TIME DOMAIN METHOD FOR RANDOM VIBRATION ANALYSIS OF STRUCTURES SUBJECTED TO NON-STATIONARY SEISMIC EXCITATIONS
Random vibration analysis of structures subjected to non-stationary seismic excitations is of great concern to engineering practice. The power spectrum method is the most widely used approach in this respect. But the spectral method requires a large amount of numerical integrals in both frequency and time domains when non-stationary random excitations are involved. As an alternative,the feasibility of solving the problem in the time domain is investigated in this study. Motion equations of a structure are first transformed into the form of state equations and solved by the precise time integral method. Explicit expressions for structural random responses under non-stationary seismic excitations are then deduced in the time domain. On this basis, the covariance responses of the structure are directly obtained. Combined with the first passage failure criteria, the proposed method is further applied to dynamic reliability analysis of the structure under the action of earthquake. A frame structure is taken as an example to illustrate the application of the present approach. Numerical results indicate that the proposed method has perfect accuracy and reasonably high efficiency.
Non-stationary seismic excitations random vibration time domain dynamic reliability first passage failure criteria
Cheng Su Rui Xu
Department of Civil Engineering, South China University of Technology, Guangzhou 510640 China
国际会议
广州
英文
169-174
2010-12-17（万方平台首次上网日期，不代表论文的发表时间）