Durability and Cover Cl

Durability and Cover
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  Durability and Cover Cl. (2) C nom = C min + ΔC dev C min = max{C min,b ; C min,dur  } C min,b  from Table 4.2 (generally bar size) C min,dur   from BS 8500 UK: IRISH N.A. & IS EN 206 ΔC dev  = 10mm UK N. A.  Cover for Fire Protection EN 1992-1-2 Typical dimensions / axis distance to satisfy fire resistance Fire Beam One-way solid slab Braced column Resistance Simply Continuous Simply Continuous Exposed on Exposed on Supported b min  /a Supported h min  /a one side more that one b min  /a (mm) (mm) h min  /a (mm) (mm) b min  /a side (mm) b min  /a (mm) R60 120/40 120/25 80/20 80/10 155/25 250/46 160/35 200/12 350/40 200/30 300/25 R90 150/55 150/35 100/30 100/15 155/25 350/53 200/45 250/25 450/40 300/40 400/35 R120 200/65 200/45 120/40 200/20 175/35 350/57 240/65 300/35 450/51 300/55 450/35 500/50 500/30 R240 280/90 280/75 175/65 280/40 295/70 350/80 500/60 500/75 650/60 700/70 700/50 Notes b min,  h min = beam or column width a = axis distance, generally distance to centre of reinforcing bar    Section 5 Structural Analysis 5.1.1 Common idealisations of the behaviour used for analysis are: ã  linear elastic behaviour (Cl. 5.4) ã  linear elastic behaviour with limited redistribution (Cl. 5.5) ã  plastic behaviour at ULS including strut and tie models (Cl. 5.6) ã  non-linear behaviour (Cl. 5.7) 5.2 Geometric imperfections Structure assumed to be out of plumb with inclination of 1/200. Analysis must include an equivalent horizontal load acting with the other actions such as wind 5.8 second order effects with axial loads (columns)  Load Cases and Combinations Continuous Beams 5.1.3(1) permits analysis based on either: (a) Alternate spans carrying the design variable and permanent load , and other spans carrying the permanent load (b) Any two adjacent spans carrying the variable and permanent load, and all other spans carrying only the design permanent load UK NA recommends (a), which leads to three load cases considered

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Aug 4, 2018
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