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纤维增强水泥基材料增强局部破损框架节点的抗震性能研究
作者：王金玉琳，张品乐，胡静
（昆明理工大学 建筑工程学院，云南 昆明 650500）
摘要：地震作用下钢筋混凝土框架梁-柱节点受到轴力、弯矩和剪力的共同作用，节点核心区受力比较复杂且震害突出，对节点核心区进行局部补强是提高结构抗震性能的主要手段。研究采用ABAQUS软件中的塑性损伤模型建立了框架节点拟静力加载试验，并与试验结果比对验证了数值模拟的可靠性，进而采用纤维增强水泥基复合材料（ECC）加固框架节点核心破损区并开展数值模拟。研究结果表明：ECC材料能有效改善破损框架节点的抗震性能，在0.90~1.00和0.75~1.00的损伤区域内进行加固，其结构正向极限承载力分别提高了16.9%和33.2%，负向极限承载力分别提高了29.3%和36.4%。
关键字：ECC材料；框架节点；局部加固；抗震性能；数值模拟
中图分类号：TU528.58 文献标识码：A 文章编号：1001-702X（2022）12-0017-05
Study on seismic behavior of ECC reinforced partially damaged region of the frame joints
WANG Jinyulin，ZHANG Pinle，HU Jing
（Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology，Kunming 650500）
Abstract：The reinforced concrete beam-columns frame was subjected to the combined action of axial forces，bending moments and shear forces under earthquake conditions. The stress status of the joint core region of the frame was complex and was in seriously damage level. The local reinforcement of the joint core region is the main means to improve the seismic performance of the structure. The plastic damage model in ABAQUS software is used to establish the quasi-static loading test of frame joints，and the reliability of numerical simulation is verified by comparing with the test results. Then，fiber reinforced cementitious composite（ECC） is used to strengthen the core damaged region of frame joints and carry out numerical simulation. The research results show that ECC material can effectively enhance the seismic performance of damaged frame joints，and reinforcement in the damage area of 0.90~1.00 and 0.75~1.00 can increase the positive ultimate bearing capacity of the structure by 16.9% and 33.2%，respectively，and the negative direction by 29.3% and 36.4%，respectivel
Key words：ECC，frame joint，local reinforced method，seismic performance，numerical simulation