如果预应力筋达到EN 10138中的最大荷载下的延伸率规定值，则可以假定其在延伸时有足够的塑性。
Adequate ductility in elongation may be assumed if the prestressing tendons obtain the specified value of the elongation at maximum load given in en 10138.
按照实际施工过程，考虑最不利计算荷载，根据平截面假定，分别对钢梁单独受力和钢-混凝土组合梁两种工况进行计算。
Following the process of construction, considering the worst loads, according to the assumption of plane section, the steel girder alone and the composite girder are computed respectively.
无粘结筋的变形不符合平截面变形假定，因此由外荷载引起的应力计算比较复杂。
The computation of stress resulted by external load is relatively complex because the deformation of unbonded prestressed strand cannot comply with the plane section assumption.
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