Case Report
Temperature Variation on Concrete Structures- A Case Study
Corneliu BOB, Polytechnic University of Timisoara, Romania.
Received Date: January 04, 2021; Published Date: January 25, 2021
Introduction
During steaming of wood log a complex stress and strain state appear in the RC basins. The effect of this state on the behavior of the basins is presented (Figure 1) [1]. The basin structure elements were designed by taking into account the classical analysis which is characterized by next actions: permanent loads, the temperature action due to the difference between interior of basins (80-90°C) and the outdoors temperature (20°C), the earth pressure and wood log pressure. The different temperature action between the RC basin walls and the RC foundation was not taken into account (Figure 1).
![Click here to view Large Figure 1 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G001.png)
The Deformations due to Temperature Variation
It was calculated function of temperature on basin walls by using of well know procedure [2].
The temperature on the basin walls
![Click here to view Large Equation 1 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E001.png)
![Click here to view Large Equation 2 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E002.png)
![Click here to view Large Figure 2 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G002.png)
![Click here to view Large Equation 3 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E003.png)
Stress state from differential strain
The stress state due to different temperature of interior and outdoor of the wall is illustrated in Figure 3 (Figure 3).
![Click here to view Large Figure 3 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G003.png)
![Click here to view Large Equation 5 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E004.png)
![Click here to view Large Equation 6 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E006.png)
![Click here to view Large Figure 4 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G004.png)
![Click here to view Large Figure 5 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G005.png)
![Click here to view Large Equation 7 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E007.png)
![Click here to view Large Equation 8 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E008.png)
Critical axial force of the wall
The critical axial force of a wall, according to Timoshenko- Gere, is calculated and compared with the effort from differential deformation between the wall and the foundation [3] (Figure 5).
![Click here to view Large Figure 6 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G006.png)
![Click here to view Large Equation 10 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E010.png)
![Click here to view Large Equation 11 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E011.png)
![Click here to view Large Equation 12 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E012.png)
The check of detailing and wall reinforcement
The temperature differences on the two sides of the wall
![Click here to view Large Equation 13 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E013.png)
![Click here to view Large Equation 14 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E014.png)
![Click here to view Large Equation 15 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E015.png)
![Click here to view Large Equation 16 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E016.png)
![Click here to view Large Figure 6 irispublishers-openaccess-civil-structural-engineering](../images/irispublishers-openaccess-civil-structural-engineering.ID.000648.G006.png)
Conclusion
![Click here to view Large Equation 17 irispublishers-openaccess-civil-structural-engineering](../tables/irispublishers-openaccess-civil-structural-engineering.ID.000648.E017.png)
Acknowledgement
The investigations presented here are part of the research project of the “Building Construction Research Institute- Timisoara Branch” (INCERC).
Disclosure Statement
No potential conflict of interest was reported by the author.
References
- Bob C (2003) The deterioration causes of the basin structure elements from a wood log steaming complex (in Romanian), Timisoara, Ed. Mirton.
- Romanian Norms C 107-2005 and EN ISO 13789: Thermal performance of buildings-Transmission heat loss coefficient –calculation method.
- Timoshenko SP, Gere JM (1962) Theory of Elastic Stability. Second Edition Amazon.com.
- SR EN 1992-1-1:2004/AC: Eurocode 2 – Design of Concrete Structures–Part 1-1: General rules and rules for buildings.
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Corneliu BOB. Temperature Variation on Concrete Structures- A Case Study. Cur Trends Civil & Struct Eng. 6(5): 2021. CTCSE.MS.ID.000648.
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Structure elements, RC basin walls, Reinforcement, Bending moment, Axial force, RC foundation, Stress, Strain
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.