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对椭圆形弦支穹顶屋盖结构的动力特性和地震响应进行了有限元分析.分析中考虑了预应力大变形作用以及不同预应力水平的影响.通过结构前60阶自振频率和模态振型的对比分析,发现该弦支穹顶结构模态频率分布相当密集,以中间张弦穹顶的竖向自由振动模态为主.结构的地震响应计算结果表明,在多维多点非一致地震激励下,该弦支穹顶结构的位移响应以及环索、撑杆等重要构件的内力响应随着地震波波速的增大而减小,并逐步接近其一致地震激励下的动力响应.
The dynamic characteristics and the seismic response of elliptical suspen-dome roof structure are analyzed by finite element method. The effect of large prestress deformation and different prestressing levels are considered in the analysis. By means of the first 60 order natural frequencies and modal vibration The results show that the modal frequency distribution of the suspend-dome structure is quite intensive, and the vertical free-vibration mode of the middle truss dome is dominant.The seismic response calculation results of the structure show that under the condition of multi-dimension and multi-point non-uniform seismic excitation , The displacement response of the suspen-dome structure and the internal force response of the important members such as ring cables and struts decrease with the increase of the seismic wave velocity and gradually approach the dynamic response under the uniform seismic excitation.