Numerical Analysis of Key Influences Factors of Creep and Shrinkage Performance of Composite Beams

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Han, Chunxiu^1 ; Lan, Shuwei^2 ; Yao, Kaicheng^2 ; Zhang, Jiuchang^1

Department of Civil Engineering, Yunnan Minzu University, Kunming, Yunnan

650504, China^1

Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan

650224, China^2

关键词: Bending rigidity;    Composite beam;    Concrete creep;    Creep and shrinkages;    Internal forces;    Steel beams;    Steel concrete composite beam;    Stress redistribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012047/pdf
DOI  :  10.1088/1755-1315/218/1/012047

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Based on concrete creep mechanics and finite element method, the key influence factors of creep and shrinkage are analysed numerically to evaluate the long-Term mechanical properties of the steel-concrete composite beams. A constraint coefficient is adopted to judge the constraint degrees of the steel beam in the composite beam. Finite element analyses are conducted on 8 kinds of sections in the composite beams with different constraint degrees. The analyses indicate the axial and bending rigidities increase with the section height of the steel beam, which lead to an increase in both constraint degrees and distributed internal forces. The final internal forces of the concrete slab decrease and the internal forces of the steel beam increase, that is, the reduced internal forces in the concrete slab are transferred to the steel beam. The variations of deflections also increase with the constrain degrees, which show the same trend when the increase of constraints. It can be seen that the constraint degrees of the steel beam in the concrete are the key influence factors that cause stress redistribution and deformation change of the composite beams.