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Numerical investigation of the behavior of precast concrete segmental columns subjected to vehicle collision

机译：预制混凝土节理柱在车辆碰撞下的性能数值研究

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摘要

This study numerically investigates the response of precast concrete segmental columns with unbonded prestress tendons subjected to vehicle collision. Numerical models are developed using LS-DYNA and validated against experimental tests. The validated model is then used to perform intensive numerical simulations to analyze the effectiveness of prestressing level, number of segments, concrete strength, and vehicle velocity on the behavior of precast segmental concrete columns. The numerical results have shown that the effect of the initial prestressing level and the number of segments are marginal on the impact force time history but significant on the residual displacement and the damage of the column. Better self-centering capacity as well as smaller lateral displacement can be achieved on segmental columns by reducing the number of column segments and increasing the prestress level. In addition, the height-to-depth ratio of a concrete segment should be smaller than two in order to minimize an undesirable local damage at the rear side opposite the impact point. Varying concrete strength from 20 MPa to 80 MPa shows an unnoticeable change of the impact force but its effects on mitigating the damage of the columns are considerable. Last but not least, increasing the impact velocity does not always increase the peak impact force of a segmental column. It is recommended that both the peak impact force and impulse should be taken into consideration in the analysis and design of segmental columns against vehicle impact.
机译：这项研究数值研究了预应力混凝土分段柱在未发生车辆碰撞时具有无粘结预应力筋的响应。使用LS-DYNA开发了数值模型，并针对实验测试进行了验证。然后将经过验证的模型用于进行密集的数值模拟，以分析预应力水平，节段数，混凝土强度和车辆速度对预制分段混凝土柱性能的影响。数值结果表明，初始预应力水平和节段数对冲击力的历时影响很小，但对残余位移和柱子的破坏影响很大。通过减少柱段的数量和增加预应力水平，可以在分段柱上实现更好的自定心能力以及较小的横向位移。此外，混凝土段的高深比应小于2，以使与冲击点相对的后侧的不良局部损坏最小。从20 MPa到80 MPa不等的混凝土强度显示出冲击力的显着变化，但其对减轻柱子损坏的影响相当大。最后但并非最不重要的一点是，增加撞击速度并不总是会增加分段柱的峰值撞击力。建议在分析和设计针对车辆碰撞的分段柱时，应同时考虑峰值冲击力和冲击力。

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