EVALUATION OF IN-PLANE SHEAR STRENGTH OF CLT BASED ON THE REAL SIZE HORIZONTAL LOADING SHEAR TEST

The effect of species of laminae on in-plane shear strength

Abstract

 Regarding the in-plane shear strength of CLT, the authors proposed the modified formula CLT beam proposed by M.Flaig et al³⁾. The equation of shear strength proposed by M.Flaig well matched to the test results that performed by Japanese cedar CLT. To apply that for the other species, Japanese larch and Sakhalin fir were used as specimen, here, and in-plane shear strain distribution along the cross section were measured to study about shape factor of CLT.

 The experimental investigations described below include torsional shear test with CLT block and rolling shear test with inner layer. The series of these were performed in order to determine the torsional and rolling shear strengths of glued layer. Series of test, three species, Japanese Larch, Japanese Cedar and Sakhalin Fir were intended to investigate the relationship between strength and density.

 These two strengths were required to obtain the in-plane shear strength of CLT panel. The other required strength, shear strength of parallel and perpendicular to the grain direction of laminae, were referred to Japanese Standard.

 Experimental methods of in-plane shear for panels were developed with several methods. We adopted horizontal loading test with real size two rail shear method. Cross laminated timber panel were cut in H shape. Middle narrow part was intended to deform shear and the others were no-deformation area. Experimental and calculated values generally show good agreement.