Abstract
The continuous rigid frame bridge is one of the main bridge types used to span rivers in mountainous areas due to its high rigidity. However, due to the poor geological conditions in mountainous areas, the probability of instability and other safety accidents increases. Therefore, strict construction scheme design must be carried out. According to the cast-in-place section of the side span of a continuous rigid frame bridge in a mountainous area, this paper puts forward three construction schemes that may be applicable. The finite element software is used to establish the model, and the girder stress and bridge alignment with different construction schemes are analyzed. Combined with the grading index evaluation method, the optimal construction scheme is finally obtained.
Highlights
Long span continuous rigid frame bridge has the advantages of large stiffness and good seismic performance
When the side span girders are located in steep terrain, if the conventional floor support cast-in-place construction scheme is adopted, the height of the support required is too high
In view of the construction difficulties of side span cast-in-place girders under the condition of steep terrain, this paper proposes three construction schemes referring to the construction experience of similar bridges[4,5,6,7,8]
Summary
Long span continuous rigid frame bridge has the advantages of large stiffness and good seismic performance. It is one of the main bridge types crossing deep ditches and rivers. When the side span girders are located in steep terrain, if the conventional floor support cast-in-place construction scheme is adopted, the height of the support required is too high. The pier foundations are located on the steep slope, so the construction is difficult, and the economy and safety are poor[1,2,3]. In view of the construction difficulties of side span cast-in-place girders under the condition of steep terrain, this paper proposes three construction schemes referring to the construction experience of similar bridges[4,5,6,7,8]. The results show that scheme 2 is reasonable and economical
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