摘要
通过对不同表面处理方式的传力杆和对摆放位置存在偏差的传力杆进行拉拔试验,发现不同表面处理方式中喷塑处理可以最大可能性的满足传力杆的设置要求,同时发现传力杆角度的偏差是造成水泥混凝土路面接缝两侧50cm范围内出现裂缝的主要原因;通过弯曲疲劳试验,评价了不同水平安装误差条件下(0°、5°、10°、15°)的接缝传荷能力衰减规律,发现随着传力杆偏差角度的增大,初始接缝传荷能力呈现迅速下降的趋势,并且其整个工作周期内的工作性能发挥也越来越差,当传力杆在水平面内存在不大于5°的角度偏差时,接缝传荷能力可保持在中等水平,对传力杆工作性能不会造成太大影响。最后给出经80万次弯曲疲劳后传力杆的松动量,并提出施工中如何避免传力杆位置偏差的控制措施。
The pull-out test on dowel bar was performed to compare the influence of different treatment methods and deviation of layout on it.It is found that the dowel bar sprayed by plastic can better meet the demand of setting the dowel bar in transverse joints of the concrete pavement,and the reason for cracks appeared in 50 cm range of the joints is the deflection of the dowel bar.Then the bending fatigue test was performed to valuate the degradation regularity of the load transfer capacity of the joints with different horizontal installation errors（0°,5°,10° and 15°）.It is found that（1） the initial load transfer capacity reduces quickly with the dowel bar＇s layout deviation angle increases,and the load transfer capacity becomes worse and worse in the working cycles;（2） when the dowel bar＇s layout deviation angle is no more than 5°,the dowel bar＇s working performance is not affected and may be kept at the middle level.Finally,the looseness of dowel bar under the repeated bending test with 800,000 cycles was given,and the technical control measures for avoidance of the position deviation were suggested.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第6期62-66,108,共6页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技项目(200731822301-9)
关键词
道路工程
接缝传荷系数
弯曲疲劳
传力杆
松动量
road engineering
load transfer coefficient
bending fatigue
dowel bar
looseness
