方钢管再生混凝土叠合柱轴压性能有限元非线性分析

摘要/Abstract

摘要： 为研究方钢管再生混凝土叠合柱的轴压性能与非线性力学性能,在叠合柱轴压性能试验研究基础上,利用ABAQUS软件建立了叠合柱精细化模型,对其轴压性能进行非线性数值模型分析研究。并在此基础上进一步扩展分析了再生混凝土强度等级、拉结筋间距、箍筋间距、方钢管壁厚及长细比对叠合柱轴压性能的影响,获得了叠合柱的应力应变云图以及荷载-位移曲线。结果表明:试验结果与数值模拟结果基本吻合,验证了叠合柱有限元模型的合理性;加载结束,叠合柱中部呈鼓曲破坏,表现为再生混凝土保护层压碎脱落,钢筋和钢管局部鼓曲,核心再生混凝土压碎等;随着再生混凝土强度等级增加,叠合柱承载力和耗能均逐渐提高;设置拉结筋可显著提高叠合柱承载力和耗能能力,但延性仅有小幅度提高;增大箍筋间距和长细比,叠合柱承载力、延性和耗能均降低;随着方钢管壁厚增加,叠合柱承载力、变形性和耗能能力均显著增强。

关键词: 方钢管, 再生混凝土, 叠合柱, 轴压性能, 非线性分析

Abstract: To study axial compression performance and nonlinear mechanical performance of recycled concrete composite columns with square steel tubes, based on the axial compression performance test of recycled concrete composite columns with square steel tubes, a refined model of composite columns was established by using nonlinear finite element software ABAQUS, and its axial compression performance was analyzed by nonlinear numerical model. On this basis, the effect of recycled aggregate concrete strength grade, tie bar spacing, stirrup spacing, square steel tube wall thickness and slenderness ratio on axial compression performance of composite columns were further expanded and analyzed. The stress strain nephogram and load-displacement curves of composite columns were obtained. The results show that the experimental results are basically consistent with numerical simulation results, which also verifies the rationality of finite element model of composite columns. At the end of loading, the middle part of composite columns is damaged by bulging, which shows that the protective layer of recycled concrete is crushed and falls off, the steel bars and steel tubes are locally bulging, and the core recycled concrete is crushed. With the increase of strength grade of recycled concrete, the bearing capacity and energy dissipation of composite columns gradually increase. Setting tie bars can significantly improve the bearing capacity and energy dissipation of composite columns, but the ductility is only slightly improved. The bearing capacity, ductility and energy dissipation of composite columns decrease with the increase of stirrup spacing and slenderness ratio. With the increase of the wall thickness of square steel tubes, the bearing capacity, deformability and energy dissipation capacity of composite columns are significantly enhanced.

Key words: square steel tube, recycled concrete, composite column, axial compression performance, nonlinear analysis

中图分类号:

TU528

高锦龙, 李明, 周奇, 牛海成, 赵鹏鹏, 何欢欢. 方钢管再生混凝土叠合柱轴压性能有限元非线性分析[J]. 硅酸盐通报, 2023, 42(12): 4271-4282.

GAO Jinlong, LI Ming, ZHOU Qi, NIU Haicheng, ZHAO Pengpeng, HE Huanhuan. Finite Element Nonlinear Analysis of Axial Compression Performance of Recycled Concrete Composite Columns with Square Steel Tubes[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4271-4282.

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