Thin-Walled Structures最新文献_第3页

Mechanics of finite nonlinear viscoelastic growth for soft biological tissues

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-02-01 DOI: 10.1016/j.tws.2025.112996

Nasser Firouzi , Rinaldo Garziera , Gerhard A. Holzapfel , Timon Rabczuk

{"title":"Mechanics of finite nonlinear viscoelastic growth for soft biological tissues","authors":"Nasser Firouzi , Rinaldo Garziera , Gerhard A. Holzapfel , Timon Rabczuk","doi":"10.1016/j.tws.2025.112996","DOIUrl":"10.1016/j.tws.2025.112996","url":null,"abstract":"<div><div>Many soft biological tissues have a kind of rubbery properties and behave viscoelastic. The main difference between soft biological tissues and rubber-like materials is that they can grow. Studying the growth of these structures is challenging due to their properties. The aim of this study is to develop a computer program and a framework for the finite nonlinear viscoelastic growth of soft body parts such as arteries, skin, intestines and aneurysms, considering a Newtonian fluid for the viscoelastic branches. To deal with nonlinear relationships, a membrane FE formulation is used throughout the total Lagrangian framework. The general formulas work for different types of materials, both isotropic and anisotropic. To solve the equations for how the internal variables for growth and the viscoelastic branches change over time, two implicit Euler-backward methods are used. To see whether the model works correctly, we compare the numerical results with experimental data on skin and artery growth. The numerical results show that the described framework can accurately predict the experimental findings. In addition, the model allows us to study different shapes of biostructures such as intestinal growth and aneurysm growth. This study may serve as a benchmark for a better understanding of the complex phenomena in the biomechanics of growth.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 112996"},"PeriodicalIF":5.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182035","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}

引用次数: 0

Comparative analysis of damage and energy absorption mechanisms in various plain-weave fiber reinforced composites under multi-angle low-velocity impact 多角度低速冲击下各种平纹纤维增强复合材料的损伤和能量吸收机制对比分析

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-02-01 DOI: 10.1016/j.tws.2025.113040

Tiantong Lv , Bingxian Yuan , Yufan Liu , Dengfeng Wang

{"title":"Comparative analysis of damage and energy absorption mechanisms in various plain-weave fiber reinforced composites under multi-angle low-velocity impact","authors":"Tiantong Lv , Bingxian Yuan , Yufan Liu , Dengfeng Wang","doi":"10.1016/j.tws.2025.113040","DOIUrl":"10.1016/j.tws.2025.113040","url":null,"abstract":"<div><div>This study investigates the impact resistance and damage mechanisms of plain-weave Carbon, Glass, Kevlar, and Basalt fiber-reinforced polymers (FRPs) under multi-angle low-velocity impacts (LVIs). Utilizing a novel multi-angle impact fixture designed to ASTM D7136 standards and non-destructive ultrasonic imaging, we experimentally evaluated LVI behavior at various oblique angles. Numerical simulations incorporating a 3D Hashin failure model and cohesive zone modeling provided detailed insights into damage and energy absorption mechanisms. Results reveal significant differences in crack patterns, internal damage, and mechanical responses across FRPs as impact angles shift from normal to oblique. The analysis indicates that normal and bending properties dominate at higher angles, while tangential properties become crucial at lower angles. Statistical analysis identified correlations between impact angle, material properties, and LVI responses. Impact angle significantly affects peak impact force, maximum deformation, impact duration, and energy absorption, with the most pronounced effect on impact duration. Interlaminar material properties primarily influence peak impact force and energy absorption, whereas in-plane material properties decisively impact all four responses. This comprehensive analysis enhances the understanding of how fiber type and impact angle affect FRP behavior under more practical impact conditions.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113040"},"PeriodicalIF":5.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182601","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}

引用次数: 0

Design, fabrication and mechanical properties of an auxetic cylindrical sandwich tube with improved energy absorption

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-02-01 DOI: 10.1016/j.tws.2025.113036

Xiao Ji, Yi Zhang, Wei Zhong Jiang, Jun Wen Shi, Yi Chao Qu, Meng Li Xue, Xin Ren

{"title":"Design, fabrication and mechanical properties of an auxetic cylindrical sandwich tube with improved energy absorption","authors":"Xiao Ji, Yi Zhang, Wei Zhong Jiang, Jun Wen Shi, Yi Chao Qu, Meng Li Xue, Xin Ren","doi":"10.1016/j.tws.2025.113036","DOIUrl":"10.1016/j.tws.2025.113036","url":null,"abstract":"<div><div>Recently, the combination of sandwich structures and auxetic structures has been extensively researched, because of its excellent mechanical properties. However, there has been limited research on sandwich structures designed as cylindrical sandwich tubes. Therefore, this paper proposes a cylindrical sandwich tube filled with elliptical perforated auxetic structure (CSTE), and uses a cylindrical sandwich filled with double-arrowed auxetic structure (CSTD) as a comparison. The results indicate that CSTE exhibits superior energy absorption capacity and higher load-bearing capacity. Additionally, the elliptical perforated auxetic core layer alters the distribution of the original energy absorption contribution rate in CSTD. Moreover, parametric analysis is conducted using the experimentally validated model to investigate the influence of various parameters on the mechanical properties of CSTE. The results show that an increase in the hollow section ratio is most effective in increasing the stiffness of CSTE, and the radius thickness ratio plays a dominant role in the energy absorption capacity. Furthermore, when the ratio of the major and minor axis of an ellipse is 1.88, the energy absorption capacity of the CSTE is significantly enhanced. These findings can facilitate the application of cylindrical sandwich tubes in protective engineering.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113036"},"PeriodicalIF":5.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143323032","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}

引用次数: 0

Thin-walled box metabeam with graded 2DOF resonators for ultra-broadband complete flexural vibration suppression

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-31 DOI: 10.1016/j.tws.2025.113023

Zhexing He , Gaoge Liang , Quanxing Liu , Yongqiang Li , Yong Xiao

{"title":"Thin-walled box metabeam with graded 2DOF resonators for ultra-broadband complete flexural vibration suppression","authors":"Zhexing He , Gaoge Liang , Quanxing Liu , Yongqiang Li , Yong Xiao","doi":"10.1016/j.tws.2025.113023","DOIUrl":"10.1016/j.tws.2025.113023","url":null,"abstract":"<div><div>Traditional vibration suppression structures often struggle to achieve a balance between high load-bearing capacity and effective low-frequency vibration suppression performance. This study proposes a metabeam constructed by attaching graded two-degree-of-freedom (2DOF) local resonators to a host thin-walled box beam with high load-bearing capacity. Unlike conventional metabeams that involve the external attachment of resonators, the 2DOF resonators considered in this study can be simply embedded within the box beam, thereby conserving space. By utilizing the spectral element method (SEM), which provides exact solutions in the spectral domain, we analytically demonstrate that the 2DOF resonator is helpful to achieve a wider vibration reduction band than the conventional single-degree-of-freedom (SDOF) resonator. Based on a comprehensive parametric analysis, a metabeam with graded 2DOF resonators is designed and fabricated. Experimental measurements confirm that the metabeam can achieve ultra-broadband low-frequency flexural vibration suppression under multi-directional excitation. Notably, the vibration attenuation bandwidth of the proposed metabeam with graded 2DOF resonators is approximately twice that of a conventional metabeam with periodic SDOF resonators.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113023"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143348645","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}

引用次数: 0

Preparation and quasi-static compressive behavior of fiber-reinforced truncated conical shells

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-31 DOI: 10.1016/j.tws.2025.113035

Guanghui Deng , Liming Chen , Shaowei Zhu , Zhaoxin Yun , Hangyu Fan , Yong Chen , Xianbo Hou , Tao Liu

{"title":"Preparation and quasi-static compressive behavior of fiber-reinforced truncated conical shells","authors":"Guanghui Deng , Liming Chen , Shaowei Zhu , Zhaoxin Yun , Hangyu Fan , Yong Chen , Xianbo Hou , Tao Liu","doi":"10.1016/j.tws.2025.113035","DOIUrl":"10.1016/j.tws.2025.113035","url":null,"abstract":"<div><div>Truncated conical shells have numerous applications in aerospace and other engineering fields. However, they have been studied far less extensively than cylindrical shells, and even scarcer research has been done on truncated conical shells made of continuous fiber-reinforced composites. This paper presents a novel fabrication method using unidirectional fiber prepregs to produce conical shell specimens with varying ply angles and stagger angles. Quasi-static compression tests were conducted to obtain fundamental metrics such as load-displacement curves and specific energy absorption. More importantly, a finite element simulation approach, named Partition Approximation Method, was developed. Comparisons with common modeling methods demonstrated that the Partition Approximation Method more effectively predicts the compression response and damage modes. The results indicate that composite conical shell structures exhibit high energy absorption characteristics and relatively smooth stress plateaus due to their progressive failure mechanisms. Designs with stagger angles of 12° and 24° were found to significantly enhance the specimens' compression stability and specific energy absorption performance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113035"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143323000","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}

引用次数: 0

Ballistic performance of the UHMWPE fiber-reinforced composite helmet: Experiments and numerical simulations

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-31 DOI: 10.1016/j.tws.2025.113037

Qiran Sun , Jun Lin , Yanzhe Gai , Yongqiang Li

{"title":"Ballistic performance of the UHMWPE fiber-reinforced composite helmet: Experiments and numerical simulations","authors":"Qiran Sun , Jun Lin , Yanzhe Gai , Yongqiang Li","doi":"10.1016/j.tws.2025.113037","DOIUrl":"10.1016/j.tws.2025.113037","url":null,"abstract":"<div><div>The composite helmet has proven effective in protecting soldiers against high-speed projectile penetration. However, blunt head injuries caused by significant back face deformation (BFD) after ballistic impacts remain a critical issue. The current study evaluated the ballistic performance of an ultra-high-molecular-weight polyethylene (UHMWPE) helmet through ballistic testing and finite element simulation. The 6 mm thick UHMWPE helmet was impacted by a 7.62 × 25 mm full metal jacket (FMJ) bullet at three locations: frontal, lateral, and crown. To capture precise deformation data, simultaneous BFDs were measured using Digital Image Correlation (DIC) technology. Corresponding finite element model was subsequently developed and validated. Both experimental and simulation results indicated that the UHMWPE helmet experienced localized damage with a plastic hinge and notable delamination during impact. Furthermore, a comparative analysis of BFD across different impact locations revealed that the frontal impact presented the highest risk of head injury, followed by the crown and lateral impacts. The study also explored the effect of helmet thickness on ballistic performance, finding that increasing thickness enhanced the helmet's ability to mitigate BFD with a nonlinear weakened trend. The study provides valuable insights into the protective capabilities of UHMWPE helmets and a helpful suggestion for evaluating hybrid composite helmets in future investigations.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113037"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378871","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}

引用次数: 0

A compact vibration isolator based on a structural-functional integrated lattice

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-30 DOI: 10.1016/j.tws.2025.113001

Meng Jia, Ning Dai, Tingwei Wang, Chengqi Zuo

{"title":"A compact vibration isolator based on a structural-functional integrated lattice","authors":"Meng Jia, Ning Dai, Tingwei Wang, Chengqi Zuo","doi":"10.1016/j.tws.2025.113001","DOIUrl":"10.1016/j.tws.2025.113001","url":null,"abstract":"<div><div>In the aerospace field, vibrations pose significant challenges to the operational accuracy and safety of onboard equipment. In this paper, a compact vibration isolator based on a structural-functional integrated lattice is proposed. A parametric model for the isolator is developed to tune the first-order natural frequency of the vibration system. Firstly, an optimization objective of maximizing compliance (minimizing stiffness) is introduced based on the linear system’s response characteristics. Zigzag structures are designed using topology optimization, and a calculation method for the structural stiffness is proposed to reduce iteration cycles. Secondly, half of the body-centered cubic (H-BCC) lattice is employed to reduce the mass and stiffness of the zigzag structures. The stiffness of the H-BCC isolator is equivalently calculated, and the calculation method is validated through quasi-static experiments. Thirdly, a piecewise linear model is developed to analyze the stiffness nonlinearity caused by structural densification. The stability and bifurcation of the harmonic response are studied using the Floquet multipliers and the system response is calculated numerically. The nonlinear system’s superharmonic resonance is manifested through the short-time Fourier transform. Finally, vibration experiments are conducted to evaluate the performance. The harmonic response demonstrates that the designed isolator effectively tunes the system’s natural frequency, thereby broadening the vibration attenuation bandwidth. The response discontinuity caused by stiffness nonlinearity is validated through both calculations and experiments. Under random vibration excitation, the proposed isolator exhibits a vibration isolation efficiency exceeding 90%, confirming the effectiveness under both linear and nonlinear conditions.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113001"},"PeriodicalIF":5.7,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182435","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}

引用次数: 0

Experimental study on the mechanical and thermal properties of PEEK, CF/PEEK, and GF/PEEK thin-walled cylinders under static compressive tests

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-30 DOI: 10.1016/j.tws.2025.113032

Shuyan Nie , Kunyong Guo , Yuanhao Tian , Liming Chen , Zhaoxin Yun , Xin Pan , Weiguo Li , Jie Wang , Xianbo Hou , Shaowei Zhu , Tao Liu , Zhenhua Song

{"title":"Experimental study on the mechanical and thermal properties of PEEK, CF/PEEK, and GF/PEEK thin-walled cylinders under static compressive tests","authors":"Shuyan Nie , Kunyong Guo , Yuanhao Tian , Liming Chen , Zhaoxin Yun , Xin Pan , Weiguo Li , Jie Wang , Xianbo Hou , Shaowei Zhu , Tao Liu , Zhenhua Song","doi":"10.1016/j.tws.2025.113032","DOIUrl":"10.1016/j.tws.2025.113032","url":null,"abstract":"<div><div>Polyether ether ketone (PEEK) and its fiber reinforced composite thin-walled tube structures (TWCs) are widely used in engineering, but their mechanical properties under thermal conditions are rarely reported. In this paper, the static compressive mechanical properties of PEEK-TWCS, short glass fiber reinforced PEEK TWCS (GF/PEEK-TWCS) and short carbon fiber reinforced PEEK TWCS (CF/PEEK-TWCS) at 20 ℃ and 170 ℃ were investigated experimentally. The outcomes underscore that the compressive strength, specific energy absorption and stiffness of the cylinders are significant sensitive to temperature, with PEEK-TWCS demonstrating the highest sensitivity, exhibiting a reduction of over 75 % at 170 °C. Comparatively, the reinforcing effects of carbon fibers and glass fibers are markedly pronounced at 170 °C, substantially ameliorating the mechanical performance of the cylindrical structures. Utilizing a 3D-Digital Image Correlation (DIC) optical strain measurement system, an inhomogeneous strain distribution in the elastic phase was observed for all materials, with increasing compression, a buckling half-wave formed, leading to localized buckling. According to the micro-nano electron computed tomography scanner (Nano-CT), the plasticity of GF/PEEK-TWCS is better than that of CF/PEEK-TWCS and PEEK-TWCS at 20 °C. In addition, microscopic fracture surface analysis revealed that the ductile matrix behavior in CF/PEEK, juxtaposed with brittle fiber fracture, indicative of interface damage and fiber pull-out. In contrast, PEEK displayed brittle fracture characteristics. This research provides support for the temperature-dependent mechanical behavior of PEEK-based composites, offering a foundation for the development of advanced materials for high-temperature applications.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113032"},"PeriodicalIF":5.7,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182040","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}

引用次数: 0

Nonlinear static and dynamic responses of edge-cracked FG-GPLRC dielectric beams with internal pores 带有内孔的边缘开裂 FG-GPLRC 介电梁的非线性静态和动态响应

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-28 DOI: 10.1016/j.tws.2025.113016

Zhi Ni, Shaoyu Zhao, Jie Yang

{"title":"Nonlinear static and dynamic responses of edge-cracked FG-GPLRC dielectric beams with internal pores","authors":"Zhi Ni, Shaoyu Zhao, Jie Yang","doi":"10.1016/j.tws.2025.113016","DOIUrl":"10.1016/j.tws.2025.113016","url":null,"abstract":"<div><div>The dielectric properties of functionally graded (FG) graphene platelets (GPLs) reinforced composite (FG-GPLRC) beams enable tunable mechanical responses under external electric fields and hence offer an effective way for enhanced control of structural performance. This paper investigates nonlinear static and dynamic responses of FG-GPLRC dielectric beams with internal pores and an open edge crack. A two-step hybrid mechanical model is developed to determine the material properties of the multiphase composites. The governing equations, incorporating damping and dielectric properties, are derived within the framework of Timoshenko beam theory and the nonlinear von Kármán strain-displacement relationship. The stress intensity factor (SIF) at the crack tip of the cracked FG-GPLRC beam is obtained via finite element method (FEM). Differential quadrature (DQ) and incremental harmonic balance (IHB) methods combined with the arc-length algorithm methods are utilized to solve the nonlinear system. After the present analysis has been verified, a comprehensive parametric study is conducted to examine the effects of internal pore attributes, crack location and depth, damping, GPL properties and the applied electric field on the nonlinear bending, free and forced vibrations of the cracked FG-GPLRC beam. The study indicates that the internal pore attributes and crack location and depth have a significant impact on the nonlinear frequency, dimensionless amplitude, and peak amplitude excitation frequency of the cracked FG-GPLRC beam under an applied voltage.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113016"},"PeriodicalIF":5.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182042","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}

引用次数: 0

Compressive behavior of a novel cold-formed steel built-up box section: Tests, modelling and design

IF 5.7 1区工程技术

Thin-Walled Structures Pub Date : 2025-01-28 DOI: 10.1016/j.tws.2025.113024

Wei Wang , Krishanu Roy , Hooman Rezaeian , Kang Huang , Shubham Tiwari , James B.P. Lim

{"title":"Compressive behavior of a novel cold-formed steel built-up box section: Tests, modelling and design","authors":"Wei Wang , Krishanu Roy , Hooman Rezaeian , Kang Huang , Shubham Tiwari , James B.P. Lim","doi":"10.1016/j.tws.2025.113024","DOIUrl":"10.1016/j.tws.2025.113024","url":null,"abstract":"<div><div>This paper investigates a novel built-up box section constructed from single cold-formed steel (CFS) C- and U-sections, which are connected using self-drilling screws along their extended flanges. Both experimental and numerical analyses were conducted to study the buckling behavior and ultimate strength of these pin-ended, axially loaded CFS built-up box section columns. The study focuses on key parameters such as thicknesses (0.95 mm and 1.15 mm), screw spacing (300 mm and 600 mm), and slenderness ratios (42, 72, 102, 132). A total of 48 specimens were tested under axial compression, exhibiting significant local-distortional and local-flexural interactive buckling modes. Finite element models were developed using ABAQUS software and validated based on the experimental results. The numerical simulations were used to assess the effects of screw spacing and thickness on the ultimate strength of the built-up box columns. The ultimate strengths obtained from both the experiments and the finite element analysis were then compared to the predictions made using the Effective Width Method (EWM) and the Direct Strength Method (DSM), as outlined in AISI S100 (2016) and AS/NZS 4600 (2018). The comparison shows that DSM overestimated the axial capacity of these novel built-up box section columns by an average of 15 %, while EWM was overly conservative, with mean experimental-to-design strength ratios exceeding 2.5.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"210 ","pages":"Article 113024"},"PeriodicalIF":5.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182429","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}

引用次数: 0