随机地震激励下柔性连接双塔连体结构位移参数分析  

Parameter Study on the Displacement of Corridor Flexiblely-connecting Twin-tower under Stochastic Seismic Excitation

作　　者：侯家健[1,2] 韩小雷[1] 谭平[4] 焦柯[3] 彭文海[4] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]巴马丹拿建筑及工程师有限公司,中国香港 [3]广东省建筑设计研究院,广东广州510010 [4]广州大学工程抗震研究中心,广东广州510006

出　　处：《工程抗震与加固改造》2009年第3期65-72,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：广州市建设科技发展基金项目(2006)25

摘　　要：以3-DOF力学模型推导了柔性连接双塔连体结构在随机地震激励下各位移传递函数和均方值,采用数值计算进行参数分析,变量包括连体与塔楼以及塔楼与塔楼的质量比,连体对塔楼的频率比,连体支座阻尼比,随机地震激励包括白噪声和金井清谱。对于对称塔楼结构,其基本规律和TMD结构相同,但为控制支座位移需采取不同于TMD结构的策略,即连体的固有频率需避开塔楼自振频率以免共振,且宜增加连体支座的阻尼比及连体对塔楼的质量比。对于不对称塔楼结构,双塔对连体部分异步驱动,连体在两支座约束下的固有频率需避开两个塔楼自振频率,并且可通过调整两支座刚度的比例使两支座的相对位移趋于均匀。The transfer function and RMS of displacement for corridor which is flexiblely connecting twin-tower and excited with stochastic seismic are deduced based on 3-DOF model. The numerical parameter analysis is applied, the variables include mass ratios between towers and of corridor to tower, frequency ratios of corridor to tower and between towers, the damping ratios of two corridor＇ s supports, and the stochastic excitation includes white noise and Kanai-Tajimi spectrum. For symmetric towers structure, the basic principles are same with tuned mass damper structure, but different strategy should be adopted, e.g. the frequencies of corridor and of the tower should keep away to avoid resonance, the damping ratio of corridor＇ s supports and the mass ratio of corridor to tower should be increased. For asymmetric structure, the towers drive the corridor asynchronously, the corridor＇s frequency should keep away to that of any tower, and by adjusting the ratios between two corridor-supports＇ stiffness, even relative displacements of two supports can be achieved.

关 键 词：连体结构 柔性连接 随机分析 相对位移 质量调谐阻尼器 异步驱动 

分 类 号：TU973.2[建筑科学—结构工程]