3D-Finite element modeling of lead rubber bearing using high damping material

Ahmad Basshofi Habieb,Gabriele Milani,Usman Wijaya,Tavio Tavio,M Olivia,R Ridwan,I.M Agus Ariawan,E Saputra,D Andrio,I.D Ketut Sudarsana,K Yamamoto,A Marto,M Infantri Yekti,G Wibisono,G Pringgana,D Wishart

doi:10.1051/matecconf/201927601013

Abstract

Lead Rubber Bearing (LRB) has been widely applied for seismic protection of mid and high-rise buildings around the world. Its excellent energy dissipation becomes the most important aspect of this isolation system thanks to the plasticity and recovery behavior of the lead core. Aiming to develop a deeper knowledge on the behavior of LRB’s, a 3D detailed finite element (FE) modeling is performed in Abaqus FE software. Some important parameters involved in the model are plasticity of the lead core and hyper-elasticity and viscosity of the rubber material. The parameters for rubber material are derived from the results of experimental works in the laboratory, including uniaxial tensile test and relaxation test. The bearing model is then subjected to a cyclic shear-test under constant vertical load. The result of the 3D-FE model is then compared with the analytic-Abaqus model for LRB isolators, developed in the literature. Finally, both 3D-FE model and analytic model result in a good agreement on the shear behaviour of the presented LRB.

Highlights

Base isolation system has been used widely to reduce the effect of an earthquake by damping the vibration of the structures which means reducing the frequency of the building or in other words increasing its period [1,2,3]
A good agreement on shear behavior is shown by the User Element (UEL) model compared to the 3D finite element (FE) model
A 3D FE modeling of Lead Rubber Bearing (LRB) using high damping material is performed in this work

Summary

Introduction

Base isolation system has been used widely to reduce the effect of an earthquake by damping the vibration of the structures which means reducing the frequency of the building or in other words increasing its period [1,2,3]. In the FE modeling, in addition to the plasticity properties of the lead core, the viscosity model is required for the rubber element. In the Abaqus 3D FE modeling, the hyperelasticity of rubber follows the Yeoh model [15] and the viscosity is characterized by Prony-series model [16, 17] Those two models require an optimization process of the experimental data. The result of 3D FE modeling makes a good agreement with the target properties from the manufacturer Through this 3D FE model, we can observe in detail the stress distribution in the isolator elements. A good agreement on shear behavior is shown by the UEL model compared to the 3D FE model This UEL is considerably helpful for structural analyses in Abaqus environment

Rubber properties

Lead core properties

The 3d Finite element modeling

Findings

Conclusions