crack width check bs5400 4
DESCRIPTION
Crack Width Check BS5400 4TRANSCRIPT
Check ScheduleCheck ScheduleItemDateCheckerContact EmailCommentsCrack width10-May-07Tayeb [email protected] issue
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Crack-width-check STSK Consulting LtdDOCUMENT No.(Project / Doc)SHEET No.DateSUBJECTPREPARED BY:REFCALCULATIONSOUTPUTBS 5400 pt 4Crack widthC.L. 5.8.8.2acris distance from the point (crack) considered to the surface of the nearest bar which controls the crack width;Cnom is the required nominal coverdc is the depth of the concrete in compression (if dc is 0 use BS5400 Pt 4 Eq. 26)his the overall depthemis the calculated strain at the level where cracking is being considered, allowing for the stiffening effect of the concrete in the tension zone;but shall not be greater thane1e1is the calculated strain at the level where cracking is being considered, ignoring stiffening of the concrete in the tension zone;btis the width of the section at the level of the centroid of the tension steel;a'is the distance from the compression face to the point at which the crack width is being calculated;Mgis the moment at the section considered due to permanent loads ;Mqis the moment at the section considered due to live loads;esis the calculated strain in the tension reinforcement, ignoring the stiffening effect of the concrete in the tension zone;Asis the area of tension reinforcementbMg=47.4KNmMq=164.6KNmEc=30.8kN/mmShort termxEc=27.36KN/mmIntermediate valuedEs=205KN/mmb1000mmBar spacing150mmBar dia.25mmCnom45mmCover76mmThickness500mma'469mm(equals h unless cover is more than nominal)acr=82.0052908572mmm = Es / Ec=205/27.4=7.5Taking first moment of area about the neutral axisAs=3272.4923458333mmx =119.64mm(dc)-173.9Not acceptableSecond moment of areaI=3.13E+09mm4Stress(steel) =2.1E+08x7.5x(411.5-40)=188.79N/mm3.1E+09349188.79x(469-119.64)=0.0011205000x(411.5-119.64)em=1.10E-03w=0.2270297675mm0Allowable crack width =0.25mm0.2270297675