考虑偶然偏心的消能减震优化设计  

Energy dissipation optimal design considering accidental eccentricity of structures

作　　者：陈敏[1] 陈伯望[1] 贺国京[1] 刘畅 

机构地区：[1]中南林业科技大学土木工程与力学学院,湖南长沙410004 [2]悉地国际设计顾问(深圳)有限公司,广东深圳518048

出　　处：《中南大学学报（自然科学版）》2015年第8期3124-3130,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51178473);湖南省教育厅科学研究青年基金资助项目(13B149)~~

摘　　要：基于偶然偏心增大结构的地震反应而影响减震结构消能部件的耗能效果,提出一种黏性液体阻尼器与防屈曲支撑混合减震策略:将阻尼器安装在底部隔震层消耗地震能量,防屈曲支撑安装在隔震层以上房屋四角,以便小震时提高结构抗扭刚度,减小偶然偏心的影响,大震时消耗地震能量。选择2栋长宽比分别为1.00和2.33的10层框架结构,采用ETABS与PERFORM-3D分别进行弹性与弹塑性时程分析。研究结果表明:偶然偏心对减震结构消能能力的影响不容忽视;当隔震层阻尼器适量时,增大防屈曲支撑抗侧刚度,消能减震效果显著改善;该减震策略所需消能部件较少,可确保建筑空间的利用效率,是一种具有实用价值的消能减震优化设计方法。Considering that accidental eccentricity magnifies the seismic response of certain structure and has impact on the energy dissipation components in structures, a combined energy dissipation strategy blending viscous-fluid damper with buckling-restrained brace was put forward. Dampers were installed on the isolation layer at the bottom to dissipate seismic energy, and buckling-restrained brace was installed at the four corners of the building above the isolation layer,which enhances torsional rigidity of the structure and relieves the impact of accidental eccentricity and facilitates dissipating seismic energy in earthquake. Besides, two 10-storey-framework buildings with length-width ratios of 1.00 and 2.33 were selected and elastic analysis and elastic-plastic time-history analysis were made by adopting ETABS and PERFORM-3D. The results show that the impact of accidental eccentricity on the dissipation capacity of damping structure can not be ignored. With a proper number of dampers at the isolation layer, the seismic response control effect is greatly improved when lateral rigidity of buckling-restrained brace is increased. This energy dissipation strategy requires fewer dissipation components and meanwhile can ensure the utilization ratio of architectural space. Therefore, it is an optimized design for energy dissipation structures and has practical value.

关 键 词：偶然偏心 消能减震 时程分析 优化 

分 类 号：TU352.1[建筑科学—结构工程] TU375.4