车桥碰撞仿真分析
利用非线性有限元模拟车－桥碰撞及分析桥梁损伤情况
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点击下载Nonlinear
finite element simulation for the impact between over-high truck and
bridge-superstructure
Proc. 7th Int. Conf. Shock & Impact Loads on Structures,
Oct. 17-19, 2007, Beijing, China, 387-394.
Abstract: According to statistic
data supplied by relative departments, about half of the bridge-superstructures
in Beijing have been impacted by over-high trucks. And over 20% of the
bridge-superstructure failures in Beijing are due to over-high trucks’
impact. Hence it is an important problem that needs to be studied for
the safety of the traffic system. Current researches on the impacts
between vehicles and structures are mostly focused on ship-bridge pier,
car-bridge pier and car-barrier impact. The works on the impact between
over-high truck and bridge-superstructure is lacked. This paper presents
the nonlinear finite element (FE) simulation for the impact between
over-high truck and bridge-superstructure. Besides the nonlinearity
of geometry, material and contact, a more accurate reinforced concrete
model with FE package of MSC.MARC is adopted in the FE model to give
a more realistic simulation for the bridge girders. The whole impact
process is simulated and the damages in truck and bridge-superstructures
are discussed.
Keywords: Bridge, Over-high truck, Impact, Simulation, Nonlinear
摘 要：根据有关统计数据，北京的立交桥半数曾被超高车辆撞击，超高撞击导致的桥梁损坏占已损坏桥梁总数的20％以上。深入研究车－桥碰撞机理，科学评价超高车辆撞击对桥梁的损坏情况，具有重要的现实意义。由于车－桥碰撞试验难度很大，因此计算机仿真分析有着突出的优势。组合结构由于能够充分发挥混凝土和钢材的各自优势，因而在桥梁结构中得到大量应用。但是，组合梁下部的钢板厚度小，因此相比混凝土抗撞能力差。一旦受拉区的钢板被撞坏，整个结构的受力就会产生很不利的变化，从而产生较大的安全问题。因此，超高车辆撞击组合桥梁的仿真分析值得给予关注。本文基于高性能非线性有限元，对超高车辆－组合结构桥梁碰撞进行了高精度仿真分析。仿真分析的结果表明，超高车辆撞击对组合结构桥梁的破坏比较严重，实际应用中需要对组合结构桥梁进行有效的防撞保护。
关键词：组合结构；桥梁；碰撞；非线性；有限元
超高车辆与立交桥梁碰撞的高精度非线性有限元仿真
石家庄铁道学院学报, 20(1), 2007, 29-34.
摘 要：超高车辆和立交桥梁之间的碰撞事故屡见不鲜，深入研究车－桥碰撞机理，为提出车－桥碰撞桥梁损害计算方法奠定基础，具有重要的现实意义。本文基于高性能非线性有限元，对超高车辆－立交桥碰撞进行了高精度仿真分析，并对不同车速导致的桥梁损害情况进行了讨论。分析结果可为深入研究车－桥碰撞问题提供参考。
关键词：碰撞，立交桥，车辆，仿真，非线性
