人防门框墙计算方法研究

Research on calculation method of frame wall of civil air defense door

人防门框墙是人防工程中用于支承防护门的钢筋混凝土构件。《人民防空地下室设计规范》将门框墙按悬臂构件进行计算,但实际上门框墙是受弯工作的开洞平板,按四边约束的板式构件来进行受力分析更为合理。本文以某loft车库人防地下室为例,通过规范计算方法、ABAQUS有限元模拟方法分别对不同高度的人防门的上挡墙进行研究分析。研究发现规范计算方法的弯矩比有限元模拟的结果平均大约16%,剪力平均大约12%。图集给出的配筋和规范计算方法的配筋接近,ABAQUS有限元模拟的门框墙配筋略小于规范计算方法,可以根据有限元软件对不同类型的门框墙进行模拟分析其实际受力情况,对门框墙的配筋进行适当的设计优化,提高人防结构设计的合理性。

The frame wall of civil air defense door is a reinforced concrete component used to support the protective door in civil air defense engineering.In the code for design of civil air defense basement,the door frame wall is calculated as a cantilever member,but the actual door frame wall is a flat plate with a hole under bending,so it is more reasonable to analyze the force according to the plate member with four edges.Taking the civil air defense basement of a loft garage as an example,this paper studies and analyzes the upper retaining wall of civil air defense door with different heights through the standard calculation method and ABAQUS finite element simulation method.It is found that the bending moment of the code method is about 16%and the shear force is about 12%more than that of the finite element simulation.The reinforcement given in the atlas is close to that of the standard calculation method.The reinforcement of the door frame wall simulated by ABAQUS finite element method is slightly less than that of the standard calculation method.According to the finite element software,different types of door frame walls can be simulated to analyze their actual stress,and the reinforcement of the door frame wall can be properly designed and optimized,so as to improve the rationality of the civil air defense structure design.