木构古建筑摇摆类比模型震能辅助动态复位研究  

Dynamic resetting responses of the ancient-timber-building-inspired simultaneous rocking model facilitated by post-peak seismic energy

作　　者：刘英棨 李航[1] 汪威 梁枫 张锡成[4] LIU Yingqi;LI Hang;WANG Wei;LIANG Feng;ZHANG Xicheng(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430074,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430034,China;Faculty of Engineering,The University of Hong Kong,Hong Kong 999077,China;School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]武汉理工大学交通与物流工程学院,湖北武汉430074 [2]中铁大桥院桥梁绿色与智能建造全国重点实验室,湖北武汉430034 [3]香港大学工学院,中国香港999077 [4]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2024年第5期762-772,共11页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：科技部重点研发计划(2023YFC3806800);中央高校基本科研业务费专项资金资助(233102006)。

摘　　要：木构古建筑结构体系复杂,其立柱设置受“侧脚”与“生起”构造要求制约,地震作用下将触发同层柱群摇摆行为,从而在各层楼板间形成双向缓坡滑移结构体系,抵御地震侵袭.为探究中国木构古建筑在地震作用下的耦合滑移响应,利用W型界面滑块建立双向缓坡滑移结构体系类比“理论”模型,设置滑动面库仑摩擦系数表征体系滑动阻尼,选取40条近场水平地震波,并依据峰值地震加速度(PGA)数值及其时刻划分地震波“峰时”及“峰后”阶段参数,运用刚体运动学数值积分提高实时滑移计算精度,开展类比模型多参数动力滑移时程响应分析.研究结果表明:各类型近场水平地震作用下,具有3°缓坡和0.05界面摩擦系数的类比模型的最大相对滑移均发生在相应地震的“峰时”阶段,且幅值均小于对应地震峰值位移(PGD)幅值的2倍,并且PDG对低摩擦类比模型地震耦合滑移行为影响显著;各地震“峰后”残余能量可有效辅助缓坡刚体滑块动态复位,3~5°W型缓坡搭配0.03~0.06界面摩擦系数时效果最佳.To investigate the coupled seismic sliding responses and the possible application of this system,its equivalent analytical model is established in this study by using W-shaped sliding block and coulomb law of friction.Forty near-field horizontal seismic waves are selected,and the parameters of‘peak stage’and‘post-peak stage’of seismic waves are divided according to the peak seismic acceleration(PGA)value and its time.The precision of real-time sliding calculation is achieved using rigid body dynamic analysis and the parametric studies on the dynamic sliding time history performances are conducted.The results suggest that:1)for a W-shaped sliding block with 3°inclination and 0.05 coefficient of friction at the interface,the maximum relative sliding displacements always occur during peak stage of individual ground motions,while the values are strongly associated with peak-ground displacement(PGD)and are kept below 2 times of that PGD in individual ground motions.2)The seismic energy at‘post-peak’stage of earthquakes indeed facilitates dynamic self-centering responses,i.e.resetting behavior,of the sliding block,and the most favorable performances can be achieved within inclination and coefficient of friction as 3~5 degrees and 0.03~0.06,respectively.

关 键 词：刚体动力模型 韧性摇摆体系 滑移时程响应 木构古建筑 动态复位 

分 类 号：TU366.2[建筑科学—结构工程]