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考虑剪跨比、截面高宽比两个因素,设计14个侧压竹材集成材简支梁试件,对其力学性能进行试验研究,采用非接触式激光位移传感器和Vic-3D测试系统进行位移测量。结果表明:侧压竹材集成材梁经历弹性阶段、弹塑性阶段后,突然发生脆性断裂破坏;侧压竹材集成材简支梁试件的抗压弹性模量与抗拉弹性模量相等;试件截面平均应变符合平截面假定;试件中竹材的抗压强度没有得到充分发挥;随着剪跨比的增大,试件的承载力下降较快,而梁截面宽度对承载力的影响较小。
Considering the factors of shear ratio and aspect ratio, 14 simple-supported bamboo composite timber specimens were designed and their mechanical properties were experimentally studied. Non-contact laser displacement sensors and Vic-3D test system were used for displacement. measuring. The results show that the unilaterally-compressed bamboo composite beam undergoes brittle fracture after elastic and elastoplastic stages. The compressive elastic modulus and tensile elastic modulus of the simply-supported bamboo composite timber are the same. The average cross-section strain agrees with the flat cross-section assumption; the compressive strength of the bamboo in the test specimen has not been fully exerted; with the increase of the shear-span ratio, the bearing capacity of the specimen decreases rapidly, and the beam width has little effect on the bearing capacity. .