Random Vibration Analysis Of Lattice Shells Subjected To Multi-dimensional Earthquake Inputs

The pseudo excitation method, a highly efficient algorithm for random vibration proposed by J. H. Lin et al was employed and was further developed in the present study. This method is a fast and accurate CQC method, in which all the cross-correlation terms between the participant modes are involved, therefore, it is more suitable for the dynamic analysis of lattice shells which are usually characterized with closely spaced natural frequencies and coupled vibrations modes. Based on the method, a computer program has been developed for the random vibration analysis. Then, studies were performed for a double-layer spherical lattice shell to investigate its seismic performance under multidimensional earthquake inputs, in which various span-depth ratios are considered so that the variation of seismic response could be obtained. The results for multidimensional earthquake inputs are also compared with those for single dimensional earthquake inputs. Some useful conclusions are obtained. The present study is of practical importance for the design and application of lattice shells in seismic regions.