海南中学图书馆结构减震设计

Seismic design of Hainan Middle School Library structure

海南中学图书馆属于高烈度地区的重点设防类结构。为提高建筑结构的抗震性能,响应国家推广减隔震结构的政策,本工程采取减震设计方案。其中图书馆主楼地上8层,建筑楼层高、地震作用大,采用BRB减震设计。通过小震弹性时程和大震弹塑性时程分析,全面评估了BRB及主体结构性能状态。分析可知,小震时BRB处于弹性状态,为主体结构提供抗侧刚度,减少了主结构分担的地震力;大震作用时,BRB进入屈服,除提供一定的附加刚度,还通过附加阻尼的形式耗散了地震能量,起到了第一道抗震防线的作用。图书馆裙房楼层较低,选用墙式黏滞阻尼器减震方案。黏滞阻尼器在小震下提供耗能,附加阻尼比不低于3%,减小了结构地震响应。大震下阻尼器滞回曲线饱满,耗散地震能量的同时保护了主结构安全。

The Hainan Middle School Library is a key defensive structure in high-intensity areas.In order to improve the seismic performance of building structures and respond to the national policy of promoting seismic reduction and isolation structures,this project adopts a seismic reduction design scheme.The main building of the library has a total of 8 floors,and due to its high height and strong seismic effect,BRB seismic design is used.Through elastic time history analysis of frequent earthquakes and elastoplastic time history analysis of rare earthquakes,the performance status of BRB and the main structure was comprehensively evaluated.Analysis shows that BRB is in an elastic state during frequent earthquakes,providing lateral stiffness for the main structure and reducing the seismic force shared by the main structure;In rare earthquakes,BRB yields,not only providing additional stiffness,but also dissipating seismic energy through additional damping,serving as the first line of seismic defense.The library podium is relatively low,and a wall type viscous damper is used.Viscous dampers dissipate seismic energy under frequent earthquakes,with an additional damping ratio of no less than 3%,reducing the seismic response of the structure.Under rare earthquakes,the hysteresis curve of dampers is full,dissipating seismic energy while protecting the safety of the main structure.