摘要
长桩基桥梁受到集中应力撞击时容易产生破坏,影响桥梁结构安全。为进一步研究长桩基桥墩船舶撞击规律,为桥梁防撞设施设计提供参考,以扬州市某跨长江大桥为工程实例,借助三维有限元软件,建立仿真计算模型,系统分析桥墩混凝土强度、船舶撞击位置、配筋率、船舶撞击速度等因素对桥墩受撞后应力应变的影响,并根据大量仿真计算数据,拟合了最大撞击力和上述指标之间的经验公式。研究结果显示:撞击力与桥墩混凝土强度、撞击速度呈线性正相关,与配筋率呈二次曲线正相关;在相同工况下,撞击桥墩对基础影响更小,对上部结构影响更大。
Long pile foundation bridges are prone to damage when they are impacted by concentrated stress,affecting the safety of bridge structure. In order to further research the rules of ship collision of long pile foundation pier,and to provide a reference for bridge anti-collision facilities design,based on the engineering in Yangzhou on a bridge across Yangtze river as an example,with the help of three-dimensional finite element software,the simulation calculation model is established to systematically analyze the influence of such factors as bridge pier concrete strength,ship impact position,reinforcement ratio,ship impact speed,etc. on the stress and strain of the pier after collision,and the empirical formula between the maximum impact force and the above index is fitted based on a large number of simulation calculation data. The results show that the impact force is linearly related to the strength and impact velocity of the pier concrete,and is positively correlated to the reinforcement ratio in quadratic curve. Under the same working conditions,impacting the pier has a smaller influence on the foundation,but has a greater influence on the superstructure.
作者
杨利利
Yang Lili(Shandong Gangtong Engineering Consulting Co.,Ld.,Yantai 264000,Shandong)
出处
《工程建设》
2020年第6期26-33,共8页
Engineering Construction
关键词
长桩基桥梁
最大撞击力
撞击速度
三维有限元分析
long pile foundation bridge
maximum impact force
impact velocity
3D simulation
