Modified creep and shrinkage prediction model B3 for serviceability limit state analysis of composite slabs

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• 作者：Alireza Gholamhoseini
• 关键词：Composite slabs ; Creep ; Deflection ; Profiled steel decking ; Serviceability ; Shrinkage
• 刊名：International Journal of Advanced Structural Engineering (IJASE)
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：8
• 期：1
• 页码：87-101
• 全文大小：1,472 KB
• 刊物主题：Building Construction;
• 出版者：Springer Berlin Heidelberg
• ISSN：2008-6695

文摘

Relatively little research has been reported on the time-dependent in-service behavior of composite concrete slabs with profiled steel decking as permanent formwork and little guidance is available for calculating long-term deflections. The drying shrinkage profile through the thickness of a composite slab is greatly affected by the impermeable steel deck at the slab soffit, and this has only recently been quantified. This paper presents the results of long-term laboratory tests on composite slabs subjected to both drying shrinkage and sustained loads. Based on laboratory measurements, a design model for the shrinkage strain profile through the thickness of a slab is proposed. The design model is based on some modifications to an existing creep and shrinkage prediction model B3. In addition, an analytical model is developed to calculate the time-dependent deflection of composite slabs taking into account the time-dependent effects of creep and shrinkage. The calculated deflections are shown to be in good agreement with the experimental measurements.