Response analysis of random vibration of highrise frames under random ground motion
LU Tie-jian,LI Fang,YU Zhi-wu (School of Civil Engineering and Architecture, Central South University, Changsha 410075, China)
In this paper, employing the continuum calculation model, based on the deformation characteristics of frame, the highrise frames are simplified as a vertical shear cantilever beam. Lateral random loads is modeled as stationary process of time parameter t, having nothing to do with its space position. The structural random response is obtained by mode-decomposition method. Given the mean value,the correlation formulae of the mean value,the covariance function and the square deviation of displacement response are derived. The proposed approach is a simple but effective to random vibration analysis of frame structures.