冻融条件下四氟滑板橡胶支座受压性能研究
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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。
In order to study the change of the mechanical properties during the life of the PTFE slide rubber bearings under freeze-thaw cycle condition, the plain chloroprene rubber bearings were processed 25, 50, 75, 100 and 150 times by freeze-thaw cycle in the standard freeze-thaw chamber, then the axial compression tests were carried. The changes of the performance indicators in the bearing capacity, the ultimate compressive strength, and vertical stiffness under different freeze-thaw cycles were analyzed comparatively. The results show that the PTFE slide rubber bearings more prone to brittle failure which after the freeze-thaw cycle, and the steel plate exposing, cracks and other damage phenomena are more serious than the standard specimen. With the increasing in the number of freeze-thaw cycle, the ultimate bearing capacity and ultimate compressive strength of the PTFE slide rubber bearings decrease. The attenuation formula and decay curve in 50 years of ultimate compressive strength is analyzed by least square method. The trend of change is in line with the exponential function. The mechanical properties of PTFE slide rubber bearings significantly decreased under freeze-thaw cycle condition. Therefore, the temperature ranges of PTFE slide rubber bearings should be controlled strictly; its minimum applicable temperature should be proposed to increase, and the natural rubber bearings should be used as much as possible in cold regions.
In order to study the change of the mechanical properties during the life of the PTFE slide rubber bearings under freeze-thaw cycle condition, the plain chloroprene rubber bearings were processed 25, 50, 75, 100 and 150 times by freeze-thaw cycle in the standard freeze-thaw chamber, then the axial compression tests were carried. The changes of the performance indicators in the bearing capacity, the ultimate compressive strength, and vertical stiffness under different freeze-thaw cycles were analyzed comparatively. The results show that the PTFE slide rubber bearings more prone to brittle failure which after the freeze-thaw cycle, and the steel plate exposing, cracks and other damage phenomena are more serious than the standard specimen. With the increasing in the number of freeze-thaw cycle, the ultimate bearing capacity and ultimate compressive strength of the PTFE slide rubber bearings decrease. The attenuation formula and decay curve in 50 years of ultimate compressive strength is analyzed by least square method. The trend of change is in line with the exponential function. The mechanical properties of PTFE slide rubber bearings significantly decreased under freeze-thaw cycle condition. Therefore, the temperature ranges of PTFE slide rubber bearings should be controlled strictly; its minimum applicable temperature should be proposed to increase, and the natural rubber bearings should be used as much as possible in cold regions.
引文
[1]范立础,袁万城.桥梁橡胶支座减、隔震性能研究[J].同济大学学报,1989,17(4):447-456(Fan Lichu,Yuan Wancheng.Seismic isolation an energy absorption properties of elastomeric pad bearing for bridges[J].Journal of Tongji University,1989,17(4):447-456(in Chinese))
[2]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35(Fan Lichu,Nie Liying,Li Jianzhong.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journal of Highway and Transport,2003,16(4):30-35(in Chinese))
[3]王常峰,陈兴冲,朱东生.活动支座摩擦力对桥梁抗震性能的影响参数分析[J].世界地震工程,2005,21(4):82-87(Wang Changfeng,Chen Xingchong,Zhu Dongsheng.Analysis on the influence of the friction force at the movable supports on the seismic performance of a bridge[J].world Earthquake Engineering,2005,21(4):82-87(in Chinese))
[4]Itoh Y,Gu H S.Prediction of aging characteristics in natural rubber bearings used in bridges[J].Journal of Bridge Engineering,2009,14(2):122-128
[5]Takaoka1 E,Takenaka Y,Nimura A.Shaking table test and analysis method on ultimate behavior of slender baseisolated structure supported by laminated rubber bearings[J].Earthquake Engineering&Structural Dynamics,2011,40(5):551-570
[6]Kalpakidis I V,Constantinou M C.Effects of heating on the behavior of lead-rubber bearings.I:theory[J].Journal of Structural Engineering,2009,135(12):1440-1449
[7]Gu H S,Itoh Y.Ageing behaviour of natural rubber and high damping rubber materials used in bridge rubber bearings[J].Advances in Structural Engineering.2010,13(6):1105-1113
[8]顾浩声,伊藤羲人.天然橡胶隔震支座的内部老化特性及预测方法[J].北京工业大学学报,2012,38(2):186-193(Gu H S,Itoh Y.Aging inside natural rubber bearings and prediction method[J].Journal of Beijing University of Technology,2012,38(2):186-193(in Chinese))
[9]Gu H S,Itoh Y.Aging behaviors of natural rubber in isolation bearings[J].Advanced Materials Research,2011,163:3343-3347
[10]李慧,邓学晶,杜永峰,等.寒区叠层橡胶隔震支座拟静力试验研究[J].低温建筑技术,2003,(4):33-35(Li Hui,Deng Xuejing,Du Yongfeng,et al.Pseudo-static experimental study of rubber isolator under low temperature[J].Low Temperature Architecture Techniques,2003,(4):33-35(in Chinese))
[11]GJB1172.11—91军用设备气候极值地表温度、冻土深度和冻融循环日数[S].北京:中国标准出版社,1991(GJB1172.11—91 Climatic extremes for military equipment--Ground surface temperature,depth of frozen soil,number of freezing and thawing cycle days[S].Beijing:China Standards Press,1991(in Chinese))
[12]GB/T20688.1—2007橡胶支座:第1部分:隔震橡胶支座试验方法[S].北京:中国标准出版社,2007(GB/T20688.1—2007 Rubber bearings-Part1:S eismic-protection isolators test methods[S].Beijing:China Standards Press,2007(in Chinese))
[2]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35(Fan Lichu,Nie Liying,Li Jianzhong.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journal of Highway and Transport,2003,16(4):30-35(in Chinese))
[3]王常峰,陈兴冲,朱东生.活动支座摩擦力对桥梁抗震性能的影响参数分析[J].世界地震工程,2005,21(4):82-87(Wang Changfeng,Chen Xingchong,Zhu Dongsheng.Analysis on the influence of the friction force at the movable supports on the seismic performance of a bridge[J].world Earthquake Engineering,2005,21(4):82-87(in Chinese))
[4]Itoh Y,Gu H S.Prediction of aging characteristics in natural rubber bearings used in bridges[J].Journal of Bridge Engineering,2009,14(2):122-128
[5]Takaoka1 E,Takenaka Y,Nimura A.Shaking table test and analysis method on ultimate behavior of slender baseisolated structure supported by laminated rubber bearings[J].Earthquake Engineering&Structural Dynamics,2011,40(5):551-570
[6]Kalpakidis I V,Constantinou M C.Effects of heating on the behavior of lead-rubber bearings.I:theory[J].Journal of Structural Engineering,2009,135(12):1440-1449
[7]Gu H S,Itoh Y.Ageing behaviour of natural rubber and high damping rubber materials used in bridge rubber bearings[J].Advances in Structural Engineering.2010,13(6):1105-1113
[8]顾浩声,伊藤羲人.天然橡胶隔震支座的内部老化特性及预测方法[J].北京工业大学学报,2012,38(2):186-193(Gu H S,Itoh Y.Aging inside natural rubber bearings and prediction method[J].Journal of Beijing University of Technology,2012,38(2):186-193(in Chinese))
[9]Gu H S,Itoh Y.Aging behaviors of natural rubber in isolation bearings[J].Advanced Materials Research,2011,163:3343-3347
[10]李慧,邓学晶,杜永峰,等.寒区叠层橡胶隔震支座拟静力试验研究[J].低温建筑技术,2003,(4):33-35(Li Hui,Deng Xuejing,Du Yongfeng,et al.Pseudo-static experimental study of rubber isolator under low temperature[J].Low Temperature Architecture Techniques,2003,(4):33-35(in Chinese))
[11]GJB1172.11—91军用设备气候极值地表温度、冻土深度和冻融循环日数[S].北京:中国标准出版社,1991(GJB1172.11—91 Climatic extremes for military equipment--Ground surface temperature,depth of frozen soil,number of freezing and thawing cycle days[S].Beijing:China Standards Press,1991(in Chinese))
[12]GB/T20688.1—2007橡胶支座:第1部分:隔震橡胶支座试验方法[S].北京:中国标准出版社,2007(GB/T20688.1—2007 Rubber bearings-Part1:S eismic-protection isolators test methods[S].Beijing:China Standards Press,2007(in Chinese))
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