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TB-Lecture06-Comparing-Codes

TB-Lecture06-Comparing-Codes - EGN-5439 Design of Tall...

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EGN EGN - 5439 Design of Tall Buildings 5439 Design of Tall Buildings Lecture 06 Lecture 06 Comparing International Codes - Fire - Seismic - Wind © L. Prieto-Portar, 2008
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Comparing Three International Codes: Comparing Three International Codes: 1) International Building Code (United States and Canada); 1) International Building Code (United States and Canada); 2) Eurocode (Europe); 2) Eurocode (Europe); 3) 3) Normas Normas T é cnicas cnicas Complementarias Complementarias (Mexico) (Mexico) .
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Fire Code Comparisons
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Fire Code Design Procedure IBC Based on Fire Resistant Rating (R) Calculation approach for non standard building procedure Provided Tables - Min. slab thickness. - Min. cover for main reinforcing bars of reinforced concrete beam. - Min. dimension of concrete column. Eurocode • Selection of the relevant design fire scenarios. • Determination of the corresponding design fires. • Calculation of temperature evolution within the structural members. • Calculation of the mechanical behavior of the structure exposed to fire.
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Minimum Requirements for Beams (IBC).
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IBC – Minimum Requirements for Fire Rating in Walls.
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IBC – Minimum Requirements for Fire Rating in Columns.
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IBC – Minimum Requirements for Fire Rating in Slabs.
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IBC – Minimum Requirements for Fire Rating in Slabs.
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Design Procedure (Eurocode) Member Analysis Analysis of Part of Structure Analysis of Entire Structure Determination of mechanical actions and boundary conditions Selections of mechanical actions Tabulated Data (National Annex) Simple Calculation Models Advance Calculation Models Simple Calculation Model (If available) Advance Calculation Model Advance Calculation Model
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Thermal action for temperature analysis. Thermal action are given by the net heat flux, h net where net,r net,c net h h h ° ° ° + = ( ) m g c net,c h Θ - Θ = α ° ( ) ( ) [ ] 4 4 273 273 + Θ - + Θ Φ = m r f m net,r h ε ε °
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Mechanical Analysis. Verification of Fire resistance: Time Domain: Strength Domain: Temperature Domain: requ fi d fi t t , , t d fi t d fi E R , , , , d cr d , Θ Θ
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Seismic Code Comparison Mexico City, 1985.
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Objective: To make sure that in the event of earthquakes: 1) Human lives are protected; 2) Damage of property is limited; and 3) Essential facilities remain operational. The Loading is Defined by the Design Spectrum (Soil Dependent). Recognize material behavior and structural type: Response Modification Factor ( R ) Analysis for earthquake loads: 1) Simplified; 2) Equivalent Static Analysis; and 3) Dynamic Analysis.
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Eurocode (2004) Fundamental Period of Building (T 1 ) For H ° 40m: T 1 = C t H ¾ For H > 40m: T 1 = 2 ± d [C T depends on the building structure] Total Base Shear F b = S d (T 1 ) m ² [Sd(T 1 ) = Ordinate of Design Spectrum] Response Modification Factor, Q Varies from 2 ~ 4.5 Design Spectrum Soil Classification Interstory Drift 0075 . 0 < δ Lateral Force ° ± ² s T T c 0 . 2 4 1 Distribution of Horizontal Seismic Forces [s i ,s j displacements of masses m i & m j ] ³ = j j i i b i m s m s F F
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IBC (2003) Spectral Response Acceleration 1 1 3 2 3 2 S F S S F S V D s a DS = = Response Modification Factor (R) Base Shear
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