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

作　　者：方东平 席海峰 王晓明 张传敏 

机构地区：[1]School of Civil Engineering,Tsinghua University [2]Urban Systems Program,CSIRO Sustainable Ecosystems,Commonwealth Scientific and Industrial Research Organisation(CSIRO) [3]Henan Development and Reform Commission

出　　处：《Tsinghua Science and Technology》2009年第6期756-764,共9页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Nature Science Foundation of China (Nos.50378051,70172005,and 70572007);Excellent Young Teacher Program of Ministry of Education of China;the National Science and Technology Planning Project (No.2006BAJ01B04-03)

摘　　要：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.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.

关 键 词：reinforced concrete buildings construction load re-distribution structural characteristic parameter slab-shore interaction SHRINKAGE creep and temperature 

分 类 号：TU375[建筑科学—结构工程]