配置单根钢筋的混凝土名义应力研究

Study on Nominal Stress of Concrete with Single Reinforcement

为研究钢筋对混凝土名义应力的影响,对18个中心配置单根钢筋的混凝土棱柱体进行了轴心受压试验,并进行了有限元模拟。结果表明:钢筋对保护层混凝土的劈裂作用是存在的,并且这种作用影响混凝土的名义应力;当钢筋直径与混凝土保护层厚度成比例变化,即径厚比不变时,混凝土的名义应力不受影响;当截面尺寸不变,混凝土名义应力随着钢筋直径的增大而减小;当钢筋尺寸不变时,混凝土名义随混凝土保护层厚度的增加而增大。建立的有限元模型很好地预测了试件的变形和承载能力,建模方法可为类似试件的有限元分析提供参考。

In order to study the effect of steel reinforcement on the nominal stress of concrete,the axial compression tests and finite element simulation were carried out on 18 concrete prisms with single steel reinforcement.The results show that the splitting effect of steel bar on protective layer concrete exists,and this effect affects the nominal stress of concrete.The nominal stress of concrete is not affected when the diameter of steel bar is proportional to the thickness of the protective layer of concrete,that is,the ratio of diameter to thickness is unchanged.When the cross-section size is constant,the nominal stress of concrete decreases with the increase of reinforcement diameter.When the size of reinforcement is unchanged,the nominal value of concrete increases with the increase of the thickness of concrete protective layer.The established finite element model can well predict the deformation and bearing capacity of the specimen,and the modeling method can provide a reference for the finite element analysis of similar specimens.