爆炸荷载下钢筋混凝土梁的试验研究和破坏形态

Experiment Research and Failure Modes Analyses of RCBeams Under Blast loading

摘要:

随着世界范围内各类恐怖爆炸事件的频繁发生,工程师们开始认识到提高结构构件的抗爆能力,可以有效防止结构在爆炸荷载下引起的整体倒塌,在危机时刻为人员逃生争取更多的时间.通过对三根两端铰接低配箍钢筋混凝土梁在爆炸荷载作用下的力学性能进行试验研究,分析了梁的裂缝、应变和挠度变化情况,发现梁的破坏首先从薄弱处开始,通过提高混凝土强度和增大配箍率,尤其是对构件两端进行箍筋加密,能有效提高梁的抗爆能力.

关键词:钢筋混凝土梁; 爆炸荷载; 裂缝; 应变; 挠度

Abstract:

With frequent occurrence of all kinds of terrorism attack around the world,engineers begin to realize that improvement of antiblast of structural members can effectively prevent structure from integral collapse under blast loading and spare more time for people to escape.Studies are made of the mechanical performance of three simple supported RCBeams with fewstirrups under blast loading through experiments and analyses are made of their crack development,strain and deflection change.Results show that the beams begin to fail from the weak part and their antiblast can be effectly enhanced by increasing strength of concrete,enlarging Stirrup Ratio,and especially by reducing stirrup spacing of the two bottoms.

Key words:reinforcing concrete beams; blast loading; crack; strain; deflection