两铰钢结构拱桥大吨位铰支座设计与受力分析

Design and Stress Analysis of Large Tonnage Hinged Support of Two-hinge Steel Structural Arch Bridge

拱铰支座作为两铰拱桥梁的主要承重结构,是拱脚与拱座连接的关键部位,是控制设计的关键环节。由于铰结构的不可更换性,且暴露于空气中,势必会受到水、空气的腐蚀。同时,由于吨位大、应力大,势必存在应力腐蚀。以天保湾大桥的拱铰为例,在国内首次采用5500吨高力黄铜拱铰。拱铰在使用中应传力顺畅,应力分布合理,不出现应力集中现象。针对天保湾大桥拱铰的局部受力进行分析计算,检验其设计的合理性和可行性。

As the main bearing structure of two-hinge arch bridge,the arch hinge support is the key part of connecting the arch foot and abutment,and is the key link of control design.Because the hinge structure cannot be replaceable and is exposed to the air,the hinge structure is bound to be corroded by water and air.At the same time,due to the large tonnage and large stress,there is bound to be stress corrosion.Taking the arch hinge of Tianbaowan Bridge as an example,the 5500-ton high-strength brass arch hinge is used for the first time in China.The arch hinge should be smooth in the force transmission,the stress distribution is reasonable and there is no stress concentration.The local stress of arch hinge of Tianbaowan Bridge is analyzed and calculated to verify the rationality and feasibility of its design.