附加腹板的混凝土框架结构抗震加固研究  

Seismic strengthening of RC frame structure with web-type plate

作　　者：岳庆霞 于一浦 李书蓉 张鑫[1,2] 王妍 YUE Qingxia;YU Yipu;LI Shurong;ZHANG Xin;WANG Yan(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China;Shandong Jiangu Special Professional Engineering Co.,Ltd.,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 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]山东建固特种专业工程有限公司,山东济南250101

出　　处：《振动工程学报》2025年第4期827-837,共11页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52038006,52208486);2019年度山东省高等学校青创人才引育计划项目。

摘　　要：针对目前框架结构整体抗震性能提升时节点加固困难等问题,提出了一种附加腹板的框架结构抗震加固方法,通过布置腹板,使梁上出现多个弯矩峰值点,从而优化内力分布,减小框架梁、柱节点内力,形成具有多道抗震防线的框架结构。以10层框架结构为研究对象,分析腹板布置位置和刚度对结构内力的影响规律,研究了腹板配筋对结构抗震性能的影响,提出腹板配筋系数以表征腹板与框架梁配筋比值关系。结果表明,附加腹板后结构刚度提高,框架梁、柱节点内力减小。当腹板布置在梁跨的0.3l和0.7l处,腹板与框架柱和框架梁的线刚度比在0.7~1.5和3.5~7之间时,内力调节作用较好。通过非线性损伤分析,给出了腹板配筋系数设计建议值,从而实现预设的腹板先屈服的破坏机制。以某实际工程为算例,对原结构和附加腹板加固结构进行了非线性动力时程分析。结果表明,附加腹板后结构总体侧移和层间位移角减小,出铰率小于原结构,附加腹板后的框架结构抗震性能提高,说明所提附加腹板的设计方法合理可行。To improve the whole seismic performance of the frame structure,especially the beam-column joint,a new seismic reinforcement method is proposed for reinforced concrete frame structure with adding a web-type plate.The internal force optimum can be achieved by setting the web-type plate at a certain region between frame beams,and the bending moment of the beam-column joint will decrease.A multiple seismic defense lines frame structure can be formed with the web-type plate.A typical frame structure of 10 stories is designed as a case study.The effects of the layout,linear stiffness ratio,and reinforcement of the web-type plate on the structural performance are analyzed.The reinforcement ratio of the web-type plate to the column and beam is proposed.The seismic analysis shows that the lateral stiffness of the structure is improved,meanwhile the bending moment of the beam-column joint is reduced.The optimum layout position of the web-type plate is 0.3 and 0.7 of the beam span,and the suggested linear stiffness ratio of the web-type plate to column and beam are 0.7~1.5 and 3.5~7,respectively.Further,a suggested reinforcement ratio of the web-type plate is given by nonlinear parametric analysis to ensure that the plate yields first as designed.The nonlinear dynamic time-history analysis of an actual engineering project that seismic upgrading with the web-type plate is undertaken.The analysis results show that the lateral displacement,and the inter-story drift ratio of the structure with web-type plate are reduced.Compared with the structure before upgrading,the plastic hinges are reduced.The seismic performance of the frame structure reinforced with the web-type plate is improved.The analysis verify that the proposed strengthening method with web-type plate was reasonable and feasible.

关 键 词：抗震加固 框架结构 附加腹板 时程分析 

分 类 号：TU352.12[建筑科学—结构工程] TU375.4