动态荷载作用下混凝土破裂的数值模拟

Numerical Simulation on Spalling of Concrete under Dynamic Loading

关键词:  混凝土  应力波  剥落破裂  动态强度  数值模拟

Key words:  concrete,stress wave,spalling failure,dynamic strength,numerical simulation

摘要:

简单介绍了材料破裂过程分析(MFPA)程序模拟混凝土动态破裂过程的基本原理.用MFPA程序模拟了非均质混凝土在静态和动态应力作用下的破裂过程,给出了不同应力波幅值时试样的破裂模式,并探讨了应力波幅值和应力波作用时间对混凝土破裂模式的影响.数值模拟结果表明,动态荷载作用下混凝土的破裂过程受控于应力波传播及其诱发损伤的过程,混凝土材料力学性能的非均质性是造成其动态强度提高的原因之一.

Abstract:

The principle of material failure process analysis(MFPA) code to simulate dynamic failure of concrete are briefly summarized.MFPA code was used to simulate the failure process of concrete under static and dynamic loading,and the different spalling patterns of concrete under dynamic stress waves with different amplitudes and different durations were captured and the(associated) mechanisms were clarified.The numerical simulations indicate that the failure process of concrete under dynamic loading is controlled by the stress wave propagation as well as its induced damage,and the heterogeneity is one of factors that leads to the increase of dynamic strength of concrete.