波形腹板部分包覆组合柱弱轴抗震试验分析
Seismic Test Analysis of Partially Encased Composite Columns with Corrugated Webs Around Minor Axis
针对平腹板部分包覆组合(partially encased composite, PEC)柱弱轴方向刚度较小、平钢板与混凝土咬合力较弱等问题,提出一种波形腹板PEC柱。为研究波形腹板PEC柱的弱轴抗震性能,设计两根不同腹板形式的组合柱试件开展弱轴方向拟静力加载试验研究,观察两类组合柱的变形发展过程和最终破坏形态,分析滞回曲线、延性系数等抗震性能指标。基于有限元模型进行参数拓展分析,探究轴压比、混凝土强度、系杆间距、钢材强度、翼缘厚度对波形腹板PEC柱抗震性能的影响。结果表明:两类组合柱均发生弯曲破坏,波形腹板PEC柱的滞回曲线更为饱满,峰值承载力、耗能能力均优于平腹板PEC柱的对应指标。有限元分析结果显示:轴压比对波形腹板PEC柱的抗震性能影响显著,随轴压比增大,试件承载力呈逐渐下降趋势,轴压比从0.2提升至0.6时,承载力下降了15.5%;设置系杆与增大翼缘厚度可明显提升试件的承载能力、延性和初始刚度。结合现有规范提出波形腹板PEC柱弱轴压弯承载力计算公式,计算理论值与试验值的相对误差在10%以内,可为今后波形腹板PEC结构的抗震设计提供参考。
To address the issues of low stiffness around minor axis and insufficient bond strength between flat steel plate and concrete in partially encased composite (PEC) columns, a novel PEC column with corrugated webs is proposed in this study. The minor axis seismic performance of PEC column with corrugated webs was investigated through quasi-static cyclic loading tests on two composite columns featuring different web configurations. The deformation development and ultimate failure modes of the composite columns were observed, while the seismic performance indices such as hysteretic curves and ductility coefficients were analyzed. Furthermore, parametric studies were conducted using finite element models to evaluate the effects of axial compression ratio, concrete strength, tie bar spacing, steel strength, and flange thickness on the seismic behavior of the proposed column. The results show that both types of composite columns exhibited flexural failure. The hysteretic curves of the PEC column with corrugated webs were full, and its peak bearing capacity and energy dissipation capacity were superior to those of the PEC column with flat webs. The finite element analysis demonstrates that the seismic performance of PEC columns with corrugated webs is significantly influenced by the axial compression ratio. As the axial compression ratio increases, there is a gradual decrease in the bearing capacity. Specifically, when the axial compression ratio increases from 0.2 to 0.6, there is a reduction in bearing capacity by 15.5%. Incorporating tie bars and increasing flange thickness can greatly enhance the bearing capacity, ductility and initial stiffness of the column. Finally, a calculation formula for predicting the compressive-bending capacity of PEC columns with corrugated webs around minor axis is proposed based on existing codes. The relative errors between the calculated theoretical values and the test results are less than 10%, which can provide a reference for the future seismic design of PEC structures with corrugated webs.
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国家自然科学基金(52278214)
国家自然科学基金(52378314)
陕西省自然科学基础研究计划重点项目(2022JZ -21)
西部装配式建筑工业化协同创新中心科学研究计划项目(N202203)
土木工程防灾减灾全国重点实验室开放基金项目(SLDRCE23-06)
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