张拉整体塔结构风荷载时程模拟及风振分析

Wind Load Time-History Simulation and Wind-Induced Vibration Analysis of a Tensegrity Tower

为研究张拉整体功能性建筑,比较分析了5种不同的风速功率谱函数,得知张拉整体塔结构的风荷载计算在一定高度内可以不考虑风速谱的变化;模拟了张拉整体塔结构不同高度处的风速时程,并转化为风荷载时程;对在465 MPa初始预应力状态下的结构进行了风振分析,得知其风振响应较小;比较分析了不同初始预应力下结构的风振响应,得知3种杆件的动静比都随预应力增大而增大,在一定范围内的不同初始预应力下结构各节点最大位移基本相等.

Five different kinds of power spectral density functions of wind speed are analyzed and compared, and it is obtained that the change in power spectral density functions of wind speed can be ignored in the calculation of wind load under a certain height range for the tensegrity tower. Then the wind speed time-history is simulated for different height of tensegrity tower, and transformed into wind load time-history. Wind-induced vibration response of the tcnscgrity tower under the prestress of 465 MPa is analyzed, and it is found that the wind-induced vibration response is weak. Furthermore, the wind-induced vibration response under different prestress are analyzed and compared. The results show that the seismic coefficients for three kinds of members increase as the prestress increases, and the largest displacements of all joints are approximately equivalent under different primary prestress within a certain range.