新型抗震挡的减震作用

针对当前抗震挡多为刚性,在地震作用下,易与上部结构发生碰撞而产生脆性破坏这一情况,提出一种具有耗能减震作用的柔性抗震挡,并建立了碰撞模型,探讨了碰撞力与碰撞刚度和阻尼比之间的关系.同时,选取一座双层三跨连续梁桥进行有限元计算研究.结果表明:随着碰撞刚度的不断增大,碰撞力也随之增大,墩梁相对位移相应减小,但通过设置合理的碰撞刚度、初始间隙等参数,新型抗震挡就可以取得良好的减隔震效果.

Cushioning Effect of New Seismic Block

In view of the situation that, the seismic block is usually rigid, so brittle damage usually occurs under the action of the earthquake, a kind of flexible aseismic block which has the effect of energy dissipation and seismic mitigation was put forward, and established the collision model was established, the relationship of impact with collision stiffness and damping ratio was discussed. At the same time, a model of double three span continuous beam with gate pier was established. It turned out tha$...with the increasing of collision rigidity, impact increased and the relative displacement of the pier and the beam decreased, but by setting reasonable parameters such as colliding stiffness initial clearance, it would get favourable effect of vibration isolation.