装配式UHPC防船撞耗能装置的性能

来源期刊:中南大学学报(自然科学版)2019年第4期

论文作者:周凌宇 濮星旭 卫军

文章页码:923 - 931

关键词:船桥碰撞;防撞耗能装置;LS-DYNA程序;超高性能混凝土;装配式;桥墩

Key words:ship-bridge collision; anti-collision energy dissipation device; LS-DYNA program; ultra-high performance concrete(UHPC); assembly type; bridge pier

摘    要:提出一种新型装配式超高性能混凝土(UHPC)防船撞耗能装置。该装置由模块化生产的独立UHPC分箱组成,各分箱通过高强螺栓进行连接;采用非线性显式动力分析程序ANSYS/LS-DYNA对该防撞装置的性能进行分析与研究。研究结果表明:这种防撞装置可以显著减小撞击力并延长船桥碰撞时间,在1,3和5 m/s这3种不同撞击速度下,最大撞击力分别降低19.00%,39.17%和33.15%,撞击持续时间分别延长47.68%,132.61%和168.89%;当撞击速度为5 m/s时,船桥碰撞产生的撞击力为31.1 MN,超过桥墩设计抗力,而防撞装置的存在使最大撞击力下降到非破坏性水平20.79 MN。

Abstract: An innovative precast ultra-high performance concrete(UHPC) protection system for bridge pier against ship collision was proposed. This protection system is made of separate modular UHPC segments, which is connected by high-strength bolts. An in-depth analysis of performance evaluation of this protection system was conducted by the nonlinear finite-element analysis program ANSYS/LS-DYNA. The results show that this new protection system can protect the bridge piers and ships via significantly reducing the collision forces and effectively increasing the impact time of ship-bridge collision. The peak impact forces are reduced by 19.00%, 39.17% and 33.15%, and the impact durations are prolonged by 47.68%, 132.61% and 168.89% at different impact velocities of 1, 3 and 5 m/s, respectively. When the impact velocity is 5 m/s, the peak impact force is 31.1 MN without the protection system, which is higher than the design resistance of the bridge pier. However, if this new protection system is installed on the bridge pier, the peak impact force is 20.79 MN, which is reduced to non-destructive level.

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