某大底盘双塔高位连体减震结构振动台试验研究  

Shaking table test of high-position connected seismic reduction structure with large chassis and twin towers

作　　者：蔡正[1,2] 潘文 赖正聪[1,2] 苏何先 陈文科[3] 唐剑华 CAI Zheng;PAN Wen;LAI Zhengcong;SU Hexian;CHEN Wenke;TANG Jianhua(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650599,China;Earthquake Engineering Researching Center of Yunnan,Kunming 650599,China;General Research Institute of Architecture&Planning Design Co.,Ltd,Chongqing University,Chongqing 400045,China;T.Y.Lin International Engineering Consulting China Co.,Ltd,Chongqing 401121,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650599 [2]云南省抗震工程技术研究中心,云南昆明650599 [3]重庆大学建筑规划设计研究总院有限公司,重庆400045 [4]林同棪国际工程咨询(中国)有限公司,重庆401121

出　　处：《建筑结构学报》2023年第10期1-14,共14页Journal of Building Structures

基　　金：国家重点研发计划(2020YFD1100703-04);住房城乡建设部科学技术计划(2019-K-045)。

摘　　要：为研究高烈度设防区大底盘双塔高位连体减震结构的抗震性能,制作了缩尺比1/36的模型结构,分别对设置阻尼器或不设置阻尼器的模型结构(分别简称“减震结构”“非减震结构”)进行振动台试验,对比分析连体结构的动力特性、破坏特征、加速度、位移和应变响应。结果表明:8度多遇地震作用下,模型结构未发生破坏,基本为弹性状态;随地震作用的增大,模型结构的损伤逐渐累积,加速度放大系数逐渐减小,连接体上部和裙房附近的主塔楼层及副塔中、下部楼层的剪力墙连梁、框架梁端、框架柱端为结构主要损伤部位;罕遇地震作用下,主桁架下弦杆与主塔框架柱连接节点处混凝土表面出现细微裂缝,但连接体未发生明显损伤;连接体以上结构鞭梢效应显著,其楼层加速度、位移及扭转等地震响应增大明显;减震结构中黏滞阻尼器滞回曲线饱满,产生了良好的减震效果;相较于非减震结构,减震结构的层间位移角和顶部扭转角均有不同程度的降低,罕遇地震作用下最大减震率分别为94.6%和92.1%,减震结构层间位移角未超过规范限值,满足“小震不坏”和“大震不倒”的抗震设防要求;应变分析结果表明,设置阻尼器后,连体部位的应力改善效果优于结构底部的,建议适当提高结构底部构件的延性。In order to study the seismic performance of high-position connected seismic reduction structure with a large chassis and twin towers in high seismic intensity regions,a 1/36 scaled model with or without energy dissipating devices(referred to‘seismic reduction structure'and‘non-damping structure')was tested respectively on the shaking table to study and compare the seismic behavior of the model structure.The dynamic properties,failure characteristics,accelerations,displacements and strains of the model structure were analyzed.The experimental results show that the structure suffered no significant damage,and it remained nearly elastic under the frequent intensity levels of degree 8.With the increase of the ground motion intensity,damage gradually accumulated,and the acceleration amplification factors of the building decreased accordingly.The main damage to the model structure occurred at the ends of the coupling beams,frame beams and the frame columns of the upper part of the connecting body floors and the main tower floors near the annex;it also appeared in the middle and lower floors of the affiliated tower.Under the rare intensity level,subtle cracks appeared on the concrete surface at the joints between the lower chord of truss and main tower frame column,but there was no obvious damage to the connecting body.The main tower above the connecting body had an evident whipping effect,resulting in obvious increases in the seismic response of floor acceleration,inter-story drift and torsion angles.The hysteretic curve of viscous dampers of high-position connected seismic reduction structure is plumper,demonstrating good damping effect.The inter-story drift ratios and torsion angle at the top of seismic reduction structure are lower than the corresponding non-damping structure,and the maximum damping rate under rare earthquake is 94.6%and 92.1%,respectively.The inter-story drift ratios of the model structure did not exceed the limit of the current seismic code;the requirements of no damage under frequent earthqu

关 键 词：连体结构 消能减震 振动台试验 动力特性 抗震性能 

分 类 号：TU973[建筑科学—结构工程] TU317.1