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A Comparison of the Fire Performance of Prestressed Concrete Double T-beams using Design Provisions and SAFIR By: Nickolas Hatinger
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Overview Introduction Structural Models Design Provisions SAFIR
Results Conclusions
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Introduction Prestressed/Precast Industry Buildings Parking Structures
Shopping Centers Prestressed concrete double T-beams Span-to-depth ratio Aesthetics High-quality manufacturing Constructability Low-maintenance
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Structural Models 2 prestressed concrete double t-beams
PCI 10DT24+2 (40 ft. span) PCI 12DT32+2 (50 ft. span) Simply Supported Normal Weight Concrete Carbonate Aggregates L = 100 psf and D = self-wt
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Properties and Dimensions
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Properties and Dimensions
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Design Provisions American Canadian European ACI 318, ACI 216.1, PCI
CSA CAN3-D-2.10, CPCI European EN , EN NIST, (2005)
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American Codes Tabulated Data Simplified Calculations
Beam: Cover, restraint, aggregate, beam width or cross-sectional area Slab: Concrete type, thickness Simplified Calculations Temperature plots: 1,2,3 & 4 hrs Material property plots Load Combination: 1.2D+0.5L
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Canadian Codes Tabulated Data Simplified Calculations
Beam: Concrete type, area of beam, cover Slab: Concrete type, thickness Simplified Calculations Temperature plots: 2 hr (ACI for 1, 3, and 4 hr) Material property plots Load Combination: D+L NIST, (2005)
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European Codes Tabulated Data Simplified Calculations
Beam: Beam width, avg. axis distance, web thickness, beam type Slab: Thickness Simplified Calculations Temperature plots: 1,2,3 & 4 hrs (ACI 216.1) Material property equations Load Combination: D+0.9L Advanced Calculations Guidelines for performance-based design
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SAFIR2004 Thermal-mechanical analysis computer program
Finite Element Method (FEM) Nonlinear material properties FR of structural members or assemblies
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Results 10DT24+2 FIRE RESISTANCE (hr.) Code: American Canadian
European Tabulated: 1 1/2 1 Simplified Calculations: SAFIR (min): 64 60 61 12DT32+2 FIRE RESISTANCE (hr.) Code: American Canadian European Tabulated: 1 1/2 1 Simplified Calculations: SAFIR (min): 92 86 87
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Conclusions Codes vs. Codes SAFIR vs. Codes
Tabulated Data for the Canadian code was slightly conservative Simplified Methods were identical Slabs governed tabulated fire ratings SAFIR vs. Codes 10DT24+2 consistent 12DT32+2 diverge
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Questions
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