不锈钢筋-圆不锈钢管海砂混凝土构件受弯性能研究
李德山 , 王志滨 , 林继烃 , 李玉甫 , 陈文灿
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (01) : 119 -127.
不锈钢筋-圆不锈钢管海砂混凝土构件受弯性能研究
Bending Performance of Stainless Steel Bars-Sea Sand Concrete Filled Circular Stainless Steel Tubular Members
为研究不锈钢筋-圆不锈钢管海砂混凝土构件的受弯性能,文中建立了该类构件的有限元分析模型。基于有限元典型算例,分析了其纯弯全过程的受力机理。并对该类构件进行了参数分析,系统研究了混凝土强度、钢管屈服强度、纵筋屈服强度、钢管含钢率和纵筋配筋率对该类组合构件纯弯性能的影响规律。研究结果表明:内置纵筋显著提高了该构件的抗弯承载力;且组合构件的抗弯承载力随混凝土强度、钢管屈服强度、纵筋屈服强度、钢管含钢率和纵筋配筋率的增大而增大;该组合构件的抗弯刚度随混凝土强度、钢管含钢率和纵筋配筋率的增大而增大,随钢管和纵筋屈服强度的增大而减小。现有规范或文献中针对该类构件的抗弯性能计算方法,存在对其抗弯刚度高估、抗弯承载力低估的问题。为此,本文基于60个系统设计的有限元算例,通过回归拟合建立了适用于该类构件的抗弯承载力与组合抗弯刚度的简化计算公式,且简化计算结果与有限元模拟结果吻合较好。
In this paper, a finite element (FE) analysis model was developed to investigate the flexural behavior of stainless steel bars-sea sand concrete filled circular stainless steel tubular specimen. Based on the FE model, the stress mechanism under pure bending was investigated. The influences of concrete strength, steel tubular yield strength, yield strength of the longitudinal bars, steel ratio of the steel tube, and longitudinal bar ratio on the bending performance of the composite member were investigated. The results highlight the significant enhancement in flexural bearing capacity due to embedded longitudinal bars. Additionally, the flexural bearing capacity of the composite column increased with higher concrete strength, steel tubular yield strength, yield strength of the longitudinal bars, steel ratio of the steel tube, and longitudinal bar ratio. Moreover, the composite bending stiffness increased with higher concrete strength, steel ratio of the steel tube, and longitudinal bar ratio, while decreased with higher yield strength of the steel tube or longitudinal bars. The study also identified that current calculation methods overestimated the flexural stiffness but underestimated the flexural resistance of such members. Through 60 FE examples, simplified models for estimating the bending resistance and composite bending stiffness of such members were regressed. The simplified calculation results show good agreement with the FE predictions.
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广东省普通高校特色创新类项目(2022KTSCX246)
广东建设职业技术学院校级科研项目(KY2023-08)
泉州市科技计划项目(2021C015R)
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