【摘要】 以弹性支座下的中央开有矩形洞口的双层正放四角锥网架结构为研究对象,利用SAP2000对开洞网架和不开洞网架结构进行了静动力特性分析,对比了两种结构之间静动力特性的差异,并获得了中央开洞网架结构内力和位移的变化规律。结果表明:开洞网架与未开洞网架弦杆内力分布规律显著不同,但腹杆无明显区别;开洞网架结构的动内力分布规律和静力分布规律一致;加强洞口对网架的刚度有明显提高。更多还原

【Abstract】 As the research object,the double-layer pyramid grid structure with a rectangular opening in the central is studied under the elastic support.The analysis of static and dynamic behavior of space grid and space grid with opening is conducted by the FEM of SAP2000,and then,the differences between the two results are compared.The variation of the internal force and displacement is obtained.The results indicate that the distribution law of chord internal force between the space grid and space grid with opening is significant different,however,no obvious differences appear in the web member;the distribution of dynamic and static internal force of the grid with open hole represent consistently;reinforcing the hole of grid can improve the stiffness notably.更多还原