某弦支穹顶屋盖地震响应的三维隔震控制

Three-dimensional Isolation Control for Seismic Responses of a Suspen-dome Roof

以潍坊鸢都体育馆屋盖为弦支穹顶结构的工程背景,分别采用研发的SRB和PCDSB作为屋盖的水平向和竖向隔震设备,以此设计了屋盖的S-P三维隔震层,利用子空间迭代法对隔震屋盖进行了动力特性分析,运用Newmark逐步积分法和四阶显式RungeKutta迭代法编制了求解隔震屋盖地震响应的非线性时程分析程序X,采用ABAQUS有限元软件验证了自编程序X的正确性,并利用程序X对Ⅷ度和Ⅸ度地震波作用下的未隔震和隔震屋盖的地震响应进行了对比分析.结果表明:隔震屋盖的前四阶振型表现为水平向和竖向振动相耦联的特点;相同烈度同条地震波作用下,隔震屋盖的地震响应较未隔震的有了明显降低;同条地震波作用下,Ⅸ度的隔震屋盖地震响应比Ⅷ度的要大;本文设计的隔震屋盖在低频脉冲型地震波作用下,仍能保持较低的地震响应.

Taking the Weifang Kite Capital Gymnasium roof for the engineering background of suspendome structure,and the SRB and PCDSB as the horizontal and vertical isolation equipment for the roof respectively,the S-P three-dimensional isolation layer of the roof was designed.By using subspace iteration method,the dynamic characteristics of the isolation roof were analyzed.The non-linear time history analysis procedure X based on the Newmark step-by-step integration method and the Runge-Kutta iterative method were used to solve the seismic responses of the isolated roof programmed.The validity of the procedure X was verified with ABAQUS finite element software,and the seismic responses of the non-isolation roof and the isolation roof under Ⅷ intensity and Ⅸ intensity seismic action were contrasted and analyzed with procedure X.The results have indicated that the first four vibration modes of the isolation roof are embodied for the coupling of the horizontal vibration and vertical vibration; the responses of the isolation roof are significantly less than that of the non-isolation roof under the same intensity and the same seismic action; the responses of the isolation roof of Ⅸ intensity are greater than that of Ⅷ intensity under the same seismic action; and the isolation roof designed by this method can still hold the lower seismic responses even under low frequency pulse action.