Analysis Of Shock Absorption & Resistance On The Step River Bridge Of Batang Project In Yunnan Province

Since the beginning of human civilization, the earthquake disaster is taking place constantly, causing a great number of people to injury and death,destructing the structures as building, bridge, etc. to collapse. In order to reduce the losses brought by the earthquakes and safeguard the safety of people's life andproperties, many steps have been taken by many countries to improve the antidetonation performance of building. For a long time, the engineers resist passively by strengthening the roof beam, post and using strength cut wall. More active ways to reduce the earthquake strength in small structure are needed. In recent decades, some new antidetonation technologies are put forward to improve the antidetonation performance of the structure, one of which is to reduce and separate the shaking.This paper mainly focuses on the antidetonation problem of the Yunnan Batang River Step Bridge, which crosses over the White River located on the highly active rupture development zone. With the four alternatives of the rubber plate bearings(RPB) ,polyvingl fluoride plate .Lead rubber bearings(LRB),Fluid Viscous Dampers(FVD). and the analyses on shock absorption effects of the structure along and across river, the GZY300 LRB alternative with k=1.5KN/mm and u =0.25 is recommended. With the recommended one, the average earthquake response parameter of along & across river modes deduces 54%. andthe effects of shock attenuation are evident. Compared with the RPB alternative, which has the similar shock attenuation effect, the recommended one saves 572 millenary Yuan.According to the antidetonation analysis on the Pour siphon in bridge and associated ease base, the special treatment is generally not required. Combined with joining the anchor pole with ease base, the ground broken rock body can be treated by grouting. The requirements with the bridge and Pour siphon for the antidetonation structure and the steps to alleviate the shake disaster is proposed in this paper. With the anti-detonation steps for the bridge and its Pour siphon, the designed intensity is decreased a level under the general earthshock. Therefore, the bridge and Pour siphon have enough safe abundance. The faultage moves will only affect parts of bridge steps, not spread to the whole bridge. On both sides of bridge and mid-bridge frusta, a PDLR800-40-700 corrugated pipe expand section is installed to control the destroyed range from faultage moves of the Pour siphon, and ripple tubes around the faultage are densified.With the analysis of the results derived from the antidetonation & shock absorption computations for the bridge and Pour siphon, this paper proposed some economical, reasonable and effective steps to resist and absorb the earthquake, and provided a scientific foundation for antidetonation design. From the references at hand, it's the first time to introduce the LRB antidetonation technology into the bridge projects in Yunnan province. This paper contributes to the spread of antidetonation technology to the bridge projects.