Abstract This paper studies the shear strength and load-slip behaviours of a recently developed novel steel-concrete composite flooring system (PUSS) with two different types of shear connectors while also using lightweight concrete. PUSS consists of a T-ribbed lightweight concrete floor and C-channel steel edge beams. The proposed shear connection system is using either web-welded shear studs only, or combined with horizontally lying steel dowels. This unique system further minimises its structural depth and results in ultra-shallow floors. Eight full-scale push-out tests were conducted to investigate the connection under the direct shear force with three different concrete types (normal concrete, lightweight and ultra-lightweight concretes) and two different shear connection systems (web-welded shear studs only and horizontally lying steel dowels together with web-welded shear studs). Three types of failure were recorded from the push-out tests; shear failure with bending near the roots of the connectors, shear failure of the weld toe of shear studs, and concrete cracking. Among the conclusions, it was validated that the compressive strength of the concrete significantly influences the ultimate shear strength capacity loads while it is influencing the failure mode of the connection. The failure mechanisms of the shear connectors were extensively studied, which led to the development of a calculation method for the shear strength and load–slip behaviours of the new connectors embedded in lightweight concrete. The analytical results are compared with those predicted by modern codes of practices and available methods from the literature. It is concluded that the proposed formulae offer a reliable prediction.

中文翻译：

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具有 LWC 的预制板的剪切连接 - 第 1 部分：实验和分析研究

摘要 本文研究了最近开发的新型钢-混凝土复合地板系统 (PUSS) 的剪切强度和荷载滑移行为，该系统具有两种不同类型的剪力连接件，同时还使用轻质混凝土。PUSS 由 T 型肋轻质混凝土地板和 C 型槽钢边梁组成。建议的剪力连接系统要么仅使用腹板焊接剪力钉，要么与水平放置的钢销钉结合使用。这种独特的系统进一步最大限度地减少了其结构深度，并产生了超浅的地板。进行了八次全尺寸推出试验，以研究三种不同混凝土类型（普通混凝土、轻质和超轻质混凝土）和两种不同的剪力连接系统（仅限腹板焊接剪力钉和水平放置的钢销钉与腹板焊接剪力钉）。从推出测试中记录了三种类型的故障；连接件根部附近发生弯曲的剪切破坏、剪力钉焊趾的剪切破坏和混凝土开裂。在这些结论中，验证了混凝土的抗压强度显着影响极限抗剪强度承载力，同时影响连接的破坏模式。对剪力连接件的失效机制进行了广泛的研究，从而开发了一种计算方法，用于计算嵌入轻质混凝土中的新型连接件的抗剪强度和荷载滑移行为。将分析结果与现代实践规范和文献中的可用方法预测的结果进行比较。得出的结论是，所提出的公式提供了可靠的预测。