新型混合梁桥结构体系及力学性能研究

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

摘要:

针对大跨度梁桥的结构形式及应用特点，提出了在纵桥向用预应力混凝土梁和钢-混凝土组合梁相混合的新型混合梁桥结构体系。分析并比较了这种新型混合梁相对于其他形式梁桥的优势。推导了用于计算新型混合梁桥结构受力的表达式，总结了影响新型混合梁桥结构受力的关键因素，并得到这种混合梁边中跨比例与中跨结合段位置的相关关系。通过一工程实例的力学性能计算，比较不同计算方法的计算结果，表明本文提出的计算方法具有足够的计算精度，可应用于新型混合梁的结构计算之中。

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.