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Restraining Stress Calculation of Shrinkage Compensation Concrete Wall Considering the Temperature History

Author: GuoKai
Tutor: YuLin
School: Huazhong University of Science and Technology
Course: Structural Engineering
Keywords: shrinkage compensation concrete basement RC wall temperature stress finite element simulation
CLC: TU755
Type: Master's thesis
Year: 2007
Downloads: 66
Quote: 0
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Abstract


Shrinkage compensation concrete (SCC) is an effective way to avoid shrinkage cracks of basement RC wall, which has been popularly used for cracking control in large buildings and extra long structures, but designing methods of SCC are still at the phase of experience and estimation. As a result, the indeterminacy and the reliability of the designing method are reduced and some SCC application in projects falls flat, that would restrict the generalization and application of the SCC undoubtedly. So developing more reasonable calculating method is an important research subject both having great significance in SCC theories and projects.In this thesis, the principle of SCC would be introduced firstly. Then the thesis gave an introduction of shrinkage compensation patterns with small, moderate and absolute restrictions. Also the combined dry and cold shrinkage compensation patterns of mass concrete and large section concrete were obtained. Based on these theories, the approach of ultimate deformation and compressive strain of a basement SCC wall in Wuhan 30 days after casting was taken as an example.Taking advantage of software ANSYS, the simulation analysis of the temperature field and the temperature stress field of the basement SCC wall mentioned before during construction period were achieved comprehensively. At the same time the relationship between interior and exterior restraints in this kind of structure and the temperature history effect on expansion simulation of SCC were studied too. Comparing the temperature stress results of simulation analysis with the empirical methods’, the former one can forecast the pre-pressing stress and crack resistant effect of the expansion agent more exactly in accordance with the distribution and variation disciplines of temperature stress in SCC wall. The SCC designed reasonably can prevent not only the shrinkage cracks during construction period effectively, but also the cracks brought by dry shrinkage during working life.At last, this thesis compared six influencing factors on designing, structure, materials and construction, which are embedded column spacing, embedded column rigidity-wall rigidity ratio, construction bars, casting length, wall thickness and formwork materials. The research conclusions are very useful for temperature cracks preventing and controlling of the basement RC wall in designing and construction.

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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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