钢筋混凝土核心筒结构非线性有限元分析

Nonlinear finite element analysis of reinforced concrete core walls

钢筋混凝土核心筒作为高层建筑结构中的一种重要抗侧力构件,对其进行弯剪扭组合作用下力学性能研究非常具有必要性。基于已有的试验基础,对所选取试验模型进行合理的有限元建模与分析,所得到的分析结果与原有试验结果吻合良好。在此基础上对钢筋混凝土核心筒有限元模型进行偏心推覆加载分析,并考虑了高宽比、连梁配筋率、轴压比、偏心率对核心筒承载力的影响。结果表明:在偏心荷载作用下,随高宽比增加,核心筒承载力降低,破坏模式向弯扭破坏转变;连梁配筋率提高有利于提高筒体承载力;筒体承载力随轴压比的增加呈现先增加后减小的趋势,过大的轴压比将导致筒体的脆性破坏;随偏心率增加,筒体承载力下降,但偏心率的增加在一定程度上对于筒体的延性发挥有利。

It was very necessary to study the mechanical properties of reinforced concrete core walls under the comprehensive load which including bending,shear and torsion,because the reinforced concrete core walls work as an important anti-lateral force component in high-rise building structures. The finite element models were established and analyzed reasonably based on the test and the results fit the test well. Based on the abave results,the eccentric loading analysis was applied on the finite element models to analyze the copacity of concrete core walls,and the height-width ratio,reinforcement ratio of coupling beam,the axial compression ratio and eccentricity was considered in this simulation process.The results show that： under the eccentric load,the load-carrying capacity decreases with the increase of height-width ratio and the failure mode turns to bending torsion failure; the load-carrying capacity increases with the increase of the coupling beam reinforcement ratio; the load-carrying capacity increases at the beginning and then decreases with the increase of axial compression ratio and the excessive axial compression ratio will lead to a brittle failure mode; the increase of eccentricity ratio will result in the decrease of load-carrying capacity,but the increase of eccentricity ratio will contribute to the development of ductility for reinforced concrete core walls.