Design Procedure for Web Core Sandwich Panels for Residential Roofs

Abstract

Panelized construction of residential buildings is gaining popularity due to the architectural and energy efficiency benefits that can be achieved. An important challenge to the design of panel structures for buildings is the balance between long-term structural performance and the thermal insulating requirement. In this study, foam core and web core panels are designed for residential roofs. Both panels are comprised of two face sheets and an insulating foam core. In the web core panel, thin metal webs that connect the face sheets are added to improve panel shear stiffness and enable longer spans. A design procedure is developed that considers R-value, panel deflection, core shear failure, bearing failure, and buckling of the face sheets and webs. The buckling model includes the ability of the foam core stiffness to restrain the buckling deformation. Panel designs are presented that provide R-5.3 m 2 K/W for roof loads of 1500, 2000, and 3000 N/m 2 , corresponding to climate zones in the US. It is demonstrated that the web core panel can be designed for these structural and thermal requirements with unsupported span lengths as long as 7 m, while span lengths for foam core panels are limited to 4 m. Web shear buckling and R-value are the two performance criteria that limit panel span length and depth.

Two-scale micropolar plate model for web-core sandwich panels

“…This study is primarily motivated by all-steel web-core sandwich panels and ship structures. Nevertheless, such panels also show good potential for applications in bridges and buildings as evidenced by Smith (2004, 2007); Nilsson et al (2017) and Briscoe et al (2011). In addition, the methods presented in this paper should facilitate the structural analysis of GFRP sandwich panels in the future as well.…”

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

“…Rigid polyurethane foams (RPUFs) are widely used in a variety of industrial applications such as thermal insulation and construction of lightweight materials. Both the low density and high insulation value of RPUFs are excellent properties for the fabrication of industrialized sandwich panels to construct commercial, residential, and industrial buildings . Another relevant property of RPUFs is their excellent energy absorption capability .…”

Buckling of a Plate on a Pasternak Foundation Under Uniform in-Plane Bending Loads

“…This model is suitable for foundation materials with relatively great shear sti®ness, including relatively deep foundations. 4,13 For a plate with out-of-plane de°ection w, the Pasternak foundation o®ers a restoring forceq, given by 14…”

“…4 are indistinguishable from in¯nitely long plates. 4 The results reported in this work were therefore obtained using ¼ 4. Curves are shown corresponding to 2 f0; 1; 2g and two values for the ratio f W =f P : f W =f P : f W =f P ¼ 10 (typical of slender plates on an isotropic foundation), and f W =f P ¼ 15 (typical of slender plates and a foundation with E c % 2G c ).…”