Because of the extensive use of longspan structures in modern engineering, much attention has been given to the extent to which ground motion phaselags affect the internal forces of such structures. In this paper, this problem is studied from the aspect of random seismic analysis, i.e. the random seismic responses of longspan structures are explored with the phaselags of the ground joints of the structures taken into account. The earthquake is regarded as a stationary random process. Formulae for calculating the random responses of the structural displacements and internal forces are derived. Numerical examples are presented which illustrate some basic features of such random response, and also show that the ground motion phaselags have considerable effects on structural safety analysis.
Engineering Computations – Emerald Publishing
Published: May 1, 1992