【摘要】 基于咬合型管幕试件的抗弯性能试验，研究了咬合型管幕试件的力学性能及破坏形态。为进一步研究关键结构参数对咬合型管幕试件抗弯性能的影响，运用ABAQUS建立了咬合型管幕试件的有限元模型，并通过室内试验验证了模型的正确性；进而分析了钢管咬合程度、钢管壁厚及钢筋直径对咬合型管幕试件抗弯性能的影响。结果表明：咬合型管幕试件抗弯性能良好，试件最终发生延性破坏；钢管咬合程度、钢管壁厚对试件的抗弯承载力影响显著，钢筋直径对试件的抗弯承载力影响不明显。最后，给出了钢管咬合程度、钢管壁厚及钢筋直径与抗弯承载力的关系式；并通过多元线性回归得到了咬合型管幕试件抗弯承载力简化计算公式。更多还原

【Abstract】 Based on a flexural testing of the secant pipe roofing specimen(SPRS), the mechanical property and failure mode of the SPRS specimen were investigated. In order to further study the effect of key structural parameters on flexural behavior of SPRS specimen, the finite element models(FEMs) of SPRS specimen were established using ABAQUS, and the accuracy of the models was verified according to the laboratory experiments. Subsequently, the influences of the overlapping distance between the adjacent tubes, the thickness of the tube and the diameter of the steel bar on the flexural behavior of SPRS were studied. The results indicate that the SPRS specimen has a good flexural behavior and eventually occurs ductile failure. The overlapping distance between the adjacent tubes and the thickness of the tube have a significantly effect on flexural bearing capacity of specimen, and the effect of the diameter of the steel bar on the flexural bearing capacity of specimen is not significant. Finally, the relationship between the overlapping distance between the adjacent tubes, the thickness of the tube and the diameter of the steel bar and flexural bearing capacity were presented. The simplified calculation formula of the flexural bearing capacity of the SPRS specimen was proposed based on multiple linear regression.更多还原