高强混凝土多重复合芯柱恢复力模型研究  

Study on Restoring Force Model of High-strength Concrete Columns Reinforced with Multiple Composite Central Reinforcements

作　　者：邢国华[1] 王浩楠 王溢菲 马军 国巍[2] Xing Guohua;Wang Haonan;Wang Yifei;Ma Jun;Guo Wei(School of Civil Engineering,Chang’an University,Xi’an 710061,China;School of Civil Engineering,Central South University,Changsha 410083,China)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]中南大学土木工程学院,长沙410083

出　　处：《震灾防御技术》2021年第2期326-338,共13页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(51868073);陕西省技术创新引导专项基金(2019CGHJ-06);中央高校科研业务费专项经费项目(300102288302)。

摘　　要：基于8根高强混凝土多重复合芯柱在低周往复荷载作用下的试验结果,考虑轴压比、箍筋间距、配箍率等因素,提出骨架曲线特征点理论计算模型。同时,考虑加载历程对芯柱性能退化的影响,根据试验拟合结果引入刚度退化模型,以反映各试件滞回曲线卸载刚度退化规律,给出恢复力模型滞回规则,并将滞回曲线模拟值与试验值进行对比。结果表明:骨架曲线特征点计算方法具有较高精度,计算骨架曲线与试验测量骨架曲线吻合良好,可为高强混凝土多重复合芯柱非线性地震反应分析和工程设计提供参考。Based on the quasi-static cyclic tests of eight high-strength concrete columns reinforced with multiple composite central reinforcements,a theoretical calculation model was presented to predict the characteristic points of skeleton curves for the columns considering influencing factors such as the axial compression ratio,stirrup spacing,and stirrup ratio.In addition,a restoring force model was introduced considering the degradation of unloading stiffness based on the fitted results of cyclic loading test data.The results show that the proposed model can accurately predict the characteristic points for these columns.The simulated hysteretic behaviors based on the restoring force model had good agreement with those from experimental results.Therefore,the proposed restoring force model can be applied for the nonlinear dynamic analysis of structures with such kinds of multiple reinforcement high-concrete columns.

关 键 词：芯柱 配箍形式 骨架曲线 抗震性能 恢复力模型 

分 类 号：TU398.9[建筑科学—结构工程]