Through the reinforcement calculation of 6 nuclear and 6 common grade of protective airtight door,the paper illustrates double-layer and double-direction of protective airtight door and causes of plum-blossom binding rebar,and describe the calculation principle of steel in stress area,with a view to guide practice.%通过核6、常6级防护密闭门的配筋计算,说明了人防工程中防护密闭门双层双向配筋及布置梅花形拉结筋的原因,并介绍了受压区钢筋的计算原理,以指导实践。
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