Impact Analysis of Single Slope Concrete Barrier
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摘要: 为了解某单坡面混凝土护栏防撞能力和防护机理,运用有限元仿真方法和试验方法进行碰撞分析,结果证明,该单坡面混凝土护栏能防护速度为80 km/h的14 t大客车以20°的碰撞,各项指标满足防撞性能指标要求,具有400 kJ防撞能力;通过使车辆爬升和倾斜来吸收车辆动能和增加碰撞缓冲时间是单坡面混凝土护栏有效防护的一个重要机理;仿真结果和试验结果相吻合,表明运用仿真方法评价护栏安全性能具备一定可行性.研究结果为单坡面混凝土护栏的实际应用提供数据支持,为运用有限元动态仿真评价护栏安全性能方法的可靠性研究提供例证.Abstract: To know the crashworthiness and mechanism of a single slope concrete barrier,safety performance is evaluated using finite element analysis and a full-scale impact test.The results indicate that the single slope concrete barrier is able to hold up to 400 kJ impact energy and all index meet the crashworthiness specification,when the impact conditions are that the bus weight is 14 t,velocity is 80 km/h,and impact angle is 20°.One crashworthiness mechanism of the single slope concrete barrier is that the impact makes the vehicle climb up and lean along the slope to absorb kinetic energy and increase impact time.Simulation results match those of tests and prove the feasibility of the barrier safety evaluation.This research provides data for single slope concrete barrier application in reality and is an example to evaluate barrier safety based on dynamic FEA method.
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Keywords:
- concrete barrier /
- impact test /
- simulation /
- safety evaluation
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