Journal of Constructional Steel Research最新文献_第10页

Fire resistance study and design method of axial restrained Q460GJ steel columns 轴向约束Q460GJ钢柱耐火性能研究及设计方法

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.jcsr.2025.110186

Ziqi Wang , Aibing Li , Weiyong Wang

Fire performance of steel columns in real structures is influenced by end restraints and differs from that of isolated members. This paper reports a thorough experimental and numerical study of the fire resistance of Q460GJ welded H-shaped steel columns with axial restraint. A total of 6 columns were fabricated for this test, comprising two distinct configurations, with variations in parameters: slenderness ratio, load ratio, and restraint stiffness ratio. The results indicated that all the parameters have a significant impact on the restraining reaction force, subsequently affecting the fire resistance. The restrained columns with smaller slenderness ratios exhibited higher critical temperatures, with a maximum difference reaching 24.3 %. The critical temperatures decreased as the load ratio increased, with a maximum difference reaching 32.9 %, and decreased as the axial restraint stiffness ratio increased, with a difference of 10.0 %. The coupled effect of the three parameters: slenderness ratio, load ratio, and restraint stiffness ratio, was studied by conducting finite element parametric analysis. A design method was proposed by a multiple nonlinear regression analysis considering the individual effects of parameters and the influence of the second-order interaction terms. The proposed design method can accurately predict the critical temperature of axially restrained Q460GJ steel columns.

钢柱在实际结构中的防火性能受端部约束的影响，与孤立构件的防火性能不同。本文对具有轴向约束的Q460GJ焊接h型钢柱的耐火性能进行了深入的试验和数值研究。本次试验共制作了6根柱，包括两种不同的配置，参数变化：长细比、载荷比和约束刚度比。结果表明，各参数对抑制反作用力均有显著影响，进而影响耐火性能。长细比越小的约束柱的临界温度越高，最大温差达24.3%。临界温度随载荷比的增大而减小，最大差异达32.9%；随轴向约束刚度比的增大而减小，最大差异达10.0%。通过有限元参数分析，研究了长细比、载荷比、约束刚度比三个参数的耦合效应。通过多元非线性回归分析，提出了一种考虑参数个体效应和二阶交互项影响的设计方法。所提出的设计方法能够准确地预测轴向约束Q460GJ钢柱的临界温度。

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引用次数: 0

Fire performance of end-restrained circular steel tube confined reinforced concrete columns 端部约束圆形钢管约束钢筋混凝土柱的防火性能

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jcsr.2025.110187

Bochi Duan , Dongdong Yang , Faqi Liu , Hua Yang , Yong Zhu

Structural fire safety is an essential concern in the design of steel tube confined reinforced concrete (STCRC) column, an innovative type of steel-concrete composite structural member. While extensive research has been conducted and design methods are available for the fire behaviour of circular STCRC columns with pinned conditions, the fire performance of these columns with end restraints, particularly considering varying end restraints with time increasing (hereafter referred to as time-dependent restraints), remains underexplored. This study, for the first time, investigates the fire performance of circular STCRC columns in non-sway frames with end restraints via finite element analysis (FEA). The investigation covers various scenarios, including axial and rotational restraints (individually and in combination), and constant and time-dependent conditions. The effects of axial restraint ratio, rotational restraint ratio, load ratio, cross-sectional diameter, and slenderness ratio on the fire resistance of end-restrained circular STCRC columns were examined. It was observed that an increase in restraint stiffness, whether axial or rotational, markedly enhances the column's fire resistance, with improvements reaching up to 830 %. Quantitative analyses were conducted to compare the fire behaviour of columns with time-dependent restraints resulting from the stiffness degradation of adjacent beams to those with constant restraints. The cumulative negative effect of time-dependent restraints on fire resistance is generally negligible. Based on existing methods for pin-ended STCRC columns, this study develops fire resistance design recommendations for end-restrained circular STCRC columns, accounting for the beneficial effects and time-dependent degradation of end restraints on the failure axial force and buckling length.

钢管约束钢筋混凝土柱是一种新型钢-混凝土组合构件，其结构防火安全是设计中必须考虑的问题。虽然已经进行了广泛的研究，并且设计方法可用于固定条件下的圆形STCRC柱的火灾行为，但这些具有端部约束的柱的火灾性能，特别是考虑到随着时间增加而变化的端部约束（以下称为时间相关约束），仍未得到充分探索。本研究首次通过有限元分析（FEA）研究了具有端部约束的非摇摆框架中圆形STCRC柱的防火性能。研究涵盖了各种情况，包括轴向和旋转约束（单独和组合），以及恒定和时间相关的条件。研究了轴向约束比、旋转约束比、荷载比、截面直径和长细比对端约束圆形STCRC柱耐火性能的影响。据观察，约束刚度的增加，无论是轴向还是旋转，显著提高了柱的耐火性能，提高幅度高达830%。定量分析进行了比较柱的火灾行为与时间相关的约束，导致相邻梁的刚度退化与那些恒定的约束。时间依赖性约束对耐火性能的累积负面影响通常可以忽略不计。基于现有的钉端STCRC柱的设计方法，本研究提出了端部约束圆形STCRC柱的耐火设计建议，考虑了端部约束对破坏轴力和屈曲长度的有益影响和随时间的退化。

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引用次数: 0

Scale-dependent strain rate sensitivity constitutive model and fracture damage prediction for DP600 DP600尺度相关应变率敏感性本构模型及断裂损伤预测

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jcsr.2025.110168

Guoxi Jing , Jiahao Jia , Guang Chen , Xinyu Zheng , Yafei Fu , Pengsai Zhang

DP600, widely used in critical structural components like building steel beams due to its excellent seismic and impact resistance, requires accurate prediction of its plastic and fracture behavior under impact loading for building safety. This study integrates quasi-static/dynamic uniaxial tensile experiments with finite element analysis (FEA) under an uncoupled damage mechanics framework to characterize DP600's post-necking plastic deformation across strain rates and predict its sudden fracture. A strain rate-dependent weighted Ludwik-Voce (SLV) constitutive model is developed, which precisely calibrates post-necking true stress-plastic strain relationships, captures the distinct hardening mechanisms of martensite/ferrite, and reflects strain rate sensitivity. To reveal the correlation between fracture behavior and the evolution of stress state and strain path, a multi-dimensional analysis is conducted by employing the Rice–Tracey model to quantify the effect of stress triaxiality on microvoid evolution and the strain rate-dependent fracture forming limit diagram (SFFLD) to depict non-linear strain-path evolution in the major–minor plane strain space. This method achieves over 97 % agreement between FEA and experimental results for DP600's tensile fracture prediction under different strain rates. Additionally, correlation analysis between equivalent plastic strain (PEEQ) and damage variables quantitatively reveals the intrinsic relationship between damage accumulation and plastic strain development.

DP600由于具有优异的抗震和抗冲击性能，广泛应用于建筑钢梁等关键结构构件，为了建筑安全，需要准确预测其在冲击载荷下的塑性和断裂行为。本研究将准静态/动态单轴拉伸实验与非耦合损伤力学框架下的有限元分析（FEA）相结合，以表征DP600在不同应变速率下的颈后塑性变形，并预测其突然断裂。建立了应变速率相关的加权Ludwik-Voce （SLV）本构模型，该模型精确地校准了颈缩后的真应力-塑性应变关系，捕捉了马氏体/铁素体的不同硬化机制，并反映了应变速率敏感性。为了揭示断裂行为与应力状态和应变路径演化的相关性，采用Rice-Tracey模型进行了多维分析，量化了应力三轴性对微孔隙演化的影响，并采用应变率相关的断裂形成极限图（SFFLD）描述了主-小平面应变空间的非线性应变路径演化。该方法对不同应变速率下DP600的拉伸断裂预测结果与有限元分析结果的符合率达到97%以上。通过等效塑性应变（PEEQ）与损伤变量的相关性分析，定量揭示了损伤积累与塑性应变发展之间的内在联系。

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引用次数: 0

Numerical investigation on seismic performance of prefabricated self-centering RC beam-CFDST column joints 预制自定心RC梁- cfdst柱节点抗震性能数值研究

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jcsr.2025.110198

Xueyuan Yan , Jitao Yu , Genliang Wang , Wenhui Chen , Shen Shi , Bo Pan , Jie Zheng

Self-centering joints, owing to their post-earthquake recovery capacity, enable structures to exhibit higher seismic resilience. Prestressed strands are a commonly used method to achieve the self-centering function of joints; however, they currently rely largely on on-site tensioning, and mutual constraints exist between adjacent joints, which is unfavorable for the rapid repair and functional recovery of structures after earthquakes. Prefabricated methods provide an effective solution to this problem. This paper investigates the seismic performance of prefabricated self-centering (PSC) RC beam–CFDST column joints, in which the energy dissipation is achieved through web friction devices, while self-centering capability is provided by prestressed strands. Based on experimental results, a finite element model was established and validated, and on this basis, a parameter analysis was conducted to examine the impact of strand diameter, strand prestress, friction force, strand spacing, and length of the external I-beam on the PSC joints' seismic behavior. Moreover, the working mechanism of PSC joints was investigated, and the mechanical behavior of the beam–column interface under cyclic loading was analyzed. Accordingly, a theoretical hysteretic model based on the interface mechanical behavior was established, and its prediction accuracy was verified against experimental results. The results indicate that different parameters exert varying degrees of influence on the initial stiffness, load-bearing capacity, energy dissipation capacity, and self-centering ability of PSC joints. The proposed theoretical hysteretic model can effectively predict the joints' hysteretic characteristics, with the error between theoretical and experimental values of the interface moment controlled within 10 %.

自定心节点由于具有震后恢复能力，使结构具有较高的抗震能力。预应力筋是实现节点自定心功能的常用方法；但目前主要依靠现场张拉，相邻节点之间存在相互约束，不利于震后结构的快速修复和功能恢复。预制方法为解决这一问题提供了有效的方法。本文研究了预制自定心RC梁- cfdst柱节点的抗震性能，该节点通过腹板摩擦装置实现耗能，而自定心能力则由预应力链提供。在试验结果的基础上，建立并验证了有限元模型，在此基础上进行了参数分析，考察了钢绞线直径、钢绞线预应力、摩擦力、钢绞线间距和外工字梁长度对PSC节点抗震性能的影响。研究了PSC节点的工作机理，分析了循环荷载作用下的梁柱界面力学行为。据此，建立了基于界面力学行为的理论滞回模型，并与实验结果对比验证了模型的预测精度。结果表明，不同参数对PSC节点的初始刚度、承载能力、耗能能力和自定心能力均有不同程度的影响。所建立的理论滞回模型能有效地预测关节的滞回特性，界面弯矩的理论值与实验值的误差控制在10%以内。

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引用次数: 0

Analysis of bond performance between square hollow steel tubes and UHTCC interfaces 方空心钢管与UHTCC界面粘结性能分析

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-30 DOI: 10.1016/j.jcsr.2025.110205

Bing Wang , Ze-Long Sun , Qing-Xin Ren , Yuan-Hong Zhu , Jia-Hui Wang

This study investigates the bond performance at the interface between square hollow steel tubes and ultra-high-toughness cementitious composites (UHTCC). Specimens with varying slenderness and width-to-thickness ratios were evaluated using push-out tests. The study analyses damage patterns, longitudinal strain distribution curves, load–slip curves, bonding mechanisms, interfacial bond strength distribution, and microstructure. The results indicate that bond-slip failure occurs at the bonding interface of the steel tube and UHTCC. Strain curve demonstrates an exponential decrease along the length of the specimen, and the load–slip curve reveals the stages of bonding, slip, and friction. The bond strength initially increases and subsequently decreases as the slenderness ratio increases. Conversely, it decreases as the width-to-thickness ratio increases. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were utilised to investigate microstructure. A finite element model was constructed for the composite structure, in which the stress distribution patterns and load–slip behaviour of the steel tube exhibited strong consistency with the test results. A bond strength distribution equation for the interface was derived, along with fitting equations with respect to bond strength and load. To extend the findings, a finite element model was constructed under linear elasticity to investigate interfacial changes. This study provides a solid theoretical foundation for designing square hollow steel tube–UHTCC composite structures.

研究了方空心钢管与超高韧性胶凝复合材料（UHTCC）界面的粘结性能。采用推出试验对具有不同长细比和宽厚比的试样进行了评估。研究分析了损伤模式、纵向应变分布曲线、载荷-滑移曲线、粘结机制、界面粘结强度分布和微观结构。结果表明：粘结滑移破坏发生在钢管与超高压混凝土的粘结界面。应变曲线沿试样长度呈指数递减，载荷-滑移曲线呈现粘结、滑移和摩擦阶段。随着长细比的增大，粘结强度先增大后减小。相反，它随着宽厚比的增加而减小。利用扫描电子显微镜（SEM）和x射线衍射仪（XRD）对其微观结构进行了研究。建立了复合材料结构的有限元模型，模型中钢管的应力分布模式和荷载-滑移行为与试验结果具有较强的一致性。导出了界面的结合强度分布方程，并给出了结合强度与载荷的拟合方程。为了扩展上述发现，在线弹性条件下建立了一个有限元模型来研究界面的变化。该研究为设计方形空心钢管-超高压混凝土组合结构提供了坚实的理论基础。

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引用次数: 0

Elastic buckling of pre-stressed stayed columns with unevenly spaced and inclined cross-arms 斜横臂不均匀间距预应力斜拉柱的弹性屈曲

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-22 DOI: 10.1016/j.jcsr.2025.110209

Fengping Zhang , Moon-Young Kim

Pre-stressed (PS) stayed columns having inclined cross-arms are taken into account which are in contrast to the conventional stayed column models with vertical arms. Firstly, a linear analysis procedure to determine internal forces of the stayed column models with double and triple inclined arms under compression is presented using complementary energy principle. After that, analytical solutions for evaluating their elastic buckling loads are newly derived with minimum nodal displacements and internal forces in which the second-order effects are rigorously considered. Solutions by this study are validated through comparison with numerical results by FEM. Finally, a parametric study is performed to explore effects of evenly/unevenly spaced cross-arms, height of cross-arms, and sectional areas of stay cables on elastic buckling strength of the PS columns. Particularly, contrary to the vertical arm models, it is found that elastic buckling strength of the column models with inclined cross-arms could be to a great extent improved by making the edge span length shorter than the middle span of the main column and their central height greater than one tenth the main column length.

预应力（PS）柱斜交臂考虑，这是与传统的斜交臂的柱模型的对比。首先，利用互补能量原理，建立了双斜臂和三斜臂斜拉柱受压内力的线性分析方法。在此基础上，重新推导了考虑二阶效应的最小节点位移和内力的弹性屈曲载荷解析解。通过与有限元数值计算结果的比较，验证了本文方法的正确性。最后，进行了参数化研究，探讨了均匀/不均匀横臂间距、横臂高度和斜拉索截面积对PS柱弹性屈曲强度的影响。特别是，与垂直臂模型相反，斜横臂柱模型的弹性屈曲强度可以在很大程度上提高，使其边跨长度小于主柱的中间跨度，中心高度大于主柱长度的十分之一。

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引用次数: 0

Inelastic numerical analysis-based optimal design of longitudinal stiffeners in steel web plates 基于非弹性数值分析的钢腹板纵向加强筋优化设计

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-22 DOI: 10.1016/j.jcsr.2025.110201

Jing-Lin Xiao , Jian Liu , Yu-Fei Liu , Jian-Sheng Fan

In this study, the optimal design of longitudinal stiffeners in steel web plates is investigated based on inelastic numerical analysis. Unlike previous research that was predominantly based on elastic eigenvalue buckling analysis, a nonlinear finite element analysis using ABAQUS is integrated with an optimisation framework implemented in MATLAB to determine the optimal locations and minimum required flexural rigidities of longitudinal stiffeners. Parametric studies are conducted on web plates reinforced with one to three longitudinal stiffeners under pure bending and pure shear, across a wide range of aspect ratios. Through comparisons with existing studies and design codes based on elastic eigenvalue buckling analysis, new insights into the design of longitudinal stiffeners are revealed. For instance, the obtained optimal stiffener locations of singly- and doubly-stiffened plates under pure bending are generally closer to the compressed edges than those recommended by elastic eigenvalue buckling analysis. Moreover, the influence of the aspect ratio and the number of longitudinal stiffeners on the bending resistance and shear resistance of optimally stiffened plates is examined. The bending resistance of the optimally stiffened plates is only slightly influenced by the aspect ratio, and can be substantially improved by adding longitudinal stiffeners, with the most pronounced benefits observed when increasing from one to two stiffeners. The shear resistance of the optimally stiffened plate generally decreases with increasing the aspect ratio, and can be enhanced by adding longitudinal stiffeners. Design recommendations are proposed based on these findings, offering substantial practical value for the stiffening of large cross-section steel box girders.

基于非弹性数值分析方法，对钢腹板纵向加强筋的优化设计进行了研究。与以往主要基于弹性特征值屈曲分析的研究不同，使用ABAQUS的非线性有限元分析与MATLAB中实现的优化框架相结合，以确定纵向加强筋的最佳位置和最小所需的弯曲刚度。参数研究进行了腹板与一至三个纵向加强筋在纯弯曲和纯剪切下，在宽宽比范围内。通过与现有研究和基于弹性特征值屈曲分析的设计规范的比较，揭示了纵向加筋设计的新见解。例如，得到的单加筋和双加筋板在纯弯曲下的最优加筋位置通常比弹性特征值屈曲分析推荐的位置更接近压缩边缘。此外，还考察了纵筋比和纵筋个数对优化加筋板抗弯和抗剪性能的影响。优化加筋板的抗弯性能仅受长径比的轻微影响，通过添加纵向加筋可以大大提高抗弯性能，当从一个加筋增加到两个加筋时，效果最为明显。优化加筋板的抗剪承载力一般随长径比的增大而减小，可通过增加纵向加筋来增强。在此基础上提出了设计建议，对大截面箱梁的加劲具有重要的实用价值。

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引用次数: 0

Comprehensive review of shear resistance and web stiffeners design in plate girders 板梁抗剪和腹板加劲设计综述

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.jcsr.2025.110166

Sergio Nascimento , Filip Ljubinković , João P. Martins , José J. Oliveira Pedro

This paper presents a comprehensive review of the role of transverse, longitudinal, and diagonal web stiffeners in enhancing the shear buckling resistance of I-shaped steel plate girders. Over the past few decades, extensive laboratory experiments, analytical formulations, and numerical analyses have been conducted to better understand the shear behaviour of stiffened webs, supporting the development of more efficient and reliable design methods.

The review summarises and critically compares the main design models for elastic buckling and ultimate shear resistance, as well as the essential design requirements for web stiffeners. Key investigations are compiled in detailed tables, and existing analytical expressions are examined in terms of their assumptions, boundary conditions, and accuracy.

In addition, a finite element (FE) model is developed to evaluate the shear performance of girders with different stiffener configurations – including transverse, longitudinal, or diagonal – and its predictions are benchmarked against available design methods. The FE results complement the literature findings by highlighting general trends, verifying analytical formulations, and assessing the conservatism of current design rules.

Overall, the study demonstrates that while existing models predict the shear buckling resistance of stiffened plate girders reasonably well, notable gaps remain regarding the interaction between stiffeners, the treatment of diagonal stiffeners, and the influence of torsional rigidity. The review identifies these challenges and outlines future directions for improving both the accuracy and efficiency of web stiffener design.

本文全面介绍了横向、纵向和对角腹板加强筋在提高工字钢板梁抗剪切屈曲能力方面的作用。在过去的几十年里，大量的实验室实验、分析公式和数值分析已经进行，以更好地了解加劲腹板的剪切行为，支持更有效和可靠的设计方法的发展。本文总结并比较了弹性屈曲和极限抗剪的主要设计模型，以及腹板加强筋的基本设计要求。关键调查汇编在详细的表格中，现有的分析表达式在其假设，边界条件和准确性方面进行了检查。此外，开发了一个有限元（FE）模型来评估具有不同加劲筋配置的梁的剪切性能-包括横向，纵向或对角线-其预测是针对现有设计方法的基准。有限元结果通过强调一般趋势、验证分析公式和评估当前设计规则的保守性来补充文献发现。总体而言，研究表明，虽然现有模型对加劲板梁的抗剪切屈曲能力预测得相当好，但在加劲筋之间的相互作用、对角加劲筋的处理以及扭转刚度的影响方面仍存在明显的差距。本文指出了这些挑战，并概述了提高腹板加劲设计精度和效率的未来方向。

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引用次数: 0

Flexural behavior of Concrete-Filled Steel Tubular (CFST) beams with T-shaped flange 带t形法兰的钢管混凝土梁的受弯性能

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI: 10.1016/j.jcsr.2025.110169

Dejun Liu , Ximing Wang , Huan Liu , Jianping Zuo , Weiping Zhao , Mingyao Li , Yanjun Liu

This study combines T-shaped flange steel beams and circular concrete-filled steel tubular (CFST) beams to develop a novel structural form of concrete-filled steel tubular (CFST) beams incorporating a T-shaped flange (abbreviated as CFST beams with T-shaped flange). The flexural load-bearing performance of CFST beams with T-shaped flange and conventional CFST beams was comparatively analyzed through four-point bending tests. Building upon this foundation and validated against experimental results, a reasonable numerical model for CFST beams with T-shaped flange was established, followed by parametric sensitivity analysis. Finally, a calculation method for the normal cross-sectional bearing capacity of CFST beams with T-shaped flange was proposed and validated by experimental and numerical results. The findings demonstrate that, compared with conventional CFST beams, the yield load and the flexural bearing capacity of CFST beams with T-shaped flange have been increased by up to 88.76 % and 71.49 %, respectively; The T-shaped flange exerts a dual strengthening effect on the flexural load-bearing performance of CFST beams: the T-shaped flange itself enhances the structural bending performance while simultaneously inducing an inferior shift of the sectional neutral axis, thereby effectively activating its flexural potential; At identical steel consumption, T-shaped flange dimensions most significantly govern the flexural load-bearing performance of CFST beams with T-shaped flange. Parametric sensitivity increases sequentially as follows: web thickness, flange width, flange thickness, and web height.

本研究将t形翼缘钢梁与圆形钢管混凝土（CFST）梁相结合，开发了一种新型的t形翼缘钢管混凝土（CFST）梁（简称CFST梁+ t形翼缘）结构形式。通过四点弯曲试验，对比分析了t形法兰钢管混凝土梁与普通钢管混凝土梁的抗弯承载性能。在此基础上，通过对试验结果的验证，建立了合理的t型法兰钢管混凝土梁的数值模型，并进行了参数敏感性分析。最后，提出了一种t型法兰钢管混凝土梁正截面承载力的计算方法，并通过试验和数值结果进行了验证。结果表明：与普通钢管混凝土梁相比，t形翼缘钢管混凝土梁的屈服荷载和抗弯承载力分别提高了88.76%和71.49%；t形翼缘对CFST梁的抗弯承载性能具有双重增强作用：t形翼缘本身增强了结构的抗弯性能，同时引起截面中性轴的下移，从而有效激活其抗弯潜力；在钢材消耗相同的情况下，t型法兰尺寸对t型法兰钢管混凝土梁的抗弯承载性能影响最为显著。参数灵敏度依次增加如下：腹板厚度、法兰宽度、法兰厚度和腹板高度。

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引用次数: 0

Performance-based-plastic-design of truss-moment frames incorporating rotary dampers with two-stage energy-dissipation mechanism 带两级耗能机构旋转阻尼器的桁架弯矩框架的性能塑性设计

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

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.jcsr.2025.110206

Zeyu Zhou, Yanzu Zeng, Xuhong Zhou, Xiuzhang He, Ke Ke

To enhance the energy-dissipation efficiency of truss-moment frame (TMF) under varying seismic intensities, this study incorporates rotary dampers with a two-stage energy-dissipation mechanism (TSRDs) into TMF and develops a performance-based plastic design (PBPD) methodology that explicitly considers seismic responses under both design basis earthquakes (DBE) and maximum considered earthquakes (MCE). The probabilistic characteristics of seismic input energy demand for TMFs equipped with TSRDs (TMF-TSRDs) are quantified using machine learning techniques based on equivalent single-degree-of-freedom systems exhibiting quadri-linear hysteretic behaviour. Design equations for TMF-TSRDs are then derived based on work-energy balance concept using subassemblage models extracted from the global structure, enabling the proportion of dampers and structural members according to energy demands for both DBE and MCE scenarios. After that, a stepwise iterative procedure is proposed to facilitate the practical application of the PBPD methodology. Numerical simulations are conducted to evaluate the seismic performance of two prototype TMF-TSRD structures designed using the proposed procedure. Pushover analyses confirm that the design equations effectively predict the quadri-linear behaviour of both prototype structures, aligning well with the design targets. Nonlinear time-history analyses further demonstrate that maximum inter-storey drifts remain within predefined limits under both DBE and MCE conditions, validating the effectiveness of the proposed PBPD methodology.

为了提高桁架-弯矩框架（TMF）在不同地震烈度下的耗能效率，本研究将具有两级耗能机制（tsrd）的旋转阻尼器纳入TMF，并开发了一种基于性能的塑性设计（PBPD）方法，该方法明确考虑了设计基础地震（DBE）和最大考虑地震（MCE）下的地震反应。使用基于具有四线性滞后行为的等效单自由度系统的机器学习技术，对配备tsrd的tmf （tmf - tsrd）的地震输入能量需求的概率特征进行了量化。然后，利用从整体结构中提取的子组合模型，基于工作-能量平衡概念推导出tmf - tsrd的设计方程，从而根据DBE和MCE两种情况的能量需求确定阻尼器和结构构件的比例。在此基础上，提出了逐步迭代的方法，促进了PBPD方法的实际应用。通过数值模拟对采用该方法设计的两个原型TMF-TSRD结构的抗震性能进行了评价。Pushover分析证实，设计方程有效地预测了两种原型结构的二次线性行为，与设计目标很好地吻合。非线性时程分析进一步表明，在DBE和MCE条件下，最大层间漂移都保持在预定义的范围内，验证了所提出的PBPD方法的有效性。

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引用次数: 0