These formulae give us the stress and strain in a prismaticbeam when it is subjected to pure bending .
当棱柱形梁受纯弯曲时,这些公式给出了它的主力和主变。
2
Based on the theory of the bending of non-prismaticbeam, the paper has derived a rigidity matrix and the equivalent node load of the rigid-frame element with variable sections.