折线形拱管结构设计中,通常计算由垂直荷载引起的平面内内力Mx、Nx、Qx和由水平荷载引起的平面外内力My、T、Qy,然后进行内力组合和强度校核。现有文献均没有考虑由于水平位移后在垂直荷载作用下所产生的对支座的附加力矩。这个附加力矩到底有多大,工程设计中能否忽略不计?本文从理论上加以推导,并给出实用计算公式。 In the design of the linear arch pipe structure, the internal forces Mx, Nx, Qx in the plane caused by the vertical load and the forces My, T, Qy in the plane caused by the horizontal load are usually calculated, and then the internal force combination and the strength check are performed. None of the existing literature considers the additional moment to the support due to vertical loading after horizontal displacement. This additional torque in the end how big, engineering design can be ignored? This paper is derived from the theory, and gives a practical formula.