Experimental Analysis of Steel Beams Subjected to Fire Enhanced by Brillouin Scattering-Based Fiber Optic Sensor Data


This paper presents high temperature measurements using a Brillouin scattering-based fiber optic sensor and the application of the measured temperatures and building code recommended material parameters into enhanced thermomechanical analysis of simply supported steel beams subjected to combined thermal and mechanical loading. The distributed temperature sensor captures detailed, nonuniform temperature distributions that are compared locally with thermocouple measurements with less than 4.7% average difference at 95% confidence level. The simulated strains and deflections are validated using measurements from a second distributed fiber optic (strain) sensor and two linear potentiometers, respectively. The results demonstrate that the temperature-dependent material properties specified in the four investigated building codes lead to strain predictions with less than 13% average error at 95% confidence level and that the Europe building code provided the best predictions. However, the implicit consideration of creep in Europe is insufficient when the beam temperature exceeds 800°C.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Distributed Fiber Optic Sensors; Fire; Nonuniform Temperature Distribution; Structural Safety And Reliability; Thermo-Mechanical Analysis; Brillouin Scattering; Building Codes; Codes (Symbols); Fiber Optics; Reliability Analysis; Steel Beams And Girders; Steel Fibers; Strain; Temperature Distribution; Temperature Measurement; Temperature Sensors; Thermocouples; Voltage Dividers; Distributed Temperature Sensor; High Temperature Measurement; Structural Safety; Temperature-Dependent Material Properties; Thermal And Mechanical Loadings; Thermo-Mechanical Analysis

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2017 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Jan 2017