东营黄河大桥大悬臂状态抗风计算

Wind Resistant Calculation for Large Cantilever of Dongying Yellow River Bridge

研究目的:东红公路东营黄河大桥位于山东省东营市,桥位地处黄河入海口,台风影响明显,因此风对结构的影响是设计需要关注的重点问题之一。通过对结构在自然风的作用下产生的内力、应力、变形及振动,并对桥梁在运营阶段的抗风能力进行分析,为工程抗风采取措施提供依据。研究结论:大跨预应力混凝土薄壁柔性墩刚构桥,处在风口和多遇台风时,风对结构的内力、应力、变形及振动的影响明显,尤其结构在龙卷风风荷载下大跨连续梁临时支墩抗扭强度不足,为此箱梁长悬臂施工力争安排在风速最小的季节内,并尽可能采取措施加强桥梁的横向刚度。

Research purposes：Dongying Yellow River Bridge of Donghong Highway is located at Dongying in Shandong Province,and the bridge site is near the sea entrance of Yellow River with much influence of typhoon.So more attention should be paid to the influence of wind on the structure in design.The analyses of the internal force,stress,deformation and vibration of the bridge structure under the wind effect as well as the wind resistance capacity of the bridge are made for providing the basis for taking measures against wind.Research conclusions：For the large span prestressd concrete frame bridge with thin wall flexible piers,when it locates in the draught and encounters typhoon frequently,the wind much affected the internal force,stress,deformation,vibration of the bridge structure.Especially when encountering tornado,the torsion strength of temporary support pier for the bridge structure is not strong enough.So the large cantilever of bridge should be built in the season with low wind speed,and the necessary measures should be taken to enhance lateral stiffness of the bridge.