泉州后渚大桥施工阶段应力监测与成桥受力分析

Stress monitoring during construction and analysis of the static behavior under vehicle loading for the Houzhu bridge in Quanzhou

通过对泉州后渚大桥主桥施工阶段控制截面应力的监测,得到连续刚构桥施工直至全桥合拢箱梁截面应力分布规律,有限元模拟计算结果与实测结果基本吻合,都在设计允许范围内.以修正后的有限元模型为基础,模拟汽车荷载试验,计算了该桥在最不利汽车荷载作用下的应力和变形.结果表明:后渚大桥在设计汽车荷载作用下处于弹性状态,满足设计要求.

The Houzhu bridge is a pretressed concrete continuous rigid - framed bridge with five spans. This paper presents stress distributions along the depth of the key cross - sections during the construction of the bridge over half a year period. The stress from the finite element model inosculates well with that from field monitoring, and these stress values are all below the design allowable limit values. Furthermore, based on the calibrated finite element （FE） model, the stresses and deflections under the worst vehicle loadings were calculated. The calculation reveals that the bridge belongs to the elastic range. It can be concluded from the analysis and field monitoring that the Houzhu bridge satisfies the design requirements.