pier have been created according to aspect ratios given by ACI318‐14. This model was retrofitted with the steel plates arranged in various patterns and effect of each pattern on the system's performance was investigated and the best one was selected. The best steel plate arrangement increased the ultimate strength, maximum strength, cracking strength, and energy dissipation capacity by 127.3%, 13.42%, 22.53%, and 16.8%, respectively. To practically use this retrofit technique, three low, mid, and high‐rise buildings designed based on the old and new versions of the Iranian Code of Practice for Seismic Resistant Design of Buildings (Standard 2800) were upgraded with this technique and their performance was evaluated and performance of the substandard and standard buildings were compared with each other. The research results showed the ST52 steel plates do not considerably increase the maximum and cracking strength and could enhance the ultimate strength insignificantly. By retrofitting the edges of the openings by the diagonal steel plates and preventing spread of the cracks at the edges and corners, satisfactory results could be attained. Simultaneous use of the vertical and horizontal plates is an effective solution to increase the flexural and shear capacity of the structure.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"24 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Vertical load distribution in precast hollow core floors: State of the art and future perspectives 预制空心楼板的垂直荷载分布：技术现状与未来展望

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-29 DOI: 10.1002/suco.202301150

Miłosz Jeziorski, Wit Derkowski, Elena Michelini

引用次数: 0

Optimization of steam curing process for Chinese Western and Northeast regions' high‐speed railway concrete prefabricated components 优化中国西部和东北地区高速铁路混凝土预制构件的蒸汽养护工艺

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-29 DOI: 10.1002/suco.202400079

Yu Xiang, Peilun Duan, Jilin Wang, Guokang Jiang, Zuhao Hu, Qiyuan Xiao, Xiaohui Zeng

{"title":"Optimization of steam curing process for Chinese Western and Northeast regions' high‐speed railway concrete prefabricated components","authors":"Yu Xiang, Peilun Duan, Jilin Wang, Guokang Jiang, Zuhao Hu, Qiyuan Xiao, Xiaohui Zeng","doi":"10.1002/suco.202400079","DOIUrl":"https://doi.org/10.1002/suco.202400079","url":null,"abstract":"This article aims to address the issues of high curing temperatures and thermal damage in the production of prefabricated concrete components for high‐speed railways in high‐altitude and high‐latitude cold regions of China. Various steam‐curing processes for concrete are designed to optimize the high‐quality preparation process of steam‐cured concrete prefabricated components in cold environments. With the goal of controlling the residual expansion deformation and considering the overall impact of curing process on the mechanics, durability, and interface transition zone of steam‐cured concrete, the main conclusions obtained in this study are as follows. Within a pre‐curing time of 3–6 h, when the curing temperature is maintained at 45–60°C, the final residual expansion deformation can be controlled below 300 με. The compressive strength, dynamic elastic modulus, peak stress, water absorption and Chloride ion resistance of steam‐cured concrete show the great improvement under above curing processes. Curing at 80°C should be actively avoided, and it is recommended to adopt a 6 h pre‐curing time with a maximum curing temperature of 45°C, especially for cold regions in China. This study can serve as a valuable reference and provide support for the preparation of prefabricated concrete components in Chinese high‐altitude and high‐latitude areas.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"59 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Fastening in concrete vs. rock mass—Comparative determination of pull‐out loads for artificially created discontinuities in concrete 混凝土中的紧固与岩体中的紧固--比较测定混凝土中人为制造的不连续面的拉拔荷载

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-29 DOI: 10.1002/suco.202400059

O. Zeman, K. Voit, S. Lamplmair‐Irsigler

{"title":"Fastening in concrete vs. rock mass—Comparative determination of pull‐out loads for artificially created discontinuities in concrete","authors":"O. Zeman, K. Voit, S. Lamplmair‐Irsigler","doi":"10.1002/suco.202400059","DOIUrl":"https://doi.org/10.1002/suco.202400059","url":null,"abstract":"Possible discontinuities in the subsurface have a major impact on the load‐bearing behavior of post‐installed fastenings. For concrete, the behavior of post‐installed anchors and thus their design can be clearly addressed as concrete is assumed as a homogeneous fastening substrate. This is valid except, for example, in the area of building joints and at joints of precast concrete elements, where the formation of structural joints inevitably occurs and which basically correspond to a separation surface. In contrast, rock mass is characterized by the rock type, but is generally also significantly influenced by its discontinuities. These play a decisive role concerning rock mass stability and show a great impact on the load‐bearing capacity of rock, especially for fasteners with a shallow embedment depth. It is to be assumed that the same also applies to separating surfaces in concrete. Furthermore, the question arises as to the non‐destructive preliminary detectability of such weak zones. For carrying out a comparative study under controlled conditions, artificial interfaces of different geometries were generated in concrete in laboratory tests by inserting PTFE layers at different positions of the test member. Pull‐out tests of post‐installed fastening systems were carried out in their vicinity to determine the load transfer as well as the failure mode. It could be shown that discontinuities have a negative effect on pull‐out loads not only in the rock mass, but also in concrete. However, detection of these by means of a rebound hammer was only possible in the rock mass.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"41 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Prediction of compressive strength of cross‐shaped stub CFSTs under axial loading: Numerical and analytical study 轴向加载下十字形存根 CFST 的抗压强度预测：数值和分析研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-28 DOI: 10.1002/suco.202301048

Muhammad Hassam, Lanhui Guo, Muhammad Tahir, Muhammad Atasham ul haq, Rizwan Jamil

{"title":"Prediction of compressive strength of cross‐shaped stub CFSTs under axial loading: Numerical and analytical study","authors":"Muhammad Hassam, Lanhui Guo, Muhammad Tahir, Muhammad Atasham ul haq, Rizwan Jamil","doi":"10.1002/suco.202301048","DOIUrl":"https://doi.org/10.1002/suco.202301048","url":null,"abstract":"Special‐shaped concrete‐filled steel tubes (CFSTs) have been used in modern structures like high‐rise commercial and residential buildings due to their superior structural performance compared to steel and reinforced concrete members. Various shapes of special‐shaped CFSTs might be necessary to meet architectural and aesthetic needs. Cross‐shaped CFSTs could be used where two orthogonal walls cross in high‐rise buildings. However, at present, the research on the compressive performance of cross‐shaped CFSTs is limited, consequently, the unavailability of design guidelines and design‐oriented strength prediction models. Therefore, in this study, a finite element (FE) model of cross‐shaped CFSTs was developed following the past experimental data, and the model's accuracy was verified by the failure modes and load–strain curves of specimens. Sensitivity analysis was performed for some parameters of the concrete damaged plasticity model besides imperfections and residual stress. The parametric analysis was conducted considering various study parameters such as the width‐to‐thickness ratio, width‐to‐depth ratio, and steel and concrete strengths. The compressive strength of cross‐shaped CFSTs was predicted by different design codes and available design formulas, which gave unsatisfactory results necessitating the development of new strength prediction models. Finally, a new design formula was developed by performing a linear regression of FE and test results. The proposed formula predicted the strength of cross‐shaped CFSTs with great accuracy and can be used for design purposes.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"72 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141166704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Early‐age cracking due to restraint: Laboratory and field investigations on the predictive capacity of the simplified method in Annex D of the future EC2 受约束引起的早期开裂：对未来 EC2 附件 D 中简化方法预测能力的实验室和实地调查

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-27 DOI: 10.1002/suco.202400173

Antonia Menga, Jean‐Michel Torrenti, Terje Kanstad, Anja Birgitta Estensen Klausen

引用次数: 0

Axial and bending behavior of GFRP bar‐reinforced hollow‐core polypropylene fiber concrete columns GFRP 棒材加固空心聚丙烯纤维混凝土柱的轴向和弯曲行为

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-25 DOI: 10.1002/suco.202200921

Habil Ahmad, M. Neaz Sheikh, Muhammad N. S. Hadi

{"title":"Axial and bending behavior of GFRP bar‐reinforced hollow‐core polypropylene fiber concrete columns","authors":"Habil Ahmad, M. Neaz Sheikh, Muhammad N. S. Hadi","doi":"10.1002/suco.202200921","DOIUrl":"https://doi.org/10.1002/suco.202200921","url":null,"abstract":"This study reported the axial (concentric and eccentric) and bending (four‐point bending) loadings behavior of glass fiber‐reinforced polymer (GFRP) bar‐reinforced hollow‐core polypropylene fiber concrete (HC‐GFRP‐PFC) columns. The confinement effect of HC‐GFRP‐PFC columns with different center‐to‐center (c/c) spacing of GFRP spirals was also investigated. Twelve hollow‐core circular specimens with an outer diameter of 214 mm and an inner (circular hole) diameter of 56 mm were experimentally investigated. Four reference specimens were cast with nonfibrous (normal) concrete, whereas the remaining eight specimens were cast with polypropylene fiber (0.15% by volume of concrete) concrete. It was found that, with a similar ratio of reinforcement, the HC‐GFRP‐PFC specimens gained 2%–4% higher maximum load (PMaximum) and 9%–19% higher ductility (μ) than the GFRP bar‐reinforced hollow‐core nonfibrous concrete (HC‐GFRP‐NFC) specimens under concentric axial loading and four‐point bending. The HC‐GFRP‐PFC specimens with a 30 mm c/c spacing of the GFRP spiral gained 6%–36% higher PMaximum and 4%–59% higher μ than the HC‐GFRP‐PFC specimens with a 60 mm c/c spacing of the GFRP spirals under different loading conditions.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"5 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Experimental and numerical investigation of the bending, shear, and punching shear behavior of recycled aggregate concrete precast/prestressed hollow core slabs 再生骨料混凝土预制/预应力空心板弯曲、剪切和冲剪行为的实验和数值研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-05-23 DOI: 10.1002/suco.202400008

Michael J. McGinnis, Michael V. Gangone, Alejandro Nogales, Lizeth Marisol Gomez‐Santana, Brad Weldon, Adam Reihl, Nikola Tošić, Yahya Kurama

{"title":"Experimental and numerical investigation of the bending, shear, and punching shear behavior of recycled aggregate concrete precast/prestressed hollow core slabs","authors":"Michael J. McGinnis, Michael V. Gangone, Alejandro Nogales, Lizeth Marisol Gomez‐Santana, Brad Weldon, Adam Reihl, Nikola Tošić, Yahya Kurama","doi":"10.1002/suco.202400008","DOIUrl":"https://doi.org/10.1002/suco.202400008","url":null,"abstract":"Although it has been shown that using recycled concrete aggregate in new structural concrete is economical and sustainable, the use of this material for such applications is still not widespread. One of the reasons is that manufacturers, designers, engineers, owners, and other market players are not familiar with specifying and utilizing this material—although standards are starting to incorporate provisions for recycled aggregate concrete, successful, practical example projects are needed. The current paper describes the results of a partnership between universities and a precast concrete manufacturer of hollow core slabs. Seven hollow core slabs with volumetric replacement ratios of natural aggregate with recycled aggregate from 0% to 60% were tested to failure in both bending and shear, and then undamaged portions of the slabs were subjected to punching shear until failure. The results showed only mild differences in strength, with different replacement percentages of recycled aggregate under the various loading scenarios. Numerical simulations performed in Abaqus demonstrated the feasibility of analyzing recycled aggregate concrete structural elements and provided important insights into their behavior.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"50 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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