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为研究钢骨混凝土桥墩的撞击动力性能,运用有限元动力分析软件LS—DYNA,对钢筋和钢骨混凝土桥墩模型的撞击动力性能进行了模拟分析。采用两种本构模型(KCC模型、CSC模型)来模拟混凝土的撞击动力强度。将模拟计算的撞击力、撞击位移、撞击头加速度和墩身测点应变与试验结果做了对比,两者吻合较好。CSC模型能够更好地模拟撞击中混凝土的动力学性能。在此模拟基础上,研究了内置钢骨形式对桥墩撞击动力性能的影响,以及配钢率对桥墩撞击承载力的影响。分析结果表明,在相同撞击能量下,内置圆钢管的混凝土墩身应力较小,抗撞击动力性能较好;钢骨混凝土桥墩的抗撞击承载力随着配钢率增大而提高,但配钢率增大至一定程度后抗撞能力几乎不再提高。
In order to study the impact dynamic performance of steel reinforced concrete piers, the impact dynamic performance of reinforced concrete and steel reinforced concrete piers model was simulated with finite element dynamic analysis software LS-DYNA. Two constitutive models (KCC model, CSC model) are used to simulate the impact strength of concrete. The simulation calculation of the impact force, impact displacement, impact head acceleration and the measured point pier and the test results were compared, the two agree well. The CSC model can better simulate the dynamic behavior of concrete during impact. Based on this simulation, the influence of the built-in steel form on the pier dynamic performance and the impact of the steel ratio on the pier impact load capacity are studied. The analysis results show that under the same impact energy, the stress of the concrete piers with built-in round steel pipe is smaller and the anti-impact dynamic performance is better. The anti-impact bearing capacity of SRC piers increases with the increase of steel ration, After the rate increases to a certain extent, the collision resistance hardly increases any more.