钢筋混凝土框架柱延性破坏准则研究  

RESEARCH ON DUCTILITY FAILURE CRITERION OF REINFORCED CONCRETE FRAME COLUMNS

作　　者：付国[1] 何斌[1] 刘伯权[2] FU Guo;HE Bin;LIU Bo-quan(College of Water Resource and Architectural Engineering,Northwest A&F University,Yangling 712100,China;School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,杨凌712100 [2]长安大学建筑工程学院,西安710061

出　　处：《工程力学》2021年第11期122-133,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(52008339);陕西省自然科学基础研究计划项目(2017JQ5113)。

摘　　要：现有框架柱破坏准则多为构件塑形变形程度的定性描述,未考虑变形能力强弱对构件性能退化和破坏的影响。该文研究钢筋混凝土框架柱延性大小、轴压比、配箍率等参数与抗震性能退化之间的量化关系,提出了一种改进的延性破坏准则,采用统计分析方法并借鉴阿伦尼乌斯公式提出了破坏指数计算式。结果表明,提出的延性准则较好地实现了柱破坏的量化表征,105个低周反复加载试件和9个单调加载试件在4种情况下破坏指数平均值均接近1.0,标准差在0.2~0.4,考虑配箍率和承载力退化后的破坏指数可更好地定义构件破坏。综合29根框架柱的试验现象、破坏特点和破坏指数统计结果,给出了延性准则对应的破坏标准,研究成果可为混凝土柱抗震性能评估提供参考。Current failure criterions are mainly focused on qualitatively charcterizing the plastic deformation degree of structural members,without considering the influence of deformation ability on the degradation of performance and damage of the members.A ductile failure criterion was established on the grounds of the investigation of the correlations between ductility,axial compression ratio,stirrup ratio and structural failure of reinforced concrete(RC)frame columns.The calculation formula for the concerened damage index was proposed using the combination of statistical methods and of the Arrenius formula.According to 105 sets of low-cycle repetitive loading members and to 9 sets of monotonic loading members,under 4 different conditions,it can be drawn that the calculated damage indexes were all about 1.0 with standard deviations between 0.2 and 0.4.The above results indicate that the proposed ductile criterion can well quantitatively characterize the ductile damage of RC columns.Moreover,in the case of considering stirrup ratio and degradation of bearing capacity of RC columns,the calculated damage index also can well reflect the damge of the members.The damage evaluating standards of ductility criterion for RC columns were proposed based on the comprehensive consideration of the experimental phenomena,of damage characteristics and of the calculated damage index of 29 columns.The work can provide a reference for the damage evaluation of RC columns.

关 键 词：钢筋混凝土柱 变形能力 延性准则 破坏标准 阿伦尼乌斯公式 

分 类 号：TU375.3[建筑科学—结构工程]