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本文明确提出了形成体系力素矩阵的“对号入座”法则。用它,任何复杂体系的力素矩阵均可正确而简便地导出。以它为基础,本文又提出了桁梁空间分析的桁段有限元法。此法基本假设从计算工作量较少,计算精度较高,能用于平行弦及非平行弦桁梁分析,能极简便地考虑斜桥门架、横朕等局部构件的作用。文末分析了金沙江192米简支钢桁梁桥模型的试验资料,计算结果与实测良好接近。
This article explicitly puts forward the “opposite sign” rule that forms the system’s prime matrix. With it, the matrix of elements of any complex system can be derived correctly and easily. Based on it, this paper also presents the truss section finite element method of truss girder spatial analysis. The basic assumption of this method is that it can be used for the analysis of parallel chord and non-parallel chord truss girders with less calculation workload and higher accuracy. At the end of the paper, the experimental data of the model of the Jinshajiang 192 m simply supported steel truss girder bridge are analyzed. The calculated results are in good agreement with the measured ones.