样条箱拱段子域在箱拱桥梁中的应用

The application of the spline box arch subdomain in box arch bridge

以薄壁箱拱理论、变分原理及样条函数方法为基础,建立了样条箱拱段子域(单元),考虑了剪力滞效应及畸变效应.这种子域(单元)为两结点18自由度的子域(单元),能模拟薄壁箱拱的拉压、弯曲、扭转、扭翘、剪切、剪力滞效应及畸变效应.文中附有算例,计算结果表明:这种子域(单元)不仅计算简便,而且精度高.

In this paper,the spline box arch subdomain （element） was established based on thin-wall box arch theory,variation principle and spline function method with a consideration of the effect of shear lag and distortion. The tension and compression,bending,torsion, warping,shear and the effect of shear lag and distortion can be modeled by the 2 nodes 18 degree of freedoms subdomain （element）. There is an example attached in the paper and the result showed that the subdomain （element） is convenient to computing with a high accuracy.