1·The effect factors on the parameter of torsional irregularity were analyzed. The conclusion provides theory basis to torsional resistance design of structures under earthquake.
对扭转不规则系数的主要影响因素进行了分析，为地震作用下结构的抗扭设计提供了理论依据。
2·The expression of coefficient of increase in cracking resistance in prestressed torsional members is derived on the basis of concrete characteristics under biaxial strength.
本文根据砼的双轴强度特性，导出了预应力受扭构件抗裂度提高系数的表达式。
3·The torsion resistance of the tension bar and the calculatiolls of bending shear stress, free torsional shearstress and bending torsional shear stress on the section are also discussed.
性质：用圆柱形材料试件作抗扭实验可求得扭矩和扭角的关系，相应最大扭矩的最大剪断应力叫抗扭强度。
4·Through integral cast forming, the spiral torsional shaft has the advantages of high strength and abrasion resistance, safety and reliability, long service life, low using cost and the like.
本实用新型通过铸造一体成型，具有强度及耐磨性好、安全可靠、使用寿命长、使用成本低等特点。