厚层铅芯橡胶支座力学性能

设计了3种不同单层橡胶厚度的厚层铅芯橡胶支座并进行力学性能试验,研究其竖向压缩刚度、水平等效刚度、屈服后刚度、屈服力、等效阻尼比等基本力学性能,分析其随压应力、剪应变等的变化规律,并与现有的力学性能理论值进行比较.结果表明,竖向刚度试验值和理论值相差较大,且随着单层橡胶厚度的增大而增大;针对竖向刚度试验提出了拟合公式,该公式与试验结果吻合较好;受样本数量的限制,拟合公式的适用性有待进一步验证;厚层铅芯橡胶支座的水平力学性能与理论值较接近.

Mechanical Properties of Thick Lead Rubber Bearings

Three kinds of thick lead rubber bearings(TLRB) with different thicknesses of rubbers were designed in this paper. The basic mechanical properties of the TLRB were studied through mechanical properties test, such as vertical stiffness, equivalent horizontal stiffness, post yield stiffness, yield shear force, and equivalent damping ratio. The effects of pressure stress and shear strain on mechanical properties of TLRB were studied. The comparison of mechanical properties between test and formula were analyzed. It is concluded that the difference of vertical stiffness of TLRB between test and formula is apparent and the difference is increasing as the thickness of rubber increases. The fitting formula of vertical stiffness about test was given, and the effect of fitting was satisfying. Because of the limit of samples, the applicability of the fitting formula should be checked in future work. The test value of horizontal properties of TLRB are similar to the formula value.