Title:
Numerical Analysis of Tendon Temperature Considering Thermal Contact Conductance
Author(s):
Kwanwoo Yi and Thomas H.-K. Kang
Publication:
Structural Journal
Volume:
122
Issue:
4
Appears on pages(s):
97-111
Keywords:
concrete cover thickness; fire-resistance performance; numerical analysis; post-tensioned (PT) slab; tendon configuration; thermal contact conductance
DOI:
10.14359/51745642
Date:
7/1/2025
Abstract:
This study used finite element analysis to examine how tendon
configuration affects the temperature behavior of post-tensioned
concrete structures during fire exposure. The thermal behavior
of various tendon configurations was modeled, showing good
agreement with experimental data. Parametric studies found that
unbonded single-strand tendons (S) and prestressing (pretensioned)
strands (R) had lower thermal resistance than bonded
post-tensioned tendons (B), unbonded post-tensioned tendons (U),
and grouted extruded-strand tendons (G). The S and R specimens
stayed at or below the critical temperature for one-way slabs, validating current safety codes. The B, U, and G specimens remained
well below critical temperatures, indicating that a thinner concrete
cover might suffice. These findings highlight the need to consider
tendon configuration in structural fire-resistance evaluation and
incorporate heat resistance assessment to ensure the safety and
efficiency of prestressed concrete structures during fires.