大吨位预应力时混凝土局部应力的测试与分析

Measuring and Analysis of Local Stress in Concrete under Heavy Prestressing

大桥采用挂篮悬臂浇筑法施工,每个悬臂施工段张拉锚固两到四束纵向预应力束.为了掌握大桥结构局部受力情况,确保施工和结构安全,在橹尾撬大桥49#墩的2#块纵向预应力张拉施工时,测试了錨垫板附近箱梁混凝土的应变分布,进行了空间有限元分析,并对理论计算与实测进行了分析比较.

While the balanced cantilever construction is adopted, two to four longitudinal prestressed tendons are tensioned. To ensure the safety of construction and structure, the condition of local stress of the bridge structure should be investigated. When the prestressed tendons of Segment 2^# of Pier 49^# of Luweiqiao Bridge are tensioned, thc strain situation of the box - section beam concrete near the anchor plate is measured. The measured values are compared with the analytical values, which are obtained with space finite element method.