折线形CFRP束体外预应力使用性能与评价  

PERFORMANCE AND EVALUATION OF EXTERNAL PRESTRESSED CFRP TENDONS WITH A FOLD LINE LAYOUT

作　　者：杨炯[1] 丁汉山[2] 赵凯[3] 杨兆国[4] 

机构地区：[1]上海铁路局,上海200071 [2]东南大学土木工程学院,南京210096 [3]中交公路规划设计院有限公司,北京100088 [4]江苏省交通科学研究院,南京210017

出　　处：《工业建筑》2010年第11期59-64,共6页Industrial Construction

基　　金：江苏省交通科学研究计划项目(03Y028)

摘　　要：对国内首座CFRP体外预应力公路桥梁进行施工监测和荷载试验。试验结果表明:张拉CFRP体外束能有效闭合主梁落架产生的裂缝,改善主梁受力。各荷载试验工况下,CFRP体外索实测索力增量同理论计算值相符,主梁应变呈线性变化,主梁和CFRP体外索表现出良好的协同工作性能。转向块处索体完好,且未出现磨损现象;锚具工作正常,未发现异常;另外索体无支撑长度较短,自由段索体无振动现象。试验表明:采用折线布置方案的CFRP体外预应力束安全可靠。It was conducted the construction monitoring and load test of the national first highway concrete bridge externally prestressed with CFRP tendons,the test results show that concrete cracks can be eliminated or reduced significantly produced at the stage of frames removal,and thus the service behavior of girders are improved due to tension of CFRP tendons.In each test case,girders performed elastically with its strain varying at a linear phase;moreover,the testing force increment of external CFRP tendons was consistent with the theoretical values.All these suggest the concrete girder and external CFRP tendons may serve together in a good pace.In addition,no wear signs and any other defects have been founded at the shift block as well as the anchors.Therefore,all these proved that external prestressed CFRP tendons with a fold line layout can be applied for concrete girders with a good performance.

关 键 词：CFRP束 体外预应力 使用性能与评价 

分 类 号：U441[建筑科学—桥梁与隧道工程]