Long-Term Structural Responses of Orifices in Gravity Dams Considering Thermal and Creep Effects
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 3
Abstract
A numerical simulation method is presented to analyze the thermal and creep effects on structural performance of orifices in gravity dams during construction and operation period. Time-dependent conditions such as the changes of gravity load and water pressure, the concrete viscoelastic material properties, and the variations of environment temperature are all considered for numerical modeling. Compared temperature results obtained from heat transfer analysis with the monitored data around orifice, proposed model is verified to be a reliable tool for thermal-structural coupling analysis. This paper discusses temperature distributions of orifice concrete surfaces in contact with water or air. Tensile stress evolutions arising from temperature variations are investigated correspondingly. Subsequently, cracking risks of orifice with different environments and locations are calculated to evaluate orifice structural performance. Thermal and creep effects on the distributions of tensile stress and cracking risk are studied simultaneously. Results show that long-term thermal and creep effects play important roles in the structural performance of orifice, and orifice concrete surface in contact with air located at the middle part of the dam has a higher cracking risk than surfaces in contact with air or water close to the upstream or downstream of dam.
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Acknowledgments
The authors gratefully appreciate the support from the State Key Laboratory of Hydraulic Engineering Simulation and Safety (Tianjin University), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (No. 51321065), the National Natural Science Foundation of China (No. 51379141), and Tianjin Research Program of Application Foundation and Advanced Technology (No. 13JCYBJC19400).
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 25, 2014
Accepted: Apr 14, 2015
Published online: Jun 11, 2015
Discussion open until: Nov 11, 2015
Published in print: Jun 1, 2016
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