Thin-Walled Structures最新文献

{"title":"Elastic lateral-torsional buckling of single-span doubly symmetric I-section beams with intermediate discrete lateral support considering prebuckling deflections","authors":"Ghaith A. Abu Reden,&nbsp;Sandor Adany","doi":"10.1016/j.tws.2025.113179","DOIUrl":"10.1016/j.tws.2025.113179","url":null,"abstract":"<div><div>In this paper the elastic lateral-torsional buckling of simple beams is investigated. The beams are single-span, the cross-sections are doubly symmetric, the beam is subjected to uniform moment. Moreover, the middle cross-section is laterally supported by a rigid support, the position of which varies within the cross-section. In the investigations, the effect of prebuckling deflections is considered. First, the critical moments are obtained by an iterative linear buckling analysis, completed by the finite element method, using both beam and shell finite elements. Analytical solutions are provided, too, and the results from finite element computations and from analytical formulae are compared. The numerical and analytical results show good coincidence. The results prove that the critical moment can efficiently be calculated by classic numerical methods, even if the effect of prebuckling deflection is considered. The existing literature suggests that the critical moment increase due to prebuckling deflections is influenced primarily by the ratio of minor-to-major moment of inertia, however, the presented results show that when the beam is laterally supported in the middle, the type and position of the lateral support as well as the beam length has important effect, too. Depending on these parameters, the critical moment values show a significant scatter, and the values with and without considering the prebuckling effect can be strongly different. Moreover, the suggestion from previous literature that the prebuckling effect is positive, cannot be justified in general. The experienced tendencies can be explained by the buckling shapes, as proved in the paper.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113179"},"PeriodicalIF":5.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143635824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of LSF truss floor-ceiling systems made of top hat sections","authors":"Gihan Ranasinghe ,&nbsp;Son Tung Vy ,&nbsp;Mahen Mahendran ,&nbsp;Anthony Ariyanayagam","doi":"10.1016/j.tws.2025.113193","DOIUrl":"10.1016/j.tws.2025.113193","url":null,"abstract":"<div><div>Light gauge steel framed (LSF) floor-ceiling systems, which employ cold-formed steel (CFS) joists, offer high strength, fast construction and cost-effectiveness. CFS trusses are examples of such joists with several advantages over conventional lipped channel joists. However, limited research exists on LSF truss floor-ceiling systems made of top hat sections, despite their popularity. This study addressed this gap by examining the flexural behaviour of LSF truss floor-ceiling systems made of top hat sections through a series of four-point bending tests. The experiments were conducted with variations in support conditions, truss configurations, top hat thickness, and the types of fasteners used in web-to-chord connections. Test results highlighted the complex failure mechanisms of top hat trusses, including early local buckling failures at the removed lips and edge stiffeners near the ends of diagonal web members. The use of nylon spacers and additional screws to the bolt connections proved effective in delaying early web member failures. Tested trusses did not fail abruptly, instead, the loads were redistributed to other members, resulting in higher ultimate failure loads. A comparison with the current truss design method which is based on elastic analysis to determine member forces and the direct strength method (DSM) to calculate member capacities showed that this approach overestimates the truss failure loads, particularly where web-to-chord connections had only one bolt. This research underscores the need to consider combined compression-bending actions when designing web members with eccentric connections and to strengthen these connections to prevent or delay early local buckling failures. It also highlights the importance of considering the unlipped portion of web members at connections when designing top hat trusses and provides design recommendations for top hat truss floor systems.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113193"},"PeriodicalIF":5.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Collapse behavior and resistance mechanisms of steel modular buildings with corrugated walls: experimental, numerical, and analytical insights","authors":"Jing-Zhou Zhang ,&nbsp;Xiao Lin ,&nbsp;Wen-Jin Zhang ,&nbsp;Zhi-Wei Yu","doi":"10.1016/j.tws.2025.113157","DOIUrl":"10.1016/j.tws.2025.113157","url":null,"abstract":"<div><div>This paper investigates the collapse behavior and resistance mechanisms of steel modular buildings (SMBs) with corrugated steel walls under the scenario of two edge module loss. The study employs experimental methods to examine critical aspects of the specimen, including failure modes, load-displacement behavior, wall deformations, structural component displacements, and strain development in beams and columns. A validated finite element model is utilized to further explore the contributions of wall panels to structural collapse resistance and to evaluate the influence of wall corrugation configurations on the load-bearing capacity of SMBs. Based on the experimental findings, a simplified analytical method is proposed to estimate the specimen's peak load. The results indicate that the load-displacement response progresses through four distinct stages, with the peak load reaching approximately 2.2 times the yield load. After wall failure, the structural resistance initially decreases but subsequently recovers due to the catenary action in the short module beams. The final failure mode is characterized by the separation of the short wall panel from the module frame, tensile failure in the long wall panel, and flange fracture in the short beam. During large deformations, compression between the two adjacent long beams results in a final relative displacement of approximately 12 mm. Both short and long wall panels contribute significantly to the collapse resistance during small deformations, each accounting for over 40%. However, as displacement increases, the short wall panel's contribution becomes dominant due to the stronger restraints provided by the module frame.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113157"},"PeriodicalIF":5.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of the debris clouds produced by hypervelocity oblique impact of spherical projectiles on honeycomb sandwich shields","authors":"Ying Chen ,&nbsp;Qi-Guang He ,&nbsp;Qun-Yi Tang ,&nbsp;Lv-Tan Chen ,&nbsp;Xiao-Wei Chen","doi":"10.1016/j.tws.2025.113192","DOIUrl":"10.1016/j.tws.2025.113192","url":null,"abstract":"<div><div>The protective capabilities of honeycomb sandwich shields are closely related to their unique core structure. When a projectile obliquely impacts the shield at hypervelocity, the radial multilayer foils can effectively break the projectile through multiple impacts, thereby reducing the impact momentum of the debris on the rear panel and absorbing the main impact energy. In this study, we employed the finite element-smooth particle hydrodynamics adaptive method to replicate experiments on the oblique hypervelocity impacts of spherical projectiles on homogeneous aluminum plates and honeycomb sandwich shields. Based on both the experimental and simulation results, we described the evolution of the debris cloud. In addition, we analyzed the distribution characteristics of the debris cloud and modeled the structural characteristics corresponding to the oblique impacts of spherical projectiles on different protective structures. We also analyzed how the honeycomb core influences the debris cloud during oblique impact to define the failure modes of the front and rear panels as well as the honeycomb core materials. Furthermore, we define the different stages in which damage occurs and examine the response processes for the honeycomb sandwich shields. These findings can serve as a reference for optimizing the design of protective structures.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113192"},"PeriodicalIF":5.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A stochastic multiscale asymptotic homogenization approach to 3D printed biodegradable resin TPMS bio-inspired structures","authors":"Tien-Dat Hoang ,&nbsp;Thinh H. Ngo ,&nbsp;Kim Q. Tran ,&nbsp;Shaofan Li ,&nbsp;H. Nguyen-Xuan","doi":"10.1016/j.tws.2025.113100","DOIUrl":"10.1016/j.tws.2025.113100","url":null,"abstract":"<div><div>Gyroid (G), Primitive (P), and IWP porous structures, belonging to the category of complex triply periodic minimal surface (TPMS) architectures, have diverse applications across various scientific and technological fields. These intricately designed structures, inspired by biological architectures, are increasingly gaining attention in 3D printing because they fulfill the biological and mechanical requirements necessary for natural reconstruction. This paper promotes a novel computational framework for TPMS structures using a stochastic multiscale homogenization (SMH) method, which not only effectively predicts the homogenized engineering constants, microscopic strains, and damage propagation, but also accounts for their natural uncertainties. For computing a nonlinear problem on a standard desktop computer, the preconditioned element-by-element scaled conjugate gradient (EBE-SCG) method has been used to solve these stochastic models, particularly for intricate TPMS structures. To demonstrate the effectiveness of the present approach, the behaviors of the three above TPMS types with different layer levels, ranging from one to three within the same cell size, are automatically designed, formulated, and analyzed using an in-house Fortran code. This is a first attempt to demonstrate that the simulated stochastic homogenization predictions closely align with the experimental compressive Young’s modulus and damage behaviors of 3D-printed TPMS specimens made from a biodegradable resin, polyamide (PLA), using a vat photopolymerization printing process. The relative errors in the mean values, ranging from 2.45 to 11.25%, are attributed to uncertainties in the printed models involving small uncertainties. Notably, the stochastic approach effectively captures both the uncertainty and the probabilistic nature of the mechanical properties, with measured values falling within the predicted distributions. Moreover, this research framework enables more efficient design and fabrication of TPMS-based bio-inspired structures with potential applications in mechanical, civil, aerospace, engineering, etc., especially biomedical engineering.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113100"},"PeriodicalIF":5.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143635820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and numerical study on lateral-torsional buckling of welded QN1803 high-strength stainless steel I-girders","authors":"Youtian Wang ,&nbsp;Boshan Chen ,&nbsp;Peng Dai ,&nbsp;Yuanqing Wang ,&nbsp;Yuchen Song ,&nbsp;Ke Jiang ,&nbsp;Letian Hai","doi":"10.1016/j.tws.2025.113190","DOIUrl":"10.1016/j.tws.2025.113190","url":null,"abstract":"<div><div>Recently, high-strength stainless steel, known as QN1803, has gained popularity in the steel industry due to its lower nickel content, approximately 2.0 %, which makes it more cost-effective than traditional EN 1.4401 stainless steel. The moment capacities of such thin-walled I-girders are influenced by lateral-torsional buckling when they are not laterally restrained adequately. However, existing studies have not yet investigated the lateral-torsional buckling behaviour of such I-girders. This issue is addressed in this study. An experimental program was conducted, reporting a total of six experimental results. Traditional four-point bending tests were performed to measure the displacement versus load relationship at the mid-span. An advanced numerical model considering the initial geometric imperfection and residual stresses was established and calibrated against the test results the authors and other researchers reported. Subsequently, a parametric study including 66 finite element models was undertaken. The test results indicated that the lateral-torsional buckling strength of QN1803 high-strength stainless steel I-girders increased by 35 % on average compared to commonly used EN 1.4401 stainless steel I-girders. The obtained test and parametric study results were further used to evaluate the design methods outlined in Australian Standard AS4100 (2016), European code EN 1993–1–1 (2023) and American Standard AISC 360–22 (2022). The comparison revealed that the current design specifications are inadequate for accurately predicting the lateral-torsional buckling strength of such I-girders.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113190"},"PeriodicalIF":5.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous topology, configuration, and prestress optimization for lightweight design of modular tensegrity chain structures","authors":"Yongcan Dong ,&nbsp;Xingfei Yuan ,&nbsp;Xin Wang ,&nbsp;Akram Samy ,&nbsp;Shuo Ma ,&nbsp;Shilin Dong","doi":"10.1016/j.tws.2025.113184","DOIUrl":"10.1016/j.tws.2025.113184","url":null,"abstract":"<div><div>Lightweight design has emerged as a valuable research focus in tensegrity structures, gaining increasing attention across various engineering domains that prioritize weight reduction. While many existing studies have concentrated on the lightweight design of conventional tensegrity structures, relatively little attention has been paid to those derived from modular assembly. This study focuses on a specific type of modular tensegrity chain structure (TCS) and presents a comprehensive framework for its lightweight design. The proposed framework innovatively integrates three critical design aspects: prestress determination, configuration design, and topology optimization, while simultaneously accounting for various design constraints under both prestress and load states. This framework is formulated as a bilevel optimization model. Prestress optimization is first performed at the internal level and then incorporated into the external-level model for configuration design and topology optimization. Subsequently, improved hybrid algorithms are also introduced to solve the optimization problem. Three representative numerical examples are provided to validate the effectiveness of the proposed framework and solving algorithms. The results demonstrate that this comprehensive approach achieves significant mass reduction compared to single-aspect designs. The proposed framework offers a more holistic and efficient solution for lightweight TCS design, showcasing its potential for enhancing the performance and efficiency of modular tensegrity structures in engineering applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113184"},"PeriodicalIF":5.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A deep learning approach to impact localization and uncertainty assessment in CFRP composites using sparse PZTs: Integrating experiments and simulations","authors":"Huai Yan,&nbsp;Weihua Xie,&nbsp;Bo Gao,&nbsp;Fan Yang,&nbsp;Songhe Meng","doi":"10.1016/j.tws.2025.113143","DOIUrl":"10.1016/j.tws.2025.113143","url":null,"abstract":"<div><div>The propagation of elastic waves in CFRP composites is dispersive and multimodal, making impact localization using wave signals challenging. An end-to-end deep learning model with an encoder-decoder architecture was developed for impact localization in CFRP composites, using sparse piezoelectric ceramic transducer (PZT) arrays and a data-driven approach to enable online impact sensing. The model used a segmented training strategy and transfer learning to capture shared features between experimental and simulated data. According to the piezoelectric equation, it links experimental piezoelectric signals with simulated stress responses. The results show that the feature encoder trained can extract their shared features effectively. Meanwhile, the model successfully applied the laws from simulation data to the localization of experimental impacts based on the fine-tuning strategy, alleviating the challenge of limited experimental data. The prediction results in the test set show that good generalization, and impact localization can be achieved in milliseconds during inference. The average error in localization is only 3.42 mm over a 100 mm × 100 mm monitoring area. Compared to the traditional transfer strategy, the three-stage training proposed shows better generalization by constraining the encoded features. In addition, the Monte-Carlo dropout strategy is used to assess prediction uncertainty, analyzing the effects of dropout rate and repeated predictions on confidence intervals. The study provides a prospective solution for large CFRP structures to achieve fast localization of impacts under sparse PZT arrays.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113143"},"PeriodicalIF":5.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical, experimental and numerical studies of a novel tension-compression bolt (TCB) for single-sided beam-column joints","authors":"Yulong Feng ,&nbsp;Cheng Han ,&nbsp;Wensu Chen","doi":"10.1016/j.tws.2025.113172","DOIUrl":"10.1016/j.tws.2025.113172","url":null,"abstract":"<div><div>Single-sided beam-column joints can minimize damage to the floor slab by avoiding the opening at the top flange. However, they face the challenge of limited restorative capacity, as unidirectional self-centering components cannot effectively resist both opening and closing actions at the bottom flange. Therefore, this study proposes a novel tension-compression bolt (TCB) that is a bidirectional self-centering component. It consists of a high-strength bolt for applying preload, a disc spring set to enhance deformation capacity, and a pair of sleeves that provide tension-compression functionality. In this study, theoretical analysis of the TCB is derived regarding load-displacement relationship and the TCB design process is proposed. After that, experimental study of the TCB is conducted to investigate its tension-compression performance as well as the effects of the disc spring set and sleeve on the performance. In addition, numerical simulations are conducted using detailed and simplified modelling methods for the TCB tests, and the influence of machining inaccuracies on the performance is assessed. Subsequently, a case study of beam-column joints incorporated with the TCB is numerically conducted. The proposed TCB demonstrates an enhanced tension-compression performance with sound energy-dissipating capacity, providing an effective solution for single-sided beam-column joints used in resilient structures to enable rapid restoration of functionality after earthquakes.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113172"},"PeriodicalIF":5.7,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel concrete-filled steel square tubular columns stiffened with semi-circles: Concept and behaviour","authors":"Shuai Li ,&nbsp;Faqi Liu ,&nbsp;Tak-Ming Chan ,&nbsp;Hua Yang ,&nbsp;Ben Young","doi":"10.1016/j.tws.2025.113188","DOIUrl":"10.1016/j.tws.2025.113188","url":null,"abstract":"<div><div>A novel concrete-filled steel tubular (CFST) column with semi-circular stiffeners welded in the inner side of the square tube is proposed in this study. The semi-circular stiffeners are developed based on the confinement mechanism in square CFST columns and aim to strengthen the confinement effect on concrete in the whole cross-section area, therefore improving the overall structural performance of the composite columns. The section is also flexible to use different grades of concrete in the core and cell regions. Experimental investigation on axial compressive behaviour of the semi-circle stiffened concrete-filled steel tubular (SCS-CFST) columns was carried out. High strength steel Q690 and two concrete grades C40 and C90 were adopted for the test specimens. Various parameters including steel tube thickness, cross-section slenderness, combination of different concrete grades as well as semi-circular stiffener size were investigated. Results showed that the semi-circular stiffeners were effective resist local buckling of the square tubes. SCS-CFST columns, particularly for those with C40 infilled in the core region and C90 infilled in the cell regions, presented significantly enhanced compressive strength and ductility compared to the corresponding normal unstiffened CFST columns. The applicability of existing design equations in European, American and Chinese standards was evaluated for the novel SCS-CFST columns. A new design approach that could more accurately consider the confinement effect in different regions was proposed and exhibited good performance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113188"},"PeriodicalIF":5.7,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}