高温后钢管RPC动态力学性能及数值模拟研究

发布时间：2018-04-04 13:52

  本文选题：钢管RPC　切入点：高温后　出处：《振动与冲击》2017年10期

【摘要】：采用φ74 mm分离式霍普金森压杆(Split Hopkinson Pressure Bar,SHPB)装置对30块高温后的钢管活性粉末混凝土(Reactive Powder Concrete-Filled Steel Tube,钢管RPC)进行了不同应变率的冲击压缩试验,得到了高温后钢管RPC的动态应力-应变关系和破坏形态。利用ANSYS软件模拟了钢管RPC截面温度场分布,然后根据加权平均法得到高温后钢管RPC的轴心抗压强度代表值,最后采用LS-DYNA软件模拟了高温后钢管RPC动态力学行为。结果表明,高温200~300℃后钢管RPC具有明显的应变率效应,经历高温作用后的钢管RPC仍保持较高的强度,较好的延性和整体性,变形能力有所增强。基于*MAT_CONCRETE_DAMAGE_REL3模型的数值模拟结果与试验结果吻合良好,能够较好预测高温后钢管RPC的动态峰值应力。
[Abstract]:The shock compression tests of 30 reactive Powder Concrete-Filled Steel tubes (RPCs) with high temperature were carried out by using a 蠁 74mm split Hopkinson Pressure Pressure SHPBs.The dynamic stress-strain relationship and failure mode of steel tube RPC after high temperature were obtained.The temperature field distribution of steel tube RPC section was simulated by ANSYS software, then the representative value of axial compressive strength of steel tube RPC after high temperature was obtained by weighted average method. Finally, the dynamic mechanical behavior of RPC after high temperature was simulated by LS-DYNA software.The results show that the steel tube RPC has obvious strain rate effect after high temperature 200 鈩，

本文编号：1710230