基于强震记录的建筑结构楼层设计谱研究

RESEARCH ON FLOOR DESIGN SPECTRUM OF BUILDINGS UPON STRONG EARTHQUAKE RECORDS

非结构部件地震损失占比远超结构部件已成为近年震害新现象,然而国内对非结构部件进行抗震设计所必需的楼层设计谱的研究尚不充分。通过选取工程强震数据中心(CESMD)中81栋结构所记录的1300条楼层加速度时程数据,研究了各类结构楼层峰值加速度放大系数沿结构高度的变化规律。研究结果表明:针对各类结构,GB 50011−2010中的位置系数严重低估了楼面加速度响应;GB 50011−2010及ASCE 7-16规范中部件放大系数取值存在对短周期非结构部件严重偏小,对于长周期非结构部件则过于保守的问题。与此同时,鉴于现行规范中相关参数并不能很好反映非结构部件的加速度放大特性,提出一种可考虑主体结构及不同输入地震动影响的楼层设计谱,可更好地用于非结构部件的抗震及分析。

The proportion of earthquake losses of nonstructural components far exceeds structure has become a new phenomenon of earthquake damage in recent years.However,the research on the floor design spectrum for the seismic design of nonstructural components in China is not sufficient.By selecting 1300 floor acceleration time history data recorded by 81 structures in CESMD(center for engineering strong motion data)strong earthquake database,studied the amplification law of peak acceleration amplification factor along the height of various structures.The results show that:GB 50011−2010 seriously underestimates the floor acceleration response for various structures;in GB 50011−2010 and ASCE 7-16 codes,the value of component amplification factor is seriously small for short periodic nonstructural components,and too conservative for long periodic nonstructural components.At the same time,in view of the fact that the relevant parameters in the current code cannot well reflect the acceleration amplification characteristics of nonstructural components,a floor design spectrum is proposed with a view towards considering the impact of the structure and different input ground motions,which can be better used for the seismic analysis of nonstructural components.