Abstract
The box section which can meet the requirements of wider deck is widely used in the construction of continuous rigid frame bridge. However, the shearing force lag is very obvious, which causes the inhomogeneous distribution of stress in the cross section, and it may threaten the safety of the bridge structure when it is serious. Taking a continuous rigid frame bridge located in Yunnan, China as an example, this paper establishes the finite element calculation model of the bridge to analyze the stress inhomogeneity in the construction stage. The results show that the shear lag coefficient of the section is constantly changing during the dynamic process of construction, with the increase of the length of the cantilever, the shear lag coefficient gradually converges to 1; prestress is the most important factor that causes the lateral inhomogeneity of the positive stress.
Highlights
The box section which can meet the requirements of the wider deck is widely used in the construction of continuous rigid frame bridges
The shearing force lag is very obvious, which causes the uneven distribution of stress in the cross section, and it may threaten the safety of the bridge structure when it is serious
Taking a continuous rigid frame bridge located in Yunnan, China as an example, this paper mainly evaluates the cross-sectional stress inhomogeneity from the shearing force lag at construction stage and the stress concentration caused by prestress
Summary
The box section which can meet the requirements of the wider deck is widely used in the construction of continuous rigid frame bridges. This kind of bridge has many characteristic such as spacing of the web is large, horizontal width of the flange is large, box wall is thin and so on. Taking a continuous rigid frame bridge located in Yunnan, China as an example, this paper mainly evaluates the cross-sectional stress inhomogeneity from the shearing force lag at construction stage and the stress concentration caused by prestress. The main beam is a single box and chamber variable section prestressed concrete continuous box girder, the standard width of the bridge is 12.0m, the design load is grade I, the design speed is 80km/h, and the design safety grade is I, he basic seismic intensity of seismic fortification is 7 degrees, the basic earthquake acceleration is 0.15-0.1g, seismic fortification measures are taken at 8 degrees
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