Instructional Planning and Its Practice for Calculating the Torsional Strength of Warped Cross-Section of Reinforced Concrete Members Subject to Torsion

钢筋混凝土受扭构件扭曲截面承载力和配筋的计算是《地下铁道与轻轨》课程中涉及混凝土结构设计的教学难点之一。本文结合课程教学内容，基于“理论推演、标准应用、实践检验”三维融合的教学理念，依据混凝土构件截面剪力流和变角度空间桁架斜压杆拉力的静力平衡关系提出了易于本科学生理解和掌握的钢筋混凝土受扭构件截面承载力计算和钢筋配置的理论推演方法，提出了钢筋混凝土受扭构件中钢筋配置的教学组织和设计。通过在《地下铁道与轻轨》课程中的教学实践表明，所提出的教学设计不仅有助于提高课程的教学质量，而且还有利于提高学生开展钢筋混凝土受扭构件结构设计的能力和创新意识。To calculate both the torsional strength and reinforcement of reinforced concrete members subject to torsion is one of the difficulties in teaching the course entitled Subway and Light Rail Transit. Considering the instructional contents of this course, and in combination with the educational philosophy of three dimensional integration of theoretical deduction, standard application and practical verification, the method to calculate both the torsional strength of wrapped cross-section of reinforced concrete members subject to torsion and the reinforcing bars is deduced and presented so that the method can be easily comprehended and mastered by undergraduates based on the static equilibrium relationship between shear force flow in the cross-section of concrete members and the tension in oblique rods in spatial truss model with changeable angles. The instructional design on the determination of reinforcing bars in reinforced concrete members subject to torsion is also presented in this paper. The practice of using the instructional planning presented in this paper for teaching the undergraduates the course entitled Subway and Light Rail Transit shows that the instructional planning does not only help improve the teaching quality of the course, but also enhance the undergraduates’ ability and their innovative awareness of thinking when designing the reinforcement of reinforced concrete members subject to torsion as well.