作　　者： ; ;

机构地区： 同济大学土木工程学院土木工程防灾国家重点实验室

出　　处： 《同济大学学报（自然科学版）》 2003年第6期652-656,共5页

摘　　要： 在风洞中采用气动弹性模型技术和高频动态天平技术研究了两个高层建筑间的风致动力干扰效应 .根据气弹模型试验数据 ,采用随机减量法 (RDT)及特征系统实现算法 (ERA) ,首次研究了在受扰情况下高层建筑气动阻尼的变化 .在某些工况下 ,受扰建筑的气动阻尼为负值 (且绝对值较大 ) ,使结构总阻尼很低 ,导致了受扰建筑高的动力响应及高的动力干扰因子值 .根据受扰建筑的新的阻尼值 ,重新对高频动态天平试验的数据进行了计算 。 The wind induced interference effects on two identical tall buildings with square cross sections are experimentally researched in TJ 1 wind tunnel using aeroelastic model technique and high frequency force balance (HFFB) technique.Based on the acceleration response curve of the interfered building model in aeroelastic model test, the random decrement technique (RDT) and eigensystem realization algorithm (ERA) are applied to study for the first time the variation of aerodynamic damping of tall buildings before and after being interfered by adjacent buildings.In some conditions, the aerodynamic damping of the interfered building is negative and its absolute value is rather large,which reduces the total damping and results in high dynamic response of the interfered building and high dynamic interference effects.According to the modification of aerodynamic damping,the response of the tall building after being interfered in HFFB test is recalculated and the new results of dynamic interference effects are obtained,which are more close to the results of aeroelastic model test.

关 键 词： 高层建筑 动力干扰效应 气动阻尼 干扰机理

领　　域： [建筑科学] [航空宇航科学与技术] [航空宇航科学技术]