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本文在上文［１］所导出的空间螺旋形薄壁曲线箱梁约束扭转微分方程及其参数解的基础上，用能量理论求出该箱梁单元的刚度矩阵与等效节点力算法，编制了按照刚度法分析的程序。通过与国内外文献的比较，验证了本方法的可靠性。
Based on the constrained torsion differential equation and its parameter solution of space-spiral thin-walled curved box girder derived in [1] above, the stiffness matrix and equivalent nodal force algorithm of box girder element are obtained by energy theory. In accordance with the stiffness analysis of the program. Through the comparison with the literature at home and abroad, the reliability of this method is verified.