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A platform for research: civil engineering, architecture and urbanism
Structural Behaviour of Prestressed Concrete Hollow Core Slabs Under Elevated Temperature
A 3-D finite element model predicting the behaviour of prestressed concrete hollow core slabs under elevated temperature is presented for simulating its behaviour under actual fire. Study on understanding the fire behaviour is essential for developing the hollow core slab with greater fire endurance. The model is developed incorporating the temperature-dependent material and thermal properties of M40 concrete grade as per Eurocode EN 1992-1-2 and the inelastic behaviour of concrete is accounted for by providing plasticity parameters. The effect of prestressing is taken into account and the interaction between prestressing tendons and concrete is modelled to ensure its actual behaviour for heat transfer analysis. Coupled temperature analysis is carried out to simulate the thermal and structural responses of hollow core slabs under elevated temperatures. The temperature distribution along the depth of the slab and time-deflection curve is obtained for the developed model and the accuracy of the model is predicted. Further, a parametric study is carried out by varying the different fire scenarios to decide the fire curve. Also, the critical factors governing the structural behaviour of prestressed concrete hollow core slabs under elevated temperature are investigated by varying boundary conditions (in terms of axial constraints) and span/depth ratio. Results from the analytical investigation show that the axial constraints and span/depth ratio have a significant influence on the failure mechanism and behaviour of prestressed hollow core slab under elevated temperature. Also, the developed Finite Element model can be used to determine the critical factors required for performance-based fire safety design of hollow core slab for varying design parameters.
Structural Behaviour of Prestressed Concrete Hollow Core Slabs Under Elevated Temperature
A 3-D finite element model predicting the behaviour of prestressed concrete hollow core slabs under elevated temperature is presented for simulating its behaviour under actual fire. Study on understanding the fire behaviour is essential for developing the hollow core slab with greater fire endurance. The model is developed incorporating the temperature-dependent material and thermal properties of M40 concrete grade as per Eurocode EN 1992-1-2 and the inelastic behaviour of concrete is accounted for by providing plasticity parameters. The effect of prestressing is taken into account and the interaction between prestressing tendons and concrete is modelled to ensure its actual behaviour for heat transfer analysis. Coupled temperature analysis is carried out to simulate the thermal and structural responses of hollow core slabs under elevated temperatures. The temperature distribution along the depth of the slab and time-deflection curve is obtained for the developed model and the accuracy of the model is predicted. Further, a parametric study is carried out by varying the different fire scenarios to decide the fire curve. Also, the critical factors governing the structural behaviour of prestressed concrete hollow core slabs under elevated temperature are investigated by varying boundary conditions (in terms of axial constraints) and span/depth ratio. Results from the analytical investigation show that the axial constraints and span/depth ratio have a significant influence on the failure mechanism and behaviour of prestressed hollow core slab under elevated temperature. Also, the developed Finite Element model can be used to determine the critical factors required for performance-based fire safety design of hollow core slab for varying design parameters.
Structural Behaviour of Prestressed Concrete Hollow Core Slabs Under Elevated Temperature
Lecture Notes in Civil Engineering
Saha, Suman (editor) / Sajith, A. S. (editor) / Sahoo, Dipti Ranjan (editor) / Sarkar, Pradip (editor) / Jeyashree, T. M. (author) / Kannan Rajkumar, P. R. (author)
2022-10-05
11 pages
Article/Chapter (Book)
Electronic Resource
English
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