高阻尼橡胶隔震支座的力学性能及隔震效果研究

对新型高阻尼橡胶隔震支座的力学性能及此支座对桥梁的隔震性能进行了试验研究.通过输入正弦波研究其力学性能,试验结果表明:新型高阻尼橡胶隔震支座是速度相关型支座,加载频率的等效水平刚度有较大的影响,但对其等效阻尼系数影响不大.然而加载经历对新型高阻尼橡胶隔震支座的等效水平刚度与等效阻尼系数均有较大的影响.同时通过速度控制型实时子结构试验精确、定量地验证了新型高阻尼橡胶支座对桥梁的减隔震效果.

Experimental Study on Characteristics and Isolator Effect of High-damping Rubber Bearing

High-damping rubber isolators(HDR) have become to be generally used for bridges as effective devices to enhance the seismic resistance.However,the dynamic characteristics of the HDR have not always been clarified so far because of its scatter nature and the luck of reliable test data.In this study,new type HDR isolators are tested dynamically in several different conditions.As a result,the relationship between the equivalent stiffness,damping constant and number of cyclesis as well as the magnitude of shear strain.The difference by the order of test giving the magnitude of shear strain is also discussed.The real-time substructure hybrid test system which based on velocity loading concept is developed to verify the isolation effects of high-damping rubber.Compared with test results of the nature rubber and high-damping rubber bearing,the best isolation effect of high-damping rubber bearing to the total bridge structural associated with the characteristics of the input seismic ground motion is also directly confirmed.