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通过定义等效方形截面和改变混凝土强约束区、弱约束区界线底角来衡量多室式T形截面内钢材对混凝土的整体约束作用,依据轴压试验结果修正了Mander约束混凝土模型中有效侧向约束力及下降段的表达式,建立了核心混凝土的本构关系。应用ABAQUS对8个多室式钢管混凝土T形短柱试件的轴压性能进行了模拟,模拟结果与试验数据的对比表明,该本构关系能较好地适用于对构件性能的非线性分析。在此基础上探讨了构件中钢材和混凝土的共同工作情况,发现其工作机理与其它截面形式的钢管混凝土柱较为一致。将多室式钢管混凝土T形柱视为由3个矩形钢管混凝土部件折减钢板后组成,应用叠加原理得出了构件的强度承载力公式,可供实际应用参考。
By defining the equivalent square cross section and changing the bottom corner of the confined zone and the weak bounding zone of the concrete, the overall restraint effect of the steel in the multi-chamber T-section on the concrete is measured. According to the results of the axial compression test, the effective side in the Mander-confined concrete model The constitutive relations of core concrete are established for the expressions of binding and descending segments. ABAQUS was used to simulate the axial compression properties of eight multi-cell tubular T-shaped short columns. The comparison between the simulation results and the experimental data shows that the constitutive relation can be well applied to the nonlinear analysis of component performance . On this basis, the common work of steel and concrete in components is discussed, and the working mechanism is found to be consistent with that of other CFST columns. The T-shaped multi-cell tubular T-shaped columns are treated as three rectangular steel tube concrete components after the reduction of steel composition, the application of the principle of superposition obtained strength bearing capacity formula for reference for practical applications.