湖南大学学报（自然科学版）2024，Vol.51Issue(11)：177-186,10.DOI:10.16339/j.cnki.hdxbzkb.2024119
基于提离模型的基础隔震结构支座拉应力研究
Research on Bearing Tensile Stress of Base Isolation Structure Based on Bearing Lift-off Model
摘要
Abstract
The tensile stress of rubber bearings is critical for the design of isolated structures.To study the force state of isolation bearings after the occurrence of tensile stresses,a hypothesis of bearing lift-off behavior is proposed,and the lift-off state is summarized as a force-balanced bearing reduction system,thus obtaining a straightforward solution for the lift-off state.The concept of load equivalent eccentricity,which is suitable for measuring overturning effect,is proposed by analogy with eccentric compression members,and a conversion coefficient is adopted to express load combinations uniformly,so as to obtain a more concise expression.The analytical formulas of equivalent eccentricity,internal force and stress of bearing and overall rotation angle at each stress stage were derived.The critical average compressive stress of bearing was proposed,and the corresponding height-width ratio limits were calculated.The results show that the tensile stress of the bearing is mainly affected by horizontal earthquake action,height-width ratio,bearing performance and arrangement;in the area of 8 degrees(0.2g),8 degrees(0.3g),9 degrees(0.4g),the limit of the equivalent eccentricity when the bearing is allowed to have tensile stress is 0.24,0.22,0.2,respectively,and the height-width ratio limits is 4.5,3.5,2.5,respectively.关键词
抗震设计/基础隔震/支座拉应力/高宽比限值Key words
seismic design/base isolation/bearing tensile stress/height-width ratio limits分类
建筑与水利引用本文复制引用
王彦,肖逸夫,尚守平..基于提离模型的基础隔震结构支座拉应力研究[J].湖南大学学报（自然科学版）,2024,51(11):177-186,10.基金项目
国家"十二五"科技支撑计划项目(2015BAL03B01),National"12th Five-Year"Science and Technology Support Project(2015BAL03B01) （2015BAL03B01）
