基于一种新型铅芯橡胶隔震支座的力学参数试验研究

EXPERIMENTAL STUDY OF MECHANICAL PARAMETERS OF A NEW TYPE OF LEAD-RUBBER BEARING BY FOR NONLINEAR DYNAMIC ANALYSIS

通过对不同结构构造的铅芯橡胶支座进行水平动态力学试验,系统研究了铅芯橡胶支座动态力学性能与其结构构造及外加动载之间的关系。在支座直径、橡胶和薄钢板厚度不变的情况下,分析了不同倾角或曲率的铅芯橡胶隔震支座在竖向荷载和剪切荷载作用下的力学性能;研究了竖向刚度、水平等效刚度、屈服后刚度、屈服力、等效阻尼比等的变化规律。研究结果表明,竖向刚度随倾角或曲率的增加呈减小趋势,水平等效刚度、屈服后刚度、屈服力、等效阻尼比随倾角或曲率的增加呈增大趋势;同时通过数值分析精确的验证了新型铅芯橡胶支座具有良好的减隔震效果。

Horizontal dynamic tests on lead-rubber bearings were conducted. The relations among the mechanical properties, the structural dimensions and the dynamic load applied on the lead-rubber bearing are identified. Under the condition that the diameter of the support and the thickness of the rub- ber and the thin steel plate remain unchanged with different angles or curvatures under vertic , the mechanical performance of the lead rubber bearing al load and shear load is analyzed. Effects of diameters of LRBs on vertical stiffness, equivalent horizontal stiffness, post-yield stiffness, yield shear force and equivalent damping ratio were studied. It is concluded that vertical stiffness decreases with the increase of inclination or curvature, equivalent horizontal stiffness, post-yield stiffness, yield shear force and equivalent damping ratio increases with the increase of inclination or curvature. through numerical analysis that the new lead-rubber bearing has good seismic Meanwhile, it is verified isolation effect.