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为研究以花纹钢板为上翼缘的钢-混凝土组合梁的承载力和破坏机理,对花纹钢板-混凝土界面受剪试件进行了推出试验,对组合梁试件进行了受弯性能试验,分析了试件的破坏特征、应变分布和荷载-位移曲线。试验结果表明:扁豆型花纹钢板与混凝土界面的黏结强度介于光圆钢筋和螺纹钢筋混凝土黏结强度之间,混凝土对钢板的包裹作用对界面黏结强度有重要影响;组合梁受弯性能试件的最大挠度达到L/45(L为组合梁跨度),呈现明显的延性破坏特征;钢梁-混凝土翼板处于良好的共同工作状态,达到完全抗剪组合承载力;组合梁抗弯刚度组合作用系数约为0.4,界面滑移对变形的影响不可忽略。根据试验结果,给出组合梁的钢-混凝土界面受剪承载力和界面抗剪刚度计算方法。
In order to study the bearing capacity and failure mechanism of the steel-concrete composite beam with the rib as the upper flange, the test of the plate-concrete-interfacial shear specimens was carried out. The bending behavior of the composite beam specimens was analyzed and analyzed The destructive characteristics, strain distribution and load-displacement curve of the specimen were obtained. The test results show that the bonding strength of lentil pattern steel plate to the concrete interface is between that of the light-round steel bar and the screwed reinforced concrete, and the effect of concrete on the steel plate bonding has an important influence on the interfacial bond strength. The maximum deflection reaches L / 45 (L is the span of the composite beam), showing obvious ductile failure characteristics; the steel beam-concrete wing is in a good working state and achieves the complete shear bearing capacity; the combined effect coefficient of composite beam flexural rigidity is about 0.4, the impact of interface slip on the deformation can not be ignored. According to the test results, the calculation method of the shear capacity and interface shear stiffness of the steel-concrete interface is given.