热老化条件下公路桥梁板式氯丁橡胶支座受压试验

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热老化条件下的各项力学性能指标变化，将氯丁橡胶支座在高温试验箱中进行热老化处理20、40、60、80d，并采用压力试验机对其进行轴心受压试验。研究热老化对氯丁橡胶支座的承载力、极限抗压强度、竖向刚度、抗压弹性模量的影响。试验结果表明，在热老化条件下，氯丁橡胶支座更易发生脆性破坏，弹性阶段缩短，发生钢板外露、裂缝、层状破坏等现象更严重；承载力、极限抗压强度、竖向刚度、抗压弹性模量随热老化程度的加深而逐渐降低；采用最小二乘法对50年抗压强度及抗压弹性模量进行分析，衰减函数和衰减曲线基本符合幂函数变化规律。

Compression Tests of Plain Chloroprene Rubber Bearings of Highway Bridge Under Thermal Aging Condition

The impact of climate is more serious to highway bridge rubber bearings than building rubber bearings, in order to study the change of the mechanical properties of the plain chloroprene rubber bearings of highway bridge in the conditions of the summer high temperature, the plain chloroprene rubber bearings are processed 20, 40, 60, 80 days in the high-temperature chamber, then the axial compression tests are carried by pressure testing machine, then compared with the standard test pieces, and then studying the impact of thermal aging in carrying capacity, ultimate compressive strength, vertical stiffness, elastic modulus of compression. The results show that, the plain chloroprene rubber bearings more prone to brittle failure under thermal aging, and the elastic stage is shortened, the exposure of plate exposure, cracks, and layered damage phenomenon are more serious. The carrying capacities, ultimate compressive strength, vertical stiffness, elastic modulus of compression are decreased with increase of degree of thermal aging. The attenuation formula and decay curve in 50 years of ultimate compressive strength and elastic modulus of compression are analyzed by least square method, and decay trends ultimate compressive strength and elastic modulus of compression are approximately according with power function.