薄壁箱形大曲率梁桥理论分析

ANALYSIS OF THIN-WALLED BOX GIRDER BRIDGES WITH GREAT INITIAL CURVATURE

对于截面周边可变形的大曲率薄壁箱梁,本文提供了实用的理论计算方法。本文分析了初曲率对周向应变和扭转翘曲的影响,构造了一个考虑初曲率影响的弯曲、扭转、剪力滞和畸变位移模式,运用最小势能原理导出控制微分方程。最后对本文理论还进行了验证。

In this paper, the authors offer a practical and theoretical method for calculating thin-walled box girder in plan with great initial curvature and deformable cross section. In which the effect of initial curvature on circumferential strain and torsional warping is analyzed, and the flexure, torsion, shear lag and distortional warping displacement functions are established in consideration of the above-mentioned effect. The elastic governing differential equations are derived from the principle of minimum potential energy. The accuracy of presented theory is verified by comparison of the numerical solutions obtained using Galerkin's method with those by the folded plates theory.