球面网壳结构风振响应时程分析

利用线性自回归滤波器法(AR法),编制了大跨空间结构的风速时程模拟程序,通过算例验证了该方法对大跨空间结构具有的良好适用性.将模拟出的风荷载作用于单层球面网壳,用有限元程序ANSYS进行了网壳结构的风振响应时程分析.通过时程分析结果与频域法的相应计算结果的对比,发现时程分析法与频域法的计算结果基本吻合,时程响应的峰值远大于静风响应,频域法的风振系数略大于时程法的结果.

Time-History Analyses of Wind Vibration Response of Spherical Latticed Shell Structures

In this paper,according to the principle of linear auto-regressive model(AR Model),a time-history simulation program of wind velocity is proposed for large-span spatial structures,and the feasibility of the proposed program is verified by a practical example.The simulated wind vibration loads are then applied to the time-history analysis of wind vibration response of single-layer spherical latticed shells by the finite-element program ANSYS.Through comparing the results obtained by the time-history analysis with the computational ones obtained by the frequency-domain method,it is found that the results of the time-history analysis are agreement with ones of the frequency-domain analysis on the whole.But the peak values of the time-history response are far exceed those of the static-wind response,and the wind-vibration coefficient of the frequency-domain method is bigger slightly that of the time-domain method.