箱形型钢混凝土梁复合受扭性能试验

Experimental research on combined torsional behavior of box-shaped steel reinforced concrete beams

通过5根箱形型钢混凝土梁的复合受扭性能试验,详细描述了试件在不同扭弯比作用下的加载过程。试验表明,箱形型钢混凝土梁在复合受力情况下,出现扭转型或弯曲型两种破坏形态;扭弯比是影响弯、扭破坏形态的重要因素;适当的弯矩存在能显著提高型钢混凝土梁的抗扭强度。通过对试验数据分析得到的箱形型钢混凝土梁的弯扭相关方程,可为其设计提供参考和依据。

After experimental research on five box-shaped steel reinforced concrete（BSRC） beams under combined bending and torsion,the loading processes of the test members under different torsion-bending moment ratios were described in detail.Test and analysis results indicate that two failure modes（torsional failure mode and bending failure mode） may happen when BSRC beams are subjected to combined bending and torsion,the torsion-bending moment ratio is the key factor that decides the failure mode,and the ultimate torsion moment can be increased significantly by the existence of an appropriate bending moment.A bending-torsion correlation equation in three-phase expression form of the BSRC beams was put forward,which could serve as a valuable reference and basis for designing of BSRC beams.