Extended hysteretic bilinear models for laminated rubber bearings

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420480
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: University of Yamanashi
• Principal Investigator: YOSHIDA Junji 山梨大学, 総合研究部, 准教授 (90345695)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 積層ゴム支承 / 復元力特性 / バイリニアモデル / 最大経験ひずみ依存性 / ハードニング / 水平2方向モデル

Outline of Final Research Achievements

Two hysteretic models for reproducing restoring forces of laminated rubber bearings are proposed. One is including only hardening effects in large deformation range and the other is modeling experienced shear strain dependency in addition to the hardening effect. Tangent modulus of those models are also derived. The key point of those models is that they are extended directly from bilinear hysteretic model, and the restoring forces of them could be computed easily by using the bilinear model. Then, those models are extended into 2D model with the aid of classical elasto-plastic heory. Finally, their accuracy in predicting seismic responses is evaluated. From the seismic response analysis, it is found that modeling of the hardening and the experienced shear strain dependency are important factors in order to accurately predict responses of the piers and bearings in base-isolation bridges

Free Research Field

耐震工学