论文部分内容阅读
我国20世纪60年代、70年代修建的大量防护工程抗力等级较低,急需进行加固补强。进行了化爆作用下,外贴FRP条带加固钢筋混凝土(RC)双向板抗爆性能的试验研究。按介质-结构相互作用理论确定结构的爆炸冲击荷载,建立了加固板的三折线弯曲抗力模型,利用虚功原理建立了加固RC板的运动微分方程,按数值方法求解了外贴FRP加固双向板在化爆冲击波作用下的动力响应时程,分析结果与试验结果吻合较好。研究结果表明:外贴FRP条带加固可以有效延缓混凝土的开裂、限制裂缝的开展,提高RC双向板的刚度,减小结构位移,减轻结构破坏程度,外贴FRP加固RC双向板的抗爆炸冲击波能力得到了明显提高,外贴FRP条带在极限状态时发生了剥离破坏和断裂破坏。
In the 1960s and 1970s, a large number of protection projects in our country were built with relatively low resistance level, which urgently needed reinforcement and reinforcement. Under the action of detonation, experimental study on the antiknock performance of two-way reinforced concrete (RC) slab strengthened with FRP strips was carried out. According to the medium-structure interaction theory, the explosive impact load of the structure is determined, and the bending resistance model of the stiffened plate is established. The differential equation of motion of the stiffened RC plate is established based on the principle of virtual work, and the two- The dynamic response of the explosive under the action of shock wave, the analysis results and the experimental results are in good agreement. The results show that the reinforcement of externally bonded FRP strips can effectively delay the cracking of concrete, limit the development of cracks, increase the rigidity of RC double-deck slab, reduce the displacement of structure and reduce the structural damage. The anti-explosion shock wave Ability has been significantly improved, posted outside the FRP strip in the ultimate state of the occurrence of a peel failure and fracture damage.