摘要
为研究古尔班通古特沙漠砂混凝土框架节点的抗震性能,对9个缩尺比为1/2的框架节点进行了拟静力试验研究,研究了沙漠砂替代率、轴压比和配箍率对节点破坏模式、耗能能力、延性、刚度和恢复力模型的影响。研究结果表明:沙漠砂替代率由0%逐渐增加到80%时,试件的破坏现象、骨架曲线、耗能、刚度退化主要受沙漠砂混凝土的强度和应力-应变关系影响,延性逐渐降低,且沙漠砂替代率为80%的构件其延性较首个试件降低了11.48%;轴压比由0.2逐渐增加到0.6时,峰值荷载提高约3%,延性降低约5%,等效黏滞阻尼系数增加约18%,刚度退化程度增加;配箍率由0.50%逐渐增加到2.52%时,峰值荷载提高近10%,延性提高约6%,等效黏滞阻尼系数增加约25%,刚度退化减缓。整体而言,沙漠砂混凝土框架节点的抗震性能与普通混凝土试件相似。建立了沙漠砂混凝土框架节点的三折线恢复力模型,且计算模型与试验结果吻合良好。
To reveal the seismic behavior of Gurbantonggut desert sand concrete frame joints(DSCJ),quasi-static tests are carried out on nine 1/2-scale DSCJs.The failure phenomenon and mode,hysteresis performance,energy dissipation capacity,ductility,stiffness and restoring force models of DSCJ are investigated considering the desert sand replacement ratio,axial compression ratio,and stirrup ratio.Test results show that when the desert sand replacement ratio increases from 0%,20%,40%,60%and 80%,the failure phenomenon,skeleton curve,energy consumption and stiffness degradation of the specimens are mainly determined by the strength and stress-strain constitutive relationship of desert sand concrete,and the ductility decreases gradually,which decreases by 11.48%with the of 80%.When the axial compression ratio increases from 0.2,0.4 and 0.6,the peak load increases by about 3%,the ductility decreases by about 5%,the equivalent viscous damping coefficient increases by about 18%,and the stiffness degradation increases gradually.When the stirrup ratio increases from 0.50%,1.57%and 2.52%,the peak load increases by about 10%,the ductility increases by about 6%,the equivalent viscous damping coefficient increases by about 25%,and the stiffness degradation decreases gradually.In summary,the seismic performance of DSCJ is similar to that of ordinary concrete specimens,showing better energy dissipation capacity.The three-fold line restoring force model of DSCJ is established,and the calculated model agrees well with the experimental results.This study could provide a basis for the engineering application of DSCJ.
作者
李志强
张华东
甘丹
LI Zhi-qiang;ZHANG Hua-dong;GAN Dan(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi 832003,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2023年第3期757-766,共10页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52268034,51668053)
兵团科技创新人才计划项目(2021CB043)。
关键词
抗震性能
沙漠砂混凝土
拟静力试验
框架节点
恢复力模型
seismic performance
desert sand concrete
quasi‑static test
frame joints
restoring force model
