Fire Behavior of Composite Beams With Simple Connections: Benchmarking of Numerical Models

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This paper focuses on the development and benchmarking of 3D finite element models for predicting the behavior
and failure of composite beams with simple (shear) connections subjected to gravity loads and fire conditions,
which include both heating and cooling phases. The simple connections included are the shear-tab, single angle,
and double-angle connections commonly used in the U.S. engineering practice. All the structural components
including the steel beam, concrete slab, shear connectors, and connection elements (bolts, plates, angles
etc.)were modeled in detail using appropriate finite elements, contact interaction models, and material and component
behavior at elevated temperature. The detailed finite element models were benchmarked using results
from large-scale tests of composite beams and connections subjected to fire loading including heating and cooling
phases. The numerical results including the midspan displacement histories and the connection rotation histories
were comparedwith thosemeasured experimentally by the authors. These comparisons indicate that the detailed
models reasonably predict the experimental deformation histories and observed failure modes. Themodelswere
used to provide additional insight into the axial forces developed in the connections, particularly during the
cooling phase, thus enhancing experimental findings. The benchmarked model is recommended for conducting
analytical parametric studies to supplement experimental investigations of composite beams and simple connections
under fire. 
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Fire Behavior of Composite Beams With Simple Connections: Benchmarking of Numerical Models
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