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为了研究一种新型钢-混凝土组合暗梁的受力性能,并考察型钢截面尺寸对组合暗梁抗弯刚度和受弯承载力的影响,对2根简支钢-混凝土组合暗梁进行试验研究。试验结果表明:钢-混凝土组合暗梁整体工作性能良好,型钢与混凝土之间的相对滑移很小,可忽略不计。极限破坏状态时,组合暗梁跨中截面的挠度很大,说明组合暗梁具有良好的延性。此外,型钢的截面尺寸对钢-混凝土组合暗梁的抗弯刚度和受弯承载力有显著的影响。在试验研究的基础上,提出了钢-混凝土组合暗梁抗弯刚度和塑性受弯承载力的计算方法,理论值与试验值吻合很好。
In order to study the mechanical behavior of a new type of steel-concrete composite dark-beam, and examine the effect of section size on the flexural rigidity and flexural capacity of the composite dark-wall beam, two simple-supported steel-concrete composite dark beams were tested. The test results show that the overall workability of the steel-concrete composite dark beam is good, and the relative slip between the steel and the concrete is small and negligible. Under the condition of ultimate failure, the deflection of the cross-section of combined dark beam is very large, which shows that the composite dark-beam has good ductility. In addition, the section size of the section steel has a significant effect on the flexural rigidity and flexural capacity of the steel-concrete composite concealed beams. Based on the experimental study, the calculation method of flexural rigidity and plastic bending capacity of composite steel-concrete composite beam is proposed. The theoretical value is in good agreement with the experimental data.