Study on the horizontal mechanical properties of multi-core lead rubber bearings
Huang Yong1,2 Zhang Liang3 Che Zexin1,2 Xin Jianjun4
1. Institute of Engineering Mechanics, China Earthquake Adiministration, Harbin 150080, China; 2. Key Laboratory of Earthquake Engineering and Engineering Vibration, China Earthquake Adiministration, Harbin 150080, China; 3. China State Construction International Investments (Shandong) Ltd., Qingdao 266109,China; 4. Hebei Baoli Engineering Equipment Group Co.,Ltd., Hengshui 053000, China
Abstract：Nowadays, the application of multi-lead core rubber bearing is increasing gradually in China’s building structures. However, the studies of mechanical properties are less. The horizontal unidirectional compressive shear test of multi-lead core rubber support was carried out by using the compression shear test machine firstly, analyzed its unidirectional compressive mechanical properties under uniaxial compressive shear state. To make up for the lack of experimental conditions, a refined finite element model of multi-lead core rubber bearing was established by ABAQUS based on the test sample, had a numerical simulation in the condition of horizontal bidirectional compressive shear. Through the comparison of the mechanical properties of the multi-lead core rubber bearing under horizontal uniaxial and biaxial compression shear state, it is found that there is an obvious two-way coupling effect on the multi-lead core rubber bearing under bidirectional compressive shear, the mechanical properties of the composites were decreased in different degree compared with the one-way action. Finally, by changing the amplitude and frequency of the one loading direction, the influences of the amplitude and frequency of the loading direction on the mechanical properties of the other direction were investigated. It is found that with the increase of the amplitude and frequency of one direction, most of the mechanical properties in the other direction have a tendency to decrease, and the variation tendency of some mechanical properties will be different because of the different loading function. The discovery of these characteristics will be helpful to the reasonable design and layout of the multi-lead rubber bearings, so that they can play a better role in seismic isolation.
