化爆作用下人防工程口部封堵梁的计算与分析

以典型口部封堵梁为例，对其在普通爆破弹爆炸作用下的响应进行计算与分析，动力有限元计算表明，按照抗核爆空气冲击波的要求设计的封,在化爆荷载作用下存在严重反弹现象，其载面负弯矩抗力明显不足，支座抗拉能力也显不足，建议梁的设计应采用对称配筋，并加密箍筋和增加焊角焊缝。

Calculation and Analysis of Beam for Blocking Entrance in Civil Air-defence Engineering under Conventional Weapon Explosion

The response of the beam for blocking entrance in civil air-defense engineering under the conventional weapon explosion is calculated and analyzed by taking a typical blocking beam as an example. Dynamic finite element analysis shows that the beam rebounds severely under the blast load induced by the low drag general purpose bomb and the resistance of the negative moment as well as the capacity to resist tensile force at the support is insufficient. The adoption of the symmetry reinforcement and the strenghening of the stirrup within 1/4 span near the support and the welding connection between the beam and support are suggested.