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针对不同的型钢保护层厚度、剪跨比、型钢形式以及有无抗剪键这四个因素,对6根蜂窝型钢高性能混凝土梁和1根实腹型钢高性能混凝土梁进行静载试验,以此来探讨这种新型结构的受力性能。试验结果表明:蜂窝型钢高性能混凝土梁符合平截面假定;梁在剪跨比λ≥1.5时的破坏可分为弯剪破坏、剪切劈裂破坏、一般弯曲破坏与弯曲劈裂破坏四种形态;蜂窝型钢高性能混凝土梁的黏结滑移性能明显优于实腹型钢高性能混凝土梁;在蜂窝型钢中加入抗剪键对梁的极限承载力、黏结滑移及挠度变化影响不大;蜂窝型钢高性能混凝土梁的刚度比扩张前的实腹型钢高性能混凝土梁的刚度大,且延性要好;型钢保护层厚度对梁的极限承载力影响较大;梁的极限承载力及开裂荷载与剪跨比有关,具体表现为随着剪跨比的减小而变大。研究将为蜂窝型钢高性能混凝土梁的相关计算理论及工程应用提供参考。
According to the different thickness of steel section, shear span ratio, the form of steel and the presence or absence of shear bond, six honeycomb steel high performance concrete beams and one solid belly steel high performance concrete beam were subjected to static load test This to explore the new structure of the force performance. The experimental results show that the honeycomb steel high-performance concrete beam complies with the assumption of flat section. The failure of beams with shear span ratio λ≥1.5 can be divided into four forms: bending shear failure, shear splitting failure, normal bending failure and bending splitting failure . The bond-slip properties of honey-comb steel high-performance concrete beams are obviously better than that of the solid-belted steel high-performance concrete beams. The addition of shear bond to the honeycomb steel has little effect on the ultimate bearing capacity, bond slip and deflection of the beam. The stiffness of high-performance concrete beams is larger than that of the actual belly-steel high-performance concrete beams before expansion, and the ductility is better. The thickness of section steel has a great influence on the ultimate bearing capacity of beams. The ultimate bearing capacity, Than the specific performance as the shear-span ratio decreases. The research will provide a reference for the related calculation theory and engineering application of honeycomb steel high performance concrete beam.