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<p>The present study endeavours to investigate and evaluate the behaviour of prestressed hollow core slabs after exposure to elevated temperatures and compare the response with unheated slabs. The adverse impact of elevated temperatures is studied by conducting full-scale investigation on nine hollow core slabs at room temperature and after exposure to elevated temperatures of 500&#xa0;°C and 600&#xa0;°C using T500 and T600 heating curves. The failure mode of slabs is examined for depth of 150&#xa0;mm, 200&#xa0;mm, and 250&#xa0;mm by considering the symmetric partial heating scenario applied on the top and bottom surface of the slab. All the heated slabs exhibited consistent behaviour in terms of cracking characteristics and failure patterns. Slabs heated using T500 and T600 curves resulted in a decrease in ultimate load carrying capacity of 150&#xa0;mm slab by 6% and 20%, 200&#xa0;mm slab by 10% and 15%, 250&#xa0;mm slab by 5% and 9% compared with unheated slabs. Analytical investigation is performed using ABAQUS and a maximum variation of 10% is observed for temperature distribution and load-deflection characteristics. Parametric study to investigate the influence of varying temperature curves and shear span-to-depth (<i>a/d</i>) ratios on hollow core slabs is conducted for 200&#xa0;mm slab depth. Localized temperature curve reduced the load-carrying capacity of slab at a higher rate and ultimate load decreased by 36% in comparison with unheated slab. Shear mode of failure is observed at <i>a/d</i> of 4, and flexural mode of failure with greater deflection is observed at <i>a/d</i> of 6 and 10.</p>

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Behaviour of prestressed hollow core slabs after exposure to elevated temperatures: an experimental and numerical approach

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • T M Jeyashree,
  • P R Kannan Rajkumar

摘要

The present study endeavours to investigate and evaluate the behaviour of prestressed hollow core slabs after exposure to elevated temperatures and compare the response with unheated slabs. The adverse impact of elevated temperatures is studied by conducting full-scale investigation on nine hollow core slabs at room temperature and after exposure to elevated temperatures of 500 °C and 600 °C using T500 and T600 heating curves. The failure mode of slabs is examined for depth of 150 mm, 200 mm, and 250 mm by considering the symmetric partial heating scenario applied on the top and bottom surface of the slab. All the heated slabs exhibited consistent behaviour in terms of cracking characteristics and failure patterns. Slabs heated using T500 and T600 curves resulted in a decrease in ultimate load carrying capacity of 150 mm slab by 6% and 20%, 200 mm slab by 10% and 15%, 250 mm slab by 5% and 9% compared with unheated slabs. Analytical investigation is performed using ABAQUS and a maximum variation of 10% is observed for temperature distribution and load-deflection characteristics. Parametric study to investigate the influence of varying temperature curves and shear span-to-depth (a/d) ratios on hollow core slabs is conducted for 200 mm slab depth. Localized temperature curve reduced the load-carrying capacity of slab at a higher rate and ultimate load decreased by 36% in comparison with unheated slab. Shear mode of failure is observed at a/d of 4, and flexural mode of failure with greater deflection is observed at a/d of 6 and 10.