钢管桁架作为一种新的建筑结构形式不但能够满足结构大跨度的要求，而且满足建筑任意曲线形式。
Steel pipe girder is a sort of new construction structure which not only can meet the requirements of wide span structure, but also can be applied to any kind of curved construction.
基于几何非线性有限元理论，推导了折线形索单元的刚度矩阵，建立了索张拉预应力钢桁架的几何非线性数值分析模型。
Based upon the theories of geometrical nonlinearity, the stiffness matrix of cable elements are put forward and the numerical model of cable-prestressed steel structures are established.
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