冻融条件下四氟滑板橡胶支座受压性能研究

发布时间：2018-06-09 06:08

本文选题：四氟滑板橡胶支座 + 冻融循环　；参考：《土木工程学报》2014年S1期

【摘要】：为了研究四氟滑板橡胶支座经过冻融循环后的承载力变化情况,采用标准冻融试验箱对氯丁橡胶支座进行25,50,75,100,150次的冻融循环处理并进行轴心受压试验,研究其在不同冻融循环次数的承载力、极限抗压强度、竖向刚度、弹性模量等各项性能指标的变化,并与标准试件进行对比分析。结果表明经过冻融循环处理的氯丁橡胶支座更容易发生脆性破坏,且钢板外露、裂缝等破坏现象比标准试件更严重。随着冻融循环次数的增加,冻融程度的加深,氯丁橡胶支座极限承载力、极限抗压强度都逐渐降低;采用最小二乘法得出50年抗压强度的衰减曲线和衰减公式,其变化趋势基本符合指数函数规律。冻融循环后的公路桥梁板式氯丁橡胶支座的各项力学性能指标显著降低,因此应严格控制公路桥梁板式氯丁橡胶支座的温度适用范围,并建议提高其最低适用温度,在寒冷地区尽量采用天然橡胶支座。
[Abstract]:In order to study the change of bearing capacity of Tetrafluoroethylene skateboard rubber bearing after freeze-thaw cycle, the standard freeze-thaw test box was used to treat chloroprene rubber bearing for 2550 ~ 75100150 times of freeze-thaw cycle, and the axial compression test was carried out. The change of bearing capacity, ultimate compressive strength, vertical stiffness, elastic modulus and so on in different freeze-thaw cycles were studied and compared with the standard specimens. The results show that the chloroprene rubber bearing treated by freeze-thaw cycle is more prone to brittle failure, and the damage phenomena such as exposed steel plate and crack are more serious than those of the standard specimen. With the increase of freeze-thaw cycle times and the deepening of freeze-thaw degree, the ultimate bearing capacity and ultimate compressive strength of Chloroprene rubber bearings are gradually reduced. Its change trend basically accords with the law of exponential function. After freeze-thaw circulation, the mechanical properties of the plate type Chloroprene rubber bearings of highway bridges are significantly reduced. Therefore, the applicable range of the temperature of the plate type Chloroprene rubber bearings of highway bridges should be strictly controlled, and the minimum applicable temperature should be raised. Use natural rubber bearings as much as possible in cold areas.
【作者单位】：沈阳建筑大学;
【基金】：国家自然科学基金(51078065) 质检公益性行业科研专项项目(201210040) 重庆市自然科学计划项目(CSTC2012jj A30007) 沈阳市科技计划项目(F12-271-4-00)
【分类号】：U443.361

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