跨中横向加劲肋对箱梁底板受力性能的影响

Impact of Bestraddling Transverse Stiffener on Mechanical Properties of Bottom Slab of Box Girder

对某连续刚构桥跨中底板空间进行了模拟,采用有限元方法分别计算了在跨中合龙段设置2道加劲肋与未设置加劲肋的箱梁底板应力,并对计算结果进行了分析。分析结果说明设置加劲肋对底板受力性能有较大的改善,使得底板最大横向拉应力减小35%,大大减小了底板出现纵向裂缝的机率。并得出了加劲肋对箱梁底板受力影响的规律。

A certain bottom slab space bestraddling a continuous rigid frame bridge is simulated. ANSYS finite element system method is used to calculate the stress of the two stiffeners set in bestraddling closure section and that of the bottom slab of box girdle without stiffeners. Calculation results are analyzed. The results show that the performance of box girder bridge becomes better by setting finite transverse stiffener transverse stress of the bottom slab of box girder and the maximum transverse stress of the bottom slab diminishes 35%, which greatly reduces the chances of longitudinal cracks on the bottom slab. Rules of impact of stiffener on bottom slab are educed.