连续刚构桥跨中下挠的影响因素分析

以高速公路连续刚构桥贺坪峡大桥和高速铁路连续刚构桥南庄特大桥为例，利用有限元计算分析软件Midas/Civil对两桥进行模拟计算分析，对混凝土收缩徐变及梁体箱梁上下缘应力差与两类刚构桥跨中下挠关系进行研究，得出收缩徐变及上下缘应力差对高速公路、高速铁路桥跨中长期下挠的影响规律。

Influence Factors Analysis of Midspan Sag of Continuous Rigid Frame Bridge

Taking the Hepingxia Bridge,an expressway continuous rigid frame bridge, and the Nanzhuang Super large Bridge, a high speed railway continuous rigid frame bridge, as examples, using finite element analysis software Midas / Civil for simulated calculation and analysis of the two bridge, the relationship is studied between midspan sag of two kinds of rigid frame bridge and the concrete shrinkage and creep as well as the differential stress of the upper and lower margin of box girder, drawing the influence rule of creep and shrinkage as well as the differential stress of the upper and lower margin on the midspan sag of highway, high speed rail bridge.