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三层网架是基于双层网架的一种新的结构形式 ,适用于大跨度屋盖类结构。三层网架具有刚度大 ,内力分布均匀 ,节省钢材 ,制作安装方便等优点。本研究根据子空间迭代法和振型迭加反应谱法 ,用For tran 90语言编制了网架结构动力分析程序 ,对 5种不同形式的四角锥体系三层网架在不同跨度、不同高度、不同场地和不同烈度区的自振特性及其竖向地震反应进行了分析研究 ,指出了三层网架的自由振动特性及其竖向地震内力分布规律。分析结果表明 :斜搁四角锥三层网架和斜放四角锥三层网架是两种较好的三层网架形式
The three-tier grid is a new structure based on the double-shelves, which is suitable for long-span roofs. Three-tier grid with a rigid, uniform distribution of internal forces, saving steel, production and installation of convenience. In this study, based on the subspace iterative method and the modal superposition response spectrum method, the power analysis program of grid structure was compiled by For tran 90 language. Five different types of pyramidal three-layer grids were constructed at different spans, The natural vibration characteristics and vertical seismic responses of different sites and different intensity regions are analyzed and studied. The free vibration characteristics of the three-layer grids and the distribution laws of the vertical seismic forces are pointed out. The analysis results show that the three-tier grid with oblique quadrangular pyramid and the three-tier grid with obliquely pyramid are two kinds of better three-layer grid