The calculation formula of torsion moment of multi-strands wire rope as loaded are deducted by internal force analysis of single-strand wire rope and multi-strands wire rope while working.
对普通单层股钢丝绳和多股钢丝绳工作时内部受力进行分析，推导出多股钢丝绳加载时扭转力矩的计算公式。
2
Based on current concrete design criterion, a torsion stiffness formula for composite beams from the cracking stage to the limit stage was proposed for design reference.
基于现行硅结构设计规范，提出了组合梁从开裂到极限阶段抗扭刚度的计算公式，可供组合梁受扭设计参考。
3
It can calculate the torsion rigidity of the variable section step-shaft simply using the general formula for calculating the same diameter shaft which can be found directly in material mechanics.