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目的提出计算T形钢管混凝土芯柱的正截面承载力的有效方法,为钢管混凝土在工程中的设计和应用提供参考依据.方法基于平截面假定和材料模型,利用数值积分法编制了适用于计算T形钢管混凝土芯柱正截面承载力的非线性分析程序,得出极限承载力的电算结果以及不同钢管厚度和不同混凝土强度等级的N-M相关曲线.结果在偏压作用下,混凝土强度等级变化以及含钢率对T形钢管混凝土芯柱极限承载力影响明显.极限承载力随混凝土强度等级提高而提高,但是随着偏心距增大混凝土强度等级对极限承载力提高幅值越小;钢管壁越厚,含钢率大,提供核心混凝土的约束力越强,相同M值能承受的力越大,抗震性能与延性越好.结论实际工程应用时,通过试件的数值计算分析得出的M-N曲线可以快速计算出钢管厚度,为T形钢管混凝土芯柱的方案设计提供便利.
Objective To provide an effective method for calculating the normal section bearing capacity of T-shaped CFST core columns, and to provide a reference for the design and application of CFST in engineering.Methods Based on the assumption of flat section and material model, T-shaped non-linear analysis program of the bearing capacity of concrete filled steel tubular column with normal cross-section, the calculated results of ultimate bearing capacity and the NM correlation curves of different steel pipe thickness and different concrete strength grades were obtained.Results Under the bias, the strength of concrete changed As well as the steel content significantly affected the ultimate bearing capacity of T-shaped CFST column.The ultimate bearing capacity increased with the increase of concrete strength grades, but with the increase of eccentricity, The thicker the steel, the higher the steel content, the stronger the binding force to provide the core concrete, and the greater the bearing capacity of the same M value, the better the anti-seismic performance and ductility.Conclusion When the practical engineering application, through numerical analysis of the specimen The MN curve can quickly calculate the thickness of the steel pipe, which is convenient for the design of the T-shaped concrete-filled steel tubular column.