一般大气环境下锈蚀RC框架梁恢复力模型  

Restoring Force Model of Corroded RC Frame Beam in General Atmospheric Environment

作　　者：尚志刚 郑淏[1,2] 郑山锁 董晋琦[1,2] 贺金川 SHANG Zhigang;ZHENG Hao;ZHENG Shansuo;DONG Jinqi;HE Jinchuan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Structural Engineering and Earthquake Resistance(XAUAT),Ministry of Education,Xi’an 710055,China;Architectural Design and Research Institute,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]结构工程与抗震教育部重点实验室(西安建筑科技大学),陕西西安710055 [3]西安建筑科技大学建筑设计研究院,陕西西安710055

出　　处：《湖南大学学报（自然科学版）》2021年第5期29-38,共10页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划项目(2019YFC1509302);国家自然科学基金资助项目(51678475);陕西省重点研发计划项目(2021ZDLSF06-10);西安市科技计划项目(2019113813CXSF016SF026)。

摘　　要：对5榀一般大气环境下锈蚀RC框架梁进行拟静力试验,分析锈蚀程度对RC框架梁滞回性能的影响.基于试验结果,结合完好RC框架梁骨架曲线特征点参数,得到锈蚀RC框架梁骨架曲线模型.引入基于能量耗散的循环退化指数β_i,提出综合考虑锈蚀RC框架梁构件基本强度退化、软化段强度退化、卸载刚度退化和再加载刚度退化的滞回规则,进而建立适用于一般大气环境下锈蚀RC框架梁的恢复力模型.将建立的恢复力模型与试验滞回曲线进行对比,吻合情况良好,表明所建立的恢复力模型具有较高的精度,能较好地揭示一般大气环境下锈蚀RC框架梁的滞回特性.研究成果可为锈蚀RC结构弹塑性分析提供理论依据.A quasi-static test was carried out on five corroded RC frame beams in general atmospheric environment to analyze the influence of corrosion degree on hysteretic behavior.Based on the test results and the characteristic point parameters of the intact RC frame beam’s skeleton curve,the skeleton curve model of corroded RC frame beams was obtained.The cyclic degradation indexβi based on hysteresis energy dissipation was introduced,and the hysteretic rules considering the basic strength degradation,post-capping strength degradation,unloading stiffness degradation and reloading stiffness degradation of corroded RC frame beams were proposed.Then,the restoring force model applied to corroded RC beams in general atmospheric environment was established.The comparison of the established restoring force model and the experimental hysteresis curves was performed.The results showed that the agreement was good,and the established restoring force model has high precision,which can better reveal the hysteretic behavior of corroded RC frame beams in general atmospheric environment.This study can provide a theoretical basis for the elasto-plastic analysis of corroded RC structures.

关 键 词：一般大气环境 RC框架梁 锈蚀 骨架曲线模型 循环退化 恢复力模型 

分 类 号：TU375[建筑科学—结构工程] TU317.1