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本文提出的非线性动力分析方法适用于高耸钢塔在强风下的变形及极限承载力计算。它综合考虑了结构位移,P-⊿效应、杆件初弯曲、钢材弹塑性等多种非线性因素的影响,并可进行随机动力分析。计算速度亦比一般确定性的非线性动力分析方法快。本方法得到了钢塔模型非线性静力及动力实验结果的较好验证。通过对滨海电视塔所作的强风下的非线性动力分析,提出了一些对工程设计有参考价值的观点。
The nonlinear dynamic analysis method proposed in this paper is suitable for the calculation of deformation and ultimate bearing capacity of tall steel tower under strong wind. It comprehensively considers the effects of structural displacement, P-twist effect, initial bending of bar, elasto-plasticity of steel and other nonlinear factors, and can perform random dynamic analysis. The calculation speed is also faster than the general deterministic nonlinear dynamic analysis method. This method is well verified by the results of the nonlinear static and dynamic tests of the steel tower model. Through the analysis of nonlinear dynamics under strong winds made by the Coastal Television Tower, some viewpoints that have reference value for engineering design are put forward.