钢结构广播电视塔风振系数的计算与对比

Calculation and comparision of vibration coefficient of steel television tower under wind load

研究了建于塔座上的钢结构广播电视塔在三种情况下计算的风振系数 ,一种是规范方法 ,另一种是按理论方法不考虑钢塔与塔座的共同作用 ,第三种是按理论方法考虑钢塔与塔座的共同作用。对三者进行了比较 ,最后得出结论 :在一般情况下 ,用规范方法计算的风振系数比按理论公式计算的风振系数要大 ,因此用此风振系数计算的钢塔内力是偏大的。有大的集中质量 (塔楼、平台、天线等 )处 ,应根据实际情况 ,把用规范方法计算的风振系数适当增大 ,以符合实际情况。按理论公式计算的风振系数在考虑与不考虑塔座和钢塔共同作用情况下的差别不大。

In this paper,the vibration coefficients of the steel television tower on concrete tower support under wind load are researched under three kinds of conditions.The first is the method specified in the criterion.The second is the theoretical method neglecting the interaction between the steel tower and its tower support.The third is the theoretical method considering the interaction between the steel tower and its tower support.By analyzing the results under three kinds of conditions,some conclusions are given.In general,the vibration coefficients with normal method are larger than with theoretical method.Therefore,the inner force of steel tower calculated with normal method is on the high side.In the big concentrated quality place,the vibration coefficients with normal method should be enlarged to fit the fact.The vibration coefficients with the theoretical method considering the interaction between the steel tower and its tower support are no large difference with neglecting the interaction between the steel tower and its tower support.