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对于工程中常用的钢-混凝土组合梁,根据组合截面平衡和变形协调条件,利用钢和混凝土材料的本构关系,建立了关于截面内力的微分方程,在微分方程中考虑了钢和混凝土之间的相对滑移、连接件刚度、混凝土收缩和徐变的影响。最后采用差分法求解了简支组合梁在均布荷载作用下的应力历程,并对连接件刚度、环境相对湿度等参数作了分析。
For steel-concrete composite beams commonly used in engineering, the differential equations of internal forces of cross-section are established according to the constitutive relations between steel and concrete materials according to the conditions of combined cross-section balance and deformation. In the differential equation, between steel and concrete The relative slip, the stiffness of joints, the effect of concrete shrinkage and creep. Finally, the difference method is used to solve the stress history of simply supported composite beams under uniform load, and the parameters such as the stiffness of joints and the relative humidity of environment are analyzed.