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采用定量计算和定性分析的方法,以构成挠度因素分析理论为依据,建立有限元模型,在讨论分析了影响长期下挠的主要因素后,选取了混凝土箱梁超重、桥面铺装超重、预应力损失、混凝土收缩徐变、刚度降低等6个影响长期下挠的因素,分析各影响因素对长期下挠的灵敏性,从而得出影响长期下挠最主要的因素是预应力损失和混凝土的收缩徐变。
Based on the theory of deflection analysis, a finite element model is established by means of quantitative calculation and qualitative analysis. After discussing and analyzing the main factors that affect the long-term deflection, the concrete box girder overweight, Stress loss, concrete shrinkage and creep, stiffness reduction and other six factors affecting the long-term deflection, the analysis of the impact of various factors on the long-term deflection of the sensitivity, which concluded that long-term deflection is the most important factor in the loss of prestressed concrete and Shrinkage and creep.