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Construction Stage Analysis of Continuous Box Girder Constructed in Highly Horizontal Curve Alignment

posted Oct 14, 2009, 11:16 PM by Domain Admin   [ updated Sep 30, 2012, 2:55 AM ]

During The International Conference on Highway Engineering Computing, 2012, I and my colleagues-Rirattanapong T. and Chanintonleela M., published a technical paper entitled "Construction Stage Analysis And Construction of Overpass Bridge Crossing Intersection between Highway No.345 and Highway No. 3100 in THAILAND"  illustrating the application of nonlinear finite element analysis in design and analysis of continuous cast-in-situ box girder aligned in highly horizontal curve. The overpass bridge is geometrically designed to form the highly horizontal curve alignment with 2 traffic lanes composing of 7 continuous spans of 30+2x36+45+2x36+30 meters for the total length of 249 meters. Due to the highly horizontally curved geometry of the bridge, the analysis and design of the bridge are thus performed by utilizing the construction stage analysis in order to obtain the most effective and safety construction method of the bridge. To perform the construction stage analysis of the bridge, the finite element analysis (FEA) utilizing curved spine beam elements including the geometrical nonlinearity and time dependent effects for construction stage analysis is employed. Based on the FEA results, the direction of the construction of the highly horizontal curve continuous bridge alignment is a very important factor.

The uni-directional construction method using only cast-in-situ bridge segments from on side to another side of the bridge along the horizontal curve alignment could result in the overload causing distresses of the single bored piles with diameter of 1.80 meters supporting the box girder due to bi-axial bending. To be more economic and feasible to adopt the same pile diameter without any damages of the pile, bi-directional construction method incorporating both cast-in-situ and precast segments of the bridge is adopted based on FEA results. The details of the analysis and design including the achievement in the construction of the bridge can be refered to the paper.