This paper describes the design of a novel semi-prefabricated LVL-concrete composite floor that has been developed in New\r\nZealand. In this solution, the floor units made from LVL joists and plywood are prefabricated in the factory and transported to the\r\nbuilding site. The units are then lifted onto the supports and connected to the main frames of the building and to the adjacent units.\r\nFinally, a concrete topping is poured on top of the units in order to form a continuous slab connecting all the units. Rectangular\r\nnotches cut from the LVL joists and reinforced with coach screws provide the composite action between the concrete slab and the\r\nLVL joists. This system proved to be an effective modular solution that ensures rapid construction. A design procedure based on the\r\nuse of the effective flexural stiffness method, also known as the ââ?¬Å?gamma methodââ?¬Â is proposed for the design of the composite floor\r\nat ultimate and serviceability limit states, in the short and long term. By comparison with the experimental results, it is shown\r\nthat the proposed method leads to conservative design. A step-by-step design worked example of this novel semi-prefabricated\r\ncomposite floor concludes the paper
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