摘要
深圳某400m双塔连体项目结构体系为带伸臂、环桁架加强层的框架-核心筒双塔连体结构,包含东、西两座塔楼及连接体。受复杂建筑造型、较大风荷载及特殊场地风环境影响,在10年一遇风荷载作用下,塔楼于东南风来流方向呈现显著的动力响应,塔楼顶部风振加速度远超规范限值,导致舒适度不足。为解决此问题,拟采用调谐液体阻尼器(TLD)对塔楼进行风振控制。通过频谱分析识别结构风致响应的控制振型,并采用时程法对设置TLD结构进行风时程动力响应分析,结合敏感性分析获得最优TLD设计参数。结果表明:结构基底剪力及东塔顶部风振加速度频谱呈单峰特性,主要受东塔一阶平动振型控制;西塔顶部风振加速度频谱则呈双峰特性,同时受东、西塔一阶平动振型影响。在东塔顶部设置TLD可显著降低结构基底剪力及东、西塔的顶部风振加速度;而西塔顶部设置TLD仅能有效降低西塔垂直连接体方向的顶部风振加速度,对其沿连接体方向及东塔顶部的风振加速度和结构基底剪力均无明显控制效果。东、西塔顶部同时设置TLD后,塔楼的顶部风振加速度得到有效控制,满足规范限值要求。
The structural system of a 400m twin⁃tower linked project in Shenzhen features a frame⁃core tube configuration with outriggers and belt truss strengthening story,comprising eastern and western towers connected by connective structure.Due to complex architectural geometry,high wind loads,and unique site⁃specific wind conditions,under 10⁃year return period wind loads from the southeastern direction,the towers exhibit significant dynamic responses.Wind⁃induced accelerations at the tower tops substantially exceed code limits,resulting in occupant comfort deficiencies.To address this,tuned liquid dampers(TLDs)were proposed for wind vibration control.Spectrum analysis was employed to identify governing vibration modes of structural wind⁃induced responses.Time⁃history analysis was conducted to evaluate wind⁃induced dynamic responses of the TLDs⁃equipped structure,with parametric sensitivity analysis subsequently optimizing TLD design parameters.The results demostrate that the structural base shear and the wind⁃induced acceleration spectrum at the eastern tower top exhibit a single⁃peak characteristic,primarily governed by the first translational mode of the eastern tower.The wind⁃induced acceleration spectrum at the top of the western tower show a double⁃peak characteristic,influence concurrently by the first translational modes of both the eastern and western towers.TLDs installed atop the eastern tower significantly reduce base shear and wind⁃induced accelerations at both tower tops.However,TLDs at the top of the western tower only effectively mitigate accelerations perpendicular to the connective structure but show no significant control effect on accelerations along the connective structure direction,the accelerations at the top of the eastern tower,or the structural base shear.Furthermore,when TLDs are installed simultaneously at the tops of both towers,wind⁃induced accelerations are effectively controled,ensuring compliance with code⁃specified limits.
作者
崔济东
陈寅
廖耘
CUI Jidong;CHEN Yin;LIAO Yun(RBS Architectural Engineering Design Associates,Guangzhou 510180,China)
出处
《建筑结构》
北大核心
2025年第17期111-119,共9页
Building Structure
关键词
双塔连体结构
调谐液体阻尼器
风振加速度
双振型激励
频谱分析
twin⁃tower connected structure
tuned liquid damper
wind⁃induced acceleration
double mode excitation,spectrum analysis
