高耸结构P-Δ效应分析的精度问题

Accuracy of P-Δeffect analysis of tall structures

结构,如广播电视塔、高桥墩和烟囱等,在风荷载和地震力的作用下会发生较大的水平变位.塔,其塔楼的重量还相当大.因此,这一类结构的P-Δ效应比较显著.文中提出了侧力作用下效应分析的一个精确方法,以它为基础,从理论上透彻地研究了各种近似方法的精度问题.此到的启示可以用来改善高耸柔性结构考虑P-Δ效应的风振和地震反应计算.

Tall slender structures,such as television towers,tall chimneys and tall piers,produce large dis-placement under the action of strong winds a nd earthquakes.Therefore,the P-?effects of such structures are noticeable.A n accurate method is proposed to do the P-?effect analysis of a bending cantil ever column sub-jected to a lateral load.And the accuracy problems of various approximations are investigated thoroughly.By the enlightenment from the acc urate method(dividing finely the tall structure under analysis effect is consid ered),the computation of wind or earthquake response of the tall structure can be improved.