浅埋式桩基础钢筋混凝土拱桥桥墩防撞安全性评价与加固技术研究

Pier anti-collision safety evaluation of reinforced concrete arch bridge with shallow-buried piles and its strengthening technology research

以五强溪沅水大桥为工程背景,针对浅埋式桩基础钢筋混凝土拱桥,提出基于我国公路桥涵设计规范桥墩防撞安全性评价方法。通过对该桥的桥墩防撞安全性评价提出了相应的桥墩加固方案。采用三维实体单元来模拟基础加固后新老混凝土的共同作用,同时考虑新老混凝土接触面按完全粘结与滑动2种情况建立计算模型,对桥墩防撞加固方案的可行性进行了研究,亦可供同类桥梁加固参考。

On the background of Yuan River bridge in Wuqiangxi, a method of pier anti - cillision safety evalua-tion, based on ＂Highway Bridge Code for Design＂, was put forward for reinforced concrete arch bridge with shal-lao-buried piles. On the basis of safety evaluation of Yuan River Bridge pier, a pier strengthening project of Yuan River Bridge in Wuqiangxi was proposed. In order to simulate the interaction of new and old concrete after strengthening of foundation, three - dimensional solid elements were adopted, where two situations of the inter-face between new and old concrete,i, e. , fully bonded or sliding were taken into account. The feasibility of this pier reinforcement project was studied, which can also provide reference for the similar bridge strengthening engi-neering.