圆筒型缓冲装置设计方法研究

Research on the Design Method of Cylinder Bumper Device

梁间碰撞是桥梁在地震中破坏的主要因素之一。随着抗震研究的进展,限位装置在桥梁中的应用研究也越来越多,但是以往的研究多局限于普通限位缓冲装置使用效果的定性研究,没有考虑具有耗能性能的装置的缓冲效果。该研究在试验的基础上提出了基于反应谱方法的具有耗能性能的圆筒型限位缓冲装置计算模型和设计方法,并采用动力时程分析方法对设计效果进行验证。研究表明圆筒型缓冲装置具有明显的缓冲效果,本设计方法是可行的,与普通缓冲装置相比,梁体与挡块之间的最大相对位移以及桥墩的塑性变形均有不同程度的减小。

Girder damage is one of the main part for bridge damages during earthquake. With the development of anti-seismic technology, more and more restrainers used for bridge protection are studied. But they are mainly limited in the qualitative study on the effect of bumper devices without consideration of dissipation capability. According to the experimental results on bumper devices with energy dissipation capability, the design method and calculating model based on the response spectrum are proposed.The mitigation effect of the methods of the compression bumpers on a model bridge is studied with nonlinear dynamic analysis. The results indicate that the cylinder bumper device has notable cushion effect. Comparing with the effect of bumper deviees without energy dissipation capability, it is evident that the ductility distortion of piers and the largest displacement between girders and stoppers would be reduced on different scale. The design methods of cylinder bumper device are effective.