Experimental study on mechanical properties of steel plate weakened laminated rubber bearings

doi:10.3785/j.issn.1008-973X.2024.07.013

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (7): 1436-1445 DOI: 10.3785/j.issn.1008-973X.2024.07.013

Experimental study on mechanical properties of steel plate weakened laminated rubber bearings

Qianying MA1(

),Bingbing LI1,Jiachao YE1,2

1. School of Civil Engineering, Chang’an University, Xi’an 710064, China
2. Northwest Electric Power Design Institute Limited Company of China Power Engineering Consulting Group, Xi’an 710075, China

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Abstract

A new type of steel plate weakened laminated rubber bearing was designed, combining the advantages of thick rubber bearings and ordinary laminated rubber bearings. By adjusting the number and position of annular steel plates, the horizontal and vertical stiffness of the bearing were effectively controlled. The hysteretic characteristics, stiffness characteristics, and energy dissipation characteristics of the bearings with three central rubber layer thicknesses were studied. Based on the series-parallel model, calculation models for horizontal and vertical stiffness were established. Experimental results showed that compared with ordinary laminated rubber bearings, the steel plate weakened laminated rubber bearings had lower horizontal and vertical stiffness, higher horizontal and vertical energy dissipation ratios, and smoother and fuller hysteresis curves. The calculation results of the proposed model were in good agreement with the experimental results, with absolute errors of less than 10%. The proposed model had good accuracy and applicability in evaluating the horizontal and vertical stiffness of steel plate weakened laminated rubber bearings.

Key words： rubber bearing steel plate weakened series-parallel model three-dimensional isolation hysteretic characteristic

Received: 12 June 2023 Published: 01 July 2024

CLC:

TU 352.1

Fund: 国家自然科学基金资助项目（51208041）；陕西省自然科学基金资助项目（2020SF-382，2014JM2-5080）；长安大学教学改革研究项目（20211822300103292815）.

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Cite this article:

Qianying MA,Bingbing LI,Jiachao YE. Experimental study on mechanical properties of steel plate weakened laminated rubber bearings. Journal of ZheJiang University (Engineering Science), 2024, 58(7): 1436-1445.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.07.013 OR https://www.zjujournals.com/eng/Y2024/V58/I7/1436

钢板削弱型叠层橡胶支座力学性能试验研究

结合厚层橡胶支座和普通叠层橡胶支座的优点设计新型钢板削弱型叠层橡胶支座，通过调节环形钢板的总数和位置进行支座水平和竖向刚度的有效控制. 选择3种中心橡胶层厚度的钢板削弱型叠层橡胶支座，分析所设计支座的滞回特性、刚度特性和耗能特性. 基于串-并联模型，构建水平和竖向刚度的计算模型. 试验结果表明，相比普通叠层橡胶支座，钢板削弱型叠层橡胶支座的水平和竖向刚度更低，水平和竖向耗能比更高，滞回曲线更光滑饱满. 所建模型的计算结果与试验结果的一致性较好，误差绝对值不超过10%. 所建模型在评估钢板削弱型叠层橡胶支座的水平和竖向刚度方面具有较高的精度和适用性.

关键词： 橡胶支座, 钢板削弱, 串-并联模型, 三维隔震, 滞回特性

Fig.1 Schematic diagram of steel plate weakened laminated rubber bearings

Tab.1 Parameter for four types of laminated rubber bearings

Fig.2 Horizontal and vertical loading equipment diagram

Tab.2 Test condition for correlation between horizontal performance of laminated rubber bearings

Fig.3 Hysteresis curves of laminated rubber bearings under different shear strains

Fig.4 Variation of equivalent horizontal stiffness and damping ratio for laminated rubber bearings with different shear strains

Fig.5 Hysteresis curves of laminated rubber bearings under different compressive stresses

Fig.6 Variation of equivalent horizontal stiffness and damping ratio for laminated rubber bearings with different compressive stresses

Fig.7 Hysteresis curves of laminated rubber bearings under different loading frequencies

Fig.8 Variation of equivalent horizontal stiffness and damping ratio for laminated rubber bearings with different loading frequencies

Fig.9 Force-displacement curves of laminated rubber bearings under different compressive stresses

Fig.10 Variation of vertical stiffness for laminated rubber bearings with different compressive stresses

Fig.11 Force-displacement curves of laminated rubber bearings under different loading frequencies

Fig.12 Variation of vertical stiffness for laminated rubber bearings with different loading frequencies

Fig.13 Shear deformation and stiffness model of steel plate weakened laminated rubber bearings

Tab.3 Test value and theoretical value of horizontal stiffness for laminated rubber bearings

Fig.14 Vertical stiffness model of steel plate weakened laminated rubber bearings

Tab.4 Test value and theoretical value of vertical stiffness for laminated rubber bearings


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