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Flexural behavior of concrete-filled aluminum alloy circular hollow section tubes

机译:铝合金混凝土空心圆截面管的抗弯性能

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This paper presents an experimental investigation on flexural behavior of concrete-filled aluminum alloy circular hollow section (CHS) tubes under pure in-plane bending. A total of 28 circular concrete-filled aluminum alloy tubes (CFAT) with nominal concrete cube strengths of 30 MPa and 50 MPa were tested. The flexural strengths, failure modes, flexural stiffness, ductility, bending moment versus mid-span deflection curves, overall vertical deflection curves, bending moment versus longitudinal strain curves and longitudinal strain distribution curves of circular CFAT beams are reported. It is demonstrated that the comparatively large wall thickness of aluminum alloy CHS tube enhanced the bearing capacity, the bending deformation capacity and the ductility of circular CFAT beams. Whereas, the concrete strength generally has insignificant influence on the flexural strength, flexural stiffness and ductility of circular CFAT beams. The current design specifications for the CFST are generally inappropriate for circular CFAT beams under pure in-plane bending with high scatter of predictions. Further research is still required to propose accurate design rules for circular CFAT beams. (C) 2017 Elsevier Ltd. All rights reserved.
机译:本文提出了在纯面内弯曲条件下,混凝土填充铝合金圆形空心截面(CHS)管的弯曲行为的实验研究。总共测试了28条圆形混凝土填充铝合金管(CFAT),其标称混凝土立方强度分别为30 MPa和50 MPa。报告了圆形CFAT梁的弯曲强度,破坏模式,弯曲刚度,延性,弯矩与中跨挠度曲线,总垂直挠度曲线,弯矩与纵向应变曲线以及纵向应变分布曲线。结果表明,较大的铝合金CHS管壁厚可以提高圆形CFAT梁的承载能力,弯曲变形能力和延性。然而,混凝土强度通常对圆形CFAT梁的抗弯强度,抗弯刚度和延展性影响不大。 CFST的当前设计规范通常不适用于纯平面内弯曲且预测高度分散的圆形CFAT梁。仍需要进一步研究以提出用于圆形CFAT梁的准确设计规则。 (C)2017 Elsevier Ltd.保留所有权利。

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