冻融条件下公路桥梁四氟滑板氯丁橡胶支座力学性能试验  

Mechanical Tests of Tetrafluoride Skateboard Plain Chloroprene Rubber Bearings of Highway Bridge under Freeze-Thaw Cycle Condition

作　　者：张延年[1] 单春红[1] 郑怡 熊卫士 沈小俊[4] 高飞[4] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省建筑材料监督检验院,辽宁沈阳110032 [3]重庆交通建设(集团)有限责任公司,重庆401147 [4]重庆市公路工程质量检测中心,重庆400060

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第2期282-289,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078065);重庆市科技攻关计划项目(CSTC2011AC6157);辽宁省高等学校杰出青年学者成长计划项目(LJQ2011061);辽宁省教育厅科研项目(LS2010135)

摘　　要：目的研究公路桥梁四氟滑板氯丁橡胶支座经过冻融循环后的承载力变化情况,为各项公路桥梁的施工提供依据.方法将四氟滑板氯丁橡胶支座放入标准冻融试验箱中进行100次的冻融循环处理,而后进行轴心受压及抗剪试验.与标准试件进行对比分析,研究承载力、极限抗压和抗剪强度、竖向刚度、水平等效刚度、弹性模量等各项性能指标的变化.结果四氟滑板氯丁橡胶支座经过冻融循环处理,更易发生脆性破坏,且钢板外露、裂缝等破坏现象较标准试件更为严重.经处理的四氟滑板氯丁橡胶支座的承载力、极限抗压及抗剪强度、抗压及抗剪弹性模量小于标准试件.结论经冻融循环处理,公路桥梁四氟滑板氯丁橡胶支座的各项力学性能指标均明显降低,建议提高四氟滑板氯丁橡胶支座的最低使用温度,严格控制其温度适用范围,在寒冷地区尽量采用天然橡胶支座.In order to provide the basis for the construction of the highway bridge, we study the changes of capacity of the tetrafluoride skateboard plain chloroprene rubber bearings of highway bridge under freezethaw cycle condition. The tetrafluoride skateboard plain chloroprene rubber bearings were processed 100 times by freeze-thaw cycle in the standard freeze-thaw chamber, and then the axial compression and shear tests were carded. Compared with the standard test pieces, studied the changes of the performance indicators in the bearing capacity, the ultimate compressive strength and shear strength, vertical stiffness, horizontal equivalent stiffness, and elastic modulus. The results show that the tetrafluoride skateboard plain chloroprenerubber bearings which after the freeze-thaw cycle were more prone to brittle failure, the steel plate exposed, cracks and other damage phenomenon were more serious than the standard test pieces. The bearing capacity, ultimate compressive strength and shear strength, compressive elastic modulus and shear elastic modulus of the tetrafluoride skateboard plain chloroprene rubber bearings which after the freeze-thaw cycle were less than the standard specimen. The mechanical properties of tetrafluoride skateboard plain chloroprene rubber bearings of highway bridge significantly decreased under freeze-thaw cycle condition, we proposed to increase its minimum applicable temperature, and strictly control its temperature ranges, and use the natural rubber bearings as much as possible in cold regions.

关 键 词：四氟滑板氯丁橡胶支座 冻融循环 轴心受压试验 抗剪试验 承载力 弹性模量 

分 类 号：U443[建筑科学—桥梁与隧道工程]