中文摘要：

利用显式动力有限元程序ANSYS／LS—DYNA对钢筋混凝土梁在爆炸荷载作用下的动力响应进行数值模拟，混凝土采用LS—DYNA程序中提供的三维SOLID164单元和Mat—Holmquist—Johnson—Cook（HJC）混凝土累积损伤材料模型，钢筋采用BEAM161梁单元和等向随动强化材料模型（Mat—P1astic—Kinematic），建立离散式三维有限元计算模型。对不同配筋率钢筋混凝土梁在爆炸荷载作用下受力特性和破坏过程进行数值分析，计算中考虑了不同爆炸距离、炸药当量对结构动力响应的影响。基于LS—DYNA的数值模拟结果表明，钢筋混凝土梁在不同爆炸荷载作用下会发生不同程度的破坏，得到了影响梁破坏模式的主要影响因素，有关结论可为钢筋混凝土梁的抗爆设计及加固提供参考。

英文摘要：

Large-scale finite element procedure LS-DYNA was used to simulate the dynamic response of reinforced concrete （RC） beam under blast load. Element type SOLID164 and Holmquist-Johnson-Cook material model were applied to analyse the mechanical behavior of concrete, and tbe damage and strain rate effect were considered in this model. The element type BEAM161 and the isotropic and kinematic hardening plasticity material model were used to analyse the mechanical behavior of reinforcing bar. A three dimensional solid model was established for the RC beam. Different TNT equivalent weights and standoff distance were investigated and discussed. The numerical simulation results showed that the RC beam revealed different extents of damage under different blast loadings. The influences of the several factors were identified and a theoretical basis was provided for blast resistant design and retrofit of RC beam in the future.