CFRP加固钢筋混凝土方柱抗震性能尺寸效应的细观分析  

MESO-SCALE ANALYSIS OF SIZE EFFECT ON ASEISMIC BEHAVIOR OF REINFORCED CONCRETE SQUARE COLUMNS STRENGTHENED WITH CFRP

作　　者：金浏[1] 李秀荣[1] 杜修力[1] JIN Liu;LI Xiu-rong;DU Xiu-li(Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市减灾与防灾防护教育部重点实验室,北京100124

出　　处：《工程力学》2021年第7期41-51,共11页Engineering Mechanics

基　　金：国家重点研发计划项目(2018YFC1504302);国家自然科学基金项目(51822801,51421005)。

摘　　要：为研究CFRP加固钢筋混凝土方柱在地震作用下的破坏模式,该文考虑混凝土材料的非均质性、钢筋-混凝土间的粘结滑移作用,建立了CFRP加固钢筋混凝土方柱三维细观数值模型。在验证数值模型与试验结果吻合良好的基础上,扩展工况探讨了轴压比、CFRP体积配置率对CFRP加固钢筋混凝土方柱抗震性能及名义抗剪强度尺寸效应的影响。结果表明:一定轴压比范围内柱的承载力随轴压比增大而提高,但其延性会降低;该文工况中,CFRP加固钢筋混凝土柱的名义抗剪强度随试件尺寸增大呈降低趋势,存在着明显尺寸效应行为;在经典材料层次尺寸效应律基础上,提出了CFRP加固混凝土方柱名义抗剪强度尺寸效应理论公式(适用范围轴压比小于0.4),模拟结果证实了公式的合理性。In order to study the failure mechanism of RC columns strengthened by CFRP subjected to axial and cyclic lateral loads,a three-dimensional meso numerical model of reinforced concrete square columns strengthened with CFRP is established,considering the heterogeneity of concrete materials and the bond slip between reinforcement and concrete.On the grounds of the good agreement between the meso-scale simulation results with the available experimental results,the section size of the specimens is enlarged.Furthermore,the effects of axial compression ratio,volume allocation rate of CFRP on the aseismic performance and size effect on shear strength of reinforced concrete short columns strengthened with CFRP are explored.The results show that:the bearing capacity of specimens increases as the increase of axial compression ratio,but the ductility decreases;increasing the volume allocation ratio of CFRP has a limited effect on the increase of bearing capacity,which will enhance the ductility of columns;with the increase of specimen size,the nominal shear strength of columns tends to decrease,and there exists size effect behavior.

关 键 词：CFRP加固混凝土方柱 抗震性能 轴压比 体积配置率 尺寸效应 

分 类 号：TU528[建筑科学—建筑技术科学]