1 / 12

Thermal Analysis of a 1 Hour Fire Resistive Joint Design for Architectural Expansion Joints

Thermal Analysis of a 1 Hour Fire Resistive Joint Design for Architectural Expansion Joints. Preliminary Final Report Jason Shaw. Architectural Expansion Joints are Openings Between Concrete Slabs in a Building. Engineered into a building to permit movement

pilar
Download Presentation

Thermal Analysis of a 1 Hour Fire Resistive Joint Design for Architectural Expansion Joints

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Thermal Analysis of a 1 Hour Fire Resistive Joint Design for Architectural Expansion Joints Preliminary Final Report Jason Shaw

  2. Architectural Expansion Joints are Openings Between Concrete Slabs in a Building • Engineered into a building to permit movement • Thermal loading (i.e., change of season) • Wind loading • Seismic activity • Building codes often require fire resistive systems be installed in these joints to restrict the passage of smoke, heat, and flames • Fire barriers are tested to UL 2079 • Acceptance criteria: Temperature rise ≤139 K

  3. COMSOL Multiphysics is Used to Generate the Thermal Model Unexposed Side Concrete Steel Cover Plate Steel “L” Bracket Air Gap Ceramic Fiber Insulation Fire Side

  4. COMSOL Model Parameters • Thermal Stress Physics • Isotropic, linear elastic material • Quasi-static structural transient behavior • Surface to surface radiation • Radiation in participating media • Time dependent – 0 to 3,600 seconds (1 hour) in 100 second time steps

  5. COMSOL Model Boundary Conditions • Convective Cooling • Applied to the unexposed side • Radiation and convective heat transfer coefficients are manually calculated and applied

  6. COMSOL Model Boundary Conditions • Heat Flux • Applied to the fire side boundary • Fire temperature in accordance with ASTM E119, approximated by the following equation • Heat transfer in fluids • Applied to the air gap

  7. COMSOL Results • Initial fire barrier design did not satisfy the temperature rise criteria

  8. COMSOL Results

  9. COMSOL Results

  10. Recommendations • Increase steel “L” bracket size from 2x1 to 2x2

  11. COMSOL Results • Increase steel “L” bracket size results in lower temperatures on the unexposed surface of the fire barrier

  12. COMSOL Results

More Related