Corrugated Wood Composite Panels For Structural Decking

E = modulus of elasticityR = modulus of ruptureI = moment of inertia about the neutral axis of the cross sectionS = section modulusSubscript, c = corrugated panelSubscript, f = flat panelThe theoretical relative stiffness and relative strength of corrugated panels can beestimated using only the four geometric variables if the material properties, such asmodulus of elasticity and modulus of rupture, are assumed to be the same for bothcorrugated and flat panels. As a result, the relative stiffness and relative strength becomeIthe ratio of c I andcfSS f, respectively.The moment of inertia for the corrugated section about its neutral axis, I c, can bewritten in terms of the four basic geometric variables.⎛ w h h ⎞ ⎛wh h h ⎞⎜⎟ ⎜⎟⎝12 2sin( θ) 2 tan( θ) ⎠ ⎝ 4 6sin( θ) 2 tan( θ)⎠2 3 33Ic= + − t + + − tThe moment of inertia calculated using equation (4) is for a complete wavelength ofcorrugation or over a width equal to w . The complete derivation of equation (4) can befound in Appendix A. On the other hand, the moment of inertia for the flat plate havingthe same thickness about its neutral axis, If, can be calculated using,(4)3wtIf= (5)12Assuming both the corrugated and the flat panels have the same MOE, the relativestiffness can be computed by taking the ratio of I cI f, using equations (4) and (5).10