低硬度橡胶隔震支座各种相关性及老化徐变特性

作者系统地对低硬度橡胶隔震支座的材料和力学性能进行了试验研究。研究使用的低硬度橡胶隔震支座分18种规格，总计近30个大直径隔震支座。研究内容涉及低硬度橡胶隔震支座的基本力学性能；温度、压力、剪切变形、老化和徐变等相关性；压缩界限，屈曲及极限剪切变形等界限性能以及橡胶材料性能和隔震工程应用等方面。本文主要介绍低硬度橡胶隔震支座的压力、剪切变形、温度对支座刚度、阻尼等力学性能的影响，同时还对隔震支座的老化及徐变特性进行了试验研究，确定低硬度橡胶使用60年后的力学性能变化率。文中同时提出了低硬度橡胶支座的温度修正方程，并提出了隔震结构地震反应分析时支座刚度和屈服荷载变化的取值范围。

Various dependence and duration properties of low stiffness rubber bearings

The material properties and mechanics properties of low stiffness rubber bearings are systemically performed both in test and in theory in our research. There are two types of low stiffness rubber bearings, natural rubber bearings (NRB) and lead plug rubber bearings (LPRB), total 18 specifications and 30 large diameter specimens are tested for grasping various properties. The characteristics of low stiffness rubber bearings include fundamental properties such as vertical stiffness, horizontal stiffness and damping; extreme properties such as buckling, extreme compressive stress and maximum shear strain; various dependence such as compressive stress, shear strain and temperature; duration properties of aging and creeping. In this paper, various dependence of compressive stress, shear strain and temperature are studied for both NRB and LPRB, and aging, creep are tested too to grasp the properties of low stiffness rubber bearings. A modified formula for temperature and a modified stiffness and yield load table are provided in the end of the paper for analyzing the earthquake response.