基于实桥试验的轻型组合桥面动力性能研究

发布时间：2019-05-23 23:34

【摘要】：为了研究薄层超高性能混凝土(UHPC)-钢轻型组合桥面结构的车桥动力性能,依托广东佛陈新桥工程(一幅桥采用轻型组合桥面,另一幅桥采用传统沥青铺装钢桥面)。在钢桥易出现疲劳的位置布置动态应变传感器,进行了大量的跑车动力试验,记录标定车驶过桥面时各测点的时程应变,采用雨流法统计各疲劳细节处的应变幅,汇总试验结果并结合有限元模型,分析了两种钢桥面体系在车辆动力作用下的受力特性。结果表明:轻型组合桥面各测点时程应变的变化规律与传统沥青铺装钢桥面相同;相比于传统钢桥面,轻型组合桥面的车桥动态受力水平较低,其中弧形切口的应变幅降幅最大,达到了23.8%。总体表明:轻型组合桥面未改变传统沥青铺装钢桥面车桥动力受力形式,但能够有效地降低钢桥面的车桥动力响应。
[Abstract]:In order to study the dynamic performance of thin layer ultra-high performance concrete (UHPC)-steel light composite bridge deck structure, relying on the Guangdong Fochen new bridge project (one bridge adopts light composite bridge deck, the other bridge adopts traditional asphalt pavement steel deck). Dynamic strain sensors are arranged in the position where fatigue is easy to occur in steel bridges, a large number of sports car dynamic tests are carried out, the time history strain of each measuring point is recorded when the calibrated vehicle passes through the bridge deck, and the strain amplitude at each fatigue detail is counted by rain flow method. Based on the test results and the finite element model, the mechanical characteristics of two kinds of steel bridge deck systems under the dynamic action of vehicles are analyzed. The results show that the variation law of time history strain at each measuring point of light composite bridge deck is the same as that of traditional asphalt pavement steel bridge deck. Compared with the traditional steel bridge deck, the dynamic stress level of the light composite bridge deck is lower, and the strain amplitude of the arc notch is the largest, reaching 23.8%. The overall results show that the light composite bridge deck does not change the dynamic force form of the traditional asphalt pavement steel bridge deck, but it can effectively reduce the dynamic response of the steel bridge deck.
【作者单位】：湖南大学风工程与桥梁工程湖南省重点实验室;湖南大学土木工程学院;
【分类号】：U443.33

【相似文献】