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在我国存量铁塔中存在不少服役20年以上的柔性腹杆塔架,为了对这种结构形式进行更深入的计算分析,本文分别采用了简化空间桁架法、分层空间桁架法与有限元法三种方法对正四边形柔性腹杆塔架进行了计算分析,对这三种计算方法的计算结果进行比较和分析。发现简化空间桁架法和分层空间桁架在计算柔性腹杆塔架塔柱内力时精度相当;计算柔性腹杆塔架中柔性腹杆内力时,简化空间桁架法计算结构有条件失效。本文得出了简化空间桁架法在计算柔性腹杆时的适用条件。
In our country, there are many flexible belly towers with more than 20 years of service in the stocking tower. In order to carry out more in-depth calculation and analysis of this structure form, this paper adopts simplified space truss method, stratified space truss method and finite element method III The method is used to calculate and analyze the positive quadrilateral flexible web tower, and the results of the three calculation methods are compared and analyzed. It is found that the simplified space truss method and the stratified space truss have the same precision in calculating the internal forces of the flexible web tower pylons. When calculating the internal force of the flexible webs in the flexible web tower, the simplified space truss method has a structural failure. In this paper, the applicable conditions of simplified space truss method in calculating flexible webs are obtained.