预应力混凝土桥梁起拱度控制方法的研究

Control Methods Research in Deflection Upwards of P.C. Beams

结合襄樊 -十堰高速公路谷城至武当山段在建的界牌垭高架桥 ,分析混凝土徐变对预应力混凝土桥梁起拱度的影响 ,并提出控制桥梁过度起拱的设计方法和施工措施 .经实践检验 ,预设向下的二次抛物线反拱和严格控制存梁期的方法切实可行 ,能有效减少和控制过度起拱的发展 .

Influence on reversed arch of creep in prestressed concrete beam is analyzed by combining with project under construction Jiepaiya bridge in the reach from Gucheng to Wudangshan of Xiangfan-Shiyan highway. Design methods and construction measures are provided to control over deformation presetting the downwards parabola reversed arch and controling the beam preserving time strictly are feasible, which can decrease and control the development of over deformation.