预制拼装钢管混凝土柱偏压性能有限元分析

Finite Element Analysis of Eccentric Compression Performance of Precast Assembled Concrete-Filled Steel Tube Columns

目的提出一种新型预制拼装钢管混凝土柱,研究不同参数对其力学性能的影响,为该类构件设计提供依据。方法通过ABAQUS有限元软件建立试件模型,选取合理的材料本构关系验证模型可行。建立预制拼装钢管混凝土柱有限元模型,分析长细比、含钢率、偏心距、预制连接件内套管长度、内套管壁厚对其偏压力学性能影响。结果预制连接件内套管长度增加、内套管壁厚增加对模型极限承载力的提高具有一定作用;长细比增大,模型极限承载力降低,初始刚度降低;含钢率增大,模型极限承载力增大,初始刚度增大;偏心距增大,模型极限承载力降低,初始刚度降低,截面上压应变与拉应变的比值降低。结论预制连接件内套管长度、内套管壁厚对模型极限承载力影响不大,长细比、含钢率、偏心距对模型受力性能影响较大。

A precast assembled concrete-filled steel tube column is proposed to study the influence of different parameters on its mechanical properties,and provide a basis for the design of the component.A test model with ABAQUS finite element software is established,and a reasonable material constitutive relationship is selected to verify that the model is feasible.A finite element model of precast assembled concrete-filled steel tube column is established to analyze the influence of slenderness ratio,steel ratio,eccentricity,length of inner sleeve of precast connectors,and wall thickness of inner sleeve on its mechanical property of eccentric compression.With the increase of the length of the inner sleeve and the wall thickness of the inner sleeve,the ultimate bearing capacity of the model has a certain increased effect.With the increase of the slenderness ratio,the ultimate bearing capacity of the model decreases,and the initial stiffness decreases.As the steel ratio increases,the ultimate bearing capacity of the model increases,and the initial stiffness increases.As the eccentricity increases,the ultimate bearing capacity of the model decreases,the initial stiffness decreases,and the ratio of compressive strain to tensile strain on the section decreases.The length of the inner sleeve of the precast connector and the wall thickness of the inner sleeve have little effect on the ultimate bearing capacity of the model.The slenderness ratio,steel ratio,and eccentricity have a greater influence on the mechanical property of the model.