斜交角度对单跨超静定曲梁内力的影响

Influence of Skew Angle on Internal Force of Single-span Over-static Determinate Curved Beam

为了揭示斜支承曲线梁桥的力学特性,应用结构有限元分析软件ANSYS建立斜支承单跨曲梁模型,详细分析斜度、弯扭刚度比、荷载类型等对斜支承曲梁内力的影响,绘制的大量曲线清晰显示了各项因素对斜支承曲梁内力的影响规律。研究结果表明,对单跨曲梁,如果一端为斜支承且斜度为正时,该支点截面将产生负弯矩,且负弯矩随着斜度增大而增大;当斜度为负时,存在一个使支点截面产生正弯矩的临界斜度,该斜度随弯扭刚度比的增大而增大。

In order to open out the mechanics characteristic of the raking shoring curve beam bridge,the finite element analysis software ANSYS of structure is used to set up the raking shoring single-span curved beam model.It analyzes in detail the influence of slope,crankling rigidity ratio,loading type and etc.on the internal force of raking shoring curved beam,and draws a great deal of curves clearly to display the influence laws of various factors on the internal force of raking shoring curved beam.The study result makes clearly that if one end is the raking shoring and the slope is positive for the single-span curved beam,the section at this support will produce the negative moment,and the negative moment is increasing with the increment of slope.When the slope is negative,there is a critical slope to make the section at the support produce the positive moment.This slope is increasing with the increment of the crankling rigidity ration.