On the basis of relevant theory of hyperstatic structure in structural mechanism, the paper discusses the mechanism of secondary interior force caused by prestressing and its effect on structures.
基于结构力学中超静定结构的相关理论，讨论了预应力次内力产生的机理及其对结构的影响，进而提出合理利用次内力的设计思想。
By theoretical analysis, the considerations were put forward about the check with symmetry solving hyperstatic structure, avoiding internal force diagram check errors caused by inertial thinking.
通过理论分析，提出利用对称性求解超静定结构时应注意的问题，避免因惯性思维造成最后内力图校核出现错。
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