摘要
采用自然坐标系统,根据圆锥壳应变—位移关系,导得简支曲线条元的应变矩阵、单元刚度矩阵及其相容荷载列阵,在IBM—PC微机上编制了计算机程序,通过曲线箱梁实例计算表明,当加大半径时,曲条法与笔者另行编制的高阶直条法结果吻合良好;当缩小半径时,曲线箱梁的内力变化规律与实际相符,证实了程序的正确性。
With strian—displacement relationships of the conical shell, this paper respectively derived strain matrix, element stiffness matrix and column matrix of modal forces for the simple curved strip under orthogonal coordinates.These matrixes were programmed on IBM—PC microcomputer. Some examples of curved box girder were given to show that a close approximation to the straight strip method could be obtained if the radius was set to a very large value; if the radius reduced, the internal force variations of curved box girder were in good agreement with the practical case.The accuracy of the program was verified in this paper.
关键词
曲线箱梁
有限条法
圆锥壳
单元刚度矩阵
curved box girder, finite strip method, conical shell, element stiffness matrix
