【摘要】 截面弯矩-曲率滞回规则是钢-混凝土组合梁最重要的力学特性之一,该滞回模型的建立为组合箱梁结构的弹塑性分析提供了可行性。利用幂函数插值方法,考虑剪力连接度对组合箱梁截面弯曲刚度的影响,提出了考虑界面滑移的钢-混凝土组合箱梁正向、负向截面弹性刚度及截面屈服弯矩计算方法,建立了组合箱梁截面弯矩-曲率三折线骨架曲线模型;在试验数据与理论分析的基础上,获得了组合箱梁正向及负向刚度退化规律表达式,并进一步提出了钢-混凝土组合箱梁截面弯矩-曲率最大点指向型滞回模型,将该模型的分析结果同试验结果进行了比较。结果表明:提出的组合箱梁截面弹性刚度、屈服弯矩、弯矩-曲率骨架曲线模型及滞回模型均与试验结果吻合良好,且模型计算方法简单明了,便于手算。更多还原

【Abstract】 Characteristics of bending moment-curvature hysteresis rule are one of the most important mechanical properties of the steel-concrete composite box-beams. The theoretical elasto-plastic characteristics of composite box beams was provided by establishing the moment-curvature restoring force model. The influence of shear connection degree on bending rigidity of steel-concrete composite box beams was considered by employing power function interpolation. The positive and negative elastic stiffness as well as the section yield moment considering the interface slip were proposed. A trilinear skeleton model of steel-concrete composite box beams was established,which was convenient for engineering application. Based on the test data and theoretical analysis,the positive and negative stiffness degradation rules were obtained. The maximum-oriented restoring force model was further proposed. The computation results using methods proposed in this paper were compared with the test results. The comparison shows that the computing methods of elastic stiffness,yield moment,skeleton curve and moment-curvature restoring force model are in good agreement with the test results. The computing method of the model is very simple,which is easy to calculate by hand.更多还原