单板层积梁弯曲破坏的试验研究与分析

在万能力学试验机上测试由高频热压方法制造的桦木和椴木单板层积梁的密度、静曲强度(MOR)、弹性模量(MOE)和水平剪切强度等力学性质;讨论LVL(单板层积材)梁受弯曲、水平剪切载荷时的主要破坏形式并得出相关结论。测试结果表明,在该试验条件下,桦木和椴木LVL梁具有较大的密度、MOR和较高的MOE。其主要物理力学性能受树种的影响较大,桦木LVL梁的主要性能均优于椴木LVL梁。当LVL梁受弯曲破坏时,其主要破坏形式为整体断裂破坏、开裂破坏以及混合破坏等3种;受水平剪切应力破坏时,以基材剪切破坏和胶层剪切破坏两种形式为主。

Testing Study and Analysis on Flexural Failure of LVL Beams

Mechanical properties including the density MOR, MOE, shearing strength of birch and LVL beams made by the high-frequency hot press were tested by universal strength testing machine. The primary failure modes were discussed when LVL beams suffered the flexural and level sheafing load. Relevant conclusions were drawn. The results show that the birch and basswood LVL beams have bigger density and MOR, upper MOE. The tree species have greater impact on primary physical and mechanical property of LVL beams, Birch LVL beams have better property than basswood LVL beams. When LVL beams suffer the flexural failure, it has three kinds of primary failure modes, including whole fracture failure, cracking failure and mixed failure. When suffering level shearing load failure, it has two kinds of primary failure modes, including base material shear failure and adhesive layer shear failure.