提高强冲击荷载作用下平板式防护门门框墙抗力的方法  

Measures for improving the resistance of a flatbed protective doorframe wall under intensive shock loading

作　　者：赵跃堂[1] 董晓鹏[1] 易义君 储程[1] 

机构地区：[1]中国人民解放军理工大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007

出　　处：《爆炸与冲击》2017年第3期487-495,共9页Explosion and Shock Waves

基　　金：国家自然科学基金项目(51478469)

摘　　要：在强冲击波荷载作用下门框墙转角处会产生明显的应力集中,影响门框墙体系甚至整个防护结构的安全。为解决该问题,提出在迎爆面门框墙和衬砌结合部位设置薄弱层的构造方法,从而减小冲击荷载引起的过大的拉应力。运用考虑了剪切变形的悬臂梁理论分析表明,梁端部约束刚度的变化可以影响结构的破坏形态以及结构的内力分布,降低端部的约束刚度可以有效降低端部区域的内力峰值,延缓结构发生破坏的时间。利用有限元模拟的方法,分析了在出入口门框墙位置设置薄弱层对门框墙动力响应和破坏规律的影响。分析结果表明,设置薄弱层可以有效降低门框墙转角处的应力,降低门框墙结构破坏的风险,进而提高门框墙的抗力水平。Intensive shock loading can lead to obvious stress concentration at the corner of a doorframe and jeopardize the safety of a doorframe wall and even the whole protective structure where it is in- stalled. To solve this problem, we proposed to install a weak layer between the doorframe and the lin- ing to reduce the excessive tensile stress, based on the cantilever beam theory that takes into account the shear deformation. The results show that, as the constraint stiffness of the beam end can influ- ence the structure＇s failure mode and distribution of the internal force, lowering the constraint stiffness of the beam end can reduce the peak value of the internal force and delay the failure time of the structure. Using the finite element method, we analyzed the influence of the weak layer on the dy- namic response and the failure mode of the doorframe. The results show that the weak layer can effec- tively reduce the stress of the doorframe＇s corner and the damaging effect of the doorframe wall structure so that the resistance of the doorframe can be improved.

关 键 词：门框墙 强冲击荷载 薄弱层 动力响应 

分 类 号：O383.2[理学—流体力学]