一、前言城市里的过街地下通道,火车站内人流通行的地道,以及地下铁道等工程中常采用箱形结构,剖面型式大多如图1(a)、(b)、(c)所示,其结构类型属闭合框架。从受力情况来看,可视为平面变形问题,沿纵向取一米宽作为计算单元按闭台框架计算。 I. Introduction The box-shaped structure is often used in underground crossings in cities, underground passages in railway stations, and underground railways. The cross-sectional patterns are mostly shown in Figure 1(a), (b), and (c). The type is a closed frame. From the stress situation, it can be regarded as a plane deformation problem, taking one meter width in the longitudinal direction as the calculation unit according to the closed-stage frame calculation.