Creep behavior of precast segmental box girder bridge

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Xihua, Dai^1 ; Liangfang, Liu^2 ; Rong, Xian^1

Guangdong Highway Construction Co., Ltd., China^1

School of Civil and Architectural Engineering, Nanchang Institute of Technology, China^2

关键词: Assembling process;    Calculation accuracy;    Calculation models;    Creep calculations;    Different stages;    Internal force and deformations;    Segmental constructions;    Service performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012138/pdf
DOI  :  10.1088/1755-1315/81/1/012138

来源: IOP

【 摘 要 】

The concrete creep effect is more obvious when the box girder is assembled by segment. It is necessary to consider the influence of the loading value of the section at different time and the different age of concrete at different stages. In this paper, ACI209R-92, CEB-FIP MC90 and B3 and other concrete creep models are compared. The results show that the B3 model has many factors to consider and the calculation accuracy is high. Secondly, this paper discusses the influence of the segmental construction technology on the creep calculation, and puts forward the characteristics of the stress analysis of the segmental box girder. Finally, on the basis of the B3 model of concrete creep, the Midas software is used to establish the calculation model of segmental box girder, and the internal force and deformation of the box girder are calculated. The results show that the internal force and deformation of the box girder is too large due to the poor integrity of the segmental assembling process, which will seriously affect the normal service performance.