An efficient algorithm for sampling the shear-modulus reduction curve in the context of wave propagation using the elastoplastic Iwan model

SUMMARY The elastoplastic Iwan model has been used since the end of 1970s to simulate nonlinear soil behaviour in seismic wave propagation. In this work, we present an automatic algorithm efficiently sample shear-modulus reduction curve function shear deformation, which constitutes exclusive ingredient model. This requires data from shear- modulus as a are readily available literature and specific laboratory tests. method involves discretization interpolation these be used. quality solution depends on number interpolated points. However, larger them produce increase computational time. To overcome this, curve. We numerically prove that chosen strong impact calculation load, addition well-known dependence input motion amplitude level. Two tests propagation 1-D 3-D media show clear gain computation time when using proposed sampling algorithm.