Study on mechanical behavior and structural system of new type hybrid-beam bridge

Abstract:

Against large-span beam bridge structure and its application characteristics, a new type hybrid-beam bridge, consisted of prestressed concrete beam and steel-concrete composite girder in longitudinal, is proposed. The advantages of this new hybrid beam comparing to other forms of beam bridge are analyzed and compared. Expression for calculating the mechanical behavior of this new type bridge is derived and the key factors that affect the mechanical behavior of the new hybrid beam bridge are summarized. The correlation between the length ratio of side span and mid span and the position of combined segment in the mid span is obtained. The mechanical properties of an actual project are calculated by the method proposed here and the finite element method respectively. Comparison on the calculation results tests that the deduced method in this paper is accurate highly and it can be used in the computing and analyzing the structural behavior of this new type mixed-beam bridge.