基于统一强度理论的矩形钢管混凝土短柱轴压承载力计算

Calculation of Axial Bearing Capacity of Rectangular Concrete-filled Steel Tube Short Column Based on Twin Shear Unified Strength Theory

考虑矩形钢管长边、短边对核心混凝土的不同约束作用,将其对核心混凝土所产生的侧向压力等效为圆形钢管对核心混凝土产生的均匀侧向压力,并采用双剪统一强度理论对钢管内核心混凝土的受力进行分析;提出了矩形钢管混凝土短柱简单、实用的轴压承载力计算公式,并对影响因素进行了分析;将该公式计算值与相应文献试验值、其他公式计算值进行了比较,吻合较好。结果表明:所推公式具有很好的适用性,为矩形钢管混凝土柱的研究提供了一定的理论依据。

Considering the difference between restriction effect on core-concrete provided by broad faces and that provided by narrow faces of the rectangular steel tube appropriately, the lateral pressure of rectangular steel tube towards core-concrete was equivalent to the uniform lateral pressure towards it. Based on the twin shear unified strength theory, the force of core-concrete in the rectangular steel tube was analyzed. The simple and practical calculation formula of the axial bearing capacity of rectangular concrete-filled steel tube short column was proposed, meanwhile, the influencing factors on the bearing capacity were analyzed. The calculation results in the paper were compared with the experiment results and the calculation results in relevant documents, coinciding well with each other. The result shows that the formula deduced in the paper has good applicability and the solution has an important practical value.