【摘要】 为了弥补索穹顶这种新型大跨空间结构在动力方面研究的不足,通过对120m跨度的肋环形索穹顶结构进行模态分析,得到了不同的参数对索穹顶结构的自振频率影响曲线;通过对其进行时程分析,发现了地震动的行波效应对结构的节点位移和杆件内力的影响规律,以及考虑多维地震与仅考虑地震单向输入之间的差别,为大跨空间结构的抗震设计提供了重要参考.研究表明,多点输入对于行波方向的位移影响显著,同时,对单元内力产生不利影响,因此,大跨度空间结构抗震分析中考虑行波效应与多维地震输入是必要的.更多还原

【Abstract】 Filling the blank in dynamic research on cable dome is a new kind of large-span space structure, whose 120()m()span cable dome was analyzed and the affection curve of cable dome frequency vs different (parameters) was obtained. Based on the time history analysis of the cable dome, the traveling-wave effect on the structure’s nodal displacements and post’s inner forces were found, and the difference between multi-dimensional seismic excitations and one-dimensional seismic excitation was obtained, which provided the important reference for anti-seismic design of large span space structures. The research indicates that the effect of the multi-dimensional seismic excitations to the displacement of the traveling-wave direction is (obvious) and that the effect to the element force is also negative, so it is necessary to consider the seismic traveling wave effect the and multi-dimensional seismic excitations in the anti-seismic analysis of large span space structures.更多还原