加固后钢筋混凝土十字形柱斜向抗震性能研究  

Research on the oblique seismic behavior of reinforced concrete cross-shaped columns after reinforcement

作　　者：刘春阳[1] 王乐超 LIU Chunyang;WANG Lechao(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《山东建筑大学学报》2024年第2期16-26,共11页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(52278507);山东省自然科学基金项目(ZR2022ME160,ZR2018MEE044)。

摘　　要：钢筋混凝土十字形柱的斜向抗震性能是影响结构安全性能的重要因素。文章设计了3种新型约束补强方式加固的钢筋混凝土十字形柱试件,在验证有限元建模方法有效性的基础上模拟了斜向低周往复加载,通过分析试件的滞回曲线、骨架曲线、承载力和延性等抗震性能指标研究了试件的斜向抗震性能,并参考相关规范得出了新型约束补强方式十字形柱的压弯承载力计算公式。结果表明:钢筋网格局部加强使试件的斜向峰值位移提高了7.4%~19.4%;柱端嵌贴碳纤维布(Carbon Fiber Reinforced Polymer,CFRP)板条会使试件峰值承载力、延性系数分别提高了约29.2%~34.2%和7.5%~22.9%;柱端嵌贴CFRP板使试件斜向峰值承载力、延性系数分别提高了约99.9%~105.5%和17.4%~24.8%。3种加固方式均可改善钢筋混凝土十字形柱的斜向抗震性能,改善程度由大到小依次为柱端嵌贴CFRP板、柱端嵌贴CFRP板条和钢筋网格局部加强。The oblique seismic performance of reinforced cross-shaped columns is a crucial factor affecting the safety performance of structures.In this paper,three kinds of reinforced concrete cross-shaped columns strengthened by new restraint strengthening methods are designed.On the basis of verifying the effectiveness of the finite element modeling method,the oblique low-cycle cyclic loading simulation is conducted.By analyzing the seismic performance indexes of the specimens such as hysteretic curve,skeleton curve,bearing capacity and ductility,the oblique seismic performance of the specimens is studied,and the formula for calculating the compression-bending capacity of the new restraint strengthening method cross-shaped columns is obtained by referring to the code.The results indicate that the local reinforcement increases the peak deflection of specimens by 7.4%~19.4%.The peak bearing capacity is increased by 29.2%~34.2%and ductility coefficient is increased by 7.5%~22.9%when CFRP strips are inserted at column ends.The peak bearing capacity and ductility coefficient are increased by 99.9%~105.5%and 17.4%~24.8%respectively.The three strengthening methods can enhance the oblique seismic performance of reinforced concrete cruciform columns,and the improvement degree from large to small is embedded CFRP plates at the column ends,embedded CFRP strips at the column ends,and local reinforcement of reinforcement grids.

关 键 词：钢筋混凝土十字形柱 钢筋网格局部加强型 柱端嵌贴CFRP板条 柱端嵌贴CFRP板 斜向抗震性能 

分 类 号：TU375.3[建筑科学—结构工程]