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首页> 外文期刊>International journal of steel structures >Behaviour of Concrete-Filled Double-Skin Circular Hollow Section Cross Joints Under Axial Compression
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Behaviour of Concrete-Filled Double-Skin Circular Hollow Section Cross Joints Under Axial Compression

机译：轴向压缩下的混凝土双壁空心圆形截面截面节点的行为

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摘要

This paper presents an experimental investigation on concrete-filled double-skin circular hollow section (CHS) cross joints under axial compression. A total of twenty-two right-angled CHS cross joints with different brace to chord diameter ratio (beta), inner tube to outer tube thickness ratio of chord (omega) and hollow ratio of chord (chi) were tested, in which eighteen concrete-filled double-skin CHS cross joints were studied for different shapes of inner tube of chord, two traditional empty CHS cross joints and two traditional concrete-filled CHS cross joints were tested for comparison. The joint strengths, failure modes, load-deformation curves and strain distribution curves of all specimens are reported. The effects of brace to chord diameter ratio (beta), inner tube to outer tube thickness ratio of chord (omega), hollow ratio of chord (chi), shape of inner tube of chord and concrete strength on the behaviour of concrete-filled double-skin CHS cross joints under axial compression were evaluated. It is shown from the comparison that the ultimate load and initial stiffness of CHS cross joints are significantly enhanced by strengthening the chord member with inner tube and concrete infill. Furthermore, the ultimate strengths are increased with the increase of the beta ratio, whereas the ultimate strengths are decreased with the increase of the chi ratio for all types of concrete-filled double-skin CHS cross joints. On the other hand, the ultimate strengths are enhanced with the increase of the omega ratio and concrete strength for all types of concrete-filled double-skin CHS cross joints, but the enhancement is insignificant. The corresponding finite element analysis was also performed and calibrated against the test results. The design equations are proposed based on the test and finite element analysis results for concrete-filled double-skin CHS cross joints, which are verified to be more accurate.
机译：本文提出了在轴向压缩下填充混凝土的双层圆形空心截面（CHS）十字接头的实验研究。总共测试了22个直角CHS十字形节点，它们具有不同的支撑与弦直径比（beta），内管与外管的弦厚比（omega）和弦的空心比（chi），其中十八个混凝土针对不同形状的弦内管，研究了实心双​​填充CHS十字形接头，并测试了两个传统的空CHS十字形接头和两个传统的混凝土填充CHS十字形接头以进行比较。报告了所有试件的接头强度，破坏模式，载荷-变形曲线和应变分布曲线。支撑与弦直径之比（β），弦的内管与外管厚度之比（Ω），弦的中空比（chi），弦的内管形状和混凝土强度对双层混凝土性能的影响评估了在轴向压缩下的皮肤CHS交叉接头。从比较中可以看出，通过用内管和混凝土填充物加固弦杆构件，可以显着提高CHS十字接头的极限载荷和初始刚度。此外，对于所有类型的混凝土填充双表层CHS交叉节点，极限强度随β比的增加而增加，而极限强度随chi比的增加而减小。另一方面，对于所有类型的混凝土填充双表层CHS十字接头，随着Ω比和混凝土强度的增加，极限强度得到了增强，但是这种增强是微不足道的。还进行了相应的有限元分析，并根据测试结果进行了校准。根据试验结果和有限元分析结果，提出了混凝土双面板CHS十字形节点的设计方程，经验证，该方程更为精确。

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