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Research of Temperature Field and Temperature Stress in Construction Period of the Raft Board Less Than 1 Meter

Author: LuoJiang
Tutor: YangYanKe
School: Southwest Jiaotong University
Course: Structural Engineering
Keywords: The raft board less hydration heat the temperature field temperature stress MIDAS
CLC: TU755
Type: Master's thesis
Year: 2009
Downloads: 11
Quote: 3
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Abstract


As the rapid economic development our country, the mass concrete arises in quantity in the normal industrial and civil construction buildings. But the research on the comparatively small mass concrete used in the normal buildings is not deep enough and comprehensive, the covering area in the related codes are limited and narrow. Many problems in construction practice have to be solved by the experience, without the supports of theories. It leads to much unnecessary waste of labor, material and financial resources, the result of quality-control is unsatisfactory, too, especially the raft board less than one meter was given temperature control for safety in construction practice. In connection with this phenomenon, the research in this article mainly includes:1) The temperature field and calculation method of stress with creep are introduced according to the heat-conduction theory based on a large number of references, and the resources of the parameter and equations in the calculation are given in this article.2) Analysis of the mass concrete are improved and verified, according to the first principles of FEM, and considerations of the influence of creep.3) As an example, the temperature curve is given based on tests of the raft boards less than one meter of HaoTing Business building in ChengDu. The possible maximum difference between internal temperature and the external one, and the pulling stress are estimated by theoretical calculation, compared with the measured value.4) The possible maximum difference between internal temperature and external one, as well as the maximum pulling stress on the raft board less than one miter are estimated based on the theoretical analysis in diversity of settings include:different intensity levels, different dosage of cement and different casting temperature and so on. The finite elements analyze software MIDAS is used to give a full analysis and verification.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Concrete and reinforced concrete works
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