基于静力弹塑法方法的碳纤维加固框架结构抗震性能分析  

SEISMIC PERFORMANCE ANALYSIS OF CARBON FIBER REINFORCED FRAME STRUCTURE BASED ON PUSHOVER ANALYSIS METHOD

作　　者：倪茜[1] 张斌 李锦锦 NI Qian;ZHANG Bin;LI Jinjin(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Shaanxi Province Water Conservancy and Electric Power Survey and Design Institute,Xi'an 710001,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054 [2]陕西省水利电力勘测设计研究院,西安710001

出　　处：《工业建筑》2020年第2期104-108,112,共6页Industrial Construction

基　　金：国家自然科学基金项目(415002298);陕西省教育厅专项科研计划项目(09JK579)。

摘　　要：为研究碳纤维增强复合材料(CFRP)粘贴框架柱对混凝土框架结构抗震性能产生的影响,选取某工程对加固前后的结构分别进行水平推覆分析。依据我国《混凝土结构加固设计规范》对一个既有八层框架结构设计两种CFRP加固方案,一种是对结构局部抗震加固(方案1),另一种是整体抗震加固(方案2)。利用有限元分析软件建立普通框架结构和两种不同加固方案下的结构模型,对三者分别进行模态分析及pushover分析,从结构刚度变化和位移响应等方面进行研究,评价结构加固前后的抗震性能,研究发现:加固后结构自振频率增大,表明CFRP对结构刚度有一定增强,但前三阶主振型频率增大不足5%;相同变形时方案1结构的基底剪力较初始结构增加24. 5%,方案2的基底剪力增加30. 4%,表明结构经CFRP加固后可承受更大的变形,因此延性有较大的提高。各楼层位移和层间位移角表现出减小的趋势,方案1最大层间位移角较加固前减小了3. 8%,方案2最大层间位移角减小20%。分析表明:采用CFRP加固混凝土框架结构能有效改善结构的抗震性能,且核心表现在结构延性的提升;为了确保结构安全,应对结构进行整体抗震加固。A building was chosen to conduct pushover analysis in order to study the effect of carbon fiber reinforced polymer(CFRP) on the seismic behavior of concrete frame structures. Two CFRP reinforcement schemes were designed for an existing eight-story frame structure office building in accordance with China ’s "Code for Design of Concrete Structure Reinforcement(GB 50367-2013) . "One was local seismic reinforcement,the other was integral seismic reinforcement. The finite element analysis software is used to establish the common frame structure and the structural model under two different reinforcement schemes,and modal analysis and pushover analysis were carried out on the three models respectively. From the aspects of stiffness variation and displacement response of the structure,the seismic beharior before and after structural reinforcement was evaluated. It was found that the selfvibration frequency of the structure increased after reinforcement,which indicates that the CFRP could enhance the stiffness of the structure to some extent,but the first three main mode frequencies only increased less than 5%;Under the same deformation,the base shear force of scheme 1 increased by 24. 5% compared with the initial structure,and the base shear force of scheme 2 increased by 30. 4%,indicating that the structure can withstand greater deformation after CFRP reinforcement,so the ductihty is greatly improved. The floor displacement and story drift angle showed decreasing trends,the maximum story drift angle of the first scheme was reduced by 3. 8%,the maximum story drift angle of the second scheme was reduced by 20%. The analysis showed that CFRP could effectively improve the seismic behavior of concrete frame structure,and the core performance was the improvement of ductility of the structure;in order to ensure the safety of the structure,the structure should be reinforced integrally.

关 键 词：钢筋混凝土框架 碳纤维加固 有限元分析 静力弹塑性分析 抗震性能分析 

分 类 号：TU352.11[建筑科学—结构工程] TU375.4