宿迁市文体馆基础隔震非线性时程分析研究

Nonlinear time-history analysis of base-isolated Suqian City Gymnasium

宿迁市文体馆 4 5 0 0座位 ,约 130 0 0m2 ,位于 8度抗震设防区 ,主体结构为钢筋混凝土结构空间框架 ,钢网壳屋盖。该工程采用基础隔震技术设计 ,在桩基顶面与上部结构之间设置架空层 ,用作安置设备管道及隔震层。隔震层由叠层橡胶隔震支座和粘滞阻尼器组成。对主体结构基础隔震采用空间模型非线性时程分析方法进行了详细分析 ,结果表明 :采用基础隔震措施可显著降低结构地震作用 ,上部结构水平地震作用减震系数可按 0 .2 5采用 ;设置附加粘滞阻尼器能较好地解决降低地震作用和限制隔震层位移之间的矛盾 ,对提高隔震体系的性能具有重要作用。技术经济比较表明 ,本工程采用基础隔震措施 ,具有明显的社会。

Suqian City Gymnasium is situated in a region of 8 degree of fortification intensity, 4500 seats, about 13000m 2. The principal structure includes base isolation layer (BIL), reinforced concrete spatial frame, and steel spatial grid roof. BIL located between pile caps and the super structure, mainly consisting of laminated rubber bearings and viscous dampers. By using SAP2000N software and a nonlinear spatial time history analyzing method, investigations for the base isolated system were implemented. Important results are as follows: (1) The horizontal earthquake action upon the super structure in base isolated system can be greatly reduced, and the discount rate is smaller than 0.25. (2) Viscous dampers effectively restrict the BIL displacement meanwhile do not increase the earthquake action. (3) Technical and economic comparison demonstrates that base isolated Suqian city Gyunasium possesses evident social and economic benefit.