FRP加固框架的抗震性能分析  

Analysis on Seismic Performance of FRP-strengthened RC Frames

作　　者：江卫国[1] 陈忠范[2] 程文瀼[2] 

机构地区：[1]合肥学院建筑工程系,安徽合肥230022 [2]东南大学土木工程学院,江苏南京210096

出　　处：《工程抗震与加固改造》2009年第1期91-96,69,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：安徽省高等学校省级自然科学研究项目(KJ2008B258);合肥学院引进人才启动基金项目(RC032)资助

摘　　要：经FRP加固后,梁或柱截面的抗弯承载能力和塑性转动能力提高,为了研究这些因素对加固框架动力性能的影响,用Satwe设计了7层混凝土框架房屋,取其中一榀框架为算例。框架的加固方案是用CFRP布加固节点和柱脚部位的梁、柱段。采用非线性静力推覆程序和弹塑性反应谱模型进行简化动力分析,分析结果与Satwe软件的结果符合较好。然后,比较分析了框架加固前后的抗震性能。框架加固后,受到的地震作用增大,水平侧移也增大,但抵御大震和抗倒塌的能力也提高了。Tests had demonstrated the load and the plastic rotation capacity of RC beams and columns are enhanced by strengthening with FRP materials. The objective of this paper is to investigate the seismic performance of RC frames strengthened with CFRP sheets at the ends of beams and columns. A 7-story moment resisting frames of strong column-weak beam system is designed by Satwe engineering design soft, of which a plane frame is used as analysis object. An elastic-plastic speetrum model is selected, and a nonlinear static analysis progt＇am which eould be used for FRP-strengthened frames is developed to perform a pushover analysis. Simplified dynamic analyses on the dynamic and seismic performance of the non-strengthened frame are carried out and the analysis results indicated that the applied approach is feasible. Subsequently, analysis on the strengthened frame is finished, and the seismic performance of the strengthened frame, including period, mode, target displacement and corresponding floor displaeement, ere, is compared with the non-strengthened frame. While the seismie aetion and the lateral displacement of the strengthened frame became larger, the capacity of resisting great earthquake and collapse is enhanced.

关 键 词：纤维 加固 混凝土框架 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU312