shortening effect meaning in English

缩短作用

Firstly the method of rayleigh - ritz and galerkin were adopted to analyze the beams under loading combined antisymmetric end moments with transverse uniformly distributed load theoretically , and the results were compared with that offered by kirby , p . a and nethercot , d . a , it showed that result was approximate and even lower and so to some extent the approach used in the paper is practice . secondly several principal factors that affect the beam stability were analyzed respectively , especially the shortening effect was mentioned scarely in some literature so far . at last , the author adopted the matlab to program the finite element software to analyze numerically , the results derived from it were agreed well with it
本文分别采用了rayleigh - ritz法和galerkin法从理论上分析了反对称端弯矩及横向均布载共同作用下梁的等效弯矩系数，并与kirby , p . a和nethercot , d . a分析结果进行对比，结果表明本文采用的方法得出的等效弯矩系数与其得出结果比较，在均布荷载与端弯矩比例相差不大时基本接近或偏小，说明此方法是可行的，而当均布荷载与端弯矩比例较大时，应根据均布荷载作用进行弯矩等效方法来计算。