震损钢筋混凝土柱剩余能力的数值模型  

NUMERICAL MODEL FOR THE RESIDUAL SEISMIC CAPACITY OF SEISMICALLY DAMAGED REINFORCED CONCRETE COLUMNS

作　　者：李磊[1,2] 罗光喜 王卓涵 郑山锁 LI Lei;LUO Guang-xi;WANG Zhuo-han;ZHENG Shan-suo(College of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratry of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi'an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《工程力学》2020年第12期52-67,共16页Engineering Mechanics

基　　金：国家科技支撑计划项目(2013BAJ08B03);陕西省自然科学基础研究计划项目(2016KJXX-93)。

摘　　要：基于PEER数据库中公开的钢筋混凝土(RC)框架柱试验资料和已有地震损伤指数模型,总结了RC框架柱在产生不同损伤等级时对应的破坏特征,提出了相应的损伤等级评定标准。研究了RC框架柱在地震损伤过程中混凝土和钢筋的损伤演化规律,分别建立了震损RC框架柱损伤区不同位置处混凝土和钢筋的损伤演化方程,提出了考虑震损RC框架柱初始损伤的混凝土模型和钢筋模型。基于OpenSEES平台和纤维模型,建立了一种直接基于材料本构关系的震损RC框架柱的数值模型,该模型考虑了损伤区不同位置处截面材料的损伤差异以及同一截面不同位置处材料的损伤差异。任意选取已有的13根RC框架柱试验资料对震损RC框架柱的数值模型计算结果进行校验。结果表明该文模型能够较为准确的预测震损RC框架柱的剩余抗震能力。研究结果为震后RC结构的性能评估和加固决策提供分析模型。Based on the reinforced concrete(RC) column test data in the Pacific Earthquake Engineering Research Center(PEER) database and the existing seismic damage index models, the damage characteristics of the RC columns at different damage levels were summarized. Damage evaluation criteria for damaged columns were proposed. The evolutionary damage to the sectional materials, including the cover concrete, confined concrete and longitudinal reinforcement, during the earthquake damage process was investigated. Evolutionary damage models for the sectional materials were proposed, where the uneven damage to the materials at different positions of the plastic hinge zone of the RC column was considered. Based on the OpenSees platform and the fiber model, a numerical model of the seismic damaged RC frame columns was established, which was directly based on the constitutive relationship of materials. The model considered the damage difference of materials in different positions of the damage area and the damage difference of materials in different positions of the same section. The test data of 13 existing RC frame columns were randomly selected to verify the numerical model calculation results of seismic damaged RC frame columns. The results show that the model accurately predicted the post-earthquake behavior of the RC columns. These results provide an analytical model for the performance evaluation of and retrofitting decisions for RC structures after an earthquake.

关 键 词：震损 钢筋混凝土 损伤演化 纤维模型 剩余能力 

分 类 号：TU352.11[建筑科学—结构工程]