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Overload damage mechanisms of GFRP-RC beams subjected to high-intensity low-velocity impact loads

机译：高强度低速冲击载荷的GFRP-RC光束过载损伤机制

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摘要

This paper investigates the overload capabilities and damage mechanisms of Glass Fiber Reinforced Polymer (GFRP) bar reinforced concrete beams subject to high-intensity low-velocity impact loads. The overload condition of the beam is defined as the capability of the beam to sustain input impact energy exceeding its quasi-static energy absorption capacity. Nine GFRP bar reinforced concrete (GFRP-RC) beams were tested under three levels of increasing input impact energy. The shear capacities of the beams were varied by using three spacings of the shear reinforcement. The midspan deflection histories, impact loads, reaction forces, and accelerations of the beams were measured. The crack patterns and failure modes were recorded and analyzed using a high-speed video camera. It was found that the beam shear capacity significantly influenced the type of cracks and the development of cracks under increasing levels of impact energy. Flexural and flexure-shear cracks were observed in the beams with higher shear capacities whereas shear cracks were observed in the beams with lower shear capacities. It was also found that higher beam shear capacities led to reduced residual midspan deflections and higher residual load carrying capacities of the beams. Design recommendations are provided for GFRP-RC beams subjected to high-intensity low-velocity impact events.
机译：本文研究了玻璃纤维增​​强聚合物（GFRP）钢筋混凝土梁的过载能力和损伤机制，其受高强度低速冲击载荷。光束的过载情况被定义为光束以维持输入冲击能量超过其准静态能量吸收能力的能力。在增加输入冲击能量的三个水平下测试九个GFRP钢筋混凝土（GFRP-RC）梁。通过使用剪切增强件的三个间隔来改变梁的剪切容量。测量了梁的中坡偏转历史，冲击载荷，反作用力和加速度。使用高速摄像机记录和分析裂缝图案和故障模式。发现光束剪切容量显着影响裂缝的类型和裂缝的发展，在增加的冲击能量下。在具有更高剪切容量的梁中观察到弯曲和挠曲剪切裂缝，而在具有较低剪切容量的梁中观察剪切裂缝。还发现，较高的光束剪切容量导致剩余的中空偏转和梁的较高的剩余负载承载能力降低。为高强度低速影响事件进行的GFRP-RC光束提供了设计建议。

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