Construction Technology of Synchronous Asymmetric Double Cantilever Girder for Cable-Stayed Bridge
Due to the constraints of terrain,geological and hydrological conditions,the traditional balanced and symmetrical construction of the main beam is often impossible,and it is necessary to consider the asymmetric or unbalanced construction scheme.Taking the cable-stayed bridge of the Yinzhouhu Bridge on the Zhongkai Expressway as the engineering background,two sets of finite element software are used to numerically simulate the commonly used construction schemes of the first side span bracket construction and the second mid span girder cantilever construction.Comparing the main calculation results,it is found that the two are in good agreement.Then,based on one set of finite element software,finite element models are established for four girder construction schemes:cast-in-place side span support followed by mid span cantilever lifting,symmetrical double cantilever construction with synchronous counterweight,asynchronous asymmetric double cantilever construction,and synchronous asymmetric double cantilever construction.By adjusting parameters such as cable force and counterweight,all four schemes are verified to be feasible,and the construction plan for synchronous asymmetric double cantilever girder is determined through economic and technological comparison.Finite element modeling is conducted on the three construction schemes of standard beam segments for synchronous asymmetric double cantilever girder construction.By adjusting the cable tension of the stay cables,the three construction schemes of standard beam segments are also practicable.The optimal scheme and its process are determined through technical comparison,guiding the girder construction of the bridge.The analysis of the elevation and cable force measurement data before the opening of the bridge indicates that the synchronous asymmetric double cantilever girder construction technology of the cable-stayed bridge is safe and reliable.
bridge engineeringcable-stayed bridgedouble cantilever girder constructionfinite element analysissynchronization asymmetry
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