三跨斜交连续梁应力变化率的分析

Analysis on Stress Change Rate of Three-span Skew Continuous Beam

利用有限元软件建立不同斜度下的连续梁模型,计算三跨连续梁跨中位置的应力,可以得到连续梁在斜度不同的情况下应力变化的规律,尤其是双室箱梁顶板和底板的变化是最为显著的。分析可以得到结论:集中力下,斜度越大,应力变化率越小;斜度对翼缘板上的应力变化率影响显著;斜度较小时,应力变化率较小,斜度较大时,应力变化率较大。

The finite element software is used to establish the models of continuous beam with different slopes,which can calculate the stress of the midspan position of three-span continuous beam, and can get the law of the stress change of the continuous beam under the different slopes, especially, the change of top plate and bottom plate of double-chamber box girder is mostly significant. The analysis conclusion shows that the greater is the slope, the smaller is the stress change rate under the concentrated force. The slope obviously affects the stress change rate on flange plate. The stress change rate is smaller while the slope is smaller. The stress change rate is larger while the slope is larger.