低周反复扭矩下钢筋混凝土复合受扭构件的受扭性能研究

为了合理的设计反复扭矩下箱形截面钢筋混凝土双向压弯剪构件的受扭承载力的方法,通过对六个箱形截面钢筋混凝土试件进行了双向压弯剪作用下的受扭性能试验,得到了构件在反复扭矩作用下的裂缝发展规律及破坏特征,扭矩-扭转角曲线特性、耗能能力,并讨论了轴压比和相对偏心距对构件受扭性能的影响.基于变角空间桁架模型得出了构件的承载力相关方程,并结合规范推导出一个实用公式,其计算值与试验值符合较好,且偏于安全,具有一定的参考价值.

Study on Torsional Behavior of R.C. Members with Box Sections Subjected to Biaxially Eccentric Compression and Biaxial Shear Under Reversed Torsion

The purpose of this paper is to deduce a reasonable and dependable design method on the torsional behavior of box-section reinforced concrete members subjected to biaxially eccentric compression,biaxial shear under reversed torsion.The authors study the development regularity of cracks,the failure modes,the characteristics of the correlation curve between torsion and torsional angle,and the capacity for the dissipation of energy in terms of the torsional behavior experiment of six box-section reinforced concrete specimens subjected to biaxially eccentric compression,biaxial shear under reversed torsion.On the basis of the variable-angle space truss model theory,this paper arrives at the load-carrying capacity interaction equation of box-section members.This paper also proposes a more simple and practical calculation equation of the torque-carrying capacity,combined with specifications which agrees well with the experimental results and has reference value to some extent.