基于损伤退化的钢筋混凝土柱参数分析及恢复力模型  

Parameter analysis and restoring force model of reinforced concrete column based on damage degradation

作　　者：张娇磊 李进[1] 李书锋 袁大伟 李青宁[1] ZHANG Jiaolei;LI Jin;LI Shufeng;YUAN Dawei;LI Qingning(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Transportation,Xuchang College,Xuchang 461000,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]许昌学院交通运输学院,河南许昌461000

出　　处：《铁道科学与工程学报》2020年第8期2083-2092,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51678474)。

摘　　要：为研究钢筋混凝土柱受相关因素对损伤的影响以及建立考虑损伤退化的钢筋混凝土柱恢复力模型,通过6根足尺钢筋混凝土柱,基于拟静力试验研究以复合普通箍筋、复合高强螺旋箍筋、结构连接形式、轴压比等为主要参数钢筋混凝土柱的损伤机理,依据修正的Park-Ang损伤模型建立拟静力损伤指标,提出循环加卸载刚度退化函数。其中,结合构件滞回曲线和损伤指标的参数分析发现:轴压比的增大会加大构件的最终损伤程度;复合螺旋箍筋较普通复合箍筋减慢其损伤的积累,但不会影响构件最终的损伤破坏程度;对于抗震性能较好的装配式柱其损伤性能与现浇柱基本一致。基于修正的损伤指标分别绘制循环加载下最大位移、位移比、循环荷载下的刚度退化、损伤指标之间的关系曲线,从而建立循环加卸载刚度退化函数,最终提出可以反映构件随着循环荷载作用下刚度退化、捏缩效应的钢筋混凝土柱恢复力模型。通过与试验对比分析表明:该宏观恢复力模型可以较为准确地刻画钢筋混凝土柱的抗震性能。同时本文建立的钢筋混凝土柱恢复力模型及其方法可为钢筋混凝土其他构件提供抗震分析理论依据。In order to study the influences of relevant factors on the damage of reinforced concrete columns and to establish the reinforced concrete column resilience model considering damage degradation,six full-scale composite reinforced concrete columns were used to study the composite ordinary stirrups and composite high strength based on the pseudo-static experiments.Spiral stirrups,structural joint form,axial compression ratio,etc.are the main parameters of the damage mechanism of reinforced concrete columns.According to the modified Park-Ang damage model,the quasi-static damage index was established,and the cyclic loading and unloading stiffness degradation function was proposed.Among them,combined with the parameter analysis of the component hysteresis curve and damage index,it was found that the increase of the axial compression ratio would increase the ultimate damage degree of the component;the composite spiral stirrup will slow down the accumulation of damage compared with the ordinary composite stirrup,but will not affect the component.The ultimate damage degree;for the assembled column with better seismic performance,the damage performance was basically the same as that of the cast-in-place column.Based on the modified damage index,the relationship curve between the maximum displacement,the displacement ratio,the stiffness degradation under cyclic loading and damage index were plotted respectively,and the cyclic loading and unloading stiffness degradation function were established.Finally,it can be proposed that the component can follow the cycle.Resilience model of reinforced concrete columns with stiffness degradation and pinch effect under load.The comparison and analysis with the experiments showed that the macroscopic resilience model could accurately describe the seismic performance of reinforced concrete columns.At the same time,the reinforced concrete column resilience model and its method can provide theoretical basis for seismic analysis of other reinforced concrete members.

关 键 词：钢筋混凝土柱 抗震性能 损伤指标 刚度退化 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程]