实桥加载下钢桥面超高性能混凝土铺装力学响应

Mechanical Response of Ultra-high Performance Concrete Pavement for Steel Bridge Deck Under Real Bridge Loading

为获取钢桥面超高性能混凝土铺装真实力学响应情况,对上海市同济路钢桥进行现场加载试验,分析铺装层在静载、动载以及运营期下的应变响应特征。结果表明,静载下铺装层最大拉应变在U型肋侧边上方铺装层顶,纵向距横隔板0.25 m处,方向为横向,值为25.1×10^-6;动载下铺装层的动态响应特征与钢桥沥青铺装的特征不同,超高性能混凝土铺装仅拉应变随加载速度增加而减小,且应变动态响应曲线具有3种波形,并随速度增加呈现3类变化特征;运营期铺装层拉应变极值明显大于静载结果,但动态响应特征与动载结果一致。

In order to obtain the true mechanical response of UHPC(ultra-high performance concrete)pavement of steel bridge deck,a field loading test was carried out on Tongji Road steel bridge in Shanghai.The strain response characteristics of pavement under static load,dynamic load and in operation period were analyzed.Results show that the maximum tensile strain area of the pavement layer is on the top of the pavement layer which is above the U-shaped rib side,and 0.25 m from the diaphragm plate longitudinally.The direction of the maximum tensile strain,with a value of 25.1×10^-6,is transverse.The dynamic response characteristics of UHPC pavement under dynamic load are different from those of steel bridge asphalt pavement.The tensile strain value of UHPC pavement only decreases with the increase of loading speed.And the dynamic response curve of strain has three kinds of waveforms,and shows three kinds of changing characteristics with the increase of velocity.During operation period,the extreme value of the tensile strain of UHPC pavement is obviously larger than that of static load,but the dynamic response characteristics are consistent with those of dynamic load.