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以在天津塘沽区拟建的某张拉整体塔雕塑为背景,分析了预应力大小对张拉整体塔结构自振特性的影响规律。研究发现,张拉整体塔各阶自振频率随预应力的增大而增大,但10阶后的频率基本与预应力水平无关;在多遇地震和罕遇地震作用下,结构杆件内力变化和节点位移均满足规范要求,罕遇地震作用下各杆件动静比明显大于多遇地震,杆件动静比随初始预应力的增大而减小;罕遇地震下,结构在多维地震作用下的响应一般大于单维,XY向和XYZ向地震作用响应基本一致。
Based on a set of monolithic tower sculpture proposed in Tanggu District of Tianjin, the influence of prestressing on the natural vibration characteristics of the monolithic tower was analyzed. The results show that the natural frequencies of the tensioned whole tower increase with the increase of the prestress, but the frequency after the 10th order has nothing to do with the prestressing force. Under the action of frequent earthquakes and rare earthquakes, the internal forces The dynamic and static ratios of all members under rare earthquakes are obviously larger than that of multiple earthquakes, and the dynamic and static ratio of members decreases with the increase of initial prestressing force. Under rare earthquakes, The response is generally larger than the one-dimensional response, and the responses of XY and XYZ to the seismic response are basically the same.