三星堆古蜀文化遗址博物馆结构设计与减震分析

Structural design and energy dissipation analysis of Sanxingdui Museum of Ancient Shu Cultural Relics

三星堆古蜀文化遗址博物馆采用钢框架结构,展厅区域屋面采用组合网架结构,结构平、立面及空间关系较为复杂。为改善结构抗震性能,达到预期的抗震性能目标,本项目进行了消能减震设计,设置了屈曲约束支撑及黏滞阻尼器。简要介绍了该项目的结构体系及设计重难点,并重点论述了该项目结构减震设计思路,对各水准地震作用下结构附加有效阻尼比与能量耗散情况、减震结构与非减震结构的地震响应,罕遇地震下结构弹塑性损伤情况等进行考察。结果表明:罕遇地震作用下,减震结构的楼层剪力、层间位移角等结构整体指标明显减小,屈曲约束支撑及黏滞阻尼器滞回曲线饱满,耗散了较多地震能量,结构的抗震性能与安全储备得到提高,达到了预期的减震设计目标与抗震性能目标。

Sanxingdui Museum of Ancient Shu Cultural Relics adopts the steel frame structure.The roof of the exhibition hall area adopts a composite grid structure,and the structural plane,facade and spatial relationship are rather complicated.To improve the structural seismic performance and achieve a given performance objective,this structure was designed applying supplemental passive energy dissipation methods,which equipped with buckling restrained braces(BRB)and viscous fluid dampers(VFD).Structure system and key points of this project were briefly introduced,and the structural damping design methods of the project were discussed in detail.The additional damping ratio and energy dissipation of the structure under each level of earthquake,the seismic response of the damping structure and the non⁃damping structure,and the elastoplastic damage of the structure under rare earthquakes were investigated.The results show that under the action of rare earthquakes,the overall indicators of the structure such as floor shear force and inter⁃story displacement angle of the damping structure are significantly reduced.The hysteretic curves of BRBs and VFDs are full,which dissipates more seismic energy.The seismic performance and safety reserve of the structure are improved,and the expected damping design goals and seismic performance goals are achieved.