某大跨拱形空间结构多维地震响应分析

Multi-dimensional seismic responses of large-span arch spatial structure

对于结构形式较为复杂的大跨空间结构在分析和设计时，采用单维地震的输入方式势必忽略了结构受力过程中的空间效应影响．本文以银川中房集团64m跨钢结构大门为实际工程背景，采用有限元动力时程法，分析比较了此类大跨空间结构在单维、两维及三维地震输入时的位移和内力响应情况．结果表明：三维地震输入在y、z方向的动位移高于单维输入时的14～18倍；三维地震输入对结构的动内力是单维输入的2～3倍．

For more complex structure of large-span spatial structures in the analysis and design, using single dimensional seismic input ignored the process of structural forces of spatial effects. This paper based on the YinChuan ZhongFang group 64 meters span steel structure gate for practical engineering background, using the finite element method for dynamic process, analysis and comparison of large spatial reticulated structures, single dimensional, two dimensional and three dimensional seismic input displacement and internal force of the response. The results shows that. three dimensional seismic input y and z direction in the dynamic displacement is higher than the single dimensional seismic input 14 to 18 times~ three dimensional seismic input in the structure dynamic force is higher than the single dimensional seismic input 2 to 3 times.