IMPROVED LUMPED MASS MODEL WITH ACCURATE LOAD-DISPLACEMENT RELATIONSHIPS FOR NONLINEAR DYANAMIC ANALYSIS(Structures)

Abstract

Lumped mass model is often used in nonlinear dynamic analysis for its simplicity. But it may not be appropriate for estimating the response of the frame model, because it is difficult for the lumped mass model to evaluate the effect of increasing plastic members. Improved lumped mass model with multi-springs is proposed in this paper to provide more accurate load-displacement relationships. This study demonstrates that proposed model provides good estimates of the response of the frame model.