低矮型钢-混凝土组合梁桥方案设计与分析

以36m跨径的简支梁桥改造设计为例,分析比较了普通组合平行工字梁、预应力组合平行工字梁和组合箱梁三种桥型在相同荷载等级作用下的受力、变形以及经济性能.结果表明,组合梁桥具有较好的性能,预应力组合梁和组合箱梁的经济高跨比可以小于1/20.

Design and analysis of steel-concrete composite bridge with shallow-section

For an example of the alteration design of the simple-supported girder bridge with the span of 36?m, the static behaviors, such as stress at the critical section and deformation, the economical index of three types of composite bridges were analyzed and compared. The three types of composite bridges were considered, namely normal steel-concrete composite bridge with parallel I-shape girders, prestressed steel-concrete composite bridge with parallel I-shape girders, and steel-concrete composite bridges with box-girders. It is demonstrated that the steel-concrete composite girder bridge has good static behavior, and the economical height-to-span ratio of presstressed composite bridges with parallel girders and composite bridges with box-girders may exceed the value of 1/20.