核心约束空腹式型钢混凝土柱恢复力模型研究

周春恒1,2,陈宗平2,3

振动与冲击 ›› 2021, Vol. 40 ›› Issue (13) : 306-313.

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (13) : 306-313.
论文

核心约束空腹式型钢混凝土柱恢复力模型研究

  • 周春恒1,2,陈宗平2,3
作者信息 +

Restoring force model of lattice steel reinforced concrete column with core constraints

  • ZHOU Chunheng1,2, CHEN Zongping2,3
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文章历史 +

摘要

为了研究核心约束空腹式型钢混凝土(LSRCC)柱的恢复力模型,通过8个LSRCC柱试件的低周反复加载试验,获取了骨架曲线和滞回曲线,分析了其滞回特性;基于骨架曲线和滞回曲线特征,在弹塑性刚度、软化刚度和卸载刚度等模型特征参数的计算中,量化了型钢与螺旋箍筋的约束效应,建立了考虑型钢与螺旋箍筋复合约束作用的骨架曲线模型和恢复力模型。结果表明:核心约束空腹式型钢混凝土柱的滞回特性主要受轴压比、截面类型、螺旋箍筋配箍率和型钢间接配钢率的影响;所建议的三折线型骨架曲线模型与实测骨架曲线吻合较好,所建议的定点指向型恢复力模型与滞回曲线也较好的吻合,并且能反映不同轴压比和复合约束效应对滞回特性的影响,可为该结构的弹塑性地震反应分析提供参考。

Abstract

Here, to study the restoring force model of lattice steel reinforced core-confined concrete (LSRCC), low cyclic repeated loading tests were conducted on 8 specimens of LSRCC to obtain their skeleton curves and hysteretic curves. Their hysteretic characteristics were analyzed. Based on characteristics of skeleton curves and hysteretic curves, the constraint effect of section steel and spiral stirrup was quantified in calculating model characteristic parameters of elastoplastic stiffness, softening stiffness and unloading stiffness. The skeleton curve model and restoring force model of LSRCC considering composite constraint action of section steel and spiral stirrup were established. The results showed that  hysteretic characteristics of LSRCC are mainly affected by axial compression ratio, section type, stirrup ratio of spiral stirrup and indirect steel ratio of section steel; the proposed three-fold line skeleton curve model agrees better with the measured skeleton curve; the proposed fixed point orientation restoring force model also agrees better with the measured hysteretic curve, and it can reflect effects of different axial compression ratios and composite constraint effect on hysteretic characteristics; the results can provide a reference for elastic-plastic seismic response analysis of the structure.

关键词

核心约束空腹式型钢混凝土 / 复合约束 / 滞回特性 / 骨架曲线 / 恢复力模型

Key words

lattice steel reinforced core-confined concrete (LSRCC) / composite constraint / hysteretic characteristics / skeleton curve / restoring force model

引用本文

导出引用
周春恒1,2,陈宗平2,3. 核心约束空腹式型钢混凝土柱恢复力模型研究[J]. 振动与冲击, 2021, 40(13): 306-313
ZHOU Chunheng1,2, CHEN Zongping2,3. Restoring force model of lattice steel reinforced concrete column with core constraints[J]. Journal of Vibration and Shock, 2021, 40(13): 306-313

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