The Study On Design Optimization Of Cantilever Construction For Continuous Rigid Frame Bridge With High Ratio Of Side Span To Central Span In Mountain

In this paper, the key technical problems encountered during the design and construction of the bridge are studied for the common high ratio of side span to central span continuous rigid frame bridge in mountainous area.This paper makes a detailed discussion on the common disease problems existing in the continuous rigid frame bridge, and puts forward the corresponding design and construction preventive measures.For asymmetric beam segment construction counterweight problem. In this paper, based on a mountain high ratio of side span to central span continuous rigid frame bridge as a practical example, the aspect to the counterweight were discussed in detail.For continuous rigid frame bridge midspan closure jacking thrust values, according to its different top push principle to produce the effect of comparative analysis, and ultimately determine the to offset the pier top horizontal displacement for the goal of jacking force value method compared to only consider the creep and shrinkage of concrete, temperature effect for the purpose of jacking force value method is more reasonable.For the three span continuous rigid frame bridge is common, study its closure process problem is the focus of this paper. According to the mountainous area of Yunnan Province, a base high side cross ratio of continuous rigid frame bridge as the example, through its internal force in different stages and in different conditions, stress, deflection were analysis, get the final, first closing up of side span and closing cross scheme compared to the closing cross again folded edge cross scheme. At the same time, through the comparative analysis of the two kinds of different closure process of Prestressed Continuous Rigid Frame Bridge with beam on the cloth beam has little effect.