中文摘要：

在前期研究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，重点在于探讨梁端约束条件可能对防护效果产生的影响．在数值模拟的过程中，分别考虑了无防护、刚性防护、柔性防护和阵列式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、冲击力等参数，对比分析不同防护装置的抗撞效果．数值结果表明，在相同的冲击条件下，尽管复合防护的效果最优，但梁的约束形式仍对动力反应峰值的抑制效果有显著影响，其中又以两端固支梁的防护效果为最好．

英文摘要：

The impact-resistant performance of steel-reinforced concrete beams with a rigid-flexible composite structure was ana- lyzed based on our earlier research outcomes. The focus was to disscuss the influence of constraint forms on the crashworthy perform- ance of reinforced concrete beams with composite laminates. In the process of numerical simulation, the observed beam with four dif- ferent measures incluing the unprotected, the rigid protective, the flexible protective and the proposed one was considered separately. Meanwhile, three considered constraint forms of the beam ends were as follows ： fixed at both ends ; hingled at both ends ; fixed at one end and hingled at the other end. Protective effects of the different measures were compared and analyzed by observing the strain, the displacement, the acceleration and the impact force of the target beam. Numerical results show that, under the same impact conditions the composite system can obtain the optimal protective effect, but constraint forms may have significant impact on suppression of the dynamic response of the beam. Especially, for the beam fixed at both ends the best protective effect may be obtained.