Abstract：Research purposes: The purposes of this paper are to study the design features, the method of designing the section dimension and the reasonable construction technique for asymmetric continuous beam to guarantee the safety of construction of beam according to the requirements of topography of the bridge site.
Research methods: By using 3D-FEM software, the analysis is made for pressure conditions of asymmetric continuous beam during construction stage and service stage, the section dimension of beam and the construction sequence for cantilever casting in place are designed.
Research results: The problem of balance of internal force within beam can be solved by adjusting the beam height and section sizes of side span and main span of the asymmetric continuous beam and the safety of construction of asymmetric continuous beam can be guaranteed and the requirement of liner for beam can be met by adopting reasonable construction method.
Research conclusions: Based on the requirements of bridge site and the analysis result of the bridge, an asymmetric continuous beam with the main spans arranged as(52+112+64)m asymmetric spans is adopted to the main bridge of Dayuanli double line extra-long bridge. The ratio of minimum side span to main span was only 0.464, and the problem of segment unbalance can be solved by adopting two parabola for beam curve and two different heights of beam. In addition, application of reasonable construction methods can guarantee the construction safety.
2006, Vol. 23 
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