斜拉网壳结构的非线性地震响应特性

Non-linear Earthquake Responses for Cable-stayed Reticulated Shell Structures

斜拉网壳结构是新型结构类型，可实现用较小构件截面尺寸跨越更大空间的要求．据此推导了空间杆单元几何非线性刚度矩阵，简述了斜拉索非线性问题，给出了地震作用下斜拉网壳结构非线性地震响应计算策略；数值分析了该类结构非线性地震响应问题。

The cable-stayed reticulated shell structures (CSRS) consist of cable,tower systems and reticulated shell structures(RSS).With cables,CSRS can cross larger span than RSS.This paper is focused on the research on the non-linear earthquake responses of the CSRS.A novel total lagrangian formulation of a 3-D bar element for large displacement and infinitesimal rotation analysis is developed by using the Taylor deploying formulation and variation principle.The non-linear analysis of a cable element is investigated.The computational strategies for the non-linear seismic responses of the structures subjected to an earthquake waves record are also developed.Some numerical examples are given.It is shown that in spite of subjected to the same earthquake waves record,the displacement peaked responses of different node of CSRS or RSS occur at different time.It is also obvious that the vertical responses are largely greater than the horizontal responses.For the different element,the ratio of the internal force obtained by using response spectra theory and time history response analysis respectively is rather different.