钢筋混凝土梁梁在冲击作用初期的惯性力分布

冲击荷载会对钢筋混凝土梁产生严重损伤，冲击破坏往往是冲击初期造成的。冲击初期（冲击力到达支座前）冲击力完全由惯性力抵抗，不同时刻的内力分布与惯性力的分布情况密切相关。对冲击荷载下的RC梁（Reinforced Concrete Beam）进行有限元模拟（ANSYS/LS-DYNA），分析了冲击初期RC梁的惯性力与内力分布情况。结果表明：冲击初期，冲击力以应力波的形式逐渐向支点传递，冲击力由静止点内梁的惯性力平衡；梁体的冲击力传导可分为三个阶段，即应力波沿梁高方向传导、沿梁长度方向传导与冲击力到达支座后；不同阶段的惯性力分布情况不同，且惯性力的分布影响梁体的剪力和弯矩以及梁的破坏形态。

Inertial Force Distribution of RC Beams at the Initial

Serious damage to reinforced concrete beams will be caused by the impact load, and the impact damage is often caused in the early stage of impact. At the initial stage of impact (before the impact force reaches the support), the impact force is completely resisted by the inertia force, and the distribution of internal force at different times is closely related to the distribution of inertia force. The finite element simulation (ANSYS / LS-DYNA) of RC beam under impact load is carried out, and the distribution of inertia force and internal force of RC beam at the initial stage of impact is analyzed. The results show that in the initial stage of impact, the impact force is gradually transferred to the fulcrum in the form of stress wave, and the impact force is balanced by the inertia force of the beam in the static point; the transmission of the impact force of the beam body can be divided into three stages, that is, the transmission of the stress wave along the height direction of the beam, the transmission along the length direction of the beam and the impact force after reaching the support; the distribution of the inertia force in different stages is different, and the distribution of the inertia force affects the beam body Shear and bending moment and failure mode of beam.