钢管煤矸石混凝土受弯构件的承载力分析

目的 分析钢管煤矸石混凝土受弯构件的受力过程，确定其承载力，及含钢率对承载力的影响．方法 对具有5种不同含钢率的钢管煤矸石混凝土受弯构件进行试验测试，绘制弯矩-挠度曲线、弯矩-最大拉应变曲线，分析曲线的特征、确定承载力极限状态．结果 确定了曲线上的3个特征点，将构件的变形过程分为弹性、弹塑性和强化阶段，定义截面的塑性已得到充分发展而受拉区钢管最外边缘纤维即将进入强化的点为试件的抗弯极限状态点．推导出了钢管煤矸石混凝土受弯构件的承载力计算公式，计算结果与试验结果吻合良好．结论 推动了将钢与煤矸石混凝土组合结构应用于工程实践的进程，为研究钢管煤矸石混凝土偏心受压构件的力学性能奠定了良好的基础．

Bearing Capacity of Gangue Concrete Filled Steel Tubular Member under Moment

In order to analyze the deforming process and bearing capacity of the gangue concrete filled steel tubular members under moment,the gangue concrete filled steel tubular members with five steel ratios under moment are tested.The curve of moment and deflection and curve of moment and the maximum tension strain are drawn and analyzed.The influence of steel ratio is also considered.Three key points which divide the curve into three parts are determined.In different parts,material of middle section which bears the maximum moment shows elastic,elastoplastic and plastic separately.The point which is the first point of the plastic part is defined as the point in which the member arrives.The bearing capacity of the gangue concrete filled steel tubular members under moment is defined and its formula for calculation which is related to steel ratio is put forward.This formula is proved to be accurate by experimental data.All these lay the theoretical groundwork for the research to the gangue concrete filled steel tube columns under eccentric load.They also play a decisive role in putting the composite structure of steel and gangue concrete into the engineering practice.If the gangue,which is industrial waste,can be used,the natural sources will be saved.