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Performance of a hybrid GFRP-concrete beam subject to low-velocity impacts

机译：混合GFRP混凝土梁在低速冲击下的性能

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摘要

In the present study, the impact behaviour of a hybrid beam consisting of a rectangular hollow GFRP pultruded profile filled with concrete is studied. The hollow pultruded GFRP box profile not only provides tensile strength but also protects the concrete block inside from suffering chemical attacks. The concrete on the other hand provides the system with bulk size and structural stability. A series of beams were subjected to low-velocity impacts by using a high capacity drop weight machine. A nonlinear finite element model was developed and calibrated to analyse the failure of the beams. In particular, it was used to reveal the failure modes, the cracking pattern, and damage sequences within the concrete hidden inside the pultruded profile. The calibrated finite element model was subsequently used to analyse hybrid beams of similar size to prestressed concrete railway sleepers. The numerical simulations revealed that in terms of the maximum load, the hybrid beam outperforms the prestressed concrete sleeper. Indeed, if the proposed beam is to be used as a railway sleeper, it needs to display better or equal dynamic properties to existing railway sleepers.
机译：在本研究中，研究了由矩形空心GFRP拉挤型材填充混凝土组成的混合梁的冲击性能。中空拉挤的GFRP箱形轮廓不仅可以提供抗张强度，还可以保护内部的混凝土砌块免受化学侵蚀。另一方面，混凝土为系统提供了体积大小和结构稳定性。通过使用高容量落锤机，一系列的梁受到了低速冲击。建立并校准了非线性有限元模型以分析梁的破坏。特别是，它用于揭示拉挤型材内部隐藏的混凝土中的破坏模式，开裂模式和破坏顺序。随后使用校准的有限元模型来分析与预应力混凝土轨枕尺寸相似的混合梁。数值模拟表明，就最大载荷而言，混合梁的性能优于预应力混凝土轨枕。实际上，如果提议的梁要用作铁路枕木，它需要显示出与现有铁路枕木更好或更相等的动态特性。

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