冲击载荷下陶粒混凝土拉伸性能测试研究

发布时间：2018-03-12 10:20

本文选题：陶粒混凝土　切入点：分离式霍普金森压杆　出处：《工业建筑》2017年10期 　论文类型：期刊论文

【摘要】：采用分离式霍普金森(Hopkinson)压杆,结合高速摄影技术对陶粒混凝土圆盘试样进行冲击劈裂试验。用直径为20.0 mm、厚0.5 mm的黄铜圆片作为波形整形器将入射波上升时长延长到约为波在试样中传播用时的2倍。在不同加载率下,对陶粒体积分数不同的圆盘试样进行冲击加载,高速摄影记录到试样的破坏规律,验证了分离式霍普金森压杆巴西劈裂试验结果的正确性。数据分析结果表明:陶粒混凝土中陶粒含量越高,抗拉强度越低;试验时陶粒混凝土受确定的应变率加载,抗拉强度随加载应变率的增大而增大。贴在圆盘试样中心区域的电阻应变片测量到陶粒混凝土破碎时应变约为0.34%。
[Abstract]:The split Hopkinson-Hopkinson pressure bar is used. The impact splitting test of ceramsite concrete disk specimen was carried out by using high-speed photography. Using a brass disc with a diameter of 20.0 mm and a thickness of 0.5 mm as a corrugated shaper, the rising time of incident wave was extended to about the time of wave propagation in the sample. At different loading rates, The disc specimens with different volume fraction of ceramsite were subjected to impact loading, and the failure law of the specimens was recorded by high-speed photography. The results of Brazilian splitting test of split Hopkinson compression bar are verified. The results of data analysis show that the higher the content of ceramsite in the concrete, the lower the tensile strength, the higher the strain rate of the concrete, the lower the tensile strength, and the higher the content of ceramsite in the concrete, the lower the tensile strength. The tensile strength increases with the increase of strain rate. The strain of ceramsite concrete is about 0.34 when measured by the resistive strain gauge attached to the center of the disc specimen.
【作者单位】：宁波大学机械工程与力学学院;华南理工大学土木与交通学院;
【基金】：国家自然科学基金资助项目(11272165,10972109)
【分类号】：TU528.2

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