Title:
BOND CHARACTERISTICS OF REINFORCED NORMAL-STRENGTH CONCRETE BEAMS AT ELEVATED TEMPERATURES
Author(s):
Pattamad Panedpojaman and Thanyawat Pothisiri
Publication:
Structural Journal
Volume:
111
Issue:
6
Appears on pages(s):
1351-1362
Keywords:
bond; elevated temperature; finite element model; reinforced concrete beam; tensile splitting crack
DOI:
10.14359/51687098
Date:
11/1/2014
Abstract:
A series of fire tests have been conducted to examine the bond characteristics of reinforced concrete (RC) beams with two different concrete covers of 25 and 40 mm (0.98 and 1.58 in.) at elevated temperatures. The load-deflection relationships and the crack patterns of the test beams were observed during the experimental investigation. An analytical study has also been carried out for the test beams by assuming two types of bonding: perfect bond and slip bond. It has been found that the modeling results agree well with the test data. The finite element models with perfect bond and slip bond yield similar results in terms of the crack pattern and the tensile force distribution along the reinforcing bar. However, only the finite element model with slip bond is capable of predicting the tensile splitting cracks that may cause failure of the test beams,
while the finite element model with perfect bond tends to overestimate the bond stresses.