东江特大桥主桥为(95+170+95)m的连续刚构桥,为判断该桥下部构造是否满足规范抗撞要求,对桥墩进行抗撞分析.采用有限元程序MIDAS建立全桥及桥墩模型,通过反复试算,得出主墩、交界墩和引桥桥墩能够承受的最大船撞力横桥向分别为14 MN、5 MN、3 MN,顺桥向分别为10 MN、4 MN、3.5 MN,与国内<公桥规>、<铁桥规>及美国AASHTO 3种规范计算出的设计船撞力进行比较,结果表明各桥墩均能满足国内两规范对桥梁的抗撞要求.为防止船舶直接撞到桥墩,采取设置橡胶块、防撞岛、防撞墙及将交界墩的左、右幅承台连为整体的防撞措施.%The main bridge of Dongjiang River Bridge is a continuous rigid-frame bridge having span arrangement (95+l70+95) m. To identify if the substructure of the bridge can conform to the relevant collision resistance requirements in the codes, the collision resistance of the piers is analyzed. The models of the whole bridge and the piers are established by the finite element program MIDAS, the corresponding calculation has been repeatedly made and it is obtained from the calculation that the maximum ship collision force that the main piers, side piers and the approach bridge piers can sustain in the transverse direction of the bridge are respectively 14 MN, 5 MN and 3 MN while in the longitudinal direction, are respectively 10 MN, 4 MN and 3.5 MN.The calculation is then compared to the designed ship collision forces calculated according to the 3 types of the Chinese General Code for Design of Highway Bridges and Culverts, Chinese Fundamental Code for Design on Railway Bridge and Culvert and AASHTO and the comparison proves that all piers of the bridge can meet the ship collision resistance requirements set for bridges in the two types of the domestic codes. However, to prevent ships from directly colliding against the piers, the collision resistance measures, including setting of the rubber blocks, collision islands, collision walls and connection of the left and right parts of a pier base of the side piers into an integrity, have been taken.
展开▼
