连续刚构桥施工阶段徐变效应对梁体受力的影响

Influence of creep effect of continuous rigid frame bridge during construction on the stress of bridge beams

使用有限元软件ANSYS建立某连续刚构桥有限元实体模型,分析施工阶段徐变效应对主梁线形及应力的影响。计算结果表明:施工阶段混凝土徐变对线形及应力影响显著,施工时应予以重视,可通过调整立模标高或启用备用束消除徐变对线形的影响。

A finite element software ANSYS is used to establish a finite element solid model of a continuous rigid frame bridge,and the influence of creep effect on the alignment and the stress of the main beam during the construction is analyzed. The results show that the influence of concrete creep on the alignment and the stress during the construction is significant,which should not be ignored during the construction,and the influence of creep effect on the alignment can be eliminated by adjusting the elevation of the vertical mold or by enabling the spare steel beam.