门框墙内力计算模型的比较分析

依照《人民防空地下室设计规范》对门框墙构件设计计算时,其内力采用悬臂梁结构计算模型,但是门框墙结构从结构受力特性上分析更接近于四边约束的板式结构。在相同受力条件下,分别按基于规范的悬臂梁解析模型、基于板结构的门框墙结构模型和悬臂板结构模型,计算了固定端的内力。采用有限单元方法,对门框墙结构模型和悬臂板结构模型进行了数值计算。计算结果表明,基于规范的悬臂梁模型解析计算结果与门框墙结构模型数值计算结果(实际受力)相比,计算值偏大,大约增大10%。

Comparative Analysis of the Calculation Models of Doorframe Wall's Internal Forces

When designing the doorframe wall of civil air defense according to the Code for Design of Civil Air Defense Basement,the internal forces are computed based on the cantilever beam model.But the doorframe wall′s structure is similar to the shell structure which is fixed restraint on four sides.Under the same applied force condition,we compared the values of the internal forces of the fixed end using three models:the cantilever beam analytic model based on the Code,the doorframe wall structure model based on the shell structure element and the cantilever slab structure model.Using the finite element method,the internal forces of the doorframe wall structure model and the cantilever slab structure model are computed numerically.The results indicate that the values of internal forces(force and bending moment) using the cantilever beam analytic model are maximal,which is greater by than the value of the doorframe wall structure model(actual internal force).