Svetha, V and Harinadha Reddy, D and Ramaswamy, A (2018) Response of structural concrete assemblages to thermo-mechanical loads. In: 40th IABSE Symposium in Nantes 2018: Tomorrow's Megastructures, 19 - 21 September 2018, Nantes, S3-37-S3-44.
Full text not available from this repository.Abstract
Fire represents one of the extreme loads that a structure may experience during its design life. In reinforced concrete (RC) structures, the mechanical properties of both concrete and steel deteriorates with rise in temperature. In addition, concrete subjected to elevated temperature shows two kinds of spalling, namely, explosive spalling and thermal spalling. In the present study a three-dimensional (3D) finite element (FE) model that accounts for not only the hygral and thermal effects but also the bond-slip and transient thermal strains for accurate prediction of the behaviour of RC assemblages under combined mechanical and thermal loads is presented. The model considers the degradation of material properties (and the uncertainty associated with their values) with increase in temperature. A hygro-thermal analysis is included for the estimation of temperature and pore pressure variations. Specific attention is paid in explicitly modelling the interfacial bond-slip behaviour between steel reinforcement and the surrounding concrete. The strength of the model is evaluated through the simulation of benchmark problems that includes axial members, flexural members and a RC frame assembly. A comparison of the fire resistance values obtained from the model against those determined from the code-based approaches shows that the code based values are un-conservative in most cases, especially when it involves high strength concrete or very high/low load ratios.
| Item Type: | Conference Paper |
|---|---|
| Publication: | IABSE Symposium, Nantes 2018: Tomorrow's Megastructures |
| Publisher: | International Association for Bridge and Structural Engineering (IABSE) |
| Additional Information: | The copyright for this article belongs to the International Association for Bridge and Structural Engineering (IABSE). |
| Keywords: | Degradation; Fire resistance; High performance concrete; Mechanical properties; Reinforced concrete; Spalling; Thermal load; Thermoanalysis, Coupled modeling; Estimation of temperatures; High strength concretes; RC assemblages; Steel reinforcements; Thermo mechanical loads; Threedimensional (3-d); Vapour pressures, Structural design |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 19 Aug 2022 04:52 |
| Last Modified: | 19 Aug 2022 04:52 |
| URI: | https://eprints.iisc.ac.in/id/eprint/75965 |
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