Influences of Shrinkage, Creep, and Temperature on the Load Distributions in Reinforced Concrete Buildings During Construction

• Published in: Tsinghua science and technology Vol. 14; no. 6; pp. 756 - 764
• Main Author: 方东平 席海峰 王晓明 张传敏
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2009; School of Civil Engineering, Tsinghua University, Beijing 100084, China%Urban Systems Program, CSIRO Sustainable Ecosystems, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Melbourne, VIC 3190, Australia%Henan Development and Reform Commission, Zhengzhou 450003, China
• Subjects: construction; creep and temperature; load re-distribution; reinforced concrete buildings; shrinkage; slab-shore interaction; structural characteristic parameter; 平板载荷; 收缩徐变; 施工过程; 混凝土建筑物; 混凝土收缩; 温度变化; 负荷分布; reinforced concrete buildings; creep and temperature; construction; structural characteristic parameter; shrinkage; load re-distribution; slab-shore interaction
• ISSN: 1007-0214; 1878-7606; 1007-0214
• DOI: 10.1016/S1007-0214(09)70146-4

Site measurements have shown that slab loads re-distribute, between the slabs during the concrete curing, while the external Ioadings and structural geometry remain the same. Some have assumed that this is caused by concrete shrinkage and creep, but there have been no studies on how these factors exactly influence the load distributions and to what degree these influences exist. This paper analyzes the influences of concrete shrinkage, creep, and temperature on the load re-distributions among slabs. Although these factors may all lead to load re-distribution, the results show that the influence of concrete shrinkage can be neglected. Simulations indicate that shrinkage only reduces slab loads by a maximum of 1.1%. Creep, however, may reduce the maximum slab load by from 3% to 16% for common construction schemes. More importantly, temperature variations between day and night can cause load fluctuation as large as 31.6%. This analysis can, therefore, assist site engineers to more accurately estimate slab loads for construction planning.