A secant pipe roofing (SPR) structure is a novel pipe roofing structure with considerable potential as a supporting structure for subway stations, whose structural system affects the bending loading conditions during construction. Therefore, it is essential to conduct further flexural research. However, minimal research has focused on the flexural behavior of SPR structures; in addition, the influence of parameters remains unclear and optimal parameter combinations remain lacking. Hence, the main purpose of this study was to investigate the flexural performance of the SPR structure and establish a finite element (FE) model with precise material constitutive models to optimize the parameters. First, the flexural behavior of the SPR structure was investigated using flexural tests. During the entire loading process, all specimens exhibited ductility, with the specimens' three stress phases and failure mechanisms discussed and clarified based on the experimental results. Subsequently, 16 sets of FE models were built to study the effects of the parameters on the ultimate capacity, deformation, and cost of the SPR structure. Furthermore, the calculations of the ultimate capacity and SPR flexural stiffness obtained using the proposed formulas were consistent with the experimental results and numerical simulations. Finally, a combination of different parameters was optimized using the fuzzy mathematical theory. The optimal parameter combination is a steel pipe diameter: steel pipe thickness: steel bar diameter: adjacent steel pipes’ overlapping length is 1:0.03:0.04:0.37. These results are expected to provide a reliable reference for the design and application of SPR structures.

正割管屋面 (SPR) 结构是一种新型管屋面结构，作为地铁车站的支撑结构具有相当大的潜力，其结构体系会影响施工期间的弯曲荷载条件。因此，有必要进行进一步的弯曲研究。然而，很少有研究关注 SPR 结构的弯曲行为；此外，参数的影响仍不清楚，最佳参数组合仍然缺乏。因此，本研究的主要目的是研究 SPR 结构的弯曲性能，并建立具有精确材料本构模型的有限元 (FE) 模型以优化参数。首先，使用弯曲试验研究了 SPR 结构的弯曲行为。在整个加载过程中，所有试件都表现出延展性，根据实验结果对试件的三个应力阶段和破坏机制进行了讨论和阐明。随后，建立了16套有限元模型，研究参数对SPR结构极限承载力、变形量和造价的影响。此外，使用所提出的公式计算的极限容量和 SPR 弯曲刚度与实验结果和数值模拟一致。最后，使用模糊数学理论优化了不同参数的组合。最佳参数组合为钢管直径：钢管厚度：钢筋直径：相邻钢管的搭接长度为1:0.03:0.04:0.37。这些结果有望为SPR结构的设计和应用提供可靠的参考。