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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。
Taking the double quadrangular pyramid truss with a rectangular hole in the middle of the elastic support as the research object, the static and dynamic characteristics of the open and the non-open truss structures were analyzed by SAP2000, The difference between the static and dynamic characteristics of the structure, and the variation of the internal forces and displacements of the central opening grid structure are obtained. The results show that there are significant differences in the internal force distribution between open-grid and un-opened grid chords, but the webs have no obvious difference. The dynamic internal force distribution and the static distribution of open-grid structure are consistent. The stiffness has been significantly improved.