approach slab design

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PROJECT: TR-4 LOCATION: STA. 57+839 NAME OF STRUCTURE: OVERPASS OP4 DESIGN OF APPROACH SLAB (SKEWED 55.18) Filename: Approach SlabAbutment Approach Slab (OP4) Input Data a. Dimensions 3654 Length of approach sla L = 3654 mm Approach slab thicknes = 300 mm Effective span length S = 2754 mm S b. Material data Concrete comp. strengt = 28 MPa Steel yield strength = 414 MPa Density of concrete = 24 c. Design data Strength reduction fac f = 0.90 Diameter of main bar = 20 mm Ratio = 0.85 Effective depth d = 240 mm Clear concrete cover = 50 mm Width of member b = 1000 mm Load Analysis a. Distribution width (main reinforcement parallel to traffic) E ### + 0.06 S < ### m = 1.384 m b. Dead load (consider 1.0 m strip) Slab = ### x 24 = 7.200 kN/m Total dead load = 7.200 kN/m c. Live load Impact factor I = ### / S + 38 = 0.39 use I = 0.30 Wheel load (HS 20-44) P = 72.000 kN Overload factor = 1.25 Live load = = 84.523 kN Design Moment a. Dead load = = 6.826 kN m b. Live load = = 58.194 kN m c. Design ultimate moment = 1.3 ( + 1.67 ) = 135.213 kN m Required Reinforcement a. Cracking moment Modulus of rapture = ### = 3.297 MPa Moment of inertia = = 0.00225 Distance = = 0.150 m Cracking moment = = 49.449 MPa = 59.339 MPa ts fc' fy gc kN/m 3 db b1 cc wDL OL PLL+I P (1 + I) OL / E PLL+I MDL wDL S 2 / 8 MDL MLL+I PLL+I S / 4 MLL+I MU MDL MLL+I MU fr fc' fr Ig b ts 3 / 12 Ig m 4 yt ts / 2 yt Mcr fr Ig / yt Mcr 1.2Mcr

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Approach Slab Design using AASHTO Standard

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PROJECT:TR-4LOCATION:STA. 57+839NAME OF STRUCTURE:OVERPASS OP4DESIGN OF APPROACH SLAB S!E"ED 55.#8$Filename: Approach SlabAbutment Approach Slab (OP4)I%&'( D)()a. Dimensions 3654Lenth o! approach slab L " 3654 mmApproach slab thic#ness " 3$$ mm%!!ecti&e span lenth S " '(54 mmSb. )aterial *ata+oncrete comp. strenth " ', )PaSteel -iel* strenth " 4.4 )PaDensit- o! concrete " '4c. Desin *ataStrenth re*uction !actor " $./$ Diameter o! main bar " '$ mm0atio " $.,5 %!!ecti&e *epth * " '4$ mm+lear concrete co&er " 5$ mm 1i*th o! member b " .$$$ mmL*)+ A%),-./.a. Distribution 2i*th (main rein!orcement parallel to tra!!ic)% ..'./ 3 $.$6 S 4 '..$$ m " ..3,4 mb. Dea* loa* (consi*er ..$ m strip)Slab " $.3$$ 5 '4 " (.'$$ #67m8otal *ea* loa* " (.'$$ #67mc. Li&e loa*9mpact !actor 9 " .5.'4 7 S 3 ::: " $.3,( use 9 " $.3$1heel loa* (;S '$)DL)LL39)>!r!c= !r9

b ts3 7 .' 9

m4-tts 7 ' -t)cr!r 9

7 -t)cr..')cr)inimum steel ratio = . < . < " $.$$',3?alance* steel ratio = = $.$',/.)a5imum steel ratio = = $.$'.6/b. ?ottom rein!orcement (main lonitu*inal rein!orcement)+oe!!icient o! resistance " " '.6$, )PaSteel rein!orcement ratio " . < . < " $.$$66/0e@uire* steel area " " .6$5.5Area o! main bar " " 3.4.'Spacin o! bars " " ./5.6, mm78 9*((*2 9)4. .&)60+ ) #58 22 60%(04 (* 60%(04 ( " '$/4.4 )c. Distribution rein!orcementDistribution 0ein!orcement shall be place* trans&erse to the main steel rein!orcement in the bottom o! allslabs to pro&i*e !or the lateral *istribution o! concentrate* li&e loa*s.For main rein!orcement parallel to tra!!icAB *istribution [ 5$ BB *istribution " ::: 7 S " 33.. B use B *istribution " 33.. BArea o! *istribution bars " " 6/4..SiCe o! *istribution rebar " .6 mmArea o! one bar " '$...Spacin o! rebars " " '/$ mm#: +/.(4/9'(/*% 9)4. .&)60+ )( #58 22 60%(04 (* 60%(04*. 8emperature an* shrin#ae rein!orcementSiCe o! 87S rebar " .' mmArea o! one bar " ..3.." '64.6Spacin o! rebars " " 4'( mm#7 (02&04)('40 )%+ .;4/%