低速冲击作用下混凝土板破坏效应试验研究

An experimental study on the damage effects of the concrete slabs under low-velocity impact

为探讨混凝土板在低速冲击作用下的破坏效应,利用落锤试验机对6组混凝土板进行试验研究,分析了不同冲击速度、混凝土板强度和长厚比对混凝土板冲击破坏效应的影响;采用高速摄像机记录了各个试件在冲击过程中裂缝的发生、发展直至破坏的全过程。试验表明:在冲击荷载下混凝土板的裂缝分布随冲击速度的提高向冲击点局部集中有明显趋势,在较高能量下混凝土板在冲击点附近发生冲切破坏;并且基于试验现象推导了考虑板结构整体变形的冲击力计算方法,与试验结果对比可知,该计算方法结果偏差在25%以内,该计算方法合理。

In order to investigate the damage effect of concrete slabs under low velocity impact,six groups of concrete slabs were tested by a drop hammer tester,and the effects of different impact velocities,concrete slab strength,and length-thickness ratio on the impact damage of concrete slabs were analyzed.A high-speed camera records the whole process of crack occurrence,development,and destruction of each test piece during the impact process.The test shows that under the impact load,the crack distribution of the concrete slab has a clear trend with the impact velocity increasing to the impact point.At higher energy,the concrete slab is punched and damaged near the impact point;and the board is deduced based on the experimental phenomenon.The calculation method of the impact force of the overall deformation of the structure was compared with the experimental results,which shows that the error of the calculation method are within 25%.