Structures最新文献_第6页

Seismic performance of coupled precast concrete wall panels connected by novel vertical bolted joints 通过新型垂直螺栓连接件连接的耦合预制混凝土墙板的抗震性能

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107654

{"title":"Seismic performance of coupled precast concrete wall panels connected by novel vertical bolted joints","authors":"","doi":"10.1016/j.istruc.2024.107654","DOIUrl":"10.1016/j.istruc.2024.107654","url":null,"abstract":"<div><div>This paper proposed the coupled precast concrete wall panels connected by novel vertical bolted joint that were suitable for low- and mid-rise buildings. Three vertical bolted joint specimens were tested under shear cyclic loading to investigate the influence of different types of steel plates on the failure modes and mechanical performance of the joint specimens. Based on the experimental results, two steel plates with the highest bearing capacity and the best ductility were selected. According to the above two selected steel plates, four coupled wall panels were designed and tested under quasi-static cyclic loading to study the seismic performance. The finite element model of a coupled wall panel connected by novel vertical bolted joints was established by using OpenSees, and the simulation results showed good agreement with the experimental results. Then, a parametric study was conducted based on the finite element model to investigate the influence of the coupling ratio on the seismic performance of the coupled wall panels. Finally, an analytical study for calculating the initial stiffness of the coupled wall panels was conducted, and the calculation results agreed well with the experimental results.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexural behavior of steel/GFRP reinforced concrete beams having layered sections integrated with normal and rubberized concrete 钢/玻璃纤维增强混凝土梁的挠曲行为，其分层截面与普通混凝土和橡胶混凝土融为一体

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107633

{"title":"Flexural behavior of steel/GFRP reinforced concrete beams having layered sections integrated with normal and rubberized concrete","authors":"","doi":"10.1016/j.istruc.2024.107633","DOIUrl":"10.1016/j.istruc.2024.107633","url":null,"abstract":"<div><div>Rubberized concrete (RuC) is one of the possible sustainable solutions to the problem of quickly disposing of old tires. This study introduced a new coating material (metakaolin, MK) for crumb rubber (CR) at a controlled temperature to avoid decreasing the RuC mechanical properties. Additionally, to prevent the possible reduction in the RuC strength on the RC beam behavior, the functionally graded material (FGM) approach was applied (layered beam section with RuC at 67 % of the beam section and normal concrete (NC) at the top one). The influence of RC beams on the tensile reinforcement (glass fiber-reinforced polymer (GFRP) instead of steel) was also examined. The experimental investigation comprised several concrete combinations: conventional concrete and RuC integrated uncoated and MK-coated CR replacing sand with percentages (0 %, 5 %, 15 %, and 25 %). The mechanical characteristics of concrete mixtures under compression and splitting tension tests were examined. Moreover, fourteen RC beams were experimentally loaded in flexural to investigate the impact of proposed parameters on the beam response. Following that, Finite Element (FE) modeling was carried out to examine the influence of the additional parameters on the RC beams' performance. The results demonstrate a notable improvement in the compressive strength of concrete by 17.4 % and a 25.4 % rise in split tensile strength due to the use of MK-coated CR compared to the uncoated CR. The impact of MK-created CR was more prominent in increasing the GFRP RC beam loads than the steel RC ones. In addition, using the FGM approach could eliminate the CR effect and exhibit nearly the same NC beam load.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementation of multi-walled carbon nanotube incorporated GFRP as an alternative for CFRP in strengthening of concrete cylinders 在混凝土圆柱体加固中使用多壁碳纳米管 GFRP 替代 CFRP

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107606

{"title":"Implementation of multi-walled carbon nanotube incorporated GFRP as an alternative for CFRP in strengthening of concrete cylinders","authors":"","doi":"10.1016/j.istruc.2024.107606","DOIUrl":"10.1016/j.istruc.2024.107606","url":null,"abstract":"<div><div>Carbon fibre is the most widely utilized fibre for strengthening and retrofitting applications in the construction sector. The high cost of carbon fibre necessitates the identification of an alternative system for the retrofitting and repairing of concrete structures. In the current study, the characteristics of Glass Fibre Reinforced Polymer (GFRP), Carbon Fibre Reinforced Polymer (CFRP), and Multi-Walled Carbon Nanotube (MWCNT) incorporated GRFP are assessed with epoxy as a matrix for concrete cylinder confinement. The evaluation of one and two-layer CFRP confinement on concrete cylinders is carried out and outcomes are compared with the three-layer MWCNT incorporated GFRP confinement. A significant increase was observed in the axial compressive load-bearing capability of specimens with 1 wt percentage (wt%) MWCNT incorporated GFRP confined concrete cylinders. The axial load-carrying capability of concrete specimens with one layer of CFRP confinement was equivalent to that of specimens with 1 wt% MWCNT incorporated three-layer GFRP confinement. The axial strain of MWCNT incorporated three-layer GFRP confined specimens was 75 % more than one-layer and 12 % higher than two-layer CFRP confined specimens. According to observations, MWCNT-incorporated FRP confinement improves the energy absorption and ductility index. Ultrasonic pulse velocity test results confirmed the potency of three-layer GFRP confinement as a replacement for one and two layers of CFRP. A cost analysis is also carried out to validate the economic viability of the MWCNT-based GFRP compared to CFRP confinement.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tensile properties and load distribution of multi-bolted pultruded basalt FRP joints with multi-directional fiber lay-ups 多方向纤维铺设的多螺栓拉挤玄武岩玻璃钢接头的拉伸性能和载荷分布

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107637

{"title":"Tensile properties and load distribution of multi-bolted pultruded basalt FRP joints with multi-directional fiber lay-ups","authors":"","doi":"10.1016/j.istruc.2024.107637","DOIUrl":"10.1016/j.istruc.2024.107637","url":null,"abstract":"<div><div>Pultruded fiber-reinforced polymer (FRP) composites have gained significant popularity in truss structures in recent decades. However, the inherent brittle feature of pultruded FRP plates results in uneven load distribution among bolts, weakening the composite material's strength advantage. This study focuses on experimental investigations of single-column, multi-row bolted joints in pultruded fiber-reinforced composites. The aim is to assess the tensile properties of these joints and analyze their load distribution and failure characteristics. Studied parameters include hole location, row counts, bolt pre-tightening forces, plate thicknesses, and bolt sizes. To evaluate the uneven load distribution between bolts in multi-bolted composite joints, the concept of the bolt row load distribution factor (<span><math><msub><mrow><mi>U</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span>) is introduced. The research findings highlight the transition in failure modes from brittle shear-out failure to ductile pin-bearing failure when the end-to-diameter ratio was more than 3.5 and pitch-to-diameter ratio was over four. The bolts in the first row experienced the earliest failure due to their higher load share. However, increasing the pre-tightening force or diameter of bolts in the middle row effectively mitigated load distribution unevenness. Moreover, a calculation method for determining the joint strength of multi-bolt composite joints is presented.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on bolted flanged splice connections for square CFST column 方形 CFST 柱螺栓法兰拼接连接试验研究

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107644

引用次数: 0

Machine learning-based probabilistic predictions for Concrete Filled Steel Tube (CFST) column axial capacity 基于机器学习的混凝土填充钢管 (CFST) 柱轴向承载力概率预测

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107543

{"title":"Machine learning-based probabilistic predictions for Concrete Filled Steel Tube (CFST) column axial capacity","authors":"","doi":"10.1016/j.istruc.2024.107543","DOIUrl":"10.1016/j.istruc.2024.107543","url":null,"abstract":"<div><div>This study presents a novel probabilistic machine learning (ML) approach using Natural Gradient Boosting (NGBoost) to predict the axial compressive capacity of Concrete Filled Steel Tube (CFST) columns. Leveraging a comprehensive dataset of 1,127 experimentally tested CFST specimens under axial compressive loads, we compare the performance of various ML algorithms. These include deterministic models like eXtreme Gradient Boosting (XGBoost) and Artificial Neural Networks (ANN), and probabilistic models such as XGBoost-Distribution (XGBD) and NGBoost. The NGBoost model, which employs Normal and LogNormal distributions to account for uncertainties in input data, demonstrates superior predictive accuracy and robustness. SHapley Additive exPlanations (SHAP) are utilized to interpret the influence of input features, providing insights into the relative importance of different structural parameters. The predictive performance of the NGBoost model with LogNormal distribution is benchmarked against existing design codes, including Eurocode 4, ANSI/AISC 360-22 AS/NZS 2327, and Chinese Standard (GB50936-2014), showcasing its enhanced accuracy and reliability. This approach not only improves predictive performances but also integrates uncertainty quantification, making it highly suitable for design applications in Civil Engineering where understanding the variability in the structural behavior is crucial.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

In-situ load testing of an ancient masonry structure using fibre optics 利用光纤对古代砖石结构进行原位荷载测试

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107567

引用次数: 0

Failure mechanism and deformation limit of square tubular T-joints under impact loading 冲击荷载下方形管 T 型接头的失效机理和变形极限

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-28 DOI: 10.1016/j.istruc.2024.107529

{"title":"Failure mechanism and deformation limit of square tubular T-joints under impact loading","authors":"","doi":"10.1016/j.istruc.2024.107529","DOIUrl":"10.1016/j.istruc.2024.107529","url":null,"abstract":"<div><div>Previous research has indicated that the width ratio of the brace to the chord (<em>β</em>) of square tubular T-joints governs their failure modes and ultimate strength under static loads. In this study, a series of impact tests on square tubular T-joints with different <em>β</em> are conducted to investigate the failure mechanism and determine the deformation limit of T-joints under impact loading. Although the T-joints under an impact load fail in a failure mode similar to that under static loading, the impact responses are significantly influenced by the inertial effect, which leads to dynamic buckling of the chord flange and web, as well as a complicated deformation pattern between the overall chord bending and local indentation. The impact deformation limit and ultimate strength of T-joints are proposed based on the test results. Furthermore, the impact failure and dynamic force transfer mechanisms are clarified in detail based on the strain development with the numerical simulations. Finally, the ultimate strength at the proposed deformation limit is compared with the typical existing design formulae. The effect of <em>β</em> on the dynamic ultimate strength of T-joints is discussed.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A conceptual design and structural analysis of thick panel kirigami for deployable volumetric modular structure 用于可部署体积模块化结构的厚板叽里格米的概念设计和结构分析

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-26 DOI: 10.1016/j.istruc.2024.107625

{"title":"A conceptual design and structural analysis of thick panel kirigami for deployable volumetric modular structure","authors":"","doi":"10.1016/j.istruc.2024.107625","DOIUrl":"10.1016/j.istruc.2024.107625","url":null,"abstract":"<div><div>This study addresses key challenges in modular construction, such as transportation and lifting limitations, by introducing a kirigami-inspired modular structure that folds into a compact flat-pack and deploys into a volumetric form. The research explores two pop-up kirigami kinematic (i.e.V-fold and sliding) mechanisms utilising thick panel material for modular structural elements. The study develops spatial linkage with degree-four vertices by implementing a thick panel axis-shift method, enabling transformation into volumetric forms through a single-degree-of-freedom actuation. The structural performance of the kirigami deployment pattern under service loads was evaluated using finite element modelling. Fibre-reinforced polymer was selected as the primary material due to its low self-weight and adequate structural properties, making it a viable alternative to conventional steel for deployable structures. Results demonstrated compliance with design standards for displacements, stresses, and global drift. Additionally, the inclusion of a locking mechanism significantly enhances the structural stability of the module by restraining any potential movement in its fully deployed state.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Axial compressive behaviour and design of concrete-filled wire arc additively manufactured steel tubes 混凝土填充钢丝电弧快速成型钢管的轴向抗压性能与设计

IF 3.9 2区工程技术

Structures Pub Date : 2024-10-26 DOI: 10.1016/j.istruc.2024.107495

{"title":"Axial compressive behaviour and design of concrete-filled wire arc additively manufactured steel tubes","authors":"","doi":"10.1016/j.istruc.2024.107495","DOIUrl":"10.1016/j.istruc.2024.107495","url":null,"abstract":"<div><div>The axial compressive behaviour of concrete-filled wire arc additively manufactured (WAAM) steel tubular columns is investigated experimentally in this paper. Firstly, the manufacture of a series of WAAM steel plates and tubes is described. The results of tensile testing performed on coupons cut from the WAAM plates, to obtain the mechanical properties of the printed material, are summarised. 3D laser scanning was employed to generate digital models and to capture the geometric features of the WAAM steel test specimens. Concrete was then cast into the WAAM steel tubes, creating a total of nine concrete-filled steel tubular (CFST) specimens of different diameters, thicknesses and lengths that were subjected to compressive loading. The axial compressive load-deformation responses and ultimate loads of the specimens were obtained and the influence of the as-built surface undulations of the WAAM sections was assessed. Comparisons of the test results against existing structural design provisions highlight the need to consider the influence of the weakening effect of the geometric undulations that are inherent to the WAAM process on the structural response of CFST sections, in order to achieve safe-sided strength predictions.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0