Internal force figure would be fault if wer make simply use of these software to analysis the closed structure.
为了解决这个问题，通过内力分析，用等效结构方法计算原结构内力，内力图不会失真。
According to theoretic value, some measurements for stress and deformation are adopted to control internal force and figure in a reasonable range.
应力和变形控制中，以理论值为指导，采取各种监测手段，使结构的内力和线形控制在合理范围之内。
According to the calculus relation, the internal force chart can be gained by confirming the begin points, figure shape, ending points. This method is simple and easy to be grasped.
这种方法根据微积分关系，确定曲线的始点、形状和末点，即可直接得到不同外力作用下平面弯曲梁的内力图，简捷且易掌握。
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