Title:
Behavior of Unbonded Post-Tensioned Concrete Slabs Exposed to Fire (Open Source)
Author(s):
Siyoung Park and Thomas H.-K. Kang
Publication:
Structural Journal
Volume:
120
Issue:
3
Appears on pages(s):
217-229
Keywords:
cover thickness; fire-resistance performance; tendon configuration; unbonded post-tensioned (PT) slab
DOI:
10.14359/51738512
Date:
5/1/2023
Abstract:
With the development and commercialization of post-tensioned (PT) concrete structures, concerns pertaining to structural safety for disasters and diverse conditions, such as fire and high temperatures, have emerged. To better understand fire-resistance performance, effects associated with cover thickness and tendon configurations for six unbonded PT concrete slabs were evaluated in regardto temperature changes, deflection, tendon tensile forces, and fire endurance/time. In addition, the factors and relationship between the extent of damage caused by concrete cracking/delamination and tendon force at post-tensioning were evaluated. Thermal resistance and deflection rates for materials such as galvanized steel duct or high-density polyethylene (HDPE) sheathing were also examined. It is the authors’ hope that the aforementioned informationidentifying parameters affecting fire-resistance performanceof PT slabs may be helpful to the practitioner when consideringtendon configurations for unbonded PT concrete structures.