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以某城市桥梁上部结构遭遇船舶甲板室撞击后T梁断裂为例,利用AASHTO规范公式和通用显式动力分析程序LS-DYNA970计算船舶碰撞力,得到船舶撞击力超过JTG D60-2004《公路桥涵设计通用规范》中所规定的内河航道船舶撞击作用标准值,只要船速超过1 m/s,当水位较高或船舶水上高度超过通航净空高度,最高点超过梁底高程,船舶撞击到桥梁都会对桥梁上部结构造成破坏,导致桥梁T梁断裂事故发生;最后给出更换T梁的桥梁维修方案和桥梁上部结构防撞保护及措施。
Taking the T-beam fracture of an urban bridge superstructure as a result of the impact of the ship deck house as an example, the impact force of the ship is calculated using the AASHTO standard formula and the general explicit dynamic analysis program LS-DYNA970 to obtain the impact force of the ship exceeding that of JTG D60-2004 As long as the ship speed exceeds 1 m / s, when the water level is higher or the watercraft altitude exceeds the navigable headroom and the highest point exceeds the height of the beam bottom, the collision of the ship with the bridge will be correct The damage to the superstructure of the bridge led to the failure of the T-beam of the bridge. Finally, the bridge maintenance program of replacing the T-beam and the anti-collision protection of the superstructure of the bridge were provided.