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为了研究钢纤维混凝土动态拉伸强度和应变率效应,利用分离式霍普金森压杆(SHPB)试验装置,采用加速度计取代贴应变片的方法消除应力波弥散和衰减的影响,在试件末端安装加速度计记录试件自由面的加速度,然后根据加速度积分得到的速度,基于一维应力波理论计算得到SFRC的层裂强度。试验结果表明,采用加速计进行层裂强度测试计算,方法简单,结果可靠,且在101~102s-1的应变率范围内,钢纤维混凝土具有明显的应变率效应。
In order to study the dynamic tensile strength and strain rate effects of steel fiber reinforced concrete, the effect of dispersion and attenuation of stress waves was eliminated by using a split Hopkinson pressure bar (SHPB) test device and accelerometer instead of strain gauges. The accelerometer is installed to record the acceleration of the free surface of the specimen, and then the spall strength of the SFRC is calculated based on the one-dimensional stress wave theory according to the speed of the acceleration integration. The test results show that the method is simple and reliable, and the strain rate effect of steel fiber reinforced concrete is obvious in the range of 101 ~ 102s-1 strain rate.