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COLUMN BASE WSK CONNECTION
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1. COMPRESSION CAPACITY (Na)
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Na = Fp*A/1000 (kN)
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Fp*L2/2 = Sb*Fb
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L = tb/(3*Fp/Fb)1/2 (mm)
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STIFFENER PLATE CHECK
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Nstiff = Fp*((bf/2-15)*2*L-L2) /1000 (kN)
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ts,req'd = Nstiff/((Hs-R)*Fv)/1000 (mm)
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Ss,req'd = Nstiff/(2/21/2*Fw*(Hs-R)) /1000 (mm)
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2. SHEAR CAPACITY (Va)
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Va = n*Vb (kN)
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3. TENSION CAPACITY (Ta)
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Ta = min(T1,T2,T3 max(T4,T5)) (kN)
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T1 = n*Tb (kN)
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T2 = n*Sc*Fb/g/1000 (kN)
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T3 = 0.166*(fc')1/2*Ap (kN)
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T4 = n*Lt*db*π*τ/1000 (kN)
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τ=0.28*(fc')1/2*10.2/1.4*9.8/100 (N/mm2)
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T5=2*0.7*fc'*db*Lh/1.7/1000 (kN)
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4. COMBINED SHEAR AND TENSION
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All three formula shall be met.
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V <= Va (kN)
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T <= Ta (kN)
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V/Va + T/Ta <=1.4 -> V + αT <= 1.4Va (kN)
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α=Va/Ta
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WHERE ;
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A : CONCRETE AREA WHERE COLUMN LOAD TO BE DISTRIBUTED (mm2)
Fb : ALLOWABLE BEARING STRENGTH OF BASE PLATE
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A = 2*L*(d+bf-2*L) (mm2) FOR "w/o STIFFNER" TYPE
Fb = 176 (N/mm2)
(= 0.75*Fy)
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A = 2*L*(d+2*bf-4*L-30) (mm2) FOR "w/ STIFFNER" TYPE
Fp : ALLOWABLE BEARING STRENGTH OF CONCRETE
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Be: EFFECTIVE WIDTH OF BASE PLATE RESISTING A. BOLT TENSION (mm)
Fp =10.5(N/mm2)
(= 0.35*f'c)
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Be1 = 2*g+db (mm) FOR "INSIDE"
Fv : ALLOWABLE SHEAR STRENGTH
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Be2 = min(d/2, G/2+g+db/2) (mm) FOR "INSIDE"
Fv =94(N/mm2)
(= 0.4*Fy)
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db : BOLT DIAMETER (mm)
Fw : ALLOWABLE SHEAR STRENGTH OF FILLET WELD
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bhd : BOLT HOLE DIAMETER (mm)
Fw =117(N/mm2)
(= 21(ksi) FOR E70XX ELECTRODES)
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G : ANCHOR BOLT PITCH (mm)
Fy : SPECIFIED MINIMUM YIELD STRESS
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g : DISTANCE BETWEEN TENSION FORCE TO FIX POINT (mm)
Fy =235(N/mm2)
(FOR JIS G 3101 SS400)
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g = (G-tw)/2 (mm) FOR "INSIDE"
f'c: SPECIFIED COMPRESSIVE STRENGTH OF CONCRETE PER BS8110 GRADE C40
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Nstiff : COMPRESSIVE CAPACITY DUE TO STIFFENER (KN)
f'c =30(N/mm2)
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n : NUMBER OF ANCHOR BOLTS (pcs)
V : COMPUTED SHEAR FORCE
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Hs : HEIGHT OF STIFFENER PLATE (mm)
T : COMPUTED TENSION FORCE
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Sb : SECTIONAL MODULUS OF BASE PLATE IN UNITY (mm3/mm)
Va : SHEAR CAPACITY OF CONNECTION
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Sc : SECTIONAL MODULUS OF BASE PLATE AT CRITICAL SECTION FOR A. BOLT TENSION (mm3)
Ta : TENSION CAPACITY OF CONNECTION
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Sc = min(Be1,Be2)*tb2/6 (mm3) FOR "INSIDE"
α=Va/Ta
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Ss = FILLET WELD SIZE BETWEEN STIFFENER AND COLUMN WEB (mm)
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Tb : TENSION STRENGTH OF ANCHOR BOLT (kN)
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T1 : TENSION CAPACITY RESTRICTED BY ANCHOR BOLTS (kN)
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T2 : TENSION CAPACITY RESTRICTED BY BASE PLATE BEARING (kN)
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T3 : TENSION CAPACITY RESTRICTED BY PEDESTAL CONCRETE CONE STRENGTH (kN)
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T4 : TENSION CAPACITY RESTRICTED BY ANCHOR BOLTS BOND STRENGTH (kN)
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T5 : TENSION CAPACITY RESTRICTED BY CONCRETE BEARING STRENGTH AT ANCHOR BOLTS HOOK (kN)
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tb : BASE PLATE THICKNESS (mm)
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ts : THICKNESS OF STIFFENER PLATE (mm)
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Vb : SHEAR STRENGTH OF ANCHOR BOLT (kN)
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R : RADIUS OF COPES
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R ( mm )
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D≦17520
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175＜D≦30025
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300＜D30
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