斜交连续箱型钢混组合梁受力性能分析

Analysis on the Mechanical Performance of Skew Continuous Box-shaped Steel-Concrete Composite Beam

文章以深圳外环高速一座(47+47)m斜交连续箱型钢混组合梁为工程背景,采用Midas Civil有限元软件分别建立单梁模型和梁格模型,对比分析了结构支反力、变形及纵横向应力变化情况,给出了两种模型的受力特性差异,得出单梁法不能准确反映横向各纵梁之间差异的结论。同时分析构造设计对主梁受力的变化的影响,结论可作为同类型桥梁设计的指导。

Based on the engineering background of a(47+47)m skew continuous box-shaped steel-concrete composite beam in Shenzhen Outer Ring Expressway,the single beam model and grillage model are established by Midas Civil finite element software.The changes of structural support reaction force,deformation and longitudinal and transverse stress are compared and analyzed,and the difference in mechanical characteristics between the two models is given.It is concluded that the single beam method can not accurately reflect the difference among the longitudinal beams in the transverse direction.At the same time,the influence of structural design on the change in force on the main beam is analyzed.The conclusion can be used as guidance for the design of the same type of bridges.