摘要
针对装配式空心板梁桥铰缝的破损评价,提出相对位移法,通过测量在正常通行荷载作用下一段时间内铰缝的最大相对位移值,判断铰缝的破损程度。设计了测量相对位移的装置,给出了相应的测试方法。通过对9座桥梁259条铰缝的实测结果统计分析发现:仅通过外观检查判定铰缝损伤状态并不可靠;相对位移与铰缝的损伤程度有较强的相关关系;通过相对位移来区分铰缝不同的状态是合理的;使用无量纲参数a可将铰缝划分为完好、损坏和破坏3种状态,3者之间的界限值分别为0.14和0.57。对一座实桥的荷载试验结果表明,采用相对位移判断铰缝损伤状态所得到的结论与通过荷载试验所得结论一致,采用相对位移法判断铰缝的破损程度不仅方便,而且可靠。
In order to evaluate the deterioration of hinge joint in fabricated hollow slab beam bridge, the relative displacement method was proposed to evaluate the deterioration of hinge joint by measuring the largest relative displacement of the hinge joint in a period of time under the action of normal traffic load. The apparatus for measuring the relative displacement was designed and the corresponding testing method was also given. The statistical analysis on the results from the measuring of 259 hinge joints in 9 bridges shows that （ 1 ） it is unreliable to judge the damage status of hinge joints only through visual inspection; （2） there exists a high correlation between relative displacement and damage status of hinge joints; （3） it is rational to distinguish different status of hinge joints through relative displacement ; （4） the status of hinge joints can be classified into regimes of completeness, damage and fracture according to the value of dimensionless parameter a, whose boundaries are 0. 14 and 0.25 respectively. The result from an in-situ load test on a bridge shows that the status of hinge joints obtained from relative displacement method is in agreement with , the presented relative displacement method is not only convenient, but also
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第7期76-81,共6页
Journal of Highway and Transportation Research and Development
基金
上海市城乡建设与交通委员会科研项目(建管2011-009-001)
关键词
桥梁工程
空心板梁桥
相对位移法
现场试验
铰缝
损坏
bridge engineering
hollow slab beam bridge
relative displacement method
in-situ test
hinge joint
damage
