疲劳与长期自然暴露后的复材空心桥面板受力性能

PERFORMANCE OF FRP HOLLOW BRIDGE DECK AFTER FATIGUE LOADING AND NATURAL AGING

研究了由内部缠绕芯管、面层拉挤平板和外部缠绕组成的高性能复材空心桥面板的长期性能。对同一构件依次进行了200万次的疲劳试验加载和10年的自然暴露,之后进行了四点弯曲静载试验和中心点加载破坏试验。通过四点弯曲静载试验获得老化后试件的抗弯和抗剪刚度,在加载过程中构件始终保持线弹性,构件的整体受力性能良好,组件间无错动或剥离现象。中心点加载试验模拟了车轮集中荷载,测定了集中荷载下的破坏模式和极限荷载。中心点加载的极限荷载为764. 57k N,破坏模式为加载点处的冲切破坏。研究表明,复合材料桥面板的长期受力性能能够满足工程应用的需求,并具有较好的耐久性。

This paper presents results from an experimental study of an innovative Glass Fiber Reinforced Polymer(GFRP)bridge deck composed of GFRP pultruded panels,GFRP filament-wound square core-tubes,and Outside Filament-wound Reinforcement(OFR).One specimen was tested by four-point bending test and point load test after fatigue loading for 2000000 times and natural aging for 10 years.Bending stiffness and shear stiffness were analyzed in four-bending test.Point load test simulated vehicle load.Failure mode and ultimate strength were tested in point load test.Specimen was not damaged in four point bending test,during which it remained intact and elastic.Ultimate strength of point load test was 764.57 kN.The failure mode was punching damage near load point.The test results revealed that the long-term performance of GFRP bridge deck was able to satisfy the engineering requirement.Furthermore,GFRP bridge deck had excellent durability.