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对7块钢板-轻骨料混凝土空心组合桥面板和2块钢板-普通混凝土空心组合桥面板进行了疲劳试验研究,主要考察了疲劳荷载作用下组合板中钢管的布置形式、疲劳荷载幅值、疲劳荷载上下限、疲劳加载次数及混凝土材料特性5个关键因素对空心组合桥面板疲劳破坏形态、疲劳刚度退化、疲劳动力响应及疲劳强度等疲劳性能的影响。结果表明:2种钢管布置形式的空心组合桥面板的疲劳破坏形态都是底部钢板发生疲劳断裂导致整体失效破坏;组合桥面板疲劳循坏加载次数主要由疲劳荷载幅值控制,与疲劳荷载上限关系不明显;钢板-普通混凝土组合桥面板疲劳性能优于钢板-轻骨料混凝土组合桥面板;组合桥面板疲劳破坏主要是由于底部钢板疲劳断裂破坏所致,在组合桥面板中未发现组合桥面板组合作用的明显疲劳破坏现象;组合桥面板疲劳寿命计算主要为底部钢板疲劳强度计算,可以采用基于疲劳荷载幅值方法所建立的钢结构疲劳寿命理论进行计算。
The fatigue tests of seven steel plates - lightweight aggregate concrete hollow composite bridge deck and two steel plates - common concrete hollow composite bridge deck panels were carried out. The main conclusions are as follows: the arrangement form of steel pipe, fatigue load amplitude, The upper and lower limits of fatigue load, the number of fatigue loading and the properties of concrete materials on the fatigue properties of hollow composite decks such as fatigue failure mode, fatigue stiffness degradation, fatigue dynamic response and fatigue strength. The results show that the fatigue failure modes of the hollow composite bridge deck with two types of steel pipe layouts are caused by the fatigue failure of the bottom plate, which leads to the failure of the whole plate. The fatigue cycles under load are mainly controlled by the fatigue load amplitude and the upper limit of fatigue load The fatigue performance of the steel plate-ordinary concrete composite deck is better than that of the steel plate-lightweight aggregate concrete composite deck; the fatigue failure of the composite deck is mainly caused by the fatigue failure of the bottom steel plate, and no composite bridge deck is found in the composite deck The fatigue life of composite bridge deck is mainly calculated on the basis of the fatigue strength of the bottom steel plate, which can be calculated by using the fatigue life theory of steel structure based on fatigue load amplitude method.