Numerical Modelling of Continuous Composite Beam Under Fire Loading

The article is to show results of numerical and experimental examination of changes in wave propagation in a composite rod with additional mass. For numerical modelling the spectral element method is used. For experimental verification the IFFM PAS laboratory equipment was used. As actuators and sensors PZT elements were utilised. The results obtained via numerical and experimental simulations are compared and discussed.

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Numerical Modelling Of The Strengthening Process Of Steel-Concrete Composite Beams

Civil and Environmental Engineering Reports ◽

10.1515/ceer-2015-0056 ◽

2015 ◽

Vol 19 (4) ◽

pp. 99-110 ◽

Cited By ~ 1

Author(s):

Piotr Szewczyk ◽

Maciej Szumigała

Keyword(s):

Numerical Modelling ◽

Bearing Capacity ◽

Composite Beam ◽

Steel Plate ◽

Composite Beams ◽

Steel Beam ◽

Load Bearing Capacity ◽

Load Bearing ◽

Main Assumption ◽

The Cost

Abstract This paper presents the numerical modelling of strengthening a steel-concrete composite beam. The main assumption is that the strengthening is not the effect of the state of a failure of a structure, but it resulted from the need to increase the load-bearing capacity and stiffness of the structure (for example: due to a change in the use of the object). The expected solution is strengthening without the necessity to completely unload the structures (to reduce the scope of works, the cost of modernization and to shorten the time). The problem is presented on the example of a composite beam which was strengthened through welding a steel plate to the lower flange of the steel beam. The paper describes how energy parameters are used to evaluate the efficiency of structures’ strengthening and proposes an appropriate solution.

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Composite beams under fire loading: numerical modeling of behavior

Journal of Structural Fire Engineering ◽

10.1108/jsfe-06-2016-011 ◽

2016 ◽

Vol 7 (2) ◽

pp. 142-157 ◽

Cited By ~ 4

Author(s):

Kristi L. Selden ◽

Amit H. Varma

Keyword(s):

Composite Beam ◽

Failure Modes ◽

Concrete Slab ◽

Material Model ◽

Composite Beams ◽

Bottom Flange ◽

Stress Strain ◽

Content Type ◽

Beam Deflections ◽

Fire Loading

Purpose The purpose of this study was to develop a three-dimensional (3D) finite element modeling (FEM) technique using the commercially available program ABAQUS to predict the thermal and structural behavior of composite beams under fire loading. Design/methodology/approach The model was benchmarked using experimental test data, and it accounts for temperature-dependent material properties, force-slip-temperature relationship for the shear studs and concrete cracking. Findings It was determined that composite beams can be modeled with this sequentially coupled thermal-structural 3D FEM to predict the displacement versus bottom flange temperature response and associated composite beam failure modes, including compression failure in the concrete slab, runaway deflection because of yielding of the steel beam or fracture of the shear studs. Originality/value The Eurocode stress-strain-temperature (σ-ε-T) material model for structural steel and concrete conservatively predict the composite beam deflections at temperatures above 500°C. Models that use the National Institute of Standards and Technology (NIST) stress-strain-temperature (σ-ε-T) material model more closely match the measured deflection response, as compared to the results using the Eurocode model. However, in some cases, the NIST model underestimates the composite beam deflections at temperatures above 500°C.

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