用微分法推导拉压静不定变形谐调方程

Derivation of the Harmonization Equation of Deflection with Differentiation for the Solution of the Static Indetermination Problem Caused by Tension or Compression

材料力学中，解决桥架拉压静不定问题时，推导变形谐调方程是其关键，以往都是用图解法近似导出变形谐调方程，本文作者提出用微分法导出普遍适用的变形谐调方程：△ｌ１＋△ｌ２＝２△３ｃｏｓα。

In mechanics of materials the deriVation of the harmonization equation of deflection is the key iD the solution of problem of static imdetermination caused by tension or comprssion of truss flame.In conventional practice the equations are derived approximately by means of illustrations This paper now presents a new universally applicable harmonization equation of deflection derived by means of differentiation .