预制矩形箱涵受力性能模拟及其潜在的破坏模式

以沈阳市浑南新城区综合管廊工程预制拼装施工段为研究背景，针对城市地下综合管廊预制矩形箱涵单个管节，通过通用有限元分析软件ABAQUS进行数值模拟，研究分析其在不同埋深下的结构变形和应力分布规律.建模中为了尽可能地贴近预制箱涵的实际受力情况，参照实际工程应用对其进行了配筋.本模型中通过改变施加于顶板和侧壁板的荷载大小来模拟埋深的变化:对综合管廊顶板施加均布压力，对侧壁板施加线性变化的侧土压力，最终分析预制箱涵在不同埋深下的结构变形和应力分布，并提出结构安全隐患存在的部位和其潜在的破坏形式，为复杂条件下预制综合管廊的设计和施工提供理论参考.

Mechanics Performance Analysis of Precast Rectangle Box Culvert and Damage Prediction of Key Parts

Taking the prefabricated construction section of the Hunnan New Development Area utility tunnel construction in Shenyang， China as research background， the numerical simulations of structural deformation and stress distribution of single precast rectangle box culvert at different burial depths were carried out through the general finite element analysis software ABAQUS. In order to modeling the actual stress of the precast rectangle box culvert as accurately as possible， the reinforcement was carried out according to the actual engineering application. This model simulated the different buried depths by changing the load of roof and side wall， where a uniform pressure was loaded on the roof and the lateral pressure varied linearly was loaded on the side wall. Finally this paper analyzed the structural deformation and stress distribution of precast rectangle box culvert at different buried depths， pointing out the existing structural safety problems and potential failure modes， to provide a theoretical reference for the design and construction of utility tunnel engineering.