系杆断裂对拱桥健康状况的影响
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摘要
通过有限元理论分析,探讨了系杆索断裂前后的拱桥结构内部力学行为的变化规律,进而研究了系杆断裂对整座拱桥健康状况的影响。作为对比,在现场进行了足尺试验,即国内某拱桥因故需要对其系杆更换,在剪断系杆索之际模拟了系杆突然断裂,采用自行研制的光纤光栅测力传感器检测某根系杆剪断前后其他系杆索力的变化情况。根据实测数据与理论分析的对比,验证了理论分析的正确性,为在系杆断裂情况下对拱桥健康状况的诊断提供了一种有效的方法。
The changing rule of interior mechanical behaviors in an arch bridge structure was discussed by the finite element analysis.Then the influence of ties broken on the health state of an arch bridge was researched.As a contrast,the full-scale model test was carried on in the scene.That is,recently,a bridge was needed to replace all its ties in China for some reason.Its tie cables of the bridge being cut off one by one were simulated as being suddenly broken.When a tie cable of the bridge was cut off,the changes of the axial force of the others were tested by the optical fiber grating sensors,which were developed by ourselves.According to the comparison of the measured data with the theoretical analysis ones,the accuracy of the theoretical analysis was confirmed.Thus an effective method was provided to diagnoses the health state of an arch bridge when parts of its ties were broken.
The changing rule of interior mechanical behaviors in an arch bridge structure was discussed by the finite element analysis.Then the influence of ties broken on the health state of an arch bridge was researched.As a contrast,the full-scale model test was carried on in the scene.That is,recently,a bridge was needed to replace all its ties in China for some reason.Its tie cables of the bridge being cut off one by one were simulated as being suddenly broken.When a tie cable of the bridge was cut off,the changes of the axial force of the others were tested by the optical fiber grating sensors,which were developed by ourselves.According to the comparison of the measured data with the theoretical analysis ones,the accuracy of the theoretical analysis was confirmed.Thus an effective method was provided to diagnoses the health state of an arch bridge when parts of its ties were broken.
引文
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[2]符晶华,刘胜春,符蓉,等.武汉晴川大桥结构健康监测系统研究[J].武汉科技大学学报,2006,29:152-154.
[3]梁磊,姜德生,周雪芳,等.光纤Bragg光栅传感器在桥梁工程中的应用[J].光学与光电技术,2003,1(2):36-39.
[4]张启伟.大型桥梁健康监测概念与监测系统设计[J].同济大学学报,2001,29(1):65-69.
[5]黄方林,王学敏.大型桥梁健康监测研究进展[J].中国铁道科学,2005,26(2):1-7.
[6]姜德生,何伟.光纤光栅传感器的应用概况[J].光电子.激光,2002,13(4):400-429.
[7]朱以文.微机有限元前后处理系统Vizi CAD及其应用[M].北京:科学技术文献出版社,1993.
[8]李越松,郑锋勇.Algor软件在高桩码头结构计算中的应用[J].水道港口,2003,24(4):196-199.
[9]张立明.Algor、Ansys在桥梁工程中的应用方法与实例[M].北京:人民交通出版社,2003.
[10]Jiang Desheng,Fu Jinghua,Liu Shengchun,et al.New Optical Fiber Grating Sensor for Force Measurement of Anchor Cable[J].Wuhan University Journal of Natural Sciences,2006,11(3):662-666.
[11]姜德生.智能材料与结构、器件[M].武汉:武汉工业大学出版社,2000.
[12]田石柱,赵雪峰,杨卫东.布拉格光栅传感器在土木工程中的应用[J].世界地震工程,2002,18(3):146-152.
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