Structures最新文献

{"title":"Interfacial constitutive model of Fe-SMA-and-steel single-lap-shear bonded joints","authors":"Yapeng Wu,&nbsp;Xu Jiang,&nbsp;Xuhong Qiang,&nbsp;Wulong Chen","doi":"10.1016/j.istruc.2025.108913","DOIUrl":"10.1016/j.istruc.2025.108913","url":null,"abstract":"<div><div>Strengthening in-service steel structures can improve operational performance and extend service life. Employing Fe-based shape memory alloys (Fe-SMA) for proactive reinforcement stands out as a highly satisfactory and safe repair solution. For Fe-SMA-and-steel bonded joints, the load-bearing capacity can reach twice the recovery stresses obtained from activating Fe-SMA. Grounded in the experimental results, the failure process, stress/strain evolution, and force transmission mechanism of bonded joints are analyzed. The loading process of bonded joints before thorough failure undergoes two stages: loading growth and debonding development. In the debonding failure process, the effective bonding length of Fe-SMA-and-steel bonded interfaces, that resists external loads, remains essentially unchanged. Based on 3 types of structural adhesives and 4 types of adhesive thicknesses, the bond-slip constitutive models of bonded interfaces are derived from the experimental bond-slip curves, and the bilinear bond-slip constitutive models, i.e., the triangular cohesive zone models, are established through simplification to facilitate engineering applications. Moreover, the theoretical calculation methods are proposed for the interfacial constitutive parameters. This research provides experimental and interfacial constitutive foundations for the numerical simulation and theoretical calculation of bonded joints, and furthermore offers guidance for practical applications of repairing steel structures by bonding Fe-SMA.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108913"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823619","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":"Automatic crack detection and segmentation of masonry structure based on deep learning network and edge detection","authors":"Yong Zhou,&nbsp;Yahui Wang,&nbsp;Ruilin Wang,&nbsp;Weiping Zhang,&nbsp;Haonan Yang","doi":"10.1016/j.istruc.2025.108850","DOIUrl":"10.1016/j.istruc.2025.108850","url":null,"abstract":"<div><div>Because of high time expense, strong experience dependence and labor intensity, traditional crack detection methods have given way to computer vision-based automatic non-destructive methods, which have been successfully applied to the crack detection of concrete structures. However, the presence of mortar joints between masonry blocks introduces considerable noise in masonry images compared to concrete images, resulting in less efficiency and accuracy of the computer vision-based methods in masonry structures. This study aims to incorporate deep learning network into computer vision to achieve rapid and accurate crack detection in masonry structures. Firstly, the GELAN-Seg network, i.e. the YOLOv9-Seg network without the Auxiliary Supervisory Branch, was improved by adding an edge processing branch to obtain the YOLO-Edge model for higher accuracy of crack segmentation. Then, low-cycle reversed loading experiments were conducted on masonry walls to collect crack images, which were further manually labelled to create a comprehensive dataset of cracks in masonry structures. To assess the effectiveness of the proposed model, the crack segmentation performance of the YOLO-Edge model was compared with GELAN-Seg, YOLOv9-Seg, Mask R-CNN, SOLOv2, YOLACT, ConvNeXt, and Swin Transformer. The results demonstrate that the proposed model can significantly improve crack segmentation accuracy with AP0.5_seg reaching 83.8 %, outperforming other models, e.g. GELAN-Seg (80.4 %), YOLOv9-Seg (81.6 %), Mask R-CNN (64.5 %), ConvNeXt (70.0 %), YOLACT (67.9 %), Swin Transformer (68.5 %) and SOLOv2 (80.7 %). Additionally, the proposed model has smaller parameters, and thus less computation and higher detection speed than other models. These findings confirm the efficacy of the YOLO-Edge model in the crack detection for masonry structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108850"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823622","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":"Development and seismic performance assessment of welded connections in modular steel structures for high-rise buildings","authors":"Ben Mou ,&nbsp;Siqi Li ,&nbsp;Haitao Song ,&nbsp;Chenglong Wu ,&nbsp;Xiujun Wang ,&nbsp;Zhen Zhu ,&nbsp;Hao Yu","doi":"10.1016/j.istruc.2025.108919","DOIUrl":"10.1016/j.istruc.2025.108919","url":null,"abstract":"<div><div>Modular steel structures are characterized by rapid construction, high quality, reduced labor requirements, and flexible layouts. Ensuring the seismic performance of inter-module connections is critical for structural safety. This study investigates the seismic behavior of novel modular steel frame joints (MSFJs) through low-cycle reciprocating load tests on three full-scale specimens. The effects of outer sleeve height and thickness on key seismic performance indicators—including failure modes, stress response, ductility, energy dissipation, and stiffness—are systematically evaluated. Experimental results revealed that MSFJs primarily exhibited bending failure at beam ends, with most failures occurring at welds between beam flanges and column ends. The hysteresis curves were full, with peak equivalent viscous damping coefficients (<em>h</em>_e) reaching 0.15, indicating strong energy dissipation. MSFJs underwent four stress stages: initial slipping, elastic deformation, elastic-plastic deformation, and failure. The height and thickness of the outer sleeve had minimal impact on peak load-bearing capacity and ductile deformation. The residual deformation curve showed a two-stage trend with stable performance degradation and a strength degradation coefficient (<em>λ</em>_i) between 0.90 and 1.00. Overall, MSFJs demonstrated semi-rigid, partial-strength joint behavior, providing valuable insights for the seismic design and optimization of modular steel structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108919"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823620","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":"Axial compression experimental on T-section special-shape light-weight foam concrete-filled cold-formed steel built-up columns","authors":"Luyu Wang ,&nbsp;Yi Hu ,&nbsp;Liqiang Jiang ,&nbsp;Shizhong Zhou ,&nbsp;Da Wang ,&nbsp;Hongyu Sun","doi":"10.1016/j.istruc.2025.108911","DOIUrl":"10.1016/j.istruc.2025.108911","url":null,"abstract":"<div><div>This paper proposes T-section special shape light-weight foam concrete-filled (FCF) cold-formed steel (CFS) built-up columns, which can be used as the side columns that easily connect CFS shear walls from three directions. Light-weight foam concrete was used to mitigate the buckling failure and to increase loading capacity of the columns. Axial compression tests were conducted on four hollow columns and six FCF-CFS columns, and the failure modes as well as the buckling mechanisms of these specimens are analyzed. Finally, the codes from different countries are used to predict the ultimate capacity of these specimens. The results show that (1) the ultimate capacity of the specimens increased to 37.0∼294.5 % if 10 MPa FCF was used, and the improvement was 70.8∼170.7 % if 6 MPa FCF was used; (2) the FCF mitigated local buckling of the specimens and improved their ductility, however, the final failure modes did not obviously change; (3) although the GB50018–2002 and the AISI-S100 can effectively calculate the ultimate capacity of the hollow specimens, almost all codes cannot accurately predict the ultimate capacity of FCF-CFS specimens due to the complex behavior between the built-up special-shape section and FCF. The results provide insights for performance enhancement of columns in CFS structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108911"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823706","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":"Mechanical behavior of coral concrete-filled aluminum alloy square tube columns subjected to eccentric loading","authors":"Jiasheng Jiang ,&nbsp;Yumei Wang ,&nbsp;Zhiheng Deng ,&nbsp;Junjie Yu ,&nbsp;Haifeng Yang ,&nbsp;Yuhe Dong ,&nbsp;Zongyuan He","doi":"10.1016/j.istruc.2025.108907","DOIUrl":"10.1016/j.istruc.2025.108907","url":null,"abstract":"<div><div>Coral aggregate concrete (CAC), a composite material consisting of coral aggregates, ordinary Portland cement, and seawater, demonstrates significant potential for application in island buildings. However, the use of seawater introduces corrosive ions such as Cl^- and SO₄^2- into CAC, leading to the corrosion of reinforcement. In recent years, the integration of CAC with aluminum alloy square tubes has emerged as an improved anti-corrosion strategy due to the excellent corrosion resistance of aluminum alloy. In this study, 15 CAC-filled aluminum alloy square tube columns (CCAT) were fabricated, considering three concrete strengths (C20, C30, and C40), three eccentricities (<em>e</em> = 20 mm, 40 mm, and 60 mm), and three tube thicknesses (<em>t</em> = 2 mm, 4 mm, and 6 mm). The ultimate bearing load, ductility, and stiffness were investigated in relation to these variables, respectively. Additionally, a finite element analysis (FEA) model was developed to simulate the eccentric compressive behavior of CCAT, and a new eccentric bearing capacity model was proposed. The results indicated that increasing the aluminum alloy tube thickness enhanced the ultimate bearing load and stiffness, while increasing the eccentricity reduced both stiffness and bearing capacity. Furthermore, the findings were validated through FEA, and 12 extended analysis results were also presented. A novel bearing capacity model, incorporating equivalent constraint theory, was established. This model demonstrated accurate predictions compared to existing code models.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108907"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823707","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":"Out-of-plane flexural behaviour of AAC masonry walls reinforced using steel wire mesh integrated within the masonry bed and bed-head joint","authors":"Richard Badonbok Lyngkhoi,&nbsp;Teiborlang Warjri,&nbsp;Comingstarful Marthong","doi":"10.1016/j.istruc.2025.108897","DOIUrl":"10.1016/j.istruc.2025.108897","url":null,"abstract":"<div><div>Autoclaved aerated concrete (AAC) masonry walls are vulnerable during seismic events due to their inherent brittleness, low toughness, low tensile strength, and susceptibility to out-of-plane loading. This study investigates an economical approach to enhance the lateral resistance and ductility of AAC masonry walls by embedding steel wire mesh within the masonry mortar bed joint, as well as the bed and head joint. Three different types of steel wire mesh and three reinforcing arrangements were evaluated for each approach. The (-) arrangement aligns the mesh width with the masonry width. The (L) arrangement involves attaching the mesh such that one side extends beyond the masonry mortar width, bending it to affix to the masonry face, forming a letter L shape. The (Z) arrangement showcases the mesh extending beyond both faces of the masonry width; one section is bent to rest on the masonry bottom face while another is bent and rests on the masonry top face, forming a letter Z shape<strong>.</strong> The results demonstrated a significant improvement in flexural capacity of the masonry, with the bed joint configuration outperforming the bed-head joint configuration. Among the reinforcement arrangements, the (Z) arrangement exhibited higher performance, followed by the (L) and (-) arrangement. Additionally, steel wire mesh with higher tensile strength demonstrates better performance, highlighting the critical role of the material property in the reinforcing efficiency. The analytical prediction based on a developed model were in reasonable agreement with the experimental outcomes. These findings highlight the practical significance of steel wire mesh reinforcement in enhancing the seismic resilience of AAC masonry structure.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108897"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823769","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 parametric analysis of replaceable link with corrugated web plates: Plastic rotation and overstrength","authors":"Shen Li,&nbsp;Shuo Tian,&nbsp;Xiaolei Li,&nbsp;Ningjun Du","doi":"10.1016/j.istruc.2025.108908","DOIUrl":"10.1016/j.istruc.2025.108908","url":null,"abstract":"<div><div>This study proposes a replaceable link with a corrugated web for traditional eccentrically braced steel frames and focuses on the impact of key parameters on the seismic performance of the corrugated web replaceable link. The numerical analysis model was established by an ABAQUS software, and the finite element analysis results were compared and analyzed with experimental results to validate the effectiveness of finite element numerical simulation. A parametric analysis was conducted on 24 finite element models, examining the influence of parameters such as the link length (<em>e</em>), web thickness (<em>t</em>_w), corrugation parameter <em>θ</em> (the inclination angle of the inclined plate strip in the ripple), and <em>a</em> (the width of the flat plate strip in the ripple) on the performance of the replaceable link. The analysis indicates that the maximum plastic rotation γ_pmax of the specimen is approximately 0.08 rad. At the same time, as the thickness of the web and the corrugation parameter <em>θ</em> increase, the overstrength coefficient of the model continues to rise. Conversely, the overstrength coefficient of the model decreases with a reduction in the length ratio, indicating that models with smaller length ratios exhibit better overstrength behavior. The research findings offer significant insights into the seismic performance and strength of replaceable links featuring corrugated web plates, highlighting their practical applications in engineering.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108908"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823708","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":"Axial compression behavior of double-skin tubular-encased confined-concrete bar columns","authors":"Ruofan Gao ,&nbsp;Zhi Sun ,&nbsp;Jiaqi Liu ,&nbsp;Bing Fu ,&nbsp;Hong Yuan","doi":"10.1016/j.istruc.2025.108880","DOIUrl":"10.1016/j.istruc.2025.108880","url":null,"abstract":"<div><div>Fiber-reinforced polymer (FRP) composites have been widely used with other conventional construction materials (e.g., steel and concrete) to form novel new structural members, in which the advantages of each component can be fully utilized. This paper proposed a variant form of double-skin tubular columns (i.e., double-skin tubular-encased confined-concrete bar columns (DTCBCs)), which is composed of an outer steel tube, an inner steel tube, multiple small-diameter concrete-infilled glass FRP (GFRP) tubes and mortar that fills the spaces between these tubes. In order to justify the advantages of the proposed hybrid columns, a series of axial compression tests were conducted on seven DTCBCs along with a double steel tube hollow column as the control specimen with three key parameters being examined. An advanced finite element (FE) model has then been proposed and validated through the test results obtained in this study in various terms. The test results indicate that the DTCBCs exhibit with the load carrying capacity and deformability higher than its DSTC counterpart by up to 73.62 % and 1.8 times. The proposed FE model is able to produce precise predictions for DTCBCs and provide detailed information on the stress and strain distributions of the constituent components of the DTCBCs.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108880"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823763","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 response of soft-story reinforced concrete frames: Challenging traditional collapse mechanisms","authors":"Ruofan Luo ,&nbsp;A. Lata ,&nbsp;Xiaoyao Dong ,&nbsp;Bo Wang ,&nbsp;Ziwei Luo ,&nbsp;Yongduo Liang ,&nbsp;Xun Guo","doi":"10.1016/j.istruc.2025.108894","DOIUrl":"10.1016/j.istruc.2025.108894","url":null,"abstract":"<div><div>Destructive earthquakes frequently inflict considerable damage on multistory buildings, with reinforced concrete (RC) frame structures being particularly susceptible. Although the “strong column-weak beam” principle is a common design approach, post-earthquake investigations reveal that failures rarely follow this mode, with damage often concentrated in vertical load-bearing components like wall-column systems instead of beams. This discrepancy raises concerns about the adequacy of current design approaches and highlights the complex interactions between columns, walls, and other structural elements during seismic events. This study aims to investigate the seismic response and collapse mechanisms of soft-story RC frames, emphasizing column behavior, axial compression ratios, and the performance of buildings with soft stories. To achieve this, a shaking table test was conducted on scaled-down RC frame columns, and numerical simulations were developed to analyze displacement responses under varying axial compression ratios and seismic accelerations. Experimental results indicate that bare columns demonstrate considerable deformation capacity, characterized by pronounced shifts in natural frequency during seismic loading. Numerical simulations show that buildings with open first stories exhibit low axial compression ratios, which result in minimal second-order gravity effects and substantial displacement margins. These characteristics reduce the risk of collapse even under high seismic accelerations. The findings suggest that soft-story RC frames, designed based on the story-yield mechanism, exhibit greater collapse resistance than anticipated. For the majority of multi-story buildings, the axial load ratio generally remains below 0.3 when calculated using realistic loading conditions and material strengths. Under these circumstances, the collapse drift ratio can reach values as high as 1/16 or greater. In contrast, the maximum drift ratio observed under a seismic input of 1.0 g is significantly lower, reaching only 1/36. Moreover, building collapse typically involves complex component failure modes with varying structural characteristics, deviating from uniform patterns predicted by traditional design theories. This study provides new insights into the seismic performance and failure mechanisms of multistory frames with soft stories, offering valuable guidance for improving seismic design codes and enhancing the resilience of these structures under earthquake loading.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108894"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823801","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":"Research on the shear performance of groove-reserved prefabricated steel-concrete composite slab-beam connection","authors":"Ningjie Dai ,&nbsp;Lilong Fan ,&nbsp;Xin Nie ,&nbsp;Feizhi Xiao ,&nbsp;Liangdong Zhuang","doi":"10.1016/j.istruc.2025.108873","DOIUrl":"10.1016/j.istruc.2025.108873","url":null,"abstract":"<div><div>The groove-reserved slab-beam connection offers advantages such as high degree of prefabrication, good overall mechanical performance, and ease of construction, making it one of the most optimal solutions for building prefabricated composite beams. The construction process of this structure is as follows: steel beams with shear connectors and concrete slabs with reserved grooves on the underside are prefabricated in the factory, and after being transported to the construction site, the slab-beam connection is completed by pouring concrete into the grooves of the precast slabs. Existing studies on the shear performance and optimal design of groove-reserved slab-beam connections remain insufficient, limiting their practical application. To address this, five full-scale push-out tests were conducted, and finite element models of structures with new-to-old concrete interfaces were developed. The calculation results from design formulas in relevant codes were compared. The results indicate that when designing the shear capacity of this connection structure, both the shear capacity of the new-to-old concrete interface and the shear connectors should be simultaneously verified. Using Ultra-High-Performance Concrete instead of Shrinkage-Compensating Concrete as post-cast concrete increases the shear capacity of the new-to-old concrete interface by 9 %, while incorporating key-tooth structures at the grooves enhances the shear capacity by 13 %. Additionally, the effects of shear rebar quantity, interface roughness, and pre-compression force on the shear capacity of the new-to-old concrete interface were investigated.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"76 ","pages":"Article 108873"},"PeriodicalIF":3.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823705","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}