Structures最新文献

{"title":"Experimental study on seismic behavior of self-slitting composite shear walls with external O-type dampers","authors":"Minsheng Guan ,&nbsp;Yang Li ,&nbsp;Weijie Zhao ,&nbsp;Vipulkumar Ishvarbhai Patel ,&nbsp;Andrew Antiohos ,&nbsp;Zora Vrcelj ,&nbsp;Qing Quan Liang","doi":"10.1016/j.istruc.2025.109085","DOIUrl":"10.1016/j.istruc.2025.109085","url":null,"abstract":"<div><div>Shear walls are efficient lateral load resisting systems for high-rise buildings due to their significant stiffness and load-carrying capacity. The constraints such as floor height can lead to the design of squat walls with brittle failure characteristics. Earthquake damage assessments highlight the need for improved elastic-plastic deformation and energy dissipation capacities to enhance structural safety. To address these needs, this study proposes an innovative self-slitting composite shear wall (CSW) incorporating four circular concrete-filled steel tubular (CFST) columns, plain concrete regions, and external O-type dampers. Experimental program and results are described on four CSWs under quasi-static cyclic loads with varying parameters, such as plain concrete spacing, the number of O-type dampers, and axial load ratios. The results indicate that increasing the number of O-type dampers considerably improves the strength, ductility, and energy dissipation capacity of CSWs. The flexural strength of CSWs is shown to decrease with an increase in the plain concrete spacing. Increasing the axial load ratio enhances the stiffness, delays cracking but diminishes the ductility and energy dissipation of CSWs. The observed failure process of CSWs under lateral loads was characterized by initially forming macroscopic cracks in plain concrete regions, followed by transitions through three distinct phases: integral, slit, and segmented walls. This behavior aligns with the three-level seismic design criteria: enhancing structural resilience by effectively resisting minor earthquakes, accommodating moderate ones, and safely dissipating energy during severe seismic events.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109085"},"PeriodicalIF":3.9,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911934","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}

{"title":"In-plane shear behavior of masonry walls strengthened with HDC repointing in bed joints and HDC layer under diagonal compression loads","authors":"Tong Li ,&nbsp;Mingke Deng ,&nbsp;Zhengtao Qiu ,&nbsp;Xuesong Wang ,&nbsp;Shuo Yang","doi":"10.1016/j.istruc.2025.109088","DOIUrl":"10.1016/j.istruc.2025.109088","url":null,"abstract":"<div><div>In this study, a simple and easy construction strengthening method, referred to as high ductile concrete (HDC) repointing in bed joints and/or HDC overlay, were proposed for improving in-plane shear behavior of unreinforced masonry (URM) walls. For this purpose, one URM wall and five HDC-strengthened masonry walls were prepared and tested under diagonal compression. The failure mode, shear stress-strain behavior, shear strength and ultimate strain were analyzed and discussed. HDC strengthening system improved the shear failure mode of masonry walls, preventing masonry from serious damage. The reinforced masonry walls exhibited a more ductile failure and kept good integrality. Besides, HDC system effectively increased both shear strength and ultimate shear strain of masonry walls, with normalized value ranging from 1.8 to 6.5 for shear strength and from 21.1 to 109.0 for ultimate strain. Based on the contribution provided by HDC repointing and HDC layer, the results obtained from the current paper allowed the use of superposition method to calculate shear capacity of HDC-strengthened masonry walls. The analytical model gave a conservative and reliable prediction, which can be used in engineering design.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109088"},"PeriodicalIF":3.9,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908091","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}

{"title":"Study on the mechanical properties of the Miura-ori inspired retractable roof structure","authors":"Jinyu Lu,&nbsp;Jiang-Jun Hou,&nbsp;Ding Lu,&nbsp;Jilei Liu","doi":"10.1016/j.istruc.2025.109040","DOIUrl":"10.1016/j.istruc.2025.109040","url":null,"abstract":"<div><div>A retractable roof is a structure that can move or fold to open or close a covered area. Detailed static and dynamic analyses of an innovative Miura-ori inspired retractable roof structure are investigated using the finite element parametric modeling method. Essential geometric parameters (such as the acute angles of parallelograms, the shape of the parallelogram panels, and the number of scissor joint units) are parameterized to investigate the mechanical properties of the structure in various geometric configurations under three distinctive operational states (completely folded, half-opened, and fully open). Initially, a static performance analysis of this innovative retractable roof structure is conducted. Subsequently, studies of the instability modes and parametric static stability performances in different states are examined. Finally, the basic natural frequency characteristics and the parametric dynamic stability of the structure in various states are performed. The preliminary mechanical analysis indicates the Miura-ori inspired retractable roof is a viable structural system. Additionally, the parametric analysis results herein offer guidance for further investigation and real-world implementation of this novel roofing system.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109040"},"PeriodicalIF":3.9,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912399","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}

{"title":"Numerical evaluation of cyclic and seismic performance of three-core buckling-resistant braces with partially re-centering properties","authors":"Hesam Azizi","doi":"10.1016/j.istruc.2025.109078","DOIUrl":"10.1016/j.istruc.2025.109078","url":null,"abstract":"<div><div>Recent studies have demonstrated the enhanced seismic performance of structures incorporating dual-core buckling-resistant braces (DC-BRBs) utilizing materials with distinct yield strengths. This research introduces a novel three-core BRB (TC-BRB) featuring partially re-centering characteristics, assembled from diverse metallic constituents. Initially, the TC-BRB configuration is delineated, followed by a numerical investigation employing finite element analysis to ascertain the factors influencing its cyclic behavior, encompassing hysteresis curves, cumulative energy dissipation, and re-centering properties under cyclic loading. High-strength steels (HSS), structural steels, and low-yield point (LYP) steels were employed as TC-BRB cores. Furthermore, an examination of parameters affecting TC-BRB behavior was conducted by incorporating cores with variable lengths and cross-sections. Subsequently, by integrating the proposed brace into 4- and 8-story structural systems and subjecting them to two hazard levels, namely, the design base earthquake (DBE) and maximum considered earthquake (MCE), the seismic response of these structures was assessed through nonlinear dynamic and incremental dynamic analysis. Additionally, fragility response curves were generated and compared for the investigated structures. The findings revealed that the cyclic behavior of TC-BRBs, characterized by desirable multi-stage characteristics, contributes to a reduction in structural responses, including inter-story drift ratio (IDR), residual drift ratio (RIDR), and peak floor acceleration (PFA), within the studied systems. Moreover, while achieving higher performance levels, the probability of collapse was diminished.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109078"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908087","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}

{"title":"An improved guide weight method for multi-constraints structural optimization design","authors":"Yi Zhou,&nbsp;Huqi Wang","doi":"10.1016/j.istruc.2025.109058","DOIUrl":"10.1016/j.istruc.2025.109058","url":null,"abstract":"<div><div>The guide-weight method (GWM) is an effective approach for structural optimization, known for its exceptionally fast convergence rate. However, the inability to optimize multiple constraints simultaneously limits the effectiveness of this method. This study proposes an improved guide-weight method (MIGW) for multi-constraints structural optimization. Different from existing GWM, the proposed MIGW concurrently solves all Lagrange multipliers (variable <em>λ</em>) for multi-constraints, enabling synchronously optimization under multiple constraints. Therefore, this method reduces the complexity of structural analysis and number of structural analyses. Additionally, the range of step length (variable <em>α</em>) for each design variable is also determined to ensure that the post-iteration values remain within the preset limits. Different <em>α</em> values are assigned to different design variables, enhancing the flexibility of the optimization process. The convergence speed is improved by comparing the guide weight with the weight to determine the iterative direction of the design variables. The performance of the proposed MIGW is evaluated using a ten-bar planar truss as a benchmark example. The results show that compared to the GWM and heuristic optimization algorithms, the number of analyses required by MIGW was reduced by 50 % and 178 times, respectively, while yielding similar results.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109058"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908090","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}

{"title":"Study on mechanical behavior of single-sided ring-groove riveted aluminum alloy (SS-RGRAA) shear connections","authors":"Mingze Wu ,&nbsp;Yuanqing Wang ,&nbsp;Shenggang Fan ,&nbsp;Huan Lu ,&nbsp;Wei Li ,&nbsp;Yecheng Dai","doi":"10.1016/j.istruc.2025.109098","DOIUrl":"10.1016/j.istruc.2025.109098","url":null,"abstract":"<div><div>Single-sided ring-groove rivets are a type of rivet that can be installed using only one accessible side. Due to their single-sided forming characteristics, these rivets are particularly well-suited for the installation and construction of closed-section components, such as box-section members. In aluminum alloy joints, connections formed by aluminum alloy plates and single-sided ring-groove rivets (referred to hereafter as SS-RGRAA shear connections) are commonly used for shear loading. The mechanical performance of these connections is crucial for the analysis and design of joints. However, current standards do not provide specific calculation methods for the ultimate resistance of SS-RGRAA shear connections, and existing research on this topic is limited. Therefore, this study employs experimental research, numerical simulation analysis, parametric analysis, and theoretical analysis to investigate the mechanical performance of SS-RGRAA shear connections. Firstly, this study conducts experimental studies on the mechanical performance of SS-RGRAA shear connections, focusing on the effects of rivet layout, end distance (<em>e</em>₁), rivet edge distance (<em>e</em>₂), and et al. on mechanical behavior. Secondly, a refined finite element analysis (FEA) model was developed and validated against experimental results. Based on the established FEA model, parametric analyses were performed to explore in detail how aluminum alloy material properties, end distance (<em>e</em>₁), edge distance (<em>e</em>₂), rivet diameter (<em>d</em>_pin), and inner plate thickness (<em>t</em>) affect the mechanical performance of shear connections. Finally, based on the results of the parametric analysis and referencing existing calculation methods from relevant standards, an improved and refined calculation method for the ultimate resistance of SS-RGRAA shear connections was proposed.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109098"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903978","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}

{"title":"Seismic strengthening of masonry structures using sustainable reinforceing materials: A comparative analysis","authors":"Arkadeep Sen ,&nbsp;Lipika Halder ,&nbsp;Pranoy Debnath","doi":"10.1016/j.istruc.2025.109091","DOIUrl":"10.1016/j.istruc.2025.109091","url":null,"abstract":"<div><div>URM Structures are highly vulnerable to seismic activities, often suffering sudden failure with significant loss of life and property. Locally sourced materials like bamboo strips can be a cost-effective solution to improve the seismic performance of unreinforced masonry (URM) walls in many developing countries. Bamboo reinforcement is explored as a sustainable and cost-effective alternative to traditional retrofitting methods, filling a gap in existing literature. This study simulates the in-plane behaviors of URM walls with varying aspect ratios and reinforcement types. The structural responses of URM walls reinforced with bamboo splints and wire mesh were simulated under lateral loading conditions using a detailed finite element model in ABAQUS. Validation of the numerical model against existing experimental data confirms the model’s accuracy in simulating URM behaviour. Results reveal that bamboo-reinforced URM walls substantially increase load-carrying capacity, with strength improvements reaching up to 100 % in certain configurations. Using sustainable materials like bamboo offers a cost-effective alternative for URM structures, enhancing resilience while minimizing environmental impact. This work underscores the potential of natural fiber reinforcements to improve the seismic performance of masonry structures, providing a viable solution for low-income communities in earthquake-prone areas. Further research is recommended to explore reinforcement configurations and optimize bamboo treatment techniques for increased durability.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109091"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908089","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}

{"title":"Seismic performance and fragility evaluation of assembly blind-bolt CFST composite frames under mainshock-aftershock sequences","authors":"Xuebei Pan ,&nbsp;Jingfeng Wang ,&nbsp;Beibei Li","doi":"10.1016/j.istruc.2025.108969","DOIUrl":"10.1016/j.istruc.2025.108969","url":null,"abstract":"<div><div>This paper highlights the importance of considering semi-rigid characteristics of blind-bolt connections when examining the seismic performance and fragility of the assembly concrete-filled steel tube (CFST) composite frame structure, with a particular focus on the influence of mainshock-aftershock sequences. The design of a nine-story blind-bolt CFST composite frame based on the energy balance-based plastic design method was first presented. The fiber-based numerical model of the frame was developed and validated against experimental results, which was used for the assessment of the rationality and robustness of the designed structure. It indicated that the frame achieved predefined seismic performance targets in terms of the inter-story drift, residual drift and joint rotation. Following this, the seismic fragility curves of the frame subjected to mainshock-aftershock sequences were developed. The results showed that the structural seismic probabilities for inter-story drift exceeding pre-designated limits of 0.2 %, 1.0 % and 2.0 % were respectively 0.54, 0.44 and 0.32, under mainshocks only scaled to frequently occurred earthquake, design basis earthquake and maximum considered earthquake levels. While the probabilities of exceeding a certain damage limit of the frame will be significantly improved, under the identical hazard levels of mainshocks followed with aftershocks. It showed the importance of considering the extra damages induced from aftershocks during the design of the blind-bolt CFST composite frame structure.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 108969"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908086","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}

{"title":"Effect of adobe wall shapes and openings on out-of-plane behavior","authors":"Fırat Kıpçak ,&nbsp;Barış Erdil","doi":"10.1016/j.istruc.2025.109090","DOIUrl":"10.1016/j.istruc.2025.109090","url":null,"abstract":"<div><div>Adobe masonry structures which are among the traditional structures, are affected by many parameters like other masonry structures. These parameters include material, workmanship, mortar, support condition, wall direction, wall slenderness and opening properties. Those parameters are important because they affect the seismic performance significantly. There are many studies in the literature considering the in-plane behavior of masonry walls; however, it has been observed after many earthquakes that most of the adobe walls collapse due to out-of-plane displacements. In order to understand the out-of-plane behavior well, this study aims to experimentally and numerically investigate the out-of-plane behavior of adobe walls having different configurations such as wall aspect ratio, wall shape and openings. The failure mechanisms, horizontal load capacity ratios and failure profiles were evaluated. In the study, a total of 18 different wall models were produced: 6 U-shaped walls with two-side support walls, 6 L-shaped walls with one-side support walls and 6 I-shaped walls without support walls. All the walls were tested on a tilting table. They were also analyzed by simplified micro modeling technique in ABAQUS software. The adobe walls were constructed in the form of interlocking pattern according to the traditional pattern. A clay and fiber mixed mortar with the same properties as the unit was used between the adobe units. According to the experimental and numerical results, it was observed that the support walls in adobe walls increased the out-of-plane wall stiffness and lateral load capacity ratio. As the wall aspect ratio increased, the lateral load capacity decreased in the models with support walls and increased in the models without support walls. Increasing wall length decreased the effectiveness of the supporting wall. Door/window openings left in the wall did not adversely affect the capacity to a great extent. The lateral load capacity/weight ratio changed slightly due to the weight reduction of the openings. The capacities and failure mechanisms obtained from the experimental and numerical studies were found to be similar.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109090"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908085","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}

{"title":"Wind-induced response prediction of coupled towers and lines of a transmission tower-line system based on an LSTM network","authors":"Guifeng Zhao ,&nbsp;Wanyun Chen ,&nbsp;Kaifeng Xing ,&nbsp;Meng Zhang ,&nbsp;Chao Sun","doi":"10.1016/j.istruc.2025.109101","DOIUrl":"10.1016/j.istruc.2025.109101","url":null,"abstract":"<div><div>Transmission tower-line systems are highly susceptible to wind loads. This study proposes a long short-term memory (LSTM)-based method to predict the wind-induced dynamic response of a transmission tower-line system. First, an LSTM model is established to predict the wind-induced nonlinear response of an individual transmission tower via wind tunnel testing data. The predicted results agree well with the measurements under various wind speeds. Despite the noise in the measurements, the LSTM model can capture the dynamic response characteristics. Second, the developed LSTM-based model is refined to predict the dynamic response of a transmission tower-line system under various wind speeds. The key novelty of the proposed method is that it can accurately predict the wind-induced nonlinear responses of transmission lines via the response of transmission towers. It is found that the proposed LSTM-based model can effectively capture the nonlinear relationship between the transmission tower and the transmission line. Quantitative analysis indicates that the overall prediction accuracy exceeds 90 %, which validates the method’s accuracy and generalization capability under different conditions. The present study offers an efficient and accurate LSTM-based method to predict the complete dynamic responses of transmission tower-line systems via limited measurements.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"77 ","pages":"Article 109101"},"PeriodicalIF":3.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908088","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}