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文章以大宁河大桥为工程依托,开展了4根不同连接件的钢-混凝土组合梁负弯矩区承载力与刚度试验研究,测得了组合梁负弯矩区的弯曲极限承载能力,弯矩-曲率曲线,荷载-位移变化曲线。分析试验结果得出:采用焊钉和开孔板两种不同的连接件,从加载至破坏三个阶段的受力模式。从承载力和刚度两方面分析,采用开孔板连接件试验梁均大于配置焊钉连接件试验梁。试验结果对探讨钢-混凝土组合梁负弯矩区的细部构造设计,具有一定的参考价值。
Based on the project of Daninghe River Bridge, the paper carried out the test and research on the bearing capacity and stiffness of the negative bending moment zone of four steel-concrete composite beams with different connections. The bending ultimate load capacity and moment - curvature curve, load - displacement curve. Analysis results show that: using welding nails and perforated plate two different connectors, from loading to destruction of the three stages of the force mode. From the analysis of bearing capacity and stiffness, the test beam using the perforated plate connector is larger than the test beam with the solder nail connector. The test results have certain reference value for the detailed structural design of the negative bending moment zone of steel-concrete composite beams.