钢—混凝土组合梁桥的受力性能受到混凝土桥面板时间效应的影响 ,该影响会改变此类结构的耐久性。目前 ,就组合桥中混凝土板横向开裂问题进行了详细的研究 ,有助于更好地理解混凝土板产生拉应力的原因。现场测试与实验室试验均可以从混凝土板浇注之时开始观测混凝土板的受力行为。其结果表明 :混凝土水化作用以及浇注顺序对混凝土板中拉应力有很大的影响 ,这表明对大多数典型桥梁 ,混凝土板是在施工阶段达到最危险拉应力。对限制水化作用的方法进行试验 ,并将结果与数值模拟进行了比较 ,根据这些模拟建立了评估早期混凝土开裂模式的概率准则 The mechanical behavior of steel-concrete composite beam bridges is affected by the time effect of concrete bridge deck, which will change the durability of such structures. At present, the problem of transverse cracking of concrete slabs in composite bridges has been studied in detail, which helps to better understand the causes of tensile stress in concrete slabs. Field test and laboratory test can be observed from the beginning of the concrete slab pouring concrete slab behavior. The results show that concrete hydration and pouring sequence have a significant effect on tensile stress in concrete slabs, indicating that for most typical bridges, concrete slabs reach the most critical tensile stress during the construction phase. The method of limiting hydration was tested and the results were compared with numerical simulations. Based on these simulations, a probability criterion for evaluating early cracking modes of concrete was established