冲击荷载作用下重晶石混凝土力学性能研究

发布时间：2018-07-02 09:10

本文选题：重晶石混凝土 + 应变率　；参考：《南华大学》2015年硕士论文

【摘要】：重晶石混凝土属于防辐射混凝土中的一种,具有屏蔽α、β射线等一些对生物有害射线的功能,因此经常被使用在国防、核电站、医院放射科等要求具有防辐射材料的工程中,而冲击荷载作用是此类工程的重要工况之一。为了了解冲击荷载作用下重晶石混凝土的力学性能,本文利用落锤试验并结合有限元分析进行研究。(1)通过实验得到了得到1.4s-1~4.0s-1应变率下的混凝土梁动力破坏过程,并测得荷载时程曲线、应变时程曲线、位移时程曲线、力位移曲线;(2)分析得知在重锤质量一定时,随下落高度增加,荷载速率、峰值荷载增加;下落高度一定时,随落锤质量增加,峰值荷载、竖向位移增加;(3)研究了1.4s-1~4.0s-1应变率下重晶石混凝土的动力增强系数;(4)用有限元分析软件ANSYS/LS—DYNA模拟计算了重晶石混凝土梁在不同冲击荷载作用下的力学行为。
[Abstract]:Barite concrete is a kind of radiation proof concrete, which has the function of shielding 伪, 尾 ray and other harmful biological radiation, so it is often used in national defense, nuclear power station, hospital radiology department and so on. The impact load is one of the important working conditions of this kind of engineering. In order to understand the mechanical properties of barite concrete under impact load, the dynamic failure process of concrete beams under 1.4s-1~4.0s-1 strain rate is obtained by using drop weight test and finite element analysis. The load time history curve, strain time history curve, displacement time history curve, force displacement curve are obtained. (2) when the weight of the hammer is constant, the load rate and peak load increase with the drop height, and when the falling height is constant, the load rate and peak load increase. With the drop weight increasing, the peak load, The vertical displacement increases; (3) the dynamic enhancement coefficient of barite concrete at 1.4s-1~4.0s-1 strain rate is studied; (4) the mechanical behavior of barite concrete beams under different impact loads is simulated by the finite element analysis software ANSYS- LS-DYNA.
【学位授予单位】：南华大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.35

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