Calculation of torsion center position of box girder;

Utilizing the second theory of KAUmansky the explicit formula for torsion center position calculation of box beam is derived.

According to the structural characteristics of thin-walled box girder structure and theory of constrained torsion,which is on calculating the constrained torsion of thin walled box beams,the formula for calculating the positions of their torsion centers is presented in this paper.

The Study on Cardiac Twist;

Through the twist simulation and theoretical analysis of main technological parameters of twist millimeter wave rectangular wave-guide, the hollow twist process of millimeter wave rectangular wave-guide is confirmed.