A simplified hysteretic model for steel dampers considering horizontal bidirectional deformations
CHEN Shuxian1, ZHOU Xin2, XIE Xu1
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;
2.Tonglu Transportation Development Group Corporation, Tonglu 311501, China
Abstract:In order to simply and effectively simulate hysteretic performance of steel dampers considering horizontal bidirectional deformations, a modified multi-shear spring (MMSS) model was proposed based on the multi-shear spring mechanical model and Menegotto-Pinto(MP) hysteretic model.MP model was taken as each springs’ hysteretic curve in MMSS model, and its basic mechanical parameters were determined with multi-directional elastoplastic deformations of steel dampers, its shape parameters were fitted by means of the self-adaptive genetic algorithm.Taking a commonly used U-shaped steel damper for example, through comparing the damper’s hysteretic curves under unidirectional cyclic displacements, horizontal bidirectional regular cyclic displacements and horizontal bidirectional random displacements obtained using finite element model and MMSS one, respectively, the results showed that MMSS model can accurately simulate hysteretic performance of the U-shaped damper considering horizontal bidirectional deformations, so the study provides a simple calculation method for steel dampers’ seismic response analysis.
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