连续增幅冲击下混凝土板动态效应分析

Analysis of dynamic effects of concrete slabs under continuous amplitude impacts

为了研究连续增幅冲击下混凝土板的动态效应,采用LS-DYNA显式动力分析程序对素混凝土板进行了3次连续增幅冲击数值模拟试验,分析了混凝土板的破坏模式、系统能量时程曲线和挠度时程曲线。结果表明:在连续增幅冲击下,混凝土板的损伤面积逐次增大,斜裂缝的深度和宽度随之扩大,冲击响应变得更加复杂,破坏模式也变得更加难以预测;随着冲击次数的增加,混凝土板不断吸收能量,但在严重损伤后,其吸能能力会减弱;在连续增幅冲击下,混凝土板表现出明显的弹性和塑性行为。

In order to study the dynamic effects of concrete slabs under continuous amplitude impacts,three continuous amplitude numerical simulation tests were conducted on plain concrete slab by using the LS-DYNA.The failure modes,system energy time-history curves and deflection time-history curves of the concrete slab were analyzed.The results show that under continuous amplitude impacts,the damage area of the concrete slab gradually increases,the depth and the width of the oblique cracks expand,the impact response becomes more complex and the failure modes become more difficult to predict.With the increase of impact times,the concrete slab continuously absorbs energy,but after severe damage,the energy absorption capacity would weaken.The concrete slab exhibits significant elastic and plastic behavior under continuous amplitude impacts.