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进行了4个1/2比例SRC柱-RC梁组合件的低周反复加载试验,研究不同强节点系数的SRC柱-RC梁节点在各受力阶段的抗震性能、变形组成和合理的节点构造形式。试验结果表明,试件的破坏形态和变形组成与强节点系数有关,所采用的节点连接构造合理。基于试验数据和局部-整体变形关系,探讨了各受力阶段SRC柱-RC梁组合件的弯曲变形、节点核心区剪切变形、纵向钢筋在节点区的滑移变形等组成部分在组合件整体变形中所占比例及其变化规律。分析结果表明,梁变形所产生的侧移在强柱弱梁型SRC柱-RC梁组合件总侧移中所占比例最大,核心区剪切变形所占比例随强节点系数的减小而增大。通过对各受力阶段破坏特征描述和相应特征参数试验结果的分析,提出了强柱弱梁型SRC柱-RC梁框架结构满足运行、基本运行、可修和避免倒塌等四个抗震性能水平的位移角限值分别为1/500、1/150、1/75和1/30。研究成果可供SRC柱-RC梁组合结构地震反应分析和工程应用参考。
The low-cycle repeated loading tests of four 1/2 SRC column-RC beam assemblies were carried out to study the anti-seismic performance, deformation composition and reasonable node structure of SRC-RC beam nodes with different strong node coefficients form. The experimental results show that the failure morphology and deformation components of the specimen are related to the strong nodal coefficients, and the joint connections adopted are reasonable. Based on the experimental data and the local-global deformation relationship, the bending deformation of the SRC-RC beam assembly under various stress phases, the shear deformation of the core region of the node and the sliding deformation of the longitudinal reinforcement in the node region are discussed. The proportion of deformation and its variation. The analysis results show that the lateral displacement caused by beam deformation is the largest in the total lateral displacement of strong column and weak beam SRC column-RC beam assembly. The proportion of shear deformation in core area increases with the decrease of strong node coefficient Big. Through the analysis of the destructive characteristics and the test results of the corresponding characteristic parameters under various stress stages, the seismic performance of the SRC column -RC beam frame with four column structures, which meet the requirements of operation, basic operation, repairable and avoidance collapse, is proposed Displacement limits are 1/500, 1/150, 1/75 and 1/30, respectively. The research results are available for seismic response analysis and engineering application of SRC column-RC beam composite structures.