Behaviour of Structural Insulated Panels (SIPs) Subjected to Short-term Axial Loads
Jacques, E. and Makar, J.
ASCE Journal of Structural Engineering, Manuscript ID STENG-6860, ACCEPTED FOR PUBLICATION.
Abstract: Structural insulated panels, commonly known as SIPs, are a panelized building system composed of external facer panels, such as oriented strandboard (OSB) sheets, bonded to a lightweight foam core. As the demand for SIP panels increases as an alternative to light frame construction in residential and light-commercial buildings, so too does the need for proper design requirements to satisfy regulatory agencies and building officials. This paper describes a combined experimental and analytical study whose objective was to investigate the structural behavior of OSB-faced SIPs subject to short-term axial loading. A total of 53 panels with varying types of foam core, thickness, and other construction details were subjected to concentric and eccentric loading. The test results indicated that the strength of SIP panels was primarily influenced by the panel slenderness and the type of foam core. Reliability-based design expressions were developed for the ultimate limit state of SIPs subjected to short duration concentric and eccentric axial loading. The results were also compared to current allowable stress design practices. In addition to presenting important test data for researchers, this paper presents a number of practical design recommendations to improve the performance of SIPs.
Behavior of Structural Insulated Panels (SIPS) Subjected to Short-Term Out-of-Plane Transverse Loads
Jacques, E. and Makar, J.
Canadian Journal of Civil Engineering, Manuscript ID cjce-2018-0015, ACCEPTED FOR PUBLICATION.
Abstract: Structural insulated panels (SIPs) are a panelized building system composed of external oriented strandboard wood sheets bonded to a lightweight boardstock or pour-in-place foam core. This paper describes an investigation on the structural behaviour of OSB-faced SIPs subject to short-term out-of-plane transverse loading. A total of 35 panels with varying types of foam core, thickness and other construction details were subjected to partially distributed uniform loading. The results showed that the ultimate shear resistance of SIPs is proportional to the mechanical properties of the core, and inversely proportional to the thickness of the core. The observed relationship between core shear stress at failure and core thickness was used to calibrate a reliability-based design expression to predict the shear strength of full-size panels based on properties obtained from small-scale foam material tests. Sandwich panel theory can accurately predict the initial stiffness of SIPs when behaviour remains in the linear range. Finally, recommendations regarding panel design and construction are made to improve the shear behaviour of SIPs.