A new point is put forward that transverse bimoment has different influence on the two kinds of cross section thin-walled beams, and on their St-Venant principle conditions. 2.
时对外载等效中
现
横向双力矩这一广义力进行研究，指它在开口和闭口
壁梁约束扭转问题中和圣维南原理适用条件中分别占有不
位。
A new point is put forward that transverse bimoment has different influence on the two kinds of cross section thin-walled beams, and on their St-Venant principle conditions. 2.
时对外载等效中现横向双力矩这一广义力进行研究，指它在开口和闭口壁梁约束扭转问题中和圣维南原理适用条件中分别占有不位。
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