连续梁桥中跨底板预应力束对边跨变形的影响

The Impact of Midspan Bottom Prestressing Tendon in Continuous Girder Bridge on the Deformation of Side Span

中跨底板预应力束对桥梁的变形具有较大的影响,迄今为止,有关中跨底板预应力束研究的文献较多,但考虑它对边跨变形影响的文献却不多.以某预应力混凝土连续梁桥为例,对影响连续梁桥边跨变形的因素做了简述.结合Midas/civil程序建立了该桥的空间梁单元有限元计算模型,计算了中跨底板预应力束张拉前后主梁边跨的变形值,并对计算值和实测值进行了比较,得出的一些结论对同类桥梁的变形分析具有一定的参考价值.

Midspan bottom prestressing tendon has a great influence on deformation of the bridge,so far,the research literature of midspan bottom prestressing tendon was a lot,but the little about it’s impact on the deformation in side span. Taking an example of a prestressed concrete continuous girder bridge,we made a brief introduction of the factors affecting the deformation of continuous bridge side span. Combined with Midas/civil program,a model for calculating the space beam element is established,and we calculated the deformation of side span before and after tension prestressed steel,and comparesed the calculate and measure value,some of the conclusions has a certain reference value.