钢筋混凝土复合防护梁的抗撞性能研究

Impact-resistant performance of a reinforced concrete beam with composite laminates

传统结构构件设计较少考虑碰撞效应,因此有可能因碰撞荷载而引起严重的冲击破坏。鉴于此,在前期提出的刚柔复合防护结构体系的基础上,针对钢筋混凝土复合防护梁的抗撞性能进行了分析研究。在数值模拟的过程中,分别考虑了无防护、刚性防护、柔性防护和刚柔复合防护四种不同的措施以及两端固支、两端铰支和一端固支一端铰支三种不同的梁端约束形式。通过观测钢筋混凝土梁的应变、位移、加速度和冲击力等参数,可评价相应的抗撞效果。数值结果表明,提议的复合防护体系效果最好,可以有效抑制受撞构件的冲击响应;同时,构件约束形式对抗撞性能的影响也是不容忽视的。

Traditional design of structural members considers less collision effects,so it may be possible to cause damage due to impact loads. Here,the impact-resistant performance of a steel reinforced concrete beam with rigid-flexible composite protective structure was analyzed based on the earlier study outcomes. In numerical simulation,the observed beams with four different measures including unprotected,rigid protective,flexible protective and the proposed one were considered,respectively. Meanwhile,three considered constraint forms of beam ends included fixed at both ends,hinged at both ends,fixed at one end and hinged at the other one. Protective effects of the different measures were evaluated by observing the strain,displacement,acceleration and impact force of the target beam. Numerical results showed that the proposed composite protective system works best; moreover,the constraint forms of the structural components also have a significant impact on the protective effects.