Journal of Constructional Steel Research最新文献_第6页

Control accuracy and sensitivity of a double rhombic-strut adaptive beam string structure 双菱形支杆自适应梁弦结构的控制精度和灵敏度

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

Journal of Constructional Steel Research

Pub Date : 2024-11-15 DOI: 10.1016/j.jcsr.2024.109166

Jun Zou , Jinyu Lu , Na Li , Haichen Zhang , Zhicheng Sha , Zhiyin Xu

The control accuracy and sensitivity of active struts in traditional adaptive beam string structures (ABSS) pose significant challenges to meeting the control requirements in different working states, which will seriously limit its adaptability to various external environments. To address this issue, a double rhombic active strut adaptive beam string structure (DRSABSS) was developed. To analyze the working mechanism of the double rhombic active strut and its feasibility in structural active control, its geometric deformation model was established, and the design formula was derived. The experiments and numerical simulations were conducted on a scaled model of the DRSABSS under different load cases. A control strategy that minimizes displacement considering control accuracy and sensitivity was proposed based on a genetic algorithm (GA). The test and simulation results showed that the initial angle of the double rhombic active strut was a crucial factor in determining its control function, and the accuracy of its design formula was verified. Additionally, the structural responses were significantly reduced after active control, and the double rhombic active struts can improve the structural control accuracy and sensitivity simultaneously, and the flexible switching of control modes under different requirements in real-time can be achieved. The test results were in good agreement with the simulation results. The rhombic amplification mechanism of DRSABSS proposed in this paper provides a new approach to improve the control accuracy and sensitivity of adaptive structures, and it can be applicable to the control requirements under different loads.

传统自适应梁串结构（ABSS）中的主动支柱的控制精度和灵敏度对满足不同工作状态下的控制要求提出了巨大挑战，这将严重限制其对各种外部环境的适应性。为解决这一问题，我们开发了一种双菱形主动支柱自适应梁串结构（DRSABSS）。为了分析双菱形主动支柱的工作机理及其在结构主动控制中的可行性，建立了其几何变形模型，并推导出设计公式。在不同载荷情况下，对 DRSABSS 的比例模型进行了实验和数值模拟。基于遗传算法（GA），提出了一种兼顾控制精度和灵敏度的位移最小化控制策略。试验和模拟结果表明，双菱形主动支撑的初始角度是决定其控制功能的关键因素，其设计公式的准确性也得到了验证。此外，主动控制后结构响应明显降低，双菱形主动支撑可同时提高结构控制精度和灵敏度，并可实现不同要求下控制模式的实时灵活切换。试验结果与仿真结果吻合良好。本文提出的 DRSABSS 的菱形放大机制为提高自适应结构的控制精度和灵敏度提供了一种新方法，可适用于不同载荷下的控制要求。

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引用次数: 0

Post-fire compressive performance of basalt fiber recycled aggregate concrete filled steel tube 填充钢管的玄武岩纤维再生骨料混凝土的火后抗压性能

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

Journal of Constructional Steel Research

Pub Date : 2024-11-15 DOI: 10.1016/j.jcsr.2024.109164

Qinglin Jia , Lin Xiao , Heng Liu , Xing Wei , Zhirui Kang

This study reports the results of post-fire axial compressive tests on 87 basalt fiber recycled aggregate concrete (BFRAC) cubes and 25 basalt fiber recycled aggregate concrete filled steel tube (BF-RACFST) short columns. The variables were temperature (20, 300, 500, and 800 °C), recycled aggregate replacement ratio (0, 50, and 100 %), basalt fiber content (0, 4, and 8 kg/m³), and cooling method. The specimens were firstly heated at constant high temperatures. After cooling to room temperature, the axial compression tests were conducted. The findings revealed that recycled aggregate prevented explosive spalling of BFRAC but reduced the post-fire capacity and stiffness of BF-RACFST. Adding basalt fiber increased the compressive strength of BFRAC cubes, decreased BF-RACFST post-fire capacity, and slightly increased the post-fire compressive stiffness of the short columns. After cooling in water, the load and failure capacity of BF-RACFST were lower than those of natural cooling. Since structures are employed in the elastic phase under normal working conditions, adding basalt fiber can compensate for the compressive stiffness loss caused by recycled aggregate in concrete filled steel tubes after high temperatures. However, the reduction in capacity safety reserves should be considered when designing and post-fire repairing. If circumstances allow, rapid cooling methods, such as water cooling, should be avoided during fire extinguishing to reduce structural strength loss. Eventually, a design model was built to calculate the residual strength, compressive stiffness, and peak strain of the post-fire BF-RACFST short columns.

本研究报告了 87 个玄武岩纤维再生骨料混凝土（BFRAC）立方体和 25 个玄武岩纤维再生骨料混凝土填充钢管（BF-RACFST）短柱的火后轴向抗压试验结果。试验变量包括温度（20、300、500 和 800 °C）、再生骨料替代率（0、50 和 100 %）、玄武岩纤维含量（0、4 和 8 kg/m3）以及冷却方法。试样首先在恒定高温下加热。冷却至室温后，进行轴向压缩试验。试验结果表明，再生骨料可防止 BFRAC 发生爆炸剥落，但降低了 BF-RACFST 的火后承载力和刚度。添加玄武岩纤维提高了 BFRAC 立方体的抗压强度，降低了 BF-RACFST 的火后承载力，并略微提高了短柱的火后抗压刚度。在水中冷却后，BF-RACFST 的荷载和破坏能力均低于自然冷却时的荷载和破坏能力。由于结构在正常工作条件下处于弹性阶段，添加玄武岩纤维可以补偿混凝土填充钢管在高温后由再生骨料造成的抗压刚度损失。不过，在设计和火灾后修复时应考虑容量安全储备的减少。在条件允许的情况下，灭火时应避免采用水冷等快速冷却方法，以减少结构强度损失。最终，建立了一个设计模型来计算火灾后 BF-RACFST 短柱的残余强度、抗压刚度和峰值应变。

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引用次数: 0

Damage evolution of steel-UHPC composite beams using AE and DIC techniques 使用 AE 和 DIC 技术分析钢-UHPC 复合梁的损伤演变过程

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

Journal of Constructional Steel Research

Pub Date : 2024-11-15 DOI: 10.1016/j.jcsr.2024.109163

Ye Tian , Duo Liu , Xudong Chen , Xuyang Wang , Jiandong Zhang

The incorporation of Ultra-High-Performance Concrete (UHPC) in steel-concrete composite beams presents an outstanding solution for reducing crack propagation and enhancing ductility. In this study, three-point bending tests were combined with acoustic emission (AE) and digital image correlation (DIC) diagnostics to study the damage evolution in corrugated steel web I-beam UHPC composite beams. A clustering analysis method based on RA-AF-RC parameters was developed, and b-values and Kolmogorov-Sinai entropy were used for early warning analyses. The findings indicated that UHPC significantly enhanced the crack control capability of corrugated steel web I-beam UHPC composite beams. AE ringing counts and energy clearly indicated distinct, identifiable changes at various damage stages, serving as optimal AE monitoring parameters. AE clustering parameters were determined through principal component analysis and Laplacian scores, with K-means algorithm analysis confirming the alignment with actual crack patterns. K-entropy analyses provided early warnings for cracks, yielding, and failures, showing that b-values can effectively predict structural failures and that K-entropy is also effective in early warnings for structural cracks, yielding, and failures. This AE monitoring method offers a superior alternative to traditional monitoring methods, enabling real-time monitoring and early warning for damage evolution in composite beams.

在钢-混凝土复合梁中掺入超高性能混凝土（UHPC）是减少裂缝扩展和提高延性的出色解决方案。在本研究中，三点弯曲试验与声发射（AE）和数字图像相关（DIC）诊断相结合，研究了波纹钢腹板工字钢 UHPC 复合梁的损伤演变。开发了基于 RA-AF-RC 参数的聚类分析方法，并使用 b 值和 Kolmogorov-Sinai 熵进行预警分析。研究结果表明，UHPC 显著增强了波纹钢腹板工字形 UHPC 复合梁的裂缝控制能力。AE 振铃次数和能量清楚地表明了不同损伤阶段的明显、可识别的变化，可作为最佳 AE 监测参数。通过主成分分析和拉普拉斯分数确定了 AE 聚类参数，K-means 算法分析确认了与实际裂纹模式的一致性。K-熵分析为裂缝、屈服和失效提供了早期预警，表明 b 值可有效预测结构失效，K-熵也可有效预警结构裂缝、屈服和失效。这种 AE 监测方法提供了一种优于传统监测方法的替代方法，可对复合梁的损伤演变进行实时监测和预警。

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引用次数: 0

Structural safety risk prediction method for terminal building steel roof construction considering spatial and temporal variations 考虑时空变化的航站楼钢结构屋顶结构安全风险预测方法

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109126

Zhansheng Liu , Chengkuan Ji , Guoliang Shi , Yanchi Mo

In the field of aviation, terminal building renovation and expansion projects frequently involve complex construction processes and the structure is in a non-static state during the construction process, resulting in significant safety risks accompanying these processes. In order to visualize and efficiently demonstrate the construction of airport terminal building renovation and expansion, and to provide a rapid decision-making analysis tool for the control of structural safety risks, a digital twin model for safety risk prediction of steel mesh frame structures is proposed. On this basis, taking the construction situation of an airport as an example, sensors were installed according to the results of the analysis of the finite element model, and a prediction model was established using the height parameters of twelve hydraulic jacks, the ambient temperature data and the stress data, in order to predict the stress changes of the key rods of the steel mesh frame. The results show that the proposed prediction model can accurately capture the stress distribution of the steel mesh frame during the overall jacking process. The stress prediction accuracy can reach 98 % for the key bars. Through this method combining digital twin and machine learning, this study provides a new perspective for safety risk management in airport terminal building renovation and expansion projects, and verifies its applicability and effectiveness in actual projects through empirical studies.

在航空领域，航站楼改扩建工程往往涉及复杂的施工工序，且施工过程中结构处于非静态状态，导致这些工序伴随着巨大的安全风险。为了直观、高效地展示机场航站楼改扩建工程的施工过程，为控制结构安全风险提供快速决策分析工具，提出了钢网架结构安全风险预测的数字孪生模型。在此基础上，以某机场的施工情况为例，根据有限元模型的分析结果安装传感器，利用十二台液压千斤顶的高度参数、环境温度数据和应力数据建立预测模型，以预测钢网架关键杆件的应力变化。结果表明，所提出的预测模型能够准确捕捉到钢网架在整个顶升过程中的应力分布。关键杆件的应力预测精度可达 98%。本研究通过数字孪生和机器学习相结合的方法，为机场航站楼改扩建项目的安全风险管理提供了新的视角，并通过实证研究验证了其在实际项目中的适用性和有效性。

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引用次数: 0

Experimental investigation on fatigue crack growth performance of Q690D steel butt weld Q690D 钢对接焊缝疲劳裂纹生长性能的实验研究

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109151

Xiaodi Guan , Hongchao Guo , Yang Chen , Dixiong Yang , Yue Zhao

Fatigue damage of welded joints is gradually becoming one of the key problems affecting the service safety of steel bridges under repeated vehicle loads. The fatigue crack growth rate (FCGR) tests of compact tensile (CT) specimens of two plate thicknesses under three stress ratios were carried out with Q690D high strength steel (HSS) butt weld (BW) in this paper. The FCGR and fatigue crack growth threshold (FCGT) under different stress ratios were obtained. Expressions for the FCGR and FCGT that can synthesize the effects of stress ratio were established. A new method to determine the crack closure parameters of Q690D HSS BW was also given. On the basis of McEvily model, the calculation formula of FCG for Q690D HSS BW was derived. The results show that the Q690D HSS BW of this batch have good FCG performance. And the greater the plate thickness, the better the FCG performance of the specimens taken perpendicular to the rolling direction. The FCGR recommended by BS7910 specification is 1.71–2.92 times that of the Q690 HSS BW in this study. The FCGR increases with the increase of stress ratio. When the stress ratio increases from 0.1 to 0.2, the FCGR increases by 49.48 %, whereas FCGR increases by 129.65 % when the stress ratio increases from 0.2 to 0.5. The stress ratio has a greater influence on the FCGR parameters for plates of smaller thickness. And the FCGT decreases linearly with the increase of stress ratio.

在反复的车辆荷载作用下，焊接接头的疲劳破坏正逐渐成为影响钢结构桥梁使用安全的关键问题之一。本文以 Q690D 高强度钢（HSS）对接焊缝（BW）为研究对象，进行了三种应力比下两种板厚紧凑拉伸（CT）试样的疲劳裂纹生长率（FCGR）试验。得出了不同应力比下的 FCGR 和疲劳裂纹增长阈值（FCGT）。建立了能综合应力比影响的 FCGR 和 FCGT 表达式。此外，还给出了一种确定 Q690D 高速钢 BW 裂纹闭合参数的新方法。在 McEvily 模型的基础上，得出了 Q690D 高速钢生坯 FCG 的计算公式。结果表明，该批 Q690D 高速钢生坯具有良好的 FCG 性能。而且板厚越大，垂直于轧制方向的试样 FCG 性能越好。BS7910 规范推荐的 FCGR 是本研究中 Q690 高速钢白车身的 1.71-2.92 倍。FCGR 随应力比的增加而增加。当应力比从 0.1 增加到 0.2 时，FCGR 增加了 49.48%，而当应力比从 0.2 增加到 0.5 时，FCGR 增加了 129.65%。对于厚度较小的板材，应力比对 FCGR 参数的影响更大。而 FCGT 随应力比的增加呈线性下降。

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引用次数: 0

Collaborative form-finding of multiple treelike column structures based on improved numerical inverse hanging method 基于改进型数值反吊法的多树形柱结构协同找形

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109165

Wenfeng Du , Qichen Wang , Hongjing Xue , Boqing Gao , Shilin Dong , Mijia Yang

The mechanical properties of treelike column structures are greatly influenced by their forms, emphasizing the importance of form optimization. However, previous studies have primarily focused on optimizing the morphology of individual treelike column, neglecting the interaction of multiple column structures. This oversight leads to deviation in the optimal morphology. In order to investigate the impact of the deviation on the performances of structures, the collaborative form-finding analysis of multiple column structures has been carried out using improved Numerical Inverse Hanging Method (NIHM). This research is based on the design of a large-span roof structure supported by 8 treelike column structures at the terminal of Dalian Jinzhou Bay Airport. Firstly, the traditional NIHM was improved to achieve collaborative form-finding of multiple treelike column structures. Then the differences between collaborative form-finding analysis of multi columns and individual analysis of single column were discussed in depth. Comparative results show collaborative form-finding exhibits more reasonable over individual form-finding. In the case where all joints are located on one side of the fixed end, the results of individual form-finding are similar to those of the initial model, while collaborative form-finding shows a significant enhancement in mechanical performance. Notably, when there exists a substantial height discrepancy among branch joint, collaborative form-finding achieves a displacement reduction of 21 % compared to individual form-finding, along with a reduction of 35 % in maximum equivalent stress.

树状柱结构的机械性能在很大程度上受其形态的影响，这就强调了形态优化的重要性。然而，以往的研究主要集中于优化单个树状柱的形态，而忽略了多个柱结构之间的相互作用。这一疏忽导致了最佳形态的偏差。为了研究这种偏差对结构性能的影响，我们采用改进的数值反吊法（NIHM）对多柱结构进行了协同寻形分析。本研究以大连金州湾机场航站楼 8 个树状柱结构支撑的大跨度屋顶结构设计为基础。首先，对传统的 NIHM 进行了改进，以实现多个树状柱结构的协同找形。然后，深入讨论了多柱协同找形分析与单柱单独找形分析之间的差异。比较结果表明，协同找形比单独找形更合理。在所有接缝都位于固定端一侧的情况下，单个找模的结果与初始模型的结果相似，而协同找模则显著提高了力学性能。值得注意的是，当分支接头之间存在较大高度差异时，协同找形比单独找形的位移减少了 21%，最大等效应力减少了 35%。

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引用次数: 0

Study on bolt loosening mechanism under transverse load considering slip and adhesion status of contact surfaces 考虑接触面滑移和粘附状态的横向载荷下螺栓松动机理研究

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109149

Liangming Sun , Shuguang Liu , Umar Muhammad , Hanbing Zhao

The complexity of the thread surface makes it challenging to analyze the mechanism of bolt loosening from a mechanical perspective. To analyze the mechanism of bolt loosening, this paper proposes a mathematical model. Initially, the characteristics of the threaded surface are precisely represented using cylindrical and Cartesian coordinate systems, and the contact relationship of the thread contact surface is derived through normal and tangential vectors. Subsequently, the integral expressions for friction force and torque under transverse load are derived. The results indicate that as the frictional force between the contact surfaces increases, the torque caused by the friction force gradually decreases. Complete slip occurs when the frictional force reaches the critical value, at which point the torque is essentially at its minimum. Furthermore, the comparison between theoretical and finite element results demonstrates that the derived formulas can qualitatively express the loosening mechanism of the bolt under transverse load. Parametric analysis shows that the greater the transverse amplitude, the more likely the contact surfaces will slip. Slip reduces the resistance torque between the contact surfaces, leading to bolt loosening. Increasing the friction coefficient of the thread contact surface and ensuring that the friction coefficient of the bolt head contact surface is sufficiently different from that of the thread contact surface can effectively prevent bolt loosening. This strategy ensures that at least one contact surface maintains adhesion during vibrations, sustaining an adequate resisting torque to counteract loosening.

螺纹表面的复杂性使得从力学角度分析螺栓松动机理具有挑战性。为了分析螺栓松动的机理，本文提出了一个数学模型。首先，使用圆柱坐标系和直角坐标系精确表示螺纹表面的特征，并通过法向量和切向量推导出螺纹接触面的接触关系。随后，推导出横向载荷下摩擦力和扭矩的积分表达式。结果表明，随着接触面之间摩擦力的增加，摩擦力引起的扭矩逐渐减小。当摩擦力达到临界值时，就会发生完全滑移，此时扭矩基本达到最小值。此外，理论结果与有限元结果的比较表明，推导出的公式可以定性地表达横向载荷下螺栓的松动机理。参数分析表明，横向振幅越大，接触面越容易滑动。滑移会降低接触面之间的阻力矩，导致螺栓松动。增加螺纹接触面的摩擦系数，并确保螺栓头接触面的摩擦系数与螺纹接触面的摩擦系数有足够大的差异，可有效防止螺栓松动。这种策略可确保在振动过程中至少有一个接触面保持附着力，从而维持足够的抵抗扭矩以抵消松动。

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引用次数: 0

Global buckling analysis of IFC-protected steel members with irregular sections under fire 受 IFC 保护的不规则截面钢构件在火灾中的全局屈曲分析

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109158

Guanhua Li , Zi-Zhang Gu , Erfeng Du , Si-Wei Liu , Yao-Peng Liu , Siu-Lai Chan

Intumescent fire coating (IFC) is currently the major passive protection of steel structures under fire. However, the buckling behavior of IFC-protected steel members with irregular sections under fire has not been systematically quantified in existing studies. The high cost of fire tests and the cumbersome nature of coupled thermal-stress analysis hinder extensive research on these members. This study proposes an improved algorithm to analyze the global buckling behavior of IFC-protected steel members with irregular sections under fire. The temperature field is calculated using a refined finite-element-based heat transfer analysis method that accounts for the equivalent thermal conductivity of IFC. Based on the temperature field, a cross-section analysis algorithm is proposed to determine the cross-sectional properties of the members, incorporating warping and Wagner effects due to the thermal gradients. The proposed thermal deterioration triangle element can reduce the error in calculating the cross-sectional properties by up to 3.98 % compared to traditional method while achieving higher efficiency. Parametric studies, comprising a total of 3168 analyses, reveal that fire exposure time, dry film thickness and section factor are the primary influencing factors. By summarizing the fire exposure times corresponding to 20 % and 80 % reductions in buckling capacity, an approximate evaluation equation is provided. Moreover, the proposed approach is integrated into a new software MSASect2 to offer a user-friendly tool.

膨胀型防火涂料（IFC）是目前钢结构在火灾中的主要被动保护措施。然而，在现有的研究中，还没有系统地量化受 IFC 保护的不规则截面钢结构在火灾中的屈曲行为。火灾试验的高成本和热应力耦合分析的繁琐阻碍了对这些构件的广泛研究。本研究提出了一种改进算法，用于分析受 IFC 保护的不规则截面钢构件在火灾中的整体屈曲行为。温度场的计算采用基于有限元的精细传热分析方法，该方法考虑了 IFC 的等效导热系数。在温度场的基础上，提出了一种截面分析算法来确定构件的截面特性，并将热梯度引起的翘曲和瓦格纳效应纳入其中。与传统方法相比，所提出的热劣化三角形元素可将计算截面特性的误差减少达 3.98%，同时实现更高的效率。参数研究共进行了 3168 次分析，结果表明，火灾暴露时间、干膜厚度和截面系数是主要的影响因素。通过总结屈曲能力降低 20% 和 80% 所对应的火灾暴露时间，提供了一个近似的评估方程。此外，还将所提出的方法集成到新软件 MSASect2 中，以提供一个用户友好型工具。

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引用次数: 0

Axial compressive behavior of stone encased concrete-filled square steel tube stub columns 石包混凝土方钢管桩柱的轴向抗压行为

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

Journal of Constructional Steel Research

Pub Date : 2024-11-14 DOI: 10.1016/j.jcsr.2024.109134

Yang Liu , Jie Liu , Xiaojuan Liu , Chaozhong Zhang

A novel type of stone prism encased concrete-filled steel tube (SCFST) column is proposed by inserting waste stone prisms into the cavity of a concrete-filled steel tube (CFST) column to effectively enhance the axial compressive loading capacity of CFST columns and save construction resources. Axial compressive tests were conducted on 9 square SCFST stub columns and 3 square CFST stub columns. Test results show that the outward local buckling of the steel tube and the crushing of the infilled concrete and stone prism is the primary failure mode of SCFST columns. Compared with the CFST column, the axial compressive loading-carrying capacity of SCFST columns with the same steel ratio increased by 3.8 % to 29.1 %. A small-sized stone prism (β ≤ 0.14) does not significantly improve the axial compressive loading–carrying capacity of SCFST columns. Based on the test results, the finite element (FE) model of the SCFST column under axial compression is established, and the FE parameter expansion analysis is carried out. Furthermore, the confinement mechanism of the square steel tube on the infilled concrete and stone prism is further revealed based on both test and FE results of SCFST columns. Accordingly, a simplified approach to calculate the axial compressive loading–carrying capacity of square SCFST columns is proposed, and the calculation results are in better agreement with test and FE results in comparison with the results predicted according to the current design code.

通过在混凝土填充钢管（CFST）柱的空腔中插入废弃的石棱柱，提出了一种新型的石棱柱包裹混凝土填充钢管（SCFST）柱，以有效提高 CFST 柱的轴向抗压承载能力并节约建筑资源。对 9 根方形 SCFST 存根柱和 3 根方形 CFST 存根柱进行了轴向抗压试验。试验结果表明，SCFST 柱的主要破坏模式是钢管向外局部屈曲以及填充混凝土和石材棱柱的破碎。与 CFST 柱相比，相同配钢比的 SCFST 柱的轴向抗压承载能力提高了 3.8% 至 29.1%。小尺寸石棱柱（β ≤ 0.14）并不能显著提高 SCFST 柱的轴向抗压承载能力。根据试验结果，建立了 SCFST 柱轴向受压的有限元（FE）模型，并进行了 FE 参数扩展分析。此外，根据 SCFST 柱的试验和 FE 结果，进一步揭示了方形钢管对填充混凝土和石材棱柱的约束机制。据此，提出了计算 SCFST 方形柱轴向抗压承载力的简化方法，计算结果与试验和 FE 结果更加吻合，与根据现行设计规范预测的结果相比更加准确。

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引用次数: 0

Effects of supporting-substructure lateral stiffness on the internal forces of grid structures 支撑结构-下部结构侧向刚度对网格结构内力的影响

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

Journal of Constructional Steel Research

Pub Date : 2024-11-13 DOI: 10.1016/j.jcsr.2024.109155

Hao Xue , Hao Wang , Xiaogang Liu

The substructure, which supports the grid structure, significantly affects the overall stability and safety of the system by contributing lateral stiffness. This paper evaluates the safety performance of a failed grid structure and identifies a design flaw in which fixed displacement supports were improperly applied as boundary conditions. This misapplication resulted in a substantial deviation between the calculated internal forces and the actual forces observed in the structure, leading to an underestimation of the compression levels in the top chord members. A parametric analysis was performed to assess the influence of varying boundary conditions on the internal forces within the grid structure. The analysis reveals that the internal forces change logarithmically with variations in the lateral stiffness of the supports and show an approximately linear positive correlation with the span of the structure. The maximum stress in the structure decreases initially and then increases as the lateral stiffness of the supports increases. Increasing the lateral stiffness of the supports generally reduces the maximum stress in the structure; however, an optimal stiffness value may exist where the maximum stress is minimized. In cases of asymmetrical lateral stiffness, the maximum stress is primarily influenced by the section of the structure with the lowest stiffness. Thermal stresses are concentrated in regions around the supports with the higher constraint and display a clear logarithmic relationship with changes in lateral stiffness.

支撑网格结构的下部结构通过提供横向刚度，对系统的整体稳定性和安全性产生重大影响。本文对一个失效网格结构的安全性能进行了评估，发现了一个设计缺陷，即固定位移支撑作为边界条件应用不当。这一错误应用导致计算内力与结构中观察到的实际内力之间存在巨大偏差，从而导致低估了上弦杆件的压缩水平。为了评估不同边界条件对网格结构内力的影响，我们进行了参数分析。分析结果表明，内力随支撑横向刚度的变化呈对数变化，并与结构跨度呈近似线性正相关。结构中的最大应力最初会减小，然后随着支撑横向刚度的增加而增大。增加支撑的侧向刚度通常会减小结构的最大应力；然而，可能存在一个最佳刚度值，在该值上最大应力最小。在横向刚度不对称的情况下，最大应力主要受结构中刚度最小的部分影响。热应力集中在约束较高的支撑周围区域，并与横向刚度的变化呈明显的对数关系。

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引用次数: 0