Journal of Constructional Steel Research最新文献_第8页

Experimental and numerical study of CFST with internal defects under eccentric compression 偏心受压下含内缺陷钢管混凝土的试验与数值研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-12-02 DOI: 10.1016/j.jcsr.2025.110157

Jiahang Xu , Ting Zhou , Zhihua Chen , Yutong Zhang , Ou Zhao

Internal defects and voids within concrete cores are inevitably generated during the construction of concrete-filled steel tube structures, which weaken the bond at the steel-concrete interface and impair the overall composite action of the member. This paper investigates the structural behavior of square concrete-filled steel tube (SCFST) columns with internal concrete defects subjected to combined compression and bending. The eccentric compression testing was conducted on a total of 16 specimens designed with five different types of internal concrete defects. The failure modes, initial stiffnesses, loading-bearing capacities and strain developments of specimens were presented in detail and discussed. The structural responses of specimens with the same defect ratios but different defect distributions were analyzed. Edge defects combined with eccentricities were found to be most detrimental. Finite element analysis (FEA) models were then developed and validated against the test structural responses. Parametric studies were conducted based on the validated FEA models. Finally, a calculation method for the eccentric bearing capacity of SCFST columns with internal concrete defects was proposed based on the sectional plasticity theory and verified through comparisons with both experimental and FEA results. The proposed approach is shown to be applicable, accurate and effective, providing useful guidelines for the design and assessment of eccentrically loaded SCFST columns with internal concrete defects.

在钢管混凝土结构施工过程中，不可避免地会产生混凝土核心内部的缺陷和空洞，这些缺陷和空洞会削弱钢-混凝土界面的粘结，影响构件的整体组合作用。本文研究了含有混凝土内部缺陷的方钢管混凝土柱在压缩和弯曲联合作用下的结构性能。采用5种不同类型混凝土内部缺陷设计了16个试件，进行了偏心压缩试验。详细介绍了试件的破坏模式、初始刚度、承载能力和应变发展情况。分析了缺陷率相同但缺陷分布不同的试件的结构响应。边缘缺陷结合偏心是最有害的。然后建立了有限元分析（FEA）模型，并根据测试结构的响应进行了验证。基于验证的有限元模型进行了参数化研究。最后，基于截面塑性理论，提出了含混凝土内部缺陷SCFST柱偏心承载力的计算方法，并与试验和有限元结果进行了对比验证。结果表明，本文提出的方法是适用的、准确的和有效的，为混凝土内部缺陷偏心加载SCFST柱的设计和评估提供了有益的指导。

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引用次数: 0

Shaking table tests and numerical studies of a high-rise TFPB-isolated steel frame 高层tffb隔震钢框架振动台试验与数值研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-12-01 DOI: 10.1016/j.jcsr.2025.110147

Yanqing Xu , Tong Guo , Ruizhao Zhu , Zhongxiang Liu , Jun Yang , Hongbo Jiang

To evaluate the effectiveness of the triple friction pendulum bearing (TFPB) in high-rise buildings, a 1/15-scaled, three-by-three, 12-story steel frame structure with TFPBs was designed and tested on a shaking table under earthquakes of varying intensities. It was found that the TFPBs performed well in the tests, keeping the isolated high-rise structure elastic under the maximum considered earthquakes (MCEs), while some damage occurred in the base-fixed structure. The reduction in peak roof absolute acceleration generally improved with the increase in earthquake levels, reaching up to 82.4 % in these tests. As the earthquake intensities increased, the peak story drift profiles of the isolated structure became significantly different from those of the base-fixed structure, which exhibited maximum drifts in the third and fourth stories. An analytical model of the isolated structure was developed using the open system for earthquake engineering simulation (OpenSees) to replicate the test results. It was found that the numerical results matched well with the test results, and the failure of the isolated system was further predicted using the numerical model. According to the incremental dynamic analysis, no bearing uplift occurred before the inter-story drift reached its threshold value, demonstrating the rationality of the bearing design. Based on the numerical results, it can also be concluded that the superposition of high-order vibration modes can effectively reduce the seismic responses of high-rise isolated buildings

为评价三摩擦摆支座（TFPB）在高层建筑中的有效性，设计了1/15比例、3 × 3、12层的三摩擦摆钢架结构，并在不同烈度地震下进行了振动台试验。试验结果表明，TFPBs在最大考虑地震作用下仍能保持隔震高层结构的弹性，而基础固定结构存在一定的损伤。随着震级的增加，顶棚绝对加速度的减小幅度总体上有所提高，在这些试验中达到82.4%。随着地震烈度的增加，隔震结构的峰值层位移曲线与基础固定结构的峰值层位移曲线有显著差异，隔震结构的峰值层位移曲线在第3层和第4层最大。利用地震工程模拟开放系统（OpenSees）建立了隔震结构的分析模型，以复制试验结果。数值计算结果与试验结果吻合较好，并利用数值模型对隔离系统的失效进行了预测。根据增量动力分析，在层间位移达到阈值之前，支座未发生抬升，说明支座设计的合理性。数值结果表明，高阶振型叠加可以有效降低高层隔震建筑的地震响应

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引用次数: 0

Fire resilience of stiffened concrete-filled double-skin-steel tubular columns: Experimental and nonlinear finite-element analysis 加筋钢管混凝土柱的耐火性能：试验与非线性有限元分析

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-29 DOI: 10.1016/j.jcsr.2025.110151

Mohammad Zakir , Dipti Ranjan Sahoo , Souvik Saha

Concrete-filled double-skin steel tubular (CFDST) columns are an emerging composite structural member known for their high load-carrying capacity and ductility. Despite their promising structural performance, limited studies have addressed their behavior under fire exposure, even though fire poses a major threat to building safety and critical infrastructure. In fire scenarios, CFDST columns are particularly vulnerable to inadequate bonding at the steel-concrete interface and premature local buckling. To enhance steel-concrete composite interaction and delay local buckling under such conditions, this study investigates the role of longitudinal steel stiffeners in improving the fire resistance of circular CFDST columns. An experimental program comprising ten axial compression tests was performed on fire-exposed circular CFDST specimens, varying stiffener characteristics such as number, configuration (with constant total stiffener area), and cross-sectional geometry. The results showed that stiffened specimens exhibited significantly improved fire endurance compared to unstiffened columns, with residual load capacities reaching up to about 43 %. Based on the test observations, a confined concrete stress-strain model was proposed and validated through detailed nonlinear finite element (FE) analyses, showing close correlation with experimental data. The validated FE model was further employed for a parametric study on 50 additional specimens to determine the optimal stiffener parameters influencing fire resistance and post-fire strength. Finally, a predictive design model for the fire resistance of stiffened circular CFDST columns is proposed, achieving an average error of approximately 3 % and a maximum deviation below 9 %, confirming its suitability for engineering practice.

双皮钢管混凝土柱是一种新兴的复合结构构件，具有较高的承载能力和延性。尽管它们的结构性能很好，但有限的研究已经解决了它们在火灾下的行为，尽管火灾对建筑安全和关键基础设施构成了重大威胁。在火灾情况下，CFDST柱特别容易受到钢-混凝土界面粘结不足和过早局部屈曲的影响。为了增强钢-混凝土组合相互作用，延缓这种条件下的局部屈曲，本研究研究了纵向钢筋加强筋在提高CFDST圆形柱耐火性能中的作用。在火灾暴露的圆形CFDST试样上进行了10次轴压试验，改变了加强筋特性，如数量、结构（总加强筋面积恒定）和横截面几何形状。结果表明，与未加筋柱相比，加筋柱的耐火性能显著提高，剩余荷载能力达到43%左右。在试验观察的基础上，提出了约束混凝土应力-应变模型，并通过详细的非线性有限元分析进行了验证，该模型与试验数据具有较强的相关性。进一步利用验证的有限元模型对50个试件进行参数化研究，以确定影响耐火性能和火灾后强度的最优加劲参数。最后，建立了圆形CFDST加筋柱耐火性能预测设计模型，平均误差约为3%，最大偏差小于9%，验证了该模型的适用性。

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引用次数: 0

Corrosion behaviour of stainless-clad bimetallic steel plate fabricated by cold spray additive manufacturing 冷喷涂增材制造不锈钢复合双金属钢板的腐蚀行为

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-26 DOI: 10.1016/j.jcsr.2025.110148

Yixun Wang , Cheng Zhang , Bo Ching Wong , Robert Voyle , Tak-Ming Chan

This study aims to investigate the corrosion behaviour of stainless-clad bimetallic steel plate in simulated marine environments. The bimetallic steel plate, made of structural steel S355J0 and stainless steel SS304L, was fabricated by cold spray additive manufacturing (CSAM). The electrochemical corrosion performance was investigated by polarisation tests and electrochemical impedance spectroscopy tests. The galvanic corrosion behaviour at the bimetallic interface was studied by analysing the formation of corrosion products during the neutral salt spray test. The results show that the porosity of cold sprayed SS304L decreases from 6.26 % to 0.19 % after annealing at 1100 °C, resulting in a 74 % reduction in corrosion current density and improved passivation performance. The galvanic coupling increases the corrosion current of stainless-clad bimetallic steel plate by 1.4 times and results in the deep corrosion valley at the bimetallic interface. The α/γ value of corrosion products on the surface of structural steel S355J0 decreases by 75 % with increase of exposure time from 24 h to 1008 h, indicating the loosening of corrosion products and decline of the protective performance. The additional Zn coating isolates the bimetallic interface from corrosion media and yields a rust layer thickness comparable to that of stainless steel SS304L.

本研究旨在探讨不锈钢包层双金属钢板在模拟海洋环境中的腐蚀行为。采用冷喷涂增材制造技术（CSAM）制备了以S355J0结构钢和SS304L不锈钢为材料的双金属钢板。通过极化试验和电化学阻抗谱试验研究了其电化学腐蚀性能。通过分析中性盐雾试验中腐蚀产物的形成，研究了双金属界面的电偶腐蚀行为。结果表明：冷喷涂SS304L合金经1100℃退火后，气孔率由6.26%降低到0.19%，腐蚀电流密度降低74%，钝化性能得到改善；电偶耦合使不锈钢复合双金属钢板的腐蚀电流增加了1.4倍，并在双金属界面处形成了深腐蚀谷。从24 h到1008 h，随着暴露时间的增加，S355J0结构钢表面腐蚀产物的α/γ值下降了75%，表明腐蚀产物松动，防护性能下降。额外的锌涂层将双金属界面与腐蚀介质隔离开来，并产生与不锈钢SS304L相当的防锈层厚度。

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引用次数: 0

Flexural performance of steel-perimeter variable-order laminated slab composite beams: An integrated study 钢-周变阶叠合板组合梁抗弯性能的综合研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-26 DOI: 10.1016/j.jcsr.2025.110152

Lin Yang , Ying-Jie Shan , Jin-Hua Kuang , Chong-Shao Zhao , Yong-Zhi Gong

This study develops an innovative steel-perimeter variable-order laminated slab composite beam, characterized by a composition of peripheral variable-order laminated slab and H-shaped steel beam, and systematically investigates its flexural performance through an integrated experimental loading, numerical simulation, and theoretical analysis. A four-point bending experimental program comprising eight composite beam specimens was conducted to characterize the flexural performance and validate the numerical models. The experimental results revealed four successive failure modes: transversal concrete cracking, steel beam flange yielding, concrete partial crushing and interfacial debonding. The integrity and flexural loads exhibited positive correlations with the laminated width, shear connection degree, and concrete slab thickness. In particular, the post-cast ultra-high performance concrete (UHPC) strips significantly enhanced the flexural performance. Additionally, all test beams demonstrated favorable strength development, ductility, and anti-slip performance. The established Abaqus models could effectively simulated both the bending behavior and damage development of the test beams. The parametric analysis involving twenty numerical models further identified that the ultimate flexural capacity was primarily governed by the steel beam strength, while the reinforcement ratio, precast concrete slab shelving width and post-cast normal concrete grade showed marginal effects. Furthermore, the new simplified plasticity theory-based equations were developed to design the ultimate flexural capacity of the steel-perimeter variable-order laminated slab composite beams, delivering excellent accuracy. These findings provided a valuable reference for the bending design and analysis of the novel composite beam, supporting its practical engineering application.

本研究开发了一种新型的钢-周缘变阶叠合板组合梁，其特点是由周边变阶叠合板和h型钢梁组成，并通过实验加载、数值模拟和理论分析相结合的方法系统地研究了其抗弯性能。采用由8个试件组成的四点弯曲试验程序，对组合梁的抗弯性能进行了表征，并对数值模型进行了验证。试验结果表明：混凝土横向开裂、钢梁翼缘屈服、混凝土局部破碎和界面脱落为4种连续破坏模式。完整性和受弯荷载与层合宽度、剪切连接度和混凝土板厚度呈正相关。特别是后浇筑的超高性能混凝土（UHPC）条显著提高了抗弯性能。此外，所有试验梁均表现出良好的强度发展、延性和抗滑性能。所建立的Abaqus模型能够有效地模拟试验梁的弯曲行为和损伤发展。20个数值模型的参数化分析进一步确定了极限抗弯承载力主要受钢梁强度的影响，配筋率、预制混凝土板架宽度和浇筑后普通混凝土等级对极限抗弯承载力的影响较小。在此基础上，建立了钢-周变阶叠合板组合梁极限抗弯承载力简化方程，计算精度较高。这些研究结果为新型组合梁的弯曲设计和分析提供了有价值的参考，为其实际工程应用提供了依据。

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引用次数: 0

Research on fatigue performance and life prediction of high strength steel in corrosive environment: A review 腐蚀环境中高强度钢疲劳性能及寿命预测研究综述

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-25 DOI: 10.1016/j.jcsr.2025.110139

Huanhuan Wei , Yiqun Tang , Yao-Peng Liu , Siu-Lai Chan

High strength steel components operating in complex environments, such as those exposed to ocean conditions or acid rain, are particularly susceptible to the combined effects of corrosive media and cyclic loads. Corrosion fatigue constitutes a significant threat to the long-term durability and structural integrity of engineering systems. To address these challenges, this article analyzes the characteristics and failure mechanisms related to corrosion fatigue, summarizes key influencing factors, elaborates on existing prediction methods, and proposes practical strategies for mitigating corrosion fatigue. The results of relevant studies indicate that corrosion significantly accelerates the initiation and propagation of cracks, leading to a significant reduction in fatigue life. The chemical composition of corrosive media, environmental temperature and humidity, and applied stress levels have been shown to have a significant impact on fatigue performance. Then, the commonly used experimental and analytical methods for studying the corrosion fatigue behavior of high-strength steel were reviewed, and their advantages and disadvantages were compared and discussed. In order to improve the corrosion fatigue resistance of high-strength steel, measures such as surface treatment technology and material optimization have been proposed. Building on a comprehensive literature review and the authors’ previous research, this paper evaluates the fatigue performance of high strength steel in corrosive environments. Furthermore, it presents a forward-looking perspective on future research directions, including the integration of artificial intelligence and big data for corrosion fatigue life prediction, multi-scale assessments, and in-depth investigation into failure mechanisms. This work aims to support the development of more reliable design methodologies and promote broader application of high strength steel in corrosive environments.

在复杂环境中工作的高强度钢部件，例如暴露在海洋条件或酸雨中的部件，特别容易受到腐蚀性介质和循环载荷的综合影响。腐蚀疲劳对工程系统的长期耐久性和结构完整性构成重大威胁。针对这些挑战，本文分析了腐蚀疲劳的特征和失效机制，总结了腐蚀疲劳的关键影响因素，阐述了现有的预测方法，并提出了缓解腐蚀疲劳的实用策略。相关研究结果表明，腐蚀显著加速裂纹的萌生和扩展，导致疲劳寿命显著降低。腐蚀介质的化学成分、环境温度和湿度以及施加的应力水平已被证明对疲劳性能有重大影响。然后，综述了研究高强钢腐蚀疲劳行为的常用实验和分析方法，并对其优缺点进行了比较和讨论。为了提高高强钢的耐腐蚀疲劳性能，提出了表面处理工艺和材料优化等措施。本文在综合文献综述和作者前期研究的基础上，对高强度钢在腐蚀环境中的疲劳性能进行了评价。展望了未来的研究方向，包括人工智能与大数据相结合的腐蚀疲劳寿命预测、多尺度评估、失效机制深入研究等。这项工作旨在支持更可靠的设计方法的发展，促进高强度钢在腐蚀性环境中的更广泛应用。

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引用次数: 0

Eccentric compression behavior of steel reinforced UHPC columns: Experiments and analysis 钢筋UHPC柱偏心受压性能：试验与分析

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-25 DOI: 10.1016/j.jcsr.2025.110143

Kun Wang , Liang Wei , Yanzhu Zhu , Huihui Luo , Xinyu Li , Zhiyu Zhu , Zaixian Chen

To study the eccentric compression performance of steel reinforced ultra-high performance concrete (UHPC) columns, static tests were conducted on six specimens under vertical loading. The tests compared the effects of factors such as eccentricity, steel ratio, slenderness ratio and longitudinal reinforcement ratio on the eccentric compression performance of specimens The results indicate that due to different eccentricities, five specimens exhibited large eccentric compression failure while one specimen experienced a small eccentric compression failure. An increase in the steel ratio and longitudinal reinforcement ratio enhances the peak load-carrying capacity of the specimens. However, an increase in eccentricity and slenderness ratio resulted in a reduction of the peak load-carrying capacity. Based on the experimental results, a finite element model for the eccentric compression of the specimens was established. A parameter analysis was conducted to extend the analysis of influencing parameters such as UHPC strength, steel strength, eccentricity, steel ratio, longitudinal reinforcement ratio and slenderness ratio. One factor at a time method was used to expand the number of parameter analysis results. Considering the effects of the steel ratio and UHPC strength, the eccentricity increase coefficient was established using the results from the expanded parameter analysis. Furthermore, based on reasonable assumptions, a calculation formula for the bearing capacity of steel reinforced UHPC columns under large eccentric compression was proposed. The predicted results showed good agreement with experimental and FE simulation values. The findings of this study provide theoretical guidance for the design and application of steel reinforced UHPC columns.

为研究钢增强超高性能混凝土柱在竖向荷载作用下的偏心受压性能，对6个试件进行了静力试验。试验比较了偏心距、配筋比、长细比和纵筋比等因素对试件偏心压缩性能的影响。结果表明：由于不同的偏心距，有5个试件出现较大的偏心压缩破坏，1个试件出现较小的偏心压缩破坏；提高配筋率和纵向配筋率可以提高试件的峰值承载能力。然而，偏心率和长细比的增加导致峰值承载能力的降低。根据试验结果，建立了试件偏心受压的有限元模型。对UHPC强度、钢强度、偏心距、钢比、纵向配筋率、长细比等影响参数进行了参数分析。采用一次一个因素的方法，扩大了参数分析结果的数量。根据展开参数分析的结果，考虑配钢率和超高混凝土强度的影响，建立了偏心增大系数。在合理假设的基础上，提出了大偏心受压条件下钢配筋UHPC柱承载力计算公式。预测结果与实验和有限元模拟值吻合较好。研究结果为钢筋UHPC柱的设计和应用提供了理论指导。

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引用次数: 0

Fracture prediction of corroded ZG300-500H cast steel under ultra-low cycle fatigue 腐蚀ZG300-500H铸钢超低周疲劳断裂预测

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-25 DOI: 10.1016/j.jcsr.2025.110144

Yan Lu , Zhenchao Yu , Peipeng Wang , Yang Li

Corrosion significantly accelerates ductile fracture in cast steels subjected to ultra-low cycle fatigue (ULCF), posing serious risks to the seismic safety of steel structures in marine or industrial environments. This study establishes a comprehensive methodology for predicting the fracture behavior of corroded ZG300-500H cast steel under ULCF loading. The approach integrates micromechanical fracture models with corrosion morphology simulation. First, the Voce–Chaboche cyclic constitutive model parameters are calibrated from ULCF tests on standard specimens to capture the cyclic mechanical response. Subsequently, three micromechanical fracture models—the Cyclic Void Growth Model (CVGM), Degraded Significant Plastic Strain (DSPS), and Improved CVGM (ICVGM)—are parameterized using smooth-notched tensile specimens and validated via finite element simulations. A random distribution corrosion pit (RDCP) model is then developed to represent realistic corroded surfaces and incorporated into the finite element framework for fracture prediction. Comparison with experimental results demonstrates that the proposed RDCP-integrated micromechanical model accurately predicts crack initiation and propagation in corroded specimens under both constant- and variable-amplitude loading. The DSPS model exhibits the highest computational efficiency and prediction accuracy, with errors within a single loading cycle. The results reveal that corrosion pits promote multi-site crack nucleation and substantially shorten ULCF life, emphasizing the necessity of considering corrosion-induced stress concentration effects in seismic performance assessments of cast steel components.

腐蚀会显著加速铸钢在超低周疲劳（ULCF）作用下的韧性断裂，对海洋或工业环境中钢结构的抗震安全构成严重威胁。本研究建立了一套综合预测腐蚀ZG300-500H铸钢在ULCF载荷下断裂行为的方法。该方法将微力学断裂模型与腐蚀形态模拟相结合。首先，从标准试件的ULCF试验中校准Voce-Chaboche循环本构模型参数，以捕获循环力学响应。随后，三种微力学断裂模型——循环空洞生长模型（CVGM）、退化显著塑性应变（DSPS）和改进的CVGM （ICVGM）——使用光滑缺口拉伸试样进行参数化，并通过有限元模拟进行验证。然后建立随机分布腐蚀坑（RDCP）模型来表示真实的腐蚀表面，并将其纳入断裂预测的有限元框架中。与试验结果对比表明，所建立的rcpp集成细观力学模型能够准确预测腐蚀试样在恒幅和变幅加载下的裂纹萌生和扩展。DSPS模型具有最高的计算效率和预测精度，误差在单个加载周期内。结果表明，腐蚀坑促进了多点裂纹形核，大大缩短了ULCF寿命，强调了在铸钢构件抗震性能评估中考虑腐蚀引起的应力集中效应的必要性。

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引用次数: 0

Study on mechanical behavior of CFST lattice tower universal-wrapped Y-joints 钢管混凝土格塔共包y形节点力学性能研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-24 DOI: 10.1016/j.jcsr.2025.110149

Miao Li , Wenkun Wang , Yang Wen , Chengjun Peng

To further optimize the structural performance of concrete-filled steel tubular lattice wind towers and explore a new and more efficient shape of joints, static tests were performed on four universal-wrapped Y-joint models. The test results show that the failure modes of these joints can be categorized into buckling failure of the web member and shear-buckling failure of the ball-bar connector. The results of finite element analysis show that when the height of the ball table is unchanged and the wall thickness of the ball table is ≤10 mm, the increase in the ultimate strength of the joints is relatively large, with a minimum value of 12.9 %. When the wall thickness of the ball table was >10 mm, the increase in the ultimate strength of the joints decreased significantly, with a maximum value of 4.8 %. When the wall thickness of the ball table was unchanged and the height of the ball table was 50–65 mm, the ultimate strength of the joints increased with increasing height of the ball table. These findings suggest that a ball table height of 65 mm and wall thickness of 10 mm are the optimal values for the practical design and use of such joints, provided that they meet the requirements for rotational capacity and strength.

为了进一步优化钢管混凝土格构风塔的结构性能，探索一种新的、更高效的节点形式，对4个通用包覆y型节点模型进行了静力试验。试验结果表明，这些节点的破坏模式可分为腹板构件的屈曲破坏和球杆连接件的剪切屈曲破坏。有限元分析结果表明，当球台高度不变，球台壁厚≤10 mm时，节点的极限强度增加较大，最小值为12.9%；当球台壁厚为10 mm时，节点的极限强度增幅明显减小，最大增幅为4.8%。当球台壁厚不变，球台高度为50 ~ 65 mm时，节点的极限强度随球台高度的增加而增加。这些结果表明，在满足旋转能力和强度要求的情况下，球台高度为65 mm，壁厚为10 mm是这种接头实际设计和使用的最佳值。

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引用次数: 0

Corrosion behaviour and tensile performance of butt-welded joints considering stress state 考虑应力状态的对接焊接接头腐蚀行为和拉伸性能

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2025-11-24 DOI: 10.1016/j.jcsr.2025.110140

Huiyun Chen , Yanchen Li , Hongbo Liu , Yuechen Xiong

Steel structures are widely used in the construction of natatorium roofs, and many in-service natatoriums have entered the later stage of their service. Due to the highly chloride ion corrosive atmospheric environment of the natatoriums and the aging of the coating at the joints, steel structures inevitably suffer from corrosion damage, resulting in weakened load-bearing capacity and even causing engineering accidents. For the commonly used Q355B butt-welded joints in steel structures, accelerated corrosion tests considering the stress state in a high chloride ion environment and uniaxial tensile tests after corrosion were carried out. The corrosion morphology and pitting corrosion characteristic parameters of the weld metal, heat-affected zone and base metal were extracted and compared. The pitting corrosion distribution model was defined and the degradation model for the mechanical characteristic parameters was proposed. A nominal constitutive model after corrosion considering the stress state was fitted, and an assessment process for the residual tensile bearing capacity considering the influence of pitting corrosion was established, providing a scientific basis for the safe use and reasonable repair of the steel structure in a highly chloride ion corrosive atmospheric environment.

钢结构在游泳馆屋顶施工中应用广泛，许多在役游泳馆已进入后期使用阶段。由于游泳馆的高氯离子腐蚀性大气环境和接缝处涂层的老化，钢结构不可避免地会受到腐蚀破坏，导致承载能力减弱，甚至造成工程事故。针对钢结构中常用的Q355B对接接头，进行了高氯离子环境下考虑应力状态的加速腐蚀试验和腐蚀后的单轴拉伸试验。提取并比较了焊缝金属、热影响区和母材的腐蚀形貌和点蚀特征参数。定义了点蚀分布模型，提出了力学特性参数的退化模型。拟合了考虑应力状态的腐蚀后名义本构模型，建立了考虑点蚀影响的钢结构残余抗拉承载力评估流程，为高氯离子腐蚀大气环境下钢结构的安全使用和合理修复提供了科学依据。

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引用次数: 0