Structures最新文献_第9页

Developing novel nuclear containment structures: Current status and future prospects 开发新型核安全壳结构：现状与前景

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107161

Shen Wang, Chaoqi Zhang, Di Yao

{"title":"Developing novel nuclear containment structures: Current status and future prospects","authors":"Shen Wang, Chaoqi Zhang, Di Yao","doi":"10.1016/j.istruc.2024.107161","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107161","url":null,"abstract":"Nuclear containment structures serve as the main line of defense to prevent escape of radioactive material during catastrophic events including the loss of coolant accident (LOCA), aircraft impact, explosions and earthquake. For more than half a century, structural types of nuclear containment remain essentially unchanged. With construction cost of recent nuclear projects increasing significantly, there is need to improve containment structures in order to achieve better cost efficiencies, schedule improvement and sustainability by utilizing the latest industry trends, technologies and innovations. Future novel containment may use Steel-Plate Composite (SC), Ultra High Performance Concrete (UHPC), 3D printing Concrete (3DPC), performance-based and risk-informed design method, and so on. With a lack of industry experience, however, specialists in aforementioned technical areas face additional challenges in spreading knowledge to nuclear containment designers so that the latter can be versed in applying those technologies. For these reasons, a comprehensive literature study on recent development trends on novel nuclear containment structures should be conducted. This article provides a comprehensive survey of current technological challenges and prospects for developing various novel containment types. Advantages and shortcomings of each technology, as well as their applicability in nuclear containments are evaluated and discussed. This state-of-the-art review is aimed at helping designers and researchers of future nuclear containments widen the use of relevant technologies and innovations. This review can serve as a starting point for developing future novel containment structures.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Regression prediction model for shear strength of cold joint in concrete 混凝土冷缝抗剪强度回归预测模型

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107168

Ziqin Zhong, Shixing Zhao, Jing Xia, Qirui Luo, Qiaoling Zhou, Shuheng Yang, Fei He, Yu Yao

{"title":"Regression prediction model for shear strength of cold joint in concrete","authors":"Ziqin Zhong, Shixing Zhao, Jing Xia, Qirui Luo, Qiaoling Zhou, Shuheng Yang, Fei He, Yu Yao","doi":"10.1016/j.istruc.2024.107168","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107168","url":null,"abstract":"The shear resistance of cold joint in concrete is influenced by various design parameters. Traditional mechanical models typically consider only a limited number of parameters to predict the shear strength of cold joints. This research aims to explore the complex nonlinear relationship between design parameters and cold joint shear strength using statistical method and machine learning technology. The goal is to develop a more accurate, reliable, and engineering applicable regression model for predicting shear strength. A dataset of 546 Z-shaped shear specimens characterizing cold joint in concrete was constructed, involving a total of 16 variables that may affect shear performance. Correlation analysis and recursive elimination were adopted to eliminate correlated and insignificant variables based on their importance. Multiple linear regression (MLR), random forest regression (RFR), and support vector machine regression (SVR) prediction models for cold joint shear strength were established based on rigorously screened variables and comprehensively evaluated using multiple methods. It was found that the most significant factors influencing the shear strength of cold joints are concrete strength, interface shear key, product of interface reinforcement strength and its reinforcement ratio, normal stress, fiber length of new concrete, casting method of the new concrete, and product of the fiber length and its tensile strength of old concrete. The MLR, SVR, and RFR models all exhibited superior performance relative to traditional mechanics-based models with regard to shear strength prediction of cold joints. The RFR model is recommended for predicting the shear strength of cold joints due to its superior evaluation indexes in comparison to the MLR and SVR models, and variable sensitivity analysis shows that it does not yield common-sense errors.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Low-carbon repair of RC columns using sandwiched RAC and FRP-steel composite tube: Axial compression tests and design 使用夹层 RAC 和 FRP 钢复合管对 RC 柱进行低碳修复：轴向压缩试验与设计

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107181

Yaojia Chen, Yubo Jiao, Hua Chen

{"title":"Low-carbon repair of RC columns using sandwiched RAC and FRP-steel composite tube: Axial compression tests and design","authors":"Yaojia Chen, Yubo Jiao, Hua Chen","doi":"10.1016/j.istruc.2024.107181","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107181","url":null,"abstract":"This paper introduces a sustainable and environmentally friendly structural reinforcement method, which involves using fiber-reinforced polymer (FRP) steel composite tubes and sandwiched recycled aggregate concrete (RAC) to strengthen reinforced concrete (RC) columns. A total of fourteen specimens were designed to test under axial compression, including thirteen retrofitted columns and one original column. The effects of recycled coarse aggregate (RA) replacement ratio, external FRP layers, steel tube thickness, RAC strength grade, and confinement tube type on the structural performance of retrofitted columns were investigated. The research results demonstrated that FRP-steel composite tube composed of inner steel tube and external FRP showed efficient confinement ability and synergistic effects, which significantly improved the load-bearing capacity and stiffness of the original column. The bonding performance between sandwiched RAC and original concrete mainly depended on the confinement effect of inner steel tube. Waist bulge failure and shear failure were observed on the modified column, which can be divided into five characteristic points according to the stepwise failure behavior. Five existing strength models were reasonably modified by considering the strength contribution of each component material. Meanwhile, a prediction model was proposed based on the ultimate equilibrium theory to evaluate the load-bearing capacity of retrofitted columns. The findings of this study contribute to promoting the application of RAC in structural reinforcement, offering practical cases and references for low-carbon reinforcement strategies.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A non-smooth dynamic model for pounding analysis of simple span bridges under seismic excitations 地震激励下简单跨度桥梁冲击分析的非光滑动力模型

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107187

Wenshan Li, Zhao Liu, Suiwen Wu

{"title":"A non-smooth dynamic model for pounding analysis of simple span bridges under seismic excitations","authors":"Wenshan Li, Zhao Liu, Suiwen Wu","doi":"10.1016/j.istruc.2024.107187","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107187","url":null,"abstract":"Small- and medium-span simply supported bridges are widely used in highway bridges, which are vulnerable to pounding-induced damage under strong earthquake action. Thus, developing a precise and appropriate mechanical model is crucial for practitioners and researchers to investigate the pounding effect and damage mechanism of bridges under seismic excitations. This paper presents a non-smooth dynamic framework to address the pounding problem of simple span bridges under seismic excitations. Normal pounding force and corresponding transverse friction force are added to the fundamental dynamic equation using constrained Jacobian matrixes, and the motion equation for the system is created to portray the pounding behavior of the structure at the pounding locations. The shake table test results obtained by the author from the previous experiment were employed to validate the proposed method. The comparison shows that the proposed model can precisely predict the pounding scenario of simple span bridges under seismic excitations. Finally, the influence of the coefficient of friction (CoF), the coefficient of restitution (CoR), and the nonparallel pounding effect (NPE) on the peak girder rotation (PGR) are analyzed. It is found that simple span bridges can exhibit in-plane rotation if the CoF is more than 0.3 and the rotation is not significantly affected by an increase in CoF from 0.4 to 1.0.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

The first engineering application of 10MN CFRP cables in cable-stayed bridge in China 10MN CFRP 索在中国斜拉桥上的首次工程应用

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107199

Ligang Qi, Jie Bai, Hangzi Wu, Guowen Xu, Hao Xiong, Yan Yang

{"title":"The first engineering application of 10MN CFRP cables in cable-stayed bridge in China","authors":"Ligang Qi, Jie Bai, Hangzi Wu, Guowen Xu, Hao Xiong, Yan Yang","doi":"10.1016/j.istruc.2024.107199","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107199","url":null,"abstract":"Existing engineering applications typically involve carbon fiber reinforced polymers (CFRP) cables with relatively small ultimate tensile forces (less than 10MN). This study presents the engineering application of China's first thousand-ton-grade CFRP cable-stayed bridge. The optimal steel and CFRP hybrid cable system was determined through a comparative analysis of structural behavior and life cycle cost. Thereafter, the CFRP cable, consisting of 121 strands of φ7 CFRP tendons, along with its anchoring system, was designed and manufactured with a theoretical ultimate tensile strength of 10,710 kN (). Subsequently, the mechanical properties of 7–121 CFRP cable were investigated and experimentally verified. The tensile test revealed a satisfied ultimate tensile bearing capacity of 10,805 kN. Furthermore, after two million fatigue cycles, the CFRP cables retained approximately 90 % of their theoretical ultimate force, highlighting their excellent fatigue resistance. Besides, no damage occurred with a maintained tension force of 0.45 at a temperature of 150 °C for a duration of at least 30 min, meeting the requirements of specification. Moreover, the key procedures of CFRP cable installation were also claimed. This study aims to further promote the application and development of CFRP cables in larger span and even super-long span bridges.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Analysis of the form, construction, and structural conception of Silberkuhl shells through construction history and advanced HBIM 通过建筑历史和先进的 HBIM 分析西尔伯库尔壳体的形式、构造和结构构思

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107118

Martina Russo, Pio Lorenzo Cocco, Ilaria Giannetti

{"title":"Analysis of the form, construction, and structural conception of Silberkuhl shells through construction history and advanced HBIM","authors":"Martina Russo, Pio Lorenzo Cocco, Ilaria Giannetti","doi":"10.1016/j.istruc.2024.107118","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107118","url":null,"abstract":"In the 20th century, the development of industrial buildings featured a strong relationship between form, conception, needs of production processes, and advanced structural solutions. The knowledge, safeguard, and valorization of the industrial heritage structures, of the 20th century, requires a multidisciplinary approach, including construction history, structural analysis, and advanced 3D modeling. In particular, the study of shape-resistant structures in reinforced concrete – such as thin shells – needs to consider the deeply intertwined aspects of form, construction, and structural conception. The main aim of the present paper is to set a methodological workflow based on the combination of archival research, Historic/Heritage Building Information Modeling (HBIM), and numerical structural analysis to support the knowledge, safeguard, and valorization of the thin shells in reinforced concrete. The effectiveness of the proposed methodology, scalable for the analysis of historical shell structures in reinforced concrete, is tested on the noteworthy case study of the so-called Silberkuhl shells. According to their convenience in terms of structural efficiency and economy of construction, this system stood out worldwide for industrial roofing in the second half of the 20th century, exploiting the possibility of both industrial production and on-site precast, adapting to different economic and technological backgrounds.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 study on T-shaped reinforced concrete beams with locally reduced cross-sections 局部缩小横截面的 T 型钢筋混凝土梁试验研究

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107180

S.S. Zhang, D.D. Zhang, X.F. Nie, J.P. Ye

{"title":"Experimental study on T-shaped reinforced concrete beams with locally reduced cross-sections","authors":"S.S. Zhang, D.D. Zhang, X.F. Nie, J.P. Ye","doi":"10.1016/j.istruc.2024.107180","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107180","url":null,"abstract":"The principle of strong column and weak beam (SCWB) is often adopted in the design of reinforced concrete (RC) frames to ensure their optimum seismic performance. However, insufficient consideration of the SCWB hierarchy has resulted in numerous existing RC frames violating such a hierarchy. Consequently, a novel seismic retrofitting technique (section reduction technique) was proposed for RC frames that violate the SCWB hierarchy. The section reduction (SR) technique involves creating a locally reduced cross-sections (i.e., a gap) in the bottom region of the beam (i.e., the compression region of the beam under negative bending) adjacent to the beam-to-column joint and applying a fiber-reinforced polymer (FRP) strengthening system, which reduces the negative bending capacity of the beam while improving the shear capacity of the gap region. Nine full-size RC beams were fabricated and three-point negative bending experiments were conducted to demonstrate the validity of the SR technique. Based on the test results, it was found that a gap of appropriate size can effectively reduce the negative bending capacity of a T-shaped RC beam. In addition, the ductility of the beams can be ensured if the occurrence of FRP U-jacket debonding can be effectively prevented when applying the FRP strengthening system.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Vibration-based health monitoring and damage detection in beam-like structures with innovative approaches based on signal processing: A numerical and experimental study 采用基于信号处理的创新方法，对类梁结构进行基于振动的健康监测和损伤检测：数值和实验研究

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107211

Mohtasham Khanahmadi, Borhan Mirzaei, Behzad Dezhkam, Omid Rezaifar, Majid Gholhaki, Gholamreza Ghodrati Amiri

引用次数: 0

Findings from in-situ survey of post-tensioned precast and segmental post-tensioned bridges 后张法预制桥梁和节段后张法桥梁的现场调查结论

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107190

Jakub Gašpárek, Peter Paulík, Denis Kopásek

{"title":"Findings from in-situ survey of post-tensioned precast and segmental post-tensioned bridges","authors":"Jakub Gašpárek, Peter Paulík, Denis Kopásek","doi":"10.1016/j.istruc.2024.107190","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107190","url":null,"abstract":"During 2019 and 2020, several segmental post-tensioned bridges or footbridges collapsed in the Slovak Republic. As a result of this sequence of bridge collapses, an inspection of a large number of segmental post-tensioned structures has been carried out since 2022 in order to determine their condition and risk rating. The inspections were carried out by Slovak universities and private companies. The findings obtained from the targeted bridge diagnostics carried out by the Department of Concrete Structures and Bridges of the Slovak University of Technology in Bratislava are presented in this paper in the context of published international findings and reports. One of the main objectives was to investigate the post-tensioned tendons and to determine the possible absence of grouting, which has an impact on the determination of the risk rating of the bridges. The data obtained so far from Slovak bridges show that half of the inspected old post-tensioned bridges (built in the 1960s, 70 s and 80 s) have some percentage of tendons, which are only partially or, in some cases, completely ungrouted. As a result of these findings, in some cases, it was necessary to reduce the number of traffic lanes or the maximum permitted load of vehicles on the bridge. Even before the late stage of corrosion, visible phenomena on the concrete surface have been observed, showing the possibility of ungrouted and corroded tendons in the bridge. This paper summarises some of the problems of post-tensioned bridges and the state-of-the-art in prestress control. Following the brittle collapses of bridges that have occurred in Slovakia, the article complements some of the knowledge gained during the targeted diagnosis of post-tensioned segmental bridges also in the context of demolitions of some high-risk bridges that have been carried out.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Flexural capacity and failure trend of fiber and steel reinforcement reinforced cement stabilized rammed earth beams 纤维和钢筋加固水泥稳定夯土梁的抗弯能力和破坏趋势

IF 4.1 2区工程技术

Structures Pub Date : 2024-09-03 DOI: 10.1016/j.istruc.2024.107170

Liangyi Zhang, Tiegang Zhou, Junhai Lu, Wei Tan, Zengfei Liang

{"title":"Flexural capacity and failure trend of fiber and steel reinforcement reinforced cement stabilized rammed earth beams","authors":"Liangyi Zhang, Tiegang Zhou, Junhai Lu, Wei Tan, Zengfei Liang","doi":"10.1016/j.istruc.2024.107170","DOIUrl":"https://doi.org/10.1016/j.istruc.2024.107170","url":null,"abstract":"Due to the low flexural strength of rammed earth, it is prone to flexural cracks under horizontal loads, necessitating the development of novel structural measures to enhance its flexural capacity. This study introduced the reinforcement of rammed earth structures with embedded steel reinforcement to improve their flexural performance. A series of two-point loading tests were conducted on 12 rammed earth beams to investigate the effects of polypropylene fiber content and steel reinforcement ratio on the deflection, cracking load, ultimate load, flexural toughness, and failure modes of the beams. Based on the assumption of the plane section, a design formula for the flexural capacity of reinforced rammed earth beams was proposed and validated against experimental results. The findings indicate that the addition of polypropylene fibers increased the cracking load, deformation capacity, and flexural toughness of the rammed earth beams by 14.8 %, 44.2 %, and 105.6 %, respectively. In contrast, the inclusion of steel reinforcement significantly enhanced the ultimate load, deformation capacity, and flexural toughness by 596.3 %, 607.0 %, and 4543.2 %, respectively, transforming the failure mode from brittle fracture to ductile flexural failure. The proposed formula was validated and can be effectively used to calculate the flexural capacity of reinforced rammed earth beams.","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":4.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142222203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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