International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 09 | Sep 2022
p-ISSN: 2395-0072
www.irjet.net
FIRE RESISTANT ANALYSIS OF RC BEAM COLUMN JOINT Utkarsh Agnihotri, Vinayak Mishra*, Sidharth Jain** (M.Tech. Structural Eng.), Civil Engineering Department, Institute of Engineering and Technology, Lucknow, Uttar Pradesh *Assistant Professor, Civil Engineering Department, Institute of Engineering and Technology, Lucknow, Uttar Pradesh **Assistant Professor, Department of Civil Engineering, HBTU, Kanpur, Uttar Pradesh ----------------------------------------------------------------------***---------------------------------------------------------------------side should be under permissible limit of heat transfer, are Abstract two ways to control the spread of a fire. Engineering examination of the behaviour of structural components subjected to fire takes into account:
One of the biggest dangers to structures is fire. Because it is non-combustible and has a low heat conductivity, concrete behaves well in a fire. Concrete may serve as a cover to protect steel bar, which is why concrete frames performs well in a fire. For the purpose of analysing the behaviour of beam column junctions under fire, ANSYS software's finite element approach is used. The extent of a structural member's fire resistance is influenced by the number of exposed sides. As a result, the period to collapse varies greatly, and thermal analysis can determine this. According to the standard ISO 834 fire curve, temperatures are allocated to the various sides of the joint.
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LITERATURE SURVEY Bruce Eillingwood et al. (1991) describes reactions under fire-exposed RC structural elements. The fire tests in reference to 6 full-scale beams are running continuously over one support are given. Near continuous support, severe shear fractures appeared in all six beams. For predicting the thermal and structural response of exposed concrete beams, mathematical models have been developed. These models successfully predicted the behaviour of the trials for limit state design. 90 minutes after the fire started, shear cracks started to appear in all of the tested beams. After 30 minutes, flexural fractures appeared in the positive moment zone and quickly became larger. The temperature variation characteristics of RCC structure with respect to stiffness and strength, at high temperatures of steel and concrete, with capacity of the RCC frame to distribute equal pressures internally over the particular time period under exposer to the fire and its effect how reinforced concrete structures behave when subjected to flames.
Keywords: Beam Column joint, Temperature Analysis, FEA, ANSYS, ISO 834 fire curve
INTRODUCTION The most often utilised material in civil engineering projects, including anything from buildings to bridges, is concrete. The advantages of utilising concrete are its low cost, quick building time, availability, etc. But one of the advantages of utilising concrete that is sometimes disregarded is the fire safety it provides. It provides improved defence against the threat of fire in buildings. In the building sector, sustainability of structures is a key problem. High temperature exposure is an extreme circumstance that can cause material characteristics to change, which can affect the overall behaviour of a structural part. Due to variations in coefficients of thermal expansion, concrete behaves complexly when exposed to high temperatures. High strength concrete's mechanical characteristics at high temperatures differ from those of normal concrete in two key ways: first, there is a decrease in strength from temperature varying from 100°C to 400°C, and second, the HSC can spall. The coding and design requirements are taken into account while designing by taking strength loss into account.
Dietmar Hosser et al. (1994) conducted research on composite beams that were simply supported and linked to slabs of reinforced concrete. Finite element analysis has been used to develop a theoretical research for determining the effective slab width of composite concrete beams subjected to fire. Investigations are conducted into how the top transverse reinforcement in the concrete slab affects both fracture propagation and fire resistance. Any cross section's internal temperature field may be determined by doing a finite element analysis. Four Concrete slabs attached to composite beams are put to the test. A theoretical model was created using the ANSYS programme. The purpose of
A building assembly's capacity to resist the impacts of fire is referred to as having fire resistance. To restrict the occurrence of flames through cracks developed at exposed
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Fire exposure circumstances High-temperature material properties The structure's thermal response Heat-induced structural reaction when treaded as single unit
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