混凝土核心筒的有限元模拟及若干参数的影响分析

Finite Element Modeling and Parameter Analysis of the Concrete Core Wall

运用ABAQUS分析软件,建立水平荷载作用下的钢筋混凝土核心筒有限元模型,进行非线性分析,并将分析结果与大比例试件的试验结果对比,对所采用的有限元模型加以验证。在此基础上,进行改变钢筋混凝土核心筒轴压比、高宽比和筒壁厚度的受力过程模拟分析,研究这些参数对筒体性能的影响。结果表明:随着轴压比的增大,筒体的破坏由受拉向受压破坏转变,筒体最大水平承载力经历先增加后减小的变化,延性变差;随着高宽比的增大,筒体破坏形态由剪切向弯曲破坏转变,延性增加,整体弯曲作用更加明显,最大底部剪力减小;随着壁厚的增大,试件破坏由截面压屈失稳向墙肢底部受弯破坏转变,墙肢破坏区域沿高度方向发展,耗能能力更强,承载力明显增大,变形能力显著增加。

Finite element（FE） analysis of the reinforced concrete core wall under lateral loading is performed in this paper.The FE model,using the software ABAQUS,is proposed to carry out the nonlinear analysis and is verified by comparing the computational results with the corresponding experimental ones obtained from laboratory tests of large-scale specimens.On this basis,a series of reinforced concrete core walls with different axial load ratios,aspect ratios and wall thicknesses are simulated and analyzed under lateral loading.The results show the effects of these parameters on the behavior of reinforced concrete core walls.With increase of the axial load ratio,the failure mode of core walls changes from tension failure mode towards compression one,and the lateral loading capacity of core walls,increases at first,and then decreases,with their ductility getting worse.With increase of the aspect ratio,the failure mode of core walls changes from the shear failure to the flexural failure with the improvement of ductility,while the base shear force decreases.Failure of the specimen with thin wall arises from the cross-section buckling instability, while the failure of specimens with thick wall is controlled by flexural capacity at bottom of wall piers,and with increase of the wall thickness,both bearing capacity and deformation ability of the core walls significantly increase and energy dissipation ability improve with the failure region extending upward from the bottom.