摘要
为研究低周反复荷载作用下方钢管再生混凝土柱的恢复力模型,以再生粗骨料取代率和轴压比为变化参数,设计并制作了6个试件,进行拟静力试验。观察试件的破坏形态,实测试件的滞回曲线,综合采用定点指向、位移幅值承载力突降、模型软化点等特殊处理方法,建立以相对屈服点、相对峰值点和相对破坏点为特征点并结合滞回曲线和卸载刚度的三折线荷载—位移恢复力模型。结果表明:试件破坏形态与普通钢管混凝土柱相似,方钢管底部鼓曲破坏,再生混凝土底部被压碎。试件的滞回曲线比较饱满,且稳定性良好。建立的低周反复荷载作用下方钢管再生混凝土构件的三折线恢复力模型与实测滞回曲线吻合较好,建议用于该类新型组合结构的弹塑性地震反应分析。
To study restoring force model of recycled aggregate concrete filled square steel tube column under low cycle reversed loading. The guasi-static test for six recycled aggregate concrete filled square steel tube column specimens with different replacement ratios of recycled coarse ag- gregate and axial compression ratios were carried out quasi-static test. The failure mode was oh- served, the hysteretic curves were measured. By using special method including fixed point, dropped bearing capacity of displacement amplitude and model softening point, load versus dis- placement restoring force model of three line was established including hysteretic curves, unloa- ding rigidity and characteristic points such as relative yield point, relative peak point and relative failure point. It is shown that the failure modes of specimens are similar to ones of concrete filled square steel tube columns, the square steel tube is buckled at the bottom and the recycled aggre- gate concrete is crushed at the bottom; The hysteretic curves are plump and stable; The estab- lished restoring force model of three-line for recycled aggregate concrete filled square steel tube specimens under low cycle reversed loading agrees well with the measured hysteretic curves. So it is that suggested such model can be applied to the elastic-plastic seismic response analysis of so new type of composite structure.
出处
《防灾减灾工程学报》
CSCD
北大核心
2016年第5期744-750,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
河南省科技攻关项目(2017)
2016年安全生产重大事故防治关键技术科技项目(henan-0006-2016AQ)
河南省高等学校重点科研项目(15A560008)
焦作市科技计划项目(2015)资助
关键词
方钢管再生混凝土柱
恢复力模型
拟静力试验
定点指向
位移幅值承载力突降
模型软化点
recycled aggregate concrete filled square steel tube column
restoring force model
quasi-static test
fixed point
dropped bearing capacity of displacement arnplitude
model softening point
