环状脱空钢管混凝土柱抗震性能及承载力计算方法研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (22) : 232-242.

论文

环状脱空钢管混凝土柱抗震性能及承载力计算方法研究

李悦1，宁哲*1,2，李志鹏3，晏勇1，黄帅4

作者信息 +

Seismic behavior and design approach of concrete filled steel tubes with circumferential gap

LI Yue1,NING Zhe*1,2,LI Zhipeng3,YAN Yong1,HUANG Shuai4

Author information +

文章历史 +

摘要

为了获得环状脱空缺陷对钢管混凝土结构抗震性能的影响规律，对钢管混凝土柱进行了低周往复荷载试验以探究环状脱空缺陷、钢管壁厚、内置栓钉和截面类型对构件破坏模式、滞回性能、极限水平承载力、转角延性系数、刚度和强度退化、耗能能力的影响。并基于有限元分析，获得了栓钉布置方式、脱空率及轴压比对环状脱空缺陷钢管混凝土柱的作用机理和影响规律。结果表明，环状脱空缺陷显著降低了钢管对核心混凝土的约束效果，减弱了二者间协同工作能力，使核心混凝土出现集中损伤而过早破坏，试件的极限水平承载力最大下降了6.50%，转角延性系数降低了22.83%。而内置栓钉能够改善钢管的约束效应，显著提高了构件的延性性能，构件的转角延性系数最大提升了49.45%。较厚的钢管壁可以缓解脱空缺陷对构件抗震性能的不利影响，提高脱空缺陷构件的承载力和耗能能力。相较圆形截面构件，脱空缺陷会导致矩形截面构件较早破坏，降低其延性性能。最后，提出并验证了环状脱空缺陷钢管混凝土柱极限水平承载能力计算方法。研究结果可为钢管混凝土结构的安全评估提供参考。

Abstract

To study the effect of circumferential gaps on the seismic performance of concrete-filled steel tube (CFST) structures, low-cycle loading test was conducted on concrete-filled steel tube columns to explore the effects of circumferential gaps, steel tube thickness, built-in studs, and section types on the influence of failure modes, hysteretic performance, ultimate horizontal bearing capacity, rotation ductility factor, stiffness and strength degradation, and energy dissipation capacity. Based on finite element analysis, the mechanism and influence of stud arrangement, gap rate and axial compression ratio on concrete-filled steel tube columns with circumferential gaps were obtained. The results show that the circumferential gap significantly reduces the constraint effect of the steel tube on the core concrete, weakens the cooperative work ability of the two, causes concentrated damage to the core concrete and makes it failure prematurely. Then the ultimate horizontal bearing capacity of the specimen decreased by 6.50%, and the rotation ductility factor decreased by 22.83%. The built-in studs can improve the constraint effect of the steel tube and significantly improve the ductility performance of the specimen. The rotation ductility factor of the specimen is increased by up to 49.45%. Thicker steel tube can alleviate the adverse effects of gaps on the seismic performance of specimens and improve the bearing capacity and energy dissipation capacity of specimens with circumferential gaps. Compared with circular cross-section specimens, circumferential gaps will cause rectangular cross-section specimen to fail earlier and reduce their ductility performance. Finally, a calculation method for the ultimate horizontal bearing capacity of concrete-filled steel tube columns with circumferential gaps was proposed and verified. The research results can provide a reference for the safety assessment of concrete-filled steel tube structures.

导出引用

李悦1, 宁哲1, 2, 李志鹏3, 晏勇1, 黄帅4. 环状脱空钢管混凝土柱抗震性能及承载力计算方法研究[J]. 振动与冲击, 2024, 43(22): 232-242

LI Yue1, NING Zhe1, 2, LI Zhipeng3, YAN Yong1, HUANG Shuai4. Seismic behavior and design approach of concrete filled steel tubes with circumferential gap[J]. Journal of Vibration and Shock, 2024, 43(22): 232-242

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