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首页> 外文期刊>International journal of impact engineering >Investigating the failure behaviors of RC beams without stirrups under impact loading
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Investigating the failure behaviors of RC beams without stirrups under impact loading

机译：研究无箍筋的RC梁在冲击载荷作用下的破坏行为

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This study visualizes the evolution of crack patterns for simply-supported RC beams under static and impact loadings using the techniques of DIC and high-speed camera. At relatively low impact velocity, we observe multiple flexural cracks developing in a progressive sequence from mid-span to supports. At relatively high impact velocity, we observe a shear plug initiated at loading point during early time before impact response reaching supports. The critical velocity for transition from flexural- to shear-failure mode varies from 6.9 to 8.4 m/s. Comparative analysis suggests the impact resistance is related to failure modes: The maximum impact force is controlled by global resistance of structure at flexural-failure mode, while it is controlled by local failure of materials at shear-failure mode. Finally, this study compares absorbed energy with impact velocity at flexural- and shear-failure modes. By increasing impact velocity, the results show that absorbed energy increases at flexural-failure mode, and decreases at shear-failure mode. The decreasing absorbed energy capacity is possibly caused by less plastic deformation of steel reinforcements in a more concentrated zone of shear plug at shear-failure mode.
机译：这项研究使用DIC和高速摄像头的技术可视化了在静载荷和冲击载荷下简单支撑的RC梁的裂纹模式的演变。在相对较低的冲击速度下，我们观察到从中跨到支撑的逐步发展的多个挠曲裂纹。在相对较高的冲击速度下，我们观察到在冲击响应达到支撑之前的早期，在加载点处启动了一个剪切塞。从弯曲破坏模式过渡到剪切破坏模式的临界速度在6.9至8.4 m / s之间变化。对比分析表明，抗冲击强度与破坏模式有关：最大冲击力在弯曲破坏模式下受结构的整体阻力控制，而在剪切破坏模式下受材料的局部破坏控制。最后，本研究比较了弯曲破坏和剪切破坏模式下的吸收能量与冲击速度。通过增加冲击速度，结果表明，吸收能在弯曲破坏模式下增加，而在剪切破坏模式下减少。吸收能容量的降低可能是由于在剪切破坏模式下，在剪切栓塞更集中的区域中钢筋的塑性变形较小所致。

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