硝酸腐蚀条件下公路桥梁板式氯丁橡胶支座受压试验

Compression Tests of Plain Chloroprene Rubber Bearings of Highway Bridge under Acid Corrosion Condition

目的研究硝酸腐蚀条件下公路桥梁板式氯丁橡胶支座受压性能的变化规律.方法采用pH=4.5的硝酸溶液对公路桥梁板式氯丁橡胶支座进行20 d、40 d、60 d、80 d、100 d的全浸泡处理,利用5 000 kN的压力试验机进行轴心受压试验,从承载力、极限抗压强度、抗压弹性模量、竖向刚度对腐蚀试件与标准件进行对比分析.结果经硝酸腐蚀后,氯丁橡胶支座的抗压弹性阶段变短,且破坏更加严重;其承载力、极限抗压强度、抗压弹性模量随处理天数的增加而逐渐下降.结论采用最小二乘法对使用0～50年后的橡胶支座的抗压强度和弹性模量进行分析,其衰减函数及衰减曲线大致符合指数函数的变化规律.

This paper studies compression performance change rules of highway bridge slab neoprene bearing under acid corrosion conditions.Do the full immersion treatment of 20 d,40 d,60 d,80 d,100 d on highway bridge slab neoprene bearing using pH=4.5 nitric acid solution,use 5 000 kN pressure tester for axial compression experiments,and compare the corrosion specimen to standard parts form analyzing bearing capacity,ultimate compressive strength,compressive elastic modulus,the vertical stiffness and so on.The experiment results show that the compressive elastic stage of neoprene bearings becomes shorter and the damage is more serious after the acid corrosion;Its bearing capacity,ultimate compressive strength,compressive elastic modulus gradually decline along with the processing days increasing.Analyze compressive strength and elastic modulus of the rubber bearing which are used for 0~50 years by using the least square method,its attenuation formula and decay curve are broadly in line with the changing rule of the exponential function.