Experimental Nonlinear Flexural Capacity Curve of Fiber Reinforced Concrete under Direct Fire

Beheshti, Seyed Saeed; Safi, Mohammad; Rahmani, Khosro

doi:10.22065/jsce.2024.432873.3327

Experimental Nonlinear Flexural Capacity Curve of Fiber Reinforced Concrete under Direct Fire

Document Type : Original Article

Authors

Seyed Saeed Beheshti ¹

mohammad safi ²

Khosro Rahmani ³

¹ Energy Conversion Group, Mechanical Engineering Faculty, Shahid Beheshti University

² Associate Professor, Dept.of civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran

³ Material and Metallurgy Group, Mechanical Engineering Department, Shahid Beheshti University

10.22065/jsce.2024.432873.3327

Abstract

In this article, the effects of the heating and cooling process on the flexural behavior and nonlinear capacity of these components have been investigated by conducting several tests on concrete beams with long and short polymer fibers exposed to direct fire. Based on this, it has been shown that the effect of direct flame can significantly change the ductility of the beam structure. It has been shown that the cooling phase of fire has a great effect on the reduction of ductility. The type of reinforcement and its amount in concrete beams make many changes on the flexural behavior and ductility of the structure. The results of the tests on 12 series of samples showed that increasing the number of long fibers beyond a certain limit can significantly increase the energy absorption capacity and durability of the structure in direct flame conditions, while short fibers had little effect on this issue. Most of them have helped to reduce the scaling of concrete superficially. In the results of this article, an algorithm for the design of flexural concrete beams based on the philosophy of the capacity spectrum method has been presented. This method can be used to evaluate existing structures against real fire scenarios.

Keywords

Fiber concrete

direct flame

ductility

flexural behavior

durability

Subjects

Structural Fire Engineering

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