【摘要】 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.更多还原

【Abstract】 The dynamic characteristics and seismic responses of a suspen-dome roof structure are analyzed,considering large deformational effects and different pre-stressed levels.The first 60 frequencies of the free vibration of the structure are studied.It is shown that the modal distribution of the semi-flexible structure is close,and the vertical vibrations of the structure are principal.Some computational results of the seismic response of the structure indicate that the displacement responses of the structure and the internal forces of the hoop cables,the brace struts and other important components under the non-uniform earthquake excitation decrease with the increase of the wave velocity,and are close to those under the uniform earthquake excitation gradually.更多还原