NUMERICAL SIMULATION OF NEAR-FAULT GROUND MOTIONSAND INDUCED STRUCTURAL RESPONSES

摘要

In this paper, a 3D quasi-dynamic model is developed to simulate the rupture and healing processes of aburied fault plane. Based on the integral representation theory, the formulation of the near-fault grounddisplacement can be derived for a 3D half-space by means of the slip function of the fault plane as well asthe Green's function due to a unit point source within the half-space. Hence, the directivity effect andradiation pattern of near-fault ground motions can be determined. Furthermore, based on the simulatedtypical pulse-like near-fault ground motions, the induced earthquake performance and the requiredductility demand of a 12-level steel frame are evaluated. The results show that the distributions of thestructural response and ductility demand are in accordance with the growth and decline of ground velocitypulse. Furthermore, it can be found that, within the pulse-affected area, the maximum story drift ratios fordifferent story levels are much different from each other, and the larger maximum story drift ratios areinduced at lower story levels.