Ground - structure coupling non-linear seismic response analysis system

摘要

PROBLEM TO BE SOLVED: To simplify numerical calculation by taking an excessive water pressure value of a pore water pressure model into a shearing rigidity factor of earth skeleton element, obtaining an equivalent nodal force for each node, and calculating a non-linear oscillation equation containing an internal force and an external force through low area integration. ;SOLUTION: From a data input part 1, such pre-generated data 2 as a target ground, a structure, an input earthquake wave generated in advance is taken in, and based on this, a calculation part 3 generates a structure system as a to-be-analyzed object. A pore water pressure is calculated with a bawl model under non-drainage condition, and an effective stress of an earth particle skeleton following non-linear characteristics is calculated by the modified Ramberg-Osgood model. In addition, in order to evaluate non-linear characteristics caused by rigidity drop in reinforced concrete structure, a non-linear model is applied to material characteristics of solid element and beam element. In addition, as an algorithm for establishing a kinematics equation, one-point integration of explicit solution is employed, for simpler numerical calculation. Thereby 3D shape can be modeled as it is, to obtain a solution with simpleness but high precision.;COPYRIGHT: (C)1998,JPO