中日基础隔震建筑抗风设计方法对比研究  

Comparative study of wind-resistant design methods for base-isolated buildings in China and Japan

作　　者：周云[1] 周和鸿 ZHOU Yun;ZHOU Hehong(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《地震工程与工程振动》2023年第4期14-25,共12页Earthquake Engineering and Engineering Dynamics

摘　　要：根据中国GB/T 51408—2021《建筑隔震设计标准》(简称中国隔标)和日本《隔震建筑物的抗风设计指南》(简称日本指南)等相关规范,从抗风设计目标、风荷载、风致响应计算和安全性评价等方面对两国基础隔震建筑抗风设计方法异同进行比较,并分别按两国规范对一基础隔震建筑进行顺、横风向抗风设计与分析,进一步说明两国设计方法的差异。分析研究表明:中国隔标和日本指南均采用舒适度和安全性两阶段设计,但舒适度和安全性设计风荷载的重现期不同,前者为10 a和50 a,后者为1 a和500 a;舒适度验算,中国隔标采用与频率无关的加速度限值,而日本指南采用与频率相关的加速度限值,且考虑感知概率;安全性阶段隔震层极限状态,中国隔标限制在弹性范围内,日本指南则允许进入塑性状态;中国隔标与日本指南对台风影响的考虑、脉动风速谱和等效风荷载计算方法均不同;风响应计算与安全性评价,中国隔标采用弹性方法验算隔震层位移在弹性范围内,不需任何安全性评价,但易出现隔震与抗风不协调,需采用变刚度抗风装置调整设计等措施;日本指南采用由隔震层和隔震构件剪力与屈服力的关系分为3个等级的弹塑性方法,根据不同安全性评价项目采取相应的评价方法,充分利用隔震构件性能抗风,一般不会出现隔震与抗风不协调。提出我国今后开展基础隔震建筑抗风研究的建议。According to Chinese“standard for seismic isolation design of building”(GB/T 51408—2021)(referred to Chinese isolation standard)and Japanese“guidelines for the wind-resistant design of seismically base-isolated buildings”(referred to Japanese guidelines)and other related codes,comparisons were made between Chinese wind-resistant design methods and Japanese guidelines for base-isolated buildings in terms of design objectives,wind loads,calculation of wind response and safety evaluation.A design for wind-resistance was carried out in along-wind and cross-wind direction based on the codes of the two countries respectively for a sample building to illustrate the differences of design methods.The analysis results show that both codes apply two-phase design method for comfort service ability and safety,but the requirement of the return periods of comfort and safety is different,which are 10 years and 50 years in Chinese isolation standard and 1 year and 500 years in Japanese guidelines separately.Frequency-independent acceleration limits are used of the comfort service ability evaluation in Chinese isolation standard,while frequency-dependent acceleration limits and perception probability are used in Japanese guidelines.For the limit state of the isolation layer in the safety phase,it is limited to the elastic range in Chinese isolation standard,but it is allowed to reach the plastic state in Japanese guidelines.The consideration of typhoon effects,wind speed spectrum and equivalent wind load calculation methods are different between the Chinese isolation standard and Japanese guidelines.For the wind response and the safety evaluation,the elastic method is used to verify that the displacement of the isolation layer within the elastic range in Chinese isolation standard.It does not require any safety evaluation,but wind-resistant devices have to be adopted since they are prone to be incompatible between the seismic isolation design and the wind-resistant design.The elasto-plastic method is used in Japanese gui

关 键 词：隔震 建筑 抗风设计方法 弹塑性设计方法 蠕变与疲劳 

分 类 号：TU352.1[建筑科学—结构工程] TU973