大跨度预应力混凝土连续梁桥预应力损失对线形的影响

On the Effect of the Pre-Stress Loss of a Large-Span Continuous Reinforced Concrete Girder Bridge on the Linearity of the Bridge

预应力损失是影响桥梁线形的主要因素。为探求大跨度预应力混凝土连续梁桥预应力损失对桥梁线形的影响规律,以广东省佛山市华阳特大桥为依托,运用有限元模拟软件计算出连续梁桥在悬臂施工期间和成桥后的预应力损失对线形的影响,即顶板钢束预应力损失情况是影响桥梁线形的主要因素,并依据对桥梁线形的影响程度提出了顶板、底板、腹板钢筋束的张拉顺序,为后续施工及补强提供科学依据。

The loss of pre-stress is the main factor that affects the linearity of bridges. In order to explore the influential law of the loss of the pre-stress of a long-span continuous pre-stressed concrete girder bridge,and with the Huayang Mega Bridge as the background, the effect of the loss of the pre-stress of a continuous girder bridge on the linearity of the bridge,during the cantilever construction and after the completion of the bridge is calculated with the finite element simulation software. It is found that the loss of the pre-stress of the steel strands of the top slab is the main factor affecting the linearity of the bridge. According to the different degrees of the influence on the linearity of the bridgethe right tensioning order is proposed in the pa-per, namelythey should be pre-stressed in the order of the top slab,the bottom slab and finally the web. The paper may provide scientific grounds for the subsequent construction and the reinforcement.