快速多点输入反应谱法在大跨空间网格结构中的应用

应用快速反应谱法分析了多点输入下大跨空间网格结构的地震响应, 通过对网架和网壳两种结构形式在一致输入和多点输入下结构节点的加速度响应对比分析,考查了两种输入方法下不同视波速时网架和网壳结构响应的差异和变化规律,并分析了视波速和结构跨度对这种差异的影响.其中,分别考查了多点输入下视波速为Vapp＝50,100,200,500 m/s共4种情况,同时考查了拟静力加速度对不同结构形式的结构响应的影响,为大跨空间结构设计提供理论依据.同时,计算表明,快速反应谱法是一种高效、精确的结构抗震分析方法,对于分析网壳、网架这样复杂大跨度结构在多点输入下的地震响应是很合适的,为理论和实践搭建了桥梁.

Application of the fast multi-support response spectrum method to long-span space lattice structures

The fast multi - support response spectrum method is applied the acceleration response analysis of long- span space lattice structures. The difference and change order of the structure response are studied generally under multiple support excitation and simple support excitation from two aspects , i. e. the displacement response variance for two structure forms, such as space truss, shell, including four apparent velocity Vapp = 50, 100,200,500 m/s under multiple support excitation. On the other hand, the effects of the pseudo static acceleration on the structure joint acceleration are also analyzed, which presents the theoretic foundation on aseismatic projects for long span space structures. Besides, it shows that the fast multi - support response spectrum method is efficient and precise, and it is applicable to the seismic response analysis of the complicate structure under multiple support excitation, such as long- span space lattice structure, by which the connection is built up from theoretical study to practical application.