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）.