桥梁拉索HDPE护套日光老化试验  

Photo-aging test on HDPE sheath of bridge cable

作　　者：张春雷[1] 李国平[1] 雷洛[1,2] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]四川省交通运输厅公路规划勘察设计研究院,成都610041

出　　处：《哈尔滨工业大学学报》2012年第8期91-95,共5页Journal of Harbin Institute of Technology

基　　金：交通部西部交通科技资助项目(2006 318 223 02-01);高等学校博士学科点专项科研基金资助项目(20090072110045)

摘　　要：为了研究生产和使用过程中的初应变对HDPE护套老化的影响,设计了人工日光老化试验和拉伸试验.通过1套铁制夹具对HDPE试片张拉施加初应变;将施加初应变的试片和无初应变的试片放入人工日光老化试验箱进行老化试验;再将老化试验后的试片裁剪、加工成试件进行拉伸试验;分析并比较各组试件的拉伸特性.结果表明,各组试片均未出现明显老化现象,未反映出初应变是HDPE护套开裂的主要原因.建议对试验方法进行完善.To search the influence of initial strain induced in production and service period on HDPE sheath,an artificial photo-aging test and a tensile test were designed.A kind of iron fixture was devised to produce initial strain on HDPE test pieces.The aging tests were conducted on test pieces with and without initial strain in artificial photo-aging test chamber.The tensile tests were undertaken on specimens cut and processed from test pieces after aging test.Comparisons and analysis were made on tensile properties of the specimens.The results show that no obvious aging phenomenon exists in the specimens,it is not appropriate to conclude that the initial strain is the main cause of sheath crack.It is suggested that the test method should be improved.

关 键 词：桥梁工程 HDPE 护套开裂 初应变 日光老化试验 拉伸试验 

分 类 号：U443.48[建筑科学—桥梁与隧道工程]