Abstract
To investigate fire‐resistance behaviors of simple supported reinforced concrete (RC) beams with three faces exposed to fire, six full‐scale specimens were designed in accordance with the principle of “strong bending and weak shearing.” One beam was treated as the control case of room temperature while the other five beams were exposed to high temperature. Parameters related to shear capacity were discussed, such as longitudinal reinforcement ratio and stirrup ratio. The experimental results show that brittle shear failure under room temperature may transfer to shear‐bend failure at high temperature due to thermal expansion and strength degradation of concrete and steel. The greater the longitudinal reinforcement ratio, the longer the failure time of specimens. It indicates that the pinning action of longitudinal reinforcement can significantly improve the shear capacity of beams under high temperature. In addition, the configuration of stirrup reinforcement can effectively reduce the brittle change of vertical deflection when the beam enters the failure stage.
Highlights
Reinforced concrete (RC) beams present thermal deformations under fire. e mechanical properties of steel and concrete degrade at high temperature due to changes of internal physical parameters, the fire-damaged reinforced concrete (RC) members may not be able to perform expectedly. erefore, it is of great significance to strengthen the investigation on the fire resistance of RC members or the entire RC structure
Dwaikat and Kodur [6] presented results from fire resistance experiments on six RC beams to illustrate the comparative performance of high-strength concrete (HSC) and normal-strength concrete (NSC) beams exposed to fire
One of them is used as the reference to carry out fourpoint-bending tests at ambient temperature in determining the ultimate load bearing capacity. e other five beams are used to carry out the fire resistance tests with three faces exposed to high temperature following the standard ISO 834 fire curve [22]. at is, they are first subjected to impact loadings and exposed to fire with a constant load. e effectiveness of longitudinal reinforcement ratio and stirrup ratio on fire resistance of RC beams are evaluated in particular
Summary
Reinforced concrete (RC) beams present thermal deformations under fire. e mechanical properties of steel and concrete degrade at high temperature due to changes of internal physical parameters, the fire-damaged RC members may not be able to perform expectedly. erefore, it is of great significance to strengthen the investigation on the fire resistance of RC members or the entire RC structure. Fu et al [2] tested two full-scale prestressed steel reinforced concrete (PSRC) supported beams under thermodynamics coupling, investigating the distribution of temperature field, vertical deformation characteristics, and bearing performance deterioration process. Faris et al [4] carried out fire resistance tests on ninety-nine high and normal strength concrete elements subjected to elevated temperatures, with a focus on explosive spalling. Many researchers used finite element software to study the fire resistance performance of members under high temperature [13,14,15,16,17,18,19,20,21]. E other five beams are used to carry out the fire resistance tests with three faces exposed to high temperature following the standard ISO 834 fire curve [22]. One of them is used as the reference to carry out fourpoint-bending tests at ambient temperature in determining the ultimate load bearing capacity. e other five beams are used to carry out the fire resistance tests with three faces exposed to high temperature following the standard ISO 834 fire curve [22]. at is, they are first subjected to impact loadings and exposed to fire with a constant load. e effectiveness of longitudinal reinforcement ratio and stirrup ratio on fire resistance of RC beams are evaluated in particular
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