A new algorithm for creep and shrinkage effects of composite beams

被引：0
|
作者：
Han C. [1 ]
Zhou D. [2 ]
Yao K. [2 ]
Lan S. [2 ]
机构：
[1] School of Electrical and Information Technology, Yunnan Minzu University, Kunming
[2] Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming
来源：
Zhou, Donghua (593416010@qq.com) | 1600年 / Huazhong University of Science and Technology卷 / 45期
关键词：
Adjustment coefficient; Composite beam; Concrete creep; Concrete shrinkage; Direct method; Practical calculation;
D O I：
10.13245/j.hust.170819
中图分类号：
学科分类号：
摘要：
To calculate creep and shrinkage effects of steel-concrete composite beams to forecast their long-term mechanical performances, a new algorithm named direct method was adopted. The material ratios, creep adjustment coefficients and shrinkage adjustment coefficients were derived. The formulas of time dependent stresses were obtained. Hence, cross section stresses of composite beam can be calculated similar to a single material section based on material mechanics theory. The analysis indicates the results of cross section stresses of composite beam by direct method are consistent with that by internal force distribution method. The direct method can be used in a wide range, such as simply supported composite beams, composite beams in frame and pre-stressed composite beams under actions of positive bending moment. It can be adopted to obtain adjustment coefficients, stresses and strains according to the internal force at the composite beam centroid with different constraint and load forms. It is a simple-useful method and supplement for a long-term mechanical calculation theory of composite beam. It can be directly applied in practical engineering calculations. © 2017, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.
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页码：99 / 104
页数：5
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