The flexural behaviour of composite sandwich beams with a lattice-web reinforced wood core

In this study, the flexural behaviour of lattice-web reinforced composite sandwich beams was investigated. The innovative composite sandwich beams consisted of glass fibre reinforced composite materials as the surface layer and web, Paulownia wood and South Pine as the core material. While keeping the external size unchanged, 1, 2, 3, 4 and 5 wood cores were formed by the vacuum infusion process at one time, to develop a different number of lattice-webs. In addition, the wood beam was used as a control. A four-point bending test was carried out on all specimen beams. The equivalent bending stiffness, equivalent shear stiffness, mid-span deflection of the specimens and bearing capacity were analysed. There is a larger plateau stage in the latter part of the load-midspan deflection curve of the beams strengthened by the lattice-web, which means the beams had ductile failure characteristics. Furthermore, the type of wood core greatly influenced the flexural behaviour of the composite sandwich beam, and the optimum lattice-web number of the Paulownia specimen is 2, and that of the South Pine specimen is 3.

[1]  H. Fang,et al.  Flexural creep behavior of web reinforced GFRP-balsa sandwich beams: Experimental investigation and modeling , 2020 .

[2]  B. Qu,et al.  Testing of insulated sandwich panels with GFRP shear connectors , 2020 .

[3]  D. Fernando,et al.  Experimental investigation of a timber-concrete floor panel system with a hybrid glass fibre reinforced polymer-timber corrugated core , 2020 .

[4]  Syed Hassan Farooq,et al.  Improving structural performance of timber wall panels by inexpensive FRP retrofitting techniques , 2020 .

[5]  D. Fernando,et al.  Experimental investigation of a novel concrete-timber floor panel system with digitally fabricated FRP-timber hollow core component , 2019 .

[6]  D. Fernando,et al.  GFRP-to-timber bonded joints: Adhesive selection , 2019, International Journal of Adhesion and Adhesives.

[7]  Yu Bai,et al.  Connections and structural applications of fibre reinforced polymer composites for civil infrastructure in aggressive environments , 2019, Composites Part B: Engineering.

[8]  Yu Bai,et al.  Fiber reinforced composites sandwich panels with web reinforced wood core for building floor applications , 2018, Composites Part B: Engineering.

[9]  J. Teng,et al.  Hybrid fibre-reinforced polymer–timber thin-walled structural members , 2018 .

[10]  Yu Bai,et al.  Bending performance of GFRP-wood sandwich beams with lattice-web reinforcement in flatwise and sidewise directions. , 2017 .

[11]  A. Fam,et al.  The effect of foam core density at various slenderness ratios on axial strength of sandwich panels with glass-FRP skins , 2016 .

[12]  K. Chandrashekhara,et al.  Testing and Evaluation of Polyurethane-Based GFRP Sandwich Bridge Deck Panels with Polyurethane Foam Core , 2016 .

[13]  David Hui,et al.  Mechanical performance of innovative GFRP-bamboo-wood sandwich beams: Experimental and modelling investigation , 2015 .

[14]  H. Fang,et al.  Behavior of sandwich wall panels with GFRP face sheets and a foam-GFRP web core loaded under four-point bending , 2015 .

[15]  Yu Bai,et al.  Mechanical behavior of concrete-filled square steel tube with FRP-confined concrete core subjected to axial compression , 2015 .

[16]  N. Ayrilmis,et al.  Improving bending and tensile properties of lignocellulosic filled polypropylene composite panels using aramid fabric , 2014, Fibers and Polymers.

[17]  Sindu Satasivam,et al.  Mechanical performance of bolted modular GFRP composite sandwich structures using standard and blind bolts , 2014 .

[18]  N. Rahbar,et al.  Mechanical behavior of a glass fiber-reinforced polymer sandwich panel with through-thickness fiber insertions , 2014 .

[19]  Fernando A. Branco,et al.  GFRP sandwich panels with PU foam and PP honeycomb cores for civil engineering structural applications , 2012 .

[20]  Thiru Aravinthan,et al.  Flexural behaviour of glue-laminated fibre composite sandwich beams , 2010 .

[21]  Thiru Aravinthan,et al.  In-plane shear behaviour of fibre composite sandwich beams using asymmetrical beam shear test , 2010 .

[22]  Thiru Aravinthan,et al.  Flexural behaviour of structural fibre composite sandwich beams in flatwise and edgewise positions , 2010 .

[23]  Deng Zong-bai.  Research on Equivalent Modulus of Sandwich Core Plane for Rectangular Fill Materials Use Energy Method , 2009 .

[24]  Keith Crews,et al.  Timber Stressed-Skin Panels: Design Guidelines for Australian Practice , 2009 .

[25]  Jin-Guang Teng,et al.  Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites , 2008 .