Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Ghajari, Farjam Asghari; Yousefpour, Hossein

doi:10.1002/suco.202200927

Cited by 9 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, it appears that using Equations ( 1) and (2) may lead to reasonable lower-bound estimates of the residual strength of concrete and reinforcing steel after exposure to elevated temperatures. Generally similar observations have been made from two other separate studies 33,34 that procured the materials from a similar source.…”

Section: Mechanical Propertiessupporting

confidence: 71%

Residual behavior of reinforced concrete corbels after exposure to elevated temperatures

Amani

Yousefpour

2023

Structural Concrete

Self Cite

View full text Add to dashboard Cite

Many precast concrete structures make use of corbels, which are small cantilevers that transfer eccentric point loads to columns or walls. When such structures experience a fire event, the residual strength of their corbels may need to be evaluated. This paper examines the residual behavior of reinforced concrete corbels exposed to elevated temperatures. Sixteen full‐scale double‐corbel specimens with two shear span‐to‐depth (a/d) ratios and different reinforcement layouts were fabricated and tested in ambient conditions or after exposure to temperatures of 550°C and 780°C. The load–displacement behavior, failure mode, and load‐carrying capacity of the specimens were investigated. Exposure to 550°C and 780°C reduced the strength of the specimens by up to 22% and 51%, respectively and increased the displacement at failure between 100% and 150%. The strut‐and‐tie method in ACI 318‐19 provided conservative estimates of the residual capacities of heat‐affected corbels if calculations are based on residual mechanical properties at the surface or average mechanical properties between surface and core of the specimens. When exposed to heat, corbels with smaller a/d ratios showed better strength retention if horizontal distributed reinforcement is used while corbels with larger a/d ratios better retained their strength if employing bidirectionally distributed reinforcement.

show abstract

Section: Mechanical Propertiessupporting

confidence: 71%

Residual behavior of reinforced concrete corbels after exposure to elevated temperatures

Amani

Yousefpour

2023

Structural Concrete

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fire and high temperature can cause thermal stress and rapid evaporation of water in building structures, which can increase the internal pore pressure and lead to irreversible, permanent damage such as explosion and spalling (1,2). To minimize the damage, the building structures after fire exposure need to have sufficient strength, stiffness, and stability (3,4). Therefore, enhancing the high-temperature resistance of concrete structures has become a research hotspot.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Liu,

et al. 2024

Mater. constr.

View full text Add to dashboard Cite

This research investigated the bond properties at high temperatures and with hybrid fiber addition between basalt fiber reinforced polymer (BFRP) bars and hybrid fiber-reinforced concrete (HFRC). The tensile strength and appearance morphology of BFRP bars were analyzed. Used scanning electron microscopy (SEM) to examine the microscopic morphology and used the bond-slip constitutive model to fit the bond-slip curves. When BFRP bars after exposed to 300 °C, their tensile strength dropped by 42%. With the increasing temperature, the bond strength and stiffness of normal concrete (NC) specimens decreased by 27.3 % and 67.5 %, respectively, while HFRC specimens decreased by 20.8 % and 55 %, respectively. Hybrid fibers increased the bond strength and stiffness of HFRC specimens by 27.1 % and 49.1 %, respectively. The best fitting models were the Malvar model and the Continuous Curve model.

show abstract

Influence of end restraint strength on the structural fire behavior and deterioration mechanism of RC frame beams

Lu,

Zhao,

et al. 2024

Structural Concrete

View full text Add to dashboard Cite

The end restraint strength of the reinforced concrete (RC) beams under the fire conditions may greatly influence the inner force redistribution and the structural behavior of the beams, even the stability of the whole structure. The structural fire behavior of two full‐scale frame beams with different end restraint strength under load were studied based on experiment and simulation. The temperature field, reinforcement strain, beam deflection, end axial displacement, and rotation angle of the structure during the whole heating and cooling process were measured. The influence of end restraint strength on the structural behavior was analyzed. The results show that the vertical displacement, axial force, end bending moment, and angular displacement first increase rapidly, then decrease gradually and become stable in the whole process; the lateral displacement increases first and then stabilizes; the change of axial and rotational deformations appeared to be non‐proportional with the corresponding restraining forces, reflecting that the axial and the rotational restraint strength at the ends of the beams decreased with the rise of temperature. The restraining strength of beams that submitted to fire globally decreased faster, and leading to a severe fire response and an earlier failure of the structure. The analysis results and the conclusions will supply scientific basis for the fire‐resistance design and safety evaluation on complex structures.

show abstract

Residual bond‐slip behavior in reinforced concrete members exposed to elevated temperatures

Cited by 9 publications

References 20 publications

Residual behavior of reinforced concrete corbels after exposure to elevated temperatures

Residual behavior of reinforced concrete corbels after exposure to elevated temperatures

Investigation of the bond properties between hybrid fiberreinforced concrete and BFRP bars after exposure to high temperature

Influence of end restraint strength on the structural fire behavior and deterioration mechanism of RC frame beams

Contact Info

Product

Resources

About