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公路桥梁橡胶支座比建筑橡胶支座更容易受到气候的影响,为了研究公路桥梁板式氯丁橡胶支座在受到气候影响时的各项抗剪性能指标变化情况,采用标准冻融试验箱模拟低温气候变化,对氯丁橡胶支座进行冻融循环处理25、50、75、100次,并对其进行抗剪试验,采用与标准试件进行对比分析的方法,研究冻融循环对氯丁橡胶支座的抗剪承载力、抗剪强度、水平等效刚度、抗剪弹性模量的影响。结果表明,氯丁橡胶支座在冻融循环处理条件下比标准试件更易发生破坏,且钢板外露、裂缝等破坏现象更严重。氯丁橡胶支座的抗剪承载力、抗剪强度、水平等效刚度、抗剪弹性模量都随冻融程度的加深而降低。采用最小二乘法对其抗剪强度和抗剪弹性模量变化进行分析并给出衰减曲线和衰减函数,抗剪强度和抗剪弹性模量的变化趋势基本符合幂函数规律。
In order to study the change of various shear resistance indexes of highway bridge plate-type neoprene bearing when subjected to the influence of climate, the highway bridge rubber bearing is more susceptible to the influence of climate than the construction rubber bearing. The standard freezing-thawing test chamber is used to simulate the low temperature Climatic change, the neoprene bearing was subjected to freeze-thaw cycles for 25, 50, 75 and 100 times, and then subjected to shearing test. By comparison with standard test pieces, the effects of freeze-thaw cycles on neoprene Shear bearing capacity, shear strength, horizontal equivalent stiffness, shear modulus of elasticity. The results show that the neoprene bearing is more prone to damage than the standard specimen under the freeze-thaw cycles, and the damage of the exposed steel plate and cracks is more serious. The shear bearing capacity, shear strength, horizontal equivalent stiffness and shear modulus of neoprene bearing all decrease with the degree of freezing and thawing. The least square method was used to analyze the change of shear strength and shear modulus, and the decay curve and attenuation function were given. The change trend of shear strength and shear modulus basically accorded with the law of power function.