The Research Of Shear Lag And Isolation Bearing Steel-Concrete Composite Box Beam

With the development of transportation. Bridges have made great development. The earthquake damage to the bridge will directly lead to road paralyzed, this problem with the increase of proportion of Bridges in highway, more and more highlighted. Bridge vibration isolation design concept has been more and more be taken seriously. Lead core rubber isolation bearings (LRB) and high damping rubber isolation bearings CHDB) due to its work with stable performance, strong earthquake energy and increase the structural ductility, damping effect is significant, and its construction is convenient, used widely in engineering practice.This paper mainly introduces the lead core rubber isolation bearing and high damping rubber isolation, introduce two kinds of the stress of the bearing performance and shock absorption principle.Based on the hong kong-zhuhai-macao bridge CB05 standard shallow area non-navigation parts as engineering background, using Midas/civil finite element three-dimensional model to study the dynamic response of the two bearings under seismic action. Analyzing and comparing the two kinds of isolation bearing and common laminated rubber bearing in dynamic response under the action of earthquake, including the natural vibration period of structure, the structure of the maximum acceleration and maximum displacement of the structure of reaction and the pier at the end of the comparison. Studied the influences of damping ratio the interval of the pedestal, got the lead rubber bearing and high damping rubber bearing for damping ratio change in the linear fitting curve.Since the shear lag effect was found up to now, research workers have been keen to research area. This paper introduces the analysis of several commonly used analytical method of shear lag, reduce isolation part engineering background, using Midas/FEA finite element model is established. Analyzes the steel-concrete composite continuous girder bridge during construction, under the action of gravity, bridge panel without the influence of the length of bridge panel shear lag effect; Analysis of the prestressed continuous composite beams at constant load of the shear lag effect; Under vehicle load is studied, and the structure of different eccentricity on the bridge panel shear lag effect.