圆形孔蜂窝型钢高强混凝土梁受弯性能研究

Study on the bending performance of circular hole castellated steel reinforced high strength concrete beam

为研究圆形孔蜂窝型钢高强混凝土梁的受弯性能,设计制作了4根试验梁,并对其进行受弯加载试验。研究表明:圆形孔蜂窝型钢高强混凝土梁的受力过程可划分为弹性工作阶段、弹塑性工作阶段及破坏阶段;试验梁在加载过程中没有过早开裂,并且试件在屈服后依然有着较高的安全储备;试验梁破坏时的挠度值均在14 mm以上,远大于规范规定限值,表现出了良好的变形性能;基于试验结果,利用ABAQUS软件对试件进行非线性有限元分析,结果显示,两者吻合较好,进一步拓展分析可知:型钢及混凝土强度对试件初始阶段的弹性刚度影响不大,随着型钢或混凝土强度的增加,试件承载能力会逐渐上升,而其延性系数则会逐渐下降。

To study the bending performance of circular hole castellated steel reinforced high strength concrete beam,we designed four specimens,and then carried out flexural loading test.The results mainly show that the loading process of specimens can be divided into elastic stage,elastic-plastic stage and failure stage.During the loading process,the beam does not crack prematurely.And after yielding,the beam still owes high safety reserve.All the deflection value of specimens are beyond 14 mm when damaged,far surpassing the specification limit,which means that the beam has good deformation performance.Based on the test results,software ABAQUS was used to analyze the performance of specimens with nonlinear finite element method.And the finite element calculation results agree well with the test results.Based on the foundation,we used software ABAQUS to expand the analysis.The results show that the steel and concrete strength both have little effect to the initial elastic stiffness.With the increase of steel and concrete strength,the bearing capacity of specimens will gradually increase and the ductility coefficient will gradually decrease.