混凝土徐变对连续刚构桥长期下挠的影响研究

摘要

混凝土徐变是影响大跨连续刚构箱梁桥跨中长期下挠的主要因素，挠度的不断增大影响了桥梁的行车舒适性和使用寿命。混凝土徐变对大跨连续刚构桥长期挠度的影响很大，以某七跨连续刚构桥为工程背景，建立有限元模型，分析采用不同规范、不同加栽龄期以及二期铺装等影响因素对大跨连续刚构桥长期下挠的影响。%Concrete creep is one of the main factors of influencing long-term midspan deflection of long-span continuous rigid frame of the existence of box girder bridge. The deflection on the increase affects the service life of the bridge and driving comfort. Concrete creep has more influence on long-term deflection of long-span continuous rigid, one of seven holes （87 ＋ 5 × 162 ＋ 87） m for the engineering background of long span continuous rigid frame bridges, Through establishing the finite element model, analyzing the factors of different specifications, loading-age and bridge paving layer, we analyze the effect of concrete creep of long-span continuous rigid frame bridge.