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钢管混凝土结构的理论研究由于钢材和混凝土的本构关系、屈服准则等尚未统一,试验分析因为边界条件、尺寸效应、加载方法误差等的存在,加之节点区应力复杂,一般处于压、剪、弯复合应力状态,很难按照经典的数学和力学模型进行统一度量并加以分析研究,无法真实反映现实钢管混凝土结构梁柱加强环中节点在动力荷载作用下的状态。基于此,采用模糊数学中的模糊有限元的基本原理和方法,利用有限元软件ANSYS建立了钢管混凝土梁柱加强环中节点有限元模型,在模糊数学中截集定理的基础上,通过改变截集λ值来实现钢管混凝土柱端不同的约束,实现了比较符合实际情况的柱端约束,并对其在动力荷载的工作性能进行了综合分析和判断,算例分析结果表明所建立的模糊有限元计算模型可以用于节点区的受力性能分析,可以为钢管混凝土梁柱节点的设计和施工提供一定的参考价值和指导意义。
Due to the constitutive relation between steel and concrete and the yield criterion, the experimental research has not been uniform yet. Because of the existence of boundary conditions, size effect and loading method errors, coupled with the complicated stress in the node area, The complex stress state is hard to be unifiedly measured and analyzed according to the classical mathematics and mechanics model. It can not truly reflect the state of nodes under the dynamic load in the reinforced concrete-filled steel tubular beam. Based on this, the finite element method of fuzzy finite element method in fuzzy mathematics is used to establish the finite element model of the node in the reinforced concrete filled steel tubular beam and column with finite element software ANSYS. Based on the cut-off theorem in fuzzy mathematics, Set the λ value to achieve different constraints on the concrete-filled steel tubular column ends and achieve a more realistic column-end constraint, and carried out a comprehensive analysis and judgment on the working performance of the dynamic load. The results of the example analysis show that the established fuzzy limit The metacomputing model can be used to analyze the mechanical properties of the joints, which can provide some reference and guidance significance for the design and construction of the concrete-filled steel tubular beam-column joints.