【摘要】 在对预应力橡胶隔震支座(PRB)进行水平和竖向单调静力加载试验基础上,研究了其竖向刚度和水平刚度等力学性能及变化规律,对适用于计算普通橡胶隔震支座(RB)的竖向刚度公式进行修正,同时提出PRB水平刚度的简化计算方法。此外,通过对PRB进行反复加载试验,研究了其水平滞回耗能性能。研究结果表明,PRB竖向刚度趋于常数,但其计算公式不能沿用适应于RB竖向刚度计算公式;PRB的水平刚度为变刚度,这有利于地震时的水平限位;与RB相比,PRB具有较好的耗能能力。更多还原

【Abstract】 Based on the tests of pre-stressed rubber isolation bearings( PRB) under horizontal and vertical monotonic static loadings,the vertical and horizontal stiffness of PRB and its variation rules were studied. The conventional formula of vertical stiffness for rubber isolation bearings( RB) was revised and the simplified calculation method of horizontal stiffness for PRB was also proposed. Moreover,through the cyclic loading test on PRB,the hysteretic energy dissipation capacity of PRB was studied. The results show that the vertical stiffness of PRB tends to be a constant value,but the calculation formula of RB cannot be applied to PRB. The horizontal stiffness of PRB is variable stiffness,which is conducive to the horizontal displacement limitation under the earthquake. In addition, compared to conventional RB, PRB has a considerable capacity of energy dissipation.更多还原