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本文从功互等定理出发,阐述了用有限元方法计算空间复杂结构中杆件内力影响线(面)的基本原理,导出了适合于各种联接情况的空间杆单元,当端部发生强迫杆端变形时相应的单元节点力的计算公式,实现了用SAP5程序计算空间复杂结构中杆件的内力影响线(面)。
Based on the theorem of reciprocity, the paper expounds the basic principle of using finite element method to calculate the influence line (surface) of the internal force of the bar in space complex structure and derives the space bar unit suitable for all kinds of connection conditions. When the forced bar The calculation formula of the corresponding unit nodal force at the end deformation is used to calculate the internal force influence line (surface) of the bar in the space complex structure by using the SAP5 program.