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进行了4个多室式钢管混凝土T形试件和2个多室式空钢管T形对比试件的纯弯试验,着重研究前者在纯弯状态下的变形过程及破坏形态,同时考察了截面尺寸、加载位置等参数对其纯弯力学性能的影响。试验结果表明:增大截面腹板高度能显著提高多室式钢管混凝土T形试件的抗弯承载力;力分别作用在翼缘或腹板时其承载能力有一定的差异;试件的破坏形态以整体弯曲为主。采用有限元方法对多室式钢管混凝土T形试件的弯矩-挠度曲线进行了全过程分析,与试验结果吻合较好。最后在参数分析的基础上提出了多室式钢管混凝土T形构件抗弯承载力的实用计算方法。
The pure bending tests on four T-shaped test specimens of CFST and two multi-chamber empty steel tubes were carried out. The deformation process and the failure mode of the T-shaped test specimens were investigated. In the mean time, Size, loading position and other parameters of its pure bending mechanical properties. The test results show that increasing the cross-section web height can significantly improve the flexural capacity of the T-shaped multi-cell concrete filled CFST. The load carrying capacity of the T-shaped CFST specimens is different when the force acts on the flange or the web respectively. The overall shape of the main bend. The whole process of the bending moment-deflection curves of multi-cell CFST T-shaped specimens was analyzed by finite element method, which is in good agreement with the experimental results. Finally, on the basis of parameter analysis, a practical calculation method of flexural capacity of multi-cell T-shaped CFST members is proposed.