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托架下弦处于预压力、强大的轴拉力、弯矩、剪力和扭矩的共同作用下工作;而托架上弦则处于轴压力、弯矩、剪力和扭矩的共同作用下工作。本文经过5榀下承式托架和2榀上承式托架以及10个压弯扭模型梁的试验分析说明:用我国钢筋混凝土结构设计规范TJ 10-14中弯扭构件的抗扭强度计算公式和迭加原理计算这些构件是不合适的,而且编于过分安仝。在分析这些试验资料的基础上,提出了一个考虑拉、弯、剪、扭和压、弯、扭共同作用的实用强度计算方法,计算结果与试验结果符合较好。
The lower chord of the bracket works under the combined action of pre-stress, strong axial tension, bending moment, shear force and torque; while the bracket upper chord works under the joint action of axial pressure, bending moment, shear force and torque. This paper analyzes the torsional strength of the torsion and torsion members in the TJ 10-14 design specification for reinforced concrete structures in China, through the experimental analysis of the 5 榀 bottom bracket, 2 榀 top brackets, and 10 bending and torsion model beams. Formulas and superposition principles are not suitable for calculating these components, and they are compiled in over-conformity. On the basis of analysis of these experimental data, a practical strength calculation method considering the joint action of tension, bending, shearing, twisting, compression, bending and twisting is proposed. The calculated results are in good agreement with the experimental results.