Determining equivalent-sectional shear modulus in torsion tests for laminated glass beams using photogrammetry method

This paper proposes a concise concept for quantifying the shear/torsional stiffness of laminated glass beams experimentally by introducing Equivalent-Sectional Shear Modulus (ESSM), that is directly measured from torque and sectional-rotation correlation with torsion test tailor-made photogrammetry technique. The advantage this method originated measuring overall rotation to response beam altogether rather than component individually. eliminates uncertainties analytical approximations are commonly adopted most existing methods in which composite shear/torsion derived its mechanical properties. technique increased accuracy sectional measurement acquiring dense displacement sample points on simultaneously. setup efficacy design were proven micrometre monolithic test. One each polyvinyl butyral (PVB) SentryGlas Plus (SGP) tested multiple times non-destructively determine ESSM. result SGP showed closer agreement previous studies, however PVB exhibited larger difference studies. It also suggested properties interlayer played an important role behaviour beam. experimental outcomes have demonstrated proposed accurate effective ESSM beams.