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Experimental Research on the Eccentric Compression Performance of C-T Connection Joints in CFST Composite Segments
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摘要: 将C-T连接接头用于空心钢管混凝土组合管片中，以实现空心钢管混凝土组合管片的快速连接。为研究空心钢管混凝土组合管片C-T连接接头的受力性能与设计计算方法，进行6个C-T连接接头的偏心受压性能试验研究，其中包括3个单排C-T连接接头和3个双排C-T连接接头，主要考察管片接头形式、偏心率关键参数对接头偏压性能的影响规律。研究在不同参数下试件破坏形态、破坏模式、应力应变发展、承载能力、变形能力等受力性能。结果表明：在偏心荷载作用下，C-T连接接头表现出良好的受力性能，试件均为典型的偏心受压破坏，且随着偏心率的增加，试件的极限承载力逐渐降低。C-T连接接头具有良好的承载能力和刚度，适用于空心钢管混凝土组合管片的现场快速拼接施工。Abstract: The C-T connection joint is applied in the concrete-filled steel tube（CFST） composite segment to achieve rapid connection of the segment. In order to study the mechanical properties and design calculation methods of the C-T connection joint in CFST composite segments， experimental research was conducted on the eccentric compression performance of six C-T connection joints， including three single-row C-T connection joints and three double-row C-T connection joints. The study primarily investigated the influence of segment joint forms and key eccentricity parameters on the eccentric compression performance of the joints.The experimental study focused on the failure morphology， failure mode， stress-strain development， bearing capacity， deformation capacity， and other mechanical properties of the specimens under different parameters. The results showed that under eccentric loading， the C-T connection joints exhibited favorable stress performance. The specimens experienced typical eccentric compression failure， and their ultimate bearing capacity gradually decreased as eccentricity increased. The C-T connection connection joints exhibited excellent bearing capacity and stiffness， making them suitable for on-site rapid assembly of CFST composite segments.
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