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某结构在其总的位置(梁系的轴线,壳体的中性面)已定,同时具有边界条件时,用§代表位置上任意一点,用d§代表构件上相应的线或面.取q~i、q~i和Q_i(i=1………n)来表达描述结构情况的应变、应变比和应力,Q_i和q_i是用这样方式选择的,sum from i(Q_i)q_i是应力Q_i与应变比q_i相乘的能量D,其累加之和已扩伸到i=1………n的范围.假定现在是标准的完全的塑性结构,其该假定的意义是:
A structure is defined in its general position (the axis of the beam system, the neutral plane of the shell). When there are boundary conditions, use § to represent any point in the position, and use d§ to represent the corresponding line or surface of the component. q~i, q~i, and Q_i (i=1.........n) express the strain, strain ratio, and stress that describe the structure. Q_i and q_i are selected in such a way that sum from i(Q_i)q_i is the stress. Q_i is the energy D multiplied by the strain ratio q_i, and the cumulative sum has been extended to the range of i=1.........n. Assume now that it is a standard complete plastic structure, its assumed meaning is: