The effect of different sizes of sections , modes and values of residual stresses are studied . through the analysis , the conclusion is arrived at that the universal slenderness ratio should be used to better correlate the stability of box section beams with the member length instead of the out - of - plane slenderness , and the stability coefficient is taken to be 1 . 0 for practical used box girder . then , the elastic critical loads of box section beam - columns are obtained based on the gjelsvik theory , and the relationship between axis force p and moment m is given 最后，运用ansys通用有限元程序的beam189单元，引入初弯曲和残余应力的影响，用考虑几何和材料双重非线性的有限元求解格式求得箱形柱在不同轴力和弯矩比例作用下的弹塑性极限承载力，通过对十几个不同截面尺寸构件在不同长细比下的承载力计算，发现在轴力p远大于弯矩m时，构件将是平面外失稳控制，而当轴力p远小于弯矩m时，构件则以平面内失稳为主。
Chapter 3 erected the relationship between refraction error and cornel ablation depth in theory . the paper proposed various mathematical models which can be used for proceed the simple myopia , simple hypermetropia , compund myopia astigmatism , compund hypermetropia astigmatism , simple myopia astigmatism , simple hypermetropia astigmatism , mixed astigmatism . the influence of the astigmatic axis and the degree of astigmatism on the correction field is discussed . wavefront aberration guided excimer laser cornea ablation is a main method of customised corneal ablation 以数学的方法研究出了屈光性单纯近视、屈光性单纯远视、复性近视散光、复性远视散光、单纯近视散光、单纯远视散光、混合性散光屈光矫正的物理模型；并揭示了不同轴位的转换规律，对不同散光情况下的初始角膜两个不同方向的曲率半径和手术后最终的曲率半径作了定量的研究。
Then , this paper edits other computer program to calculate thirty sgrc frame columns , and researches the drift capacity of sgrc frame column , and analysis the turning capacity of frame column " s plastic hinge . then the relational expression of the curvature ductility factor and ratio of hoops of sgrc frame columns is derived . this paper analysis the relation of the curvature ductility factor and the relative drift of sgrc frame columns , and discuss the question of the minimum values of ratios of hoops of sgrc frame column at different axial load ratios 一11一太原理工大学硕_ i :学位论文使用本文程序另外模拟计算了30榻煤研石混凝土框架，进一步分析了轴压比和配箍率对煤研石混凝土框架柱曲率延性的影响，编写程序计算了30根煤研石混凝土框架柱，对煤研石混凝土框架柱的侧向变形能力进行了研究，分析了柱塑性铰的转动能力，导出了煤研石混凝土框架柱的曲率延性系数与配箍率的关系式，分析了煤研石混凝土框架柱的曲率延性系数与框架柱相对侧向位移的关系，讨论了煤研石混凝土框架柱在不同轴压比下最小配箍率的取值问题。
