双向加载下钢筋混凝土框架柱震损分级及损伤模型对比分析  

Seismic damage classification of reinforced concrete frame columns under bidirectional earthquake loadings and comparative analysis of damage models

作　　者：刘昊东 张亮泉[1] 李明[1] 张昊宇[2] Liu Hao-dong;Zhang Liang-quan;Li Ming;Zhang Hao-yu(School of Civil Engineering,Northeast Forestry University,Harbin 150040,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《工程抗震与加固改造》2024年第2期105-113,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金青年基金(51108433);中国地震局工程力学研究所基本科研业务费(2019B12)。

摘　　要：目前已有的RC框架柱震损划分原则及对应损伤指标计算方法主要基于水平单向受力下的研究成果。相比单向受力,相同加载位移下水平双向受力RC框架柱的抗震性能明显退化,损伤加剧,因此RC框架柱的震损分级量化需考虑双向地震作用。本文基于已开展的RC柱双向滞回试验,提出了双向受力下RC柱基于骨架曲线的震损分级原则;基于8个典型双向损伤模型,对7个双向受力RC试验柱不同损伤级别对应的损伤指数进行了对比分析,推荐了适用于双向地震作用下RC柱震损分级判定的2个损伤模型以及对应的震损分级指数区间建议值,并对2个模型的特点和适用性进行了讨论。之后采用该损伤模型和震损分级评价指标对典型双向受力柱的抗震性能影响因素进行了分析。结果显示,损伤评价结果与试验结果和试验现象吻合较好,该方法可较好地适用于双向滞回加载RC柱的损伤评估。At present,existing RC frame column damage assessment standard and damage calculation are mainly based on research results under unidirectional horizontal earthquake loading.The seismic performance of the RC columns under the biaxial earthquake loadings has detrimental effect and exhibit more severe damage compared with that of uniaxial loaded columns.Therefore,damage classifications of RC frame columns should consider biaxial loading.This paper presents the damage assessment standard based on the skeleton curves for the previous test results of the RC columns under biaxial seismic loadings.Based on eight typical bidirectional damage models,the damage indices corresponding to different damage levels of seven RC experimental columns loaded in bidirectional were compared and analyzed.Two damage models and the interval values of corresponding damage classifications indices,which are applicable with the RC columns under biaxial seismic loading,are presented.In addition,the characteristics and applicability of the two damage models are discussed.After that,the proposed two damage models and damage classifications assessment standard were used to analyze the influencing factors of seismic performance of the RC columns under the biaxial loadings.The analysis results show that the damage assessment results are in accordance with the experimental phenomenon well.The proposed two damage models can be well applied to damage assessment of RC columns under bi-directional hysteretic loading.

关 键 词：RC框架柱 双向地震作用 损伤指数 震损分级 

分 类 号：TU375.3[建筑科学—结构工程]