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原文传递 Static Modeling of Plywood-Polyurethane Structural Insulated Panels in Bending

题名：	Static Modeling of Plywood-Polyurethane Structural Insulated Panels in Bending
正文语种：	eng
作者：	Cox, Nathaniel, I;Hamel, Scott E.
作者单位：	PDC Engineers 2700 Gambell St Suite 500 Anchorage AK 99503 USA;Univ Alaska Anchorage Dept Civil Engn 3211 Providence Dr 301S Engn & Ind Bldg Anchorage AK 99508 USA
摘要：	Structural insulated panels (SIPs) are thermally efficient, prefabricated structural elements that expedite on-site construction with a minimal number of skilled workers. This research aimed to model the time-independent mechanical response of transversely loaded SIPs with plywood skins and a closed-cell rigid polyurethane foam core. The foam core was characterized in both shear and compression through experimental testing, and a trilinear strain-based constitutive model was found suitable for the shear, while a linear response was adequate for compression. Two models, one analytical the other numerical, were produced using the component behavior and validated by comparison to the results of full-scale SIPs experimentally tested in quarter-point bending at two spans, 2.40 and 3.65 m. The analytical model is based on thin-faced, antiplane-core sandwich beam theory, while the numerical model is a two-dimensional plane-strain finite-element model (FEM). Good agreement was found between the analytical model and full-scale bending tests. However, it was found that the experimentally observed polyurethane shear moduli had to be reduced to 77% of their original values to provide good agreement of the FEM with the full-scale bending tests. While both models accurately predicted the bending deflection of the panels, neither was able to satisfactorily predict ultimate strength. (C) 2020 American Society of Civil Engineers.
出版年：	2021
期刊名称：	Journal of Structural Engineering
卷：	147
期：	2
页码：	04020334.1-04020334.11