钢筋混凝土双向受弯梁次生扭矩的分析研究

探讨了次生扭矩对钢筋混凝土双向受弯梁抗剪承载力的影响。提出逐级加载、待定系数的方法计算钢筋混凝土双向受弯梁的次生扭矩,编制了钢筋混凝土双向受弯梁次生扭矩的全过程分析计算机程序。计算值与试验结果的对比分析表明,该方法合理可行。通过对次生扭矩影响抗剪承载力的主要因素的分析,获得一些有参考价值的结论,并提出在工程实践中,计算承受集中荷载的有腹筋双向受弯梁的抗剪强度时,次生扭矩影响应予以考虑。

ANALYSIS OF SECONDARY TORSION OF BIAXIAL FLEXURAL REINFORCED CONCRETE BEAMS

The effects of secondary torsion on shear strength of biaxial flexural reinforced concrete beams are analyzed. A gradual loading scheme with pending-coefficients is introduced to calculate the secondary torsion of biaxial flexural reinforced concrete beams. Comparison and analysis of calculation results and test results show that the present method is feasible. Some valuable conclusions are reached. It is shown that secondary torsion should be considered while calculating the shear strength of reinforced concrete beams with web reinforcement under biaxial concentrated loads.