Abstract
A new type of steel-wood composite component—prestressed high strength glue-lumber beam was developed by using self-developed screw jacking stretching equipment, bending test of a total of 9 glue-lumber beams were conducted, bending performance of glue-lumber beam was studied from the level of material selection.
Material type (?c level SPF, ?c level SPF, poplar, northeast larch), layer plate thickness, lamina lay-ups typewere adjusted to study bending elastic modulus, ultimate bearing capacity and failure modes. Compared to imported ?c level SPF timber, ultimate bearing capacity and bending elastic modulus of glue-lumber beammade of northeast larch were respectively increased by 86.18% and 69.48%; bending bearing capacity of glue-lumber beam made of northeast larch was higher, bending performance had a certain increasing trend with decrease of layer plate thickness, effect of interval layout of lamina lay-ups type was better; after prestressed, glue-lumber beam showed characteristics of plastic failure obviously when it was destroyed, self- developed screw jacking prestressed stretching equipment was easy to operate, and had better prospect of practical application.
