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大量高速公路需要通过拼宽改造以适应不断增加的交通量。该文以京港澳高速公路上某4×16m预应力混凝土空心板桥的拓宽改造工程为依托,首先通过比较现有空心板桥拼接模式,选择合适的拼接方案,然后利用桥梁分析软件Midas/Civil建立空间梁格模型,讨论不同收缩徐变模式、不同拼接时间、不同新桥沉降量对拼接纵缝的影响,分析结果表明:收缩徐变模式对纵缝应力计算结果影响较大但趋势基本一致,延长新桥空心板的存梁时间可有效降低因收缩徐变产生的应力;桥墩沉降可能导致纵缝开裂,拼宽设计时应适当增大桩长、桩径,以控制新建桥梁的总的沉降量,综合考虑收缩徐变及沉降等的影响对组合作用下接缝的裂缝宽度进行了验算,并对接缝位置配筋进行了设计。
A large number of highways need to be rebuilt to meet the ever-increasing volume of traffic. Based on the widening and reconstruction project of a 4 × 16m prestressed concrete hollow slab bridge on Beijing-Hong Kong-Macau Expressway, this paper first selects the appropriate splice scheme by comparing with the existing hollow slab-bridge splice pattern and then uses the bridge analysis software Midas / Civil The space girder model is established to discuss the effect of different shrinkage and creep modes, different splicing time and different bridge settlement on the splicing longitudinal seam. The results show that the shrinkage and creep mode has a great influence on the longitudinal stress calculation but the trend is basically the same , Lengthening the storage time of the hollow slab of Xinqiao can effectively reduce the stress caused by the shrinkage and creep. The settlement of the pier may lead to the cracking of the longitudinal seam, and the pile length and pile diameter should be appropriately increased in designing the width of the bridge to control the total The settlement, considering the influence of shrinkage and creep, settlement and so on, the crack width of the joint under the combined action was checked, and the reinforcement of the joint location was designed.