再次，讨论了预应力、混凝土徐变、箱梁抗弯刚度等对桥梁结构下挠的影响。
Thirdly, pretressing, concrete creep and bending rigidity of box girder are studied to discuss their impacts on the deformation of girder.
针对预弯组合梁的施工特点，建立了一套综合考虑混凝土的收缩、徐变及钢材松弛影响的时效分析方法。
Based on the construction peculiarity of preflexed beam bridges, an analytical method is proposed for predicting properties of bridges structures.
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