Residual strength of timber-concrete composite beams after long-term test

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Conference Proceeding
From Materials to Structures: Advancement Through Innovation - Proceedings of the 22nd Australasian Conference on the Mechanics of Structures and Materials, ACMSM 2012, 2013, pp. 73 - 78
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This paper presents a comprehensive serviceability investigation that commenced at the University of Technology, Sydney, in August 2010. The tests have been conducted on two 5.8 m span timber concrete composite beams (referred to as TCC beams here onwards) with two different connector types: Type 17 screws and four notches with coach screws. The materials used are laminated veneer lumber (LVL) for the beams and 32-MPa concrete for the flanges. Three serviceability tests were conducted on the beams, two short-term (quasi-static loading) and one longterm (sustained loading) tests. The short-term tests were completed before the start and after the end of the long-term test. Both short-term tests aim to identify the initial and residual stiffness respectively. The ultimate strength of the specimens was also investigated in the course of the last test. During the long-term test (duration of approximately 500 days), the specimens were under a sustained load (1.7 kPa) whilst the environmental conditions were cyclically alternated between normal and very humid conditions - A typical cycle duration was six to eight weeks. The temperature remained quasi constant (22°C). The mid-span deflection, LVL-beam EMC and relative humidity of the air were continuously monitored during the test. This test aim to quantify the creep effect of the TCC beams. The paper starts with a brief literature review, continues with a presentation of the laboratory investigations and then presents a thorough discussion and analysis of the long-term and short-term investigations. © 2013 Taylor & Francis Group.
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