混凝土短梁斜向开裂后的有效剪切刚度与变形-西安建筑科技大学学报.pdfVIP

第 48 卷 第 1 期 西安建筑科技大学学报（自然科学版） Vol. 48 No.1 2016 年 2 月 J.Xian Univ. of Arch. Tech. (Natural Science Edition) Feb. 2016  DOI ：10.15986/j.1006-7930.2016.01.010 混凝土短梁斜向开裂后的有效剪切刚度与变形  张兴虎，李 婷，姜维山 (西安建筑科技大学土木工程学院，陕西 西安 710055) 摘要：为了研究钢筋混凝土短梁有效剪切刚度的计算，根据以往试验资料分析了短梁开裂后的斜裂缝形态及其发展，探讨了 此阶段的剪切刚度变化规律；在变角桁架模型的基础上运用内插法得出混凝土从斜向开裂至 0.8Fu 阶段的有效剪切刚度，进 而计算出相应的剪切变形和挠度，并与试验结果进行比较；此外，将计算值与其它三种方法的计算值进行了对比分析．结果 表明，按本方法计算出的挠度值与试验值符合较好；相对于其它方法，本方法能较好地预测短梁自斜向开裂至 0.8Fu 阶段的 变形，且提高了计算精度．  关键词：短梁；有效剪切刚度；斜裂缝；变角桁架模型；内插法 中图分类号：TU375.1   文献标志码：A 文章编号：1006-7930(2016)01-0058-05  Effective shear stiffness and deformation of concrete short beams after diagonal cracking ZHANG Xinghu, LI Ting , JIANG Weishan (School of Civil Engineering, Xian Univ. of Arch. Tech., Xian 710055, China) Abstract: To study the calculation of effective shear stiffness of reinforced concrete short beam, the shapes and developments of the diagonal crack after the short beam cracking were analyzed according to the previous test data, and the variation of shear stiffness in this stage was discussed. Based on the variable angle truss model, the effective shear stiffness of short beam from diagonal cracking to 0.8Fu was obtained by using the interpolation. Then the corressponding shear deformation and deflection were calculated, and compared with experimental results. In addition, a contrastive analysis of the calculated values of this method and other three meth- ods were carried out. The results show that the deflection values calculated by this method are in good agreement w