竖向混合结构转换柱构件抗剪承载力研究

STUDY ON SHEAR CAPACITY OF TRANSITION COLUMN IN VERTICALLY HYBRID STRUCTUER

竖向混合结构转换柱型钢在柱中截断,导致转换柱内力传递畸变。该文利用ABAQUS有限元软件,建立了考虑混凝土不同约束效应的转换柱精细有限元模型,通过模拟结果与试验结果对比,验证了该方法的正确性。根据转换柱的受力和变形特性,研究了转换柱的反弯点位置变化情况。随后根据转换柱不同破坏模式下构件受力特点,研究了转换柱的受剪承载力公式,并与参考文献中的试验结果进行了对比分析。最后对现有规范中转换柱抗剪能力公式的安全性和合理性进行了研究,并采用精细有限元模型对修正公式进行了验证,结果表明:现有规范计算的抗剪承载力偏于不安全,需要根据转换柱的受力及变形特性进行合理的修正。

In a vertically hybrid structure,the steel is truncated in the transition column,which will lead to the distortion of the internal force transform.The finite element model of SRC-RC transition columns was developed using ABAQUS by considering different effects of restraint stress around concrete.The model has been validated against published experimental results.According to the internal force and deformation characteristics of a transformation column,the inflection point location was researched.Then,the shear capacity of the transition column was studied,and the results were compared with experimental results in references.Finally,parametric studies were performed to investigate the security and rationality of the shear capacity formula in code by FEM.The results showed that the shear capacity of existing specification is unsafe,and the formula needs to be revised by considering the internal force and deformation characteristics of a transformation column.