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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。
In order to study the dynamic performance of ultra-high performance concrete (UHPC) -diameter bridge with light weight composite decks, based on the project of Foshan Fushenxin Bridge (one light bridge deck, another bridge with traditional asphalt pavement steel bridge surface). A dynamic strain sensor was arranged in the position where steel bridge was prone to fatigue. A large number of sports car dynamic tests were carried out. The time-history strain at each measuring point of the bridge was recorded and the strain amplitude at each fatigue detail was calculated by rain flow method. The test results are summarized and combined with the finite element model to analyze the stress characteristics of two kinds of steel bridge deck system under the vehicle motive force. The results show that the variation of the time-dependent strain at each measuring point is the same as that of the traditional asphalt pavement steel. Compared with the traditional steel deck, the dynamic stress level of the light-weight composite deck is lower, Shaped incision strain amplitude decline the largest, reaching 23.8%. Overall, it shows that the light composite deck does not change the dynamic stress form of traditional asphalt pavement steel bridge deck, but it can effectively reduce the dynamic response of the bridge deck.