考虑弹性支承和剪切变形影响的单跨斜梁温度次内力分析

在考虑端横梁弯曲和支座变形对斜主梁提供的弹性抗扭支承和竖向弹性支承以及斜主梁剪切变形的基础上,导出了考虑支承刚度以及剪切变形影响的单跨斜梁温度次内力的计算公式,并通过一个简单算例对公式进行了验证,分析了支承刚度、斜度以及剪切变形对斜主梁温度次内力的影响。研究结果表明,在一定范围内,端横梁抗弯刚度的变化会引起斜梁温度次内力的急剧变化;斜主梁的温度次内力可以通过改变端横梁的抗弯刚度进行有效的调整;当斜度等于0°时,剪切变形对次扭矩的影响达到最大,为10.6%。

Analysis of temperature sub-internal force in single span skew girder considering elastic support and shear deformation effect

A model is presented considering the end transverse beam bent and rubber seat defomation of single span skew girder.The calculation formula of temperature sub-internal force in single span skew girder with considering support stiffness and shear deformation effect is derived and verified through a simple example.The influence of support stiffness and skewness on temperature sub-internal force in single span skew girder is analyzed.Results showed that the change of the end of the beam bending stiffness can cause temperature sub-internal force dramatic change on skew girder within a certain range,the temperature sub-internal force of skew girder can be effectively regulated by changing the end of the beam bending stiffness;the skew angle significantly affects the secondary internal forces,especially the secondary torque moments.When skew angle equals to 0°,the influence of shear deformation on secondary torque reach maximum,the value is 10.6%.