爆炸荷载下高强钢筋加强混凝土梁抗弯性能

Research for flexural behavior of concrete beams with highstrength reinforcements under blast loading

为研究爆炸荷载作用下高强钢筋混凝土梁的抗弯性能,对不同钢筋强度的钢筋混凝土简支梁进行了爆炸试验,从构件的破坏形态、受力和变形特征分析了高强钢筋对试验简支梁抗弯性能的影响.结果表明:高强钢筋强度高的优势在爆炸荷载超过普通RC梁的屈服荷载后才能充分发挥.爆炸荷载较大时,裂缝数量较多的高强RC梁比普通RC梁具有更好的变形恢复能力,损伤程度显著减小.采用高强钢筋使得RC梁裂缝分布区域增大,在塑性变形阶段形成了梁长约60%的塑性区域,改变了RC梁塑性变形阶段的振型.

In order to research the flexural behavior of concrete beams with high-strength reinforcements under blast loading,explosion tests on simply supported reinforced concrete beams with different reinforcement strength were conducted.Based on the failure pattern,stress and deformation characteristics of the beams,analysis of the influence caused by high-strength reinforcements on flexural behavior were made.It is showed that the strength advantages of high strength reinforcements can be fully functioned under blast loading which exceeds the yield load of the ordinary RC beams.When the blast loading is rather large,compared with the ordinary RC beams,the high-strength RC beams with more cracks have better deflection restoring capacity and a small degree of damage.The high-strength reinforcements adopted in RC beams result in a large crack distribution area,which is approximately as long as 60% of the beam span during the stage of plastic deformation and can change the vibration mode of RC beams during the plastic deformation stage.