Buckling of Radially Loaded Concrete Cylinders in Fire Condition
Abstract
Concrete cylinders are commonly used in water treatment and sewerage plants, in the form of wells or basins. They are mainly subjected to axial compression resulting from soil lateral pressure and aqueous hydrostatic pressure, in case of the presence of a groundwater table; that is why they are mostly designed in the form of a circular hollow section. Concrete cylinders face a complicated case of loading in fire condition, as a result of material degradation in addition to thermally induced stresses. This paper studies buckling stability of that case where, a concrete cylinder is subjected to an internal fire load in addition to superimposed structural loads from the surrounding environment. The main objective of the research is to study buckling stability of concrete cylinders through identifying various structural and thermal parameters, controlling that behaviour. Finite element modelling using "Ansys 18.1" has been chosen as an approach to deal with the research problem. Twenty-five solid elements models have been prepared to study both thermal and structural behaviour of concrete cylinders in fire condition. Cylinder thickness, slenderness ratio, load ratio, and groundwater presence have been adopted as main research parameters to identify their effect on well's fire buckling endurance, in accordance with ISO 834 standard fire curve. A parametric study has been designed to study fire endurance vulnerability to cylinder thickness ranging from 50 mm up to 800 mm; diameter to thickness ratio [D/t] ranging from "10" up to "160"; full spectrum of structural load ratios; in addition to the presence of a surrounding groundwater. Outputs of the parametric study have been introduced in the form of figures, which could be used as preliminary design aids to identify buckling fire endurance as function of load ratio for various spectrums of thickness and slenderness ratios. Moreover, critical thicknesses and load ratios have been revealed.
Keywords
References
Tu, Min, Jun Deng, and Yi Wang. “Experimental Study on Heat Transfer of Concrete at High Temperatures Under Hygrothermal Environment.” Edited by H. Li, M. Ashraf, O. Corbi, P. Yang, L. Wang, and I. Corbi. MATEC Web of Conferences 275 (2019): 02020. doi:10.1051/matecconf/201927502020.
Ghavami, Parviz. “Mechanics of Materials” (2015). doi:10.1007/978-3-319-07572-3.
Kumar, Anish, Sovan Lal Das, and Pankaj Wahi. “Instabilities of Thin Circular Cylindrical Shells Under Radial Loading.” International Journal of Mechanical Sciences 104 (December 2015): 174–189. doi:10.1016/j.ijmecsci.2015.10.003.
Papadakis, George. “Buckling of Thick Cylindrical Shells Under External Pressure: A New Analytical Expression for the Critical Load and Comparison with Elasticity Solutions.” International Journal of Solids and Structures 45, no. 20 (October 2008): 5308–5321. doi:10.1016/j.ijsolstr.2008.05.027.
Corradi, Leone, Lelio Luzzi, and Fulvio Trudi. “Collapse of Thick Cylinders Under Radial Pressure and Axial Load.” Journal of Applied Mechanics 72, no. 4 (2005): 564. doi:10.1115/1.1938204.
Lewis, G.K. “Shape Factors in Conduction Heat Flow for Circular Bars and Slabs with Various Internal Geometries.” International Journal of Heat and Mass Transfer 11, no. 6 (June 1968): 985–992. doi:10.1016/0017-9310(68)90004-5.
ACI, Committee Report 216-R-2001,"Guide for Determining the Fire Endurance of Concrete Elements".
Euro code 2 Part 1-2 –October 2001,"Design of Concrete Structures-Part 1-2: General rules-Structural fire design ".
ANSYS, Theory reference, release 18.1, ANSYS, Inc., USA, Academic Edition, 2018.
Shah, S. N. R., F. W. Akashah, and P. Shafigh. “Performance of High Strength Concrete Subjected to Elevated Temperatures: A Review.” Fire Technology (March 5, 2019). doi:10.1007/s10694-018-0791-2.
Shu, Qianjin, Limin Lu, Guanglin Yuan, Chongshuo Zhong, and Bin Xu. “Experimental Investigation on the Mechanical Properties of Early-Age Concrete after Heating up to 550 °C.” European Journal of Environmental and Civil Engineering (March 23, 2019): 1–15. doi:10.1080/19648189.2019.1578269.
Nguyen, Giang D., and Alexander M. Korsunsky. “Development of an Approach to Constitutive Modelling of Concrete: Isotropic Damage Coupled with Plasticity.” International Journal of Solids and Structures 45, no. 20 (October 2008): 5483–5501. doi:10.1016/j.ijsolstr.2008.05.029.
Dimitris I. Diamantidis. “Limit State Analysis of Submerged Concrete Cylinders.” ACI Structural Journal 85, no. 1 (1988). doi:10.14359/2975.
Meloni, Paola, Fausto Mistretta, Flavio Stochino, and Gianfranco Carcangiu. “Thermal Path Reconstruction for Reinforced Concrete Under Fire.” Fire Technology (March 12, 2019). doi:10.1007/s10694-019-00835-7.
Delepine-Lesoille, S., I. Planes, M. Landolt, G. Hermand, and O. Perrochon. “Compared Performances of Rayleigh, Raman, and Brillouin Distributed Temperature Measurements During Concrete Container Fire Test.” Edited by Youngjoo Chung, Wei Jin, Byoungho Lee, John Canning, Kentaro Nakamura, and Libo Yuan. 25th International Conference on Optical Fiber Sensors (April 23, 2017). doi:10.1117/12.2263449.
Foster, S, I Burgess, and R Plank. “Investigation of Membrane Action in Model Scale Slabs Subject to High Temperatures.” Fourth International Conference on Advances in Steel Structures (2005): 933–940. doi:10.1016/b978-008044637-0/50138-4.
Mueller, Kevin A., and Yahya C. Kurama. “Out-of-Plane Behavior and Stability of Five Planar Reinforced Concrete Bearing Wall Specimens Under Fire.” ACI Structural Journal 112, no. 6 (November 2015). doi:10.14359/51687908.
Hsu, Teng H. Structural Engineering and Applied Mechanics Data Handbook, Volume 3: Plates. Vol. 3. Gulf Professional Publishing, 1990.
Harmathy, T.Z., and M.A. Sultan. “Correlation between the Severities of the ASTM E119 and ISO 834 Fire Exposures.” Fire Safety Journal 13, no. 2–3 (May 1988): 163–168. doi:10.1016/0379-7112(88)90011-2.
DOI: 10.28991/cej-2019-03091326
Refbacks
- There are currently no refbacks.
Copyright (c) 2019 Abdelraouf Tawfik Kassem
This work is licensed under a Creative Commons Attribution 4.0 International License.
