# Design of reinforced concrete columns. Type of columns. Failure of reinforced concrete columns. Short column. Long column

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1 Design of reinforced concrete columns Type of columns Failure of reinforced concrete columns Short column Column fails in concrete crushed and bursting. Outward pressure break horizontal ties and bend vertical reinforcements Long column Column fails in lateral bucklin 1

2 See test picture from web-site below part-3.html See picture from web-site belo struct-walls.htm Short column or Long column? ACI definition For frame braced against side sway: Long column if kl u /r > 34-12(M 1 /M 2 ) or 40 For Frame not braced against side sway: Long column if kl u /r > 22 Where k is slenderness factor, l u is unsupported length, and r is radius of gyration. M1 and M2 are the smaller and larger end 2

3 moments. The value, (M 1 /M 2 ) is positive if the member is bent in single curve, negative if the member is bent in double curve. Determine the slenderness factor, k The slender factor, k should be determined graphically from the Jackson and Moreland Alignment charts. (Charts will be added later) where ψ Ε( = c Ι c /l c ) of column / Ε( b Ι b /l b ) of beam, is the ratio of effective length factors. E c and E c are younger modulus of column and beams. l c and l c are unbraced length of column and beams. The cracked moment of inertia, Ι c is taken as 0.7 times gross moment of column and Ι b is taken as 0.35 times gross moment of inertia of beam. Alternatively, k can be calculated as follows: 1. For braced frame with no sway, k can be taken as the smaller value of the two equations below. k = (ψ A +ψ B ),1 k = (ψ min ) 1 3

4 ψ A and ψ B are the ψ at both ends, ψ min is the smaller of the two ψ values. 2. For unbraced frame with restrains at both ends, For ψ m < 2 k = [(20- ψ m )/20] (1+ψ m ) For ψ m 2 k = 0.9 (1+ψ min ) ψ m is the average of the two ψ values. 2. For unbraced frame with restrain at one end, hinge at the other. k = ψ ψ is the effective length factor at the restrained end. Example: Beam information: Beam size: b = 18 in, h = 24 in Beam unsupported length: l b = 30 ft Concrete strength: 4000 psi Young's modulus, E b = = ksi Moment of inertia of beam: I b = 0.35bh 3 /12 = 7258 in 4. Column information: Square Column: D = 18 in, unsupported length l c =10 ft 4

5 Concrete strength: 5000 psi Young's modulus: E c = = ksi moment of inertia of column: I c = 0.7D 4 /12 = 6124 in 4. Column top condition: There are beams at both sides of column at top of column, no column stop above the beams The effective length factor: ψ Α Ε( = c Ι c /l c ) /[2 Ε( b Ι b /l b )] = 1.4 Column bottom condition: There are beams at both sides of column at bottom of column and a column at bottom level The effective length factor: ψ Α Ε( 2[ = c Ι c /l c )] / [2 Ε( b Ι b /l b )] = 2.8 From chart: If the column is braced: k 0.84 If the column is unbraced: k 1.61 From equation If the column is braced: k = (ψ A +ψ B ) = 19.0 k = (ψ min ) = 29.0 If the column is unbraced: ψ m = (ψ A +ψ B )/2 = 2.12 k = 0.9 (1+ψ min ) = 1.6 Design of reinforced concrete columns Short column Long non-sway column & Long sway columns 5

6 1. Column shall be designed to resist factored axial compressive load and factored moments. 2. Column strength shall be determined based on strain compatibility analysis. 1. Column shall be designed to resist factored axial compressive load. Factored moment shall be magnified with magnification factors. 2. Column strength shall be determined based on strain compatibility analysis. Column ties and spiral ACI code requirements for column ties 1. No. 3 ties for longitudinal reinforcement no. 10 bars or less, no. 4 ties for no. 11 bars or larger and bundled bars. 2. Tie spacing shall not exceed 16 diameter of longitudinal bars, 48 diameters of tie bars, nor the least dimension of column. 3. Every corner bar and alternate bars shall have lateral tie provide the angle shall not exceed 135 degree. 4. No longitudinal bar shall be spacing more than 6 inches without a lateral tie. 6

7 ACI code requirements for spiral 1. Sprial shall be evenly space continuous bar or wire, no. 3 or larger. 2. Sprial spacing shall not exceeds 3 in, nor be less than 1 in. 3. Anchorage of spiral shall be provided by 1-1/2 extra turn. Design of short columns Design of long non-sway columns Design of long column with sway 7

8 Design of short concrete columns Strength of column subjected to axial load only Ideally, if a column is subjected the pure axial load, concrete and reinforcing steel will have the same amount of shortening. Concrete reaches its maximum strength at 0.85f c ' first. Then, concrete continues to yield until steel reaches its yield strength, f y, when the column fails. The strength contributed by concrete is 0.85f c (A g -A st ), where f c ' is compressive strength of concreter, A g is gross area of column, A st is areas of reinforcing steel. The strength provided by reinforcing steel is A st f y. Therefore, the nominal strength of a reinforced concrete column, is P n = 0.85f c (A g -A st )+A st f y [1] For design purpose, ACI specify column strength as follows For a spiral column, the design strength is φp n = 0.85φ[0.85f c (A g -A st )+A st f y ] [2] For a regular tie column, the design strength is φp n = 0.80φ[0.85f c (A g -A st )+A st f y ] [3] 8

9 where φ is strength reduction factor. For spiral column φ 57.0 = (ACI ), φ 7.0 = (ACI , 05). For spiral column φ 7.0 = (ACI ), φ 56.0 = (ACI , 05) The factors 0.85φ and 0.8φ are considering the effect of confinement of column ties and strength reduction due to failure mode. Nevertheless, column loads are never purely axial. There is always bending along with axial load. Strength of column subjected to axial load and bending Consider a column subjected to axial load, P and bending moment, M. Axial load, P produces an uniform stress distribution across the section while bending moment produces tensile stress on one side and compressive stress on the other. Strain and stress distributions of short concrete column at failure and interactive diagram Assumption: 1. A plan section remains a plan at failure. Strain distributes linearly across section 2. Concrete fails at a strain of Reinforcing steel fails at a strain of Axial load only (moment = 0) Moment only 9

10 Failure occurs when concrete strain reaches Failure occurs when ste Large axial load with small moment Failure occurs when concrete strain reaches Small axial load Failure occurs when 10

11 Balanced condition Failure occurs when concrete strain reaches and steel strain reaches at the same time. Interaction dia 11

12 Design aid: The interaction diagrams of concrete column with strength reduction factor is available on ACI design handbook. The vertical axis is φp n /A g and the horizontal axis is φm n /A g h, where h is the dimension of column in the direction of moment. The chart is arranged based on the ratio, γ which is the ratio of the distance between center of longitudinal reinforcements to h. 12

13 Column strength interaction diagram for rectangular column with γ =0.6 (Coursey of American Concrete Institute) 13

14 ACI design handbook can be purchase from ACI book store. The title is "SP-17: Design Handbook: Beams, One-Way Slabs, Brackets, Footings, Pile Caps, Columns, Two-Way Slabs, and Seismic Design in accordance with the Strength Design Method of " Design of short concrete column Design requirements: 1. Design strength:φp n P u and φm n M u 2. Minimum eccentricity, e = M u /P u.1.0 Design procedure: 1. Calculate factored axial load, P u and factored moment, M u. 2. Select a trial column column with b and column depth, h in the direction of moment. 3. Calculate gross area, A g and ratio, γ = distance between rebar/h. 4. Calculate ratio, P u /Ag and M u /A g h. 5. Select reinforcement ratio,,ρ from PCA design chart based on concrete strength, f c ', steel yield strength, f y, and the ratio, γ. 6. Calculate area of column reinforcement, A s, and select rebar number and size. 7. Design column ties. 14

15 Design example: Example: A 12"x12" interior reinforced concreter short column is supporting a factored axial load of 350 kips and a factored moment of 35 kip-ft. Desogn data: Factored axial: P u = 350 kips Factored moment: M u = 35 ft-kips Compressive strength of concrete: f c '= 4000 psi Yield strength of steel: f y = 60 ksi Requirement: design column reinforcements. Column size: b = 12 in, h = 12 in Gross area, Ag = 144 in 2. Concrete cover: d c = 1.5 in Assume #4 ties, d t = 0.5 in and #6 bars, d s = 0.75 in Calculate γ ( =h - 2 d c -2 d t - d s )/h = 0.6 Calculate, 15

16 P u /A g = 300/144 = 2.43 ksi, M u /A g h = 35/[(144)(12)] = From ACI design handbook, reinforcement ratio, ρ = Area of reinforcement, A s = (0.0018)(144) = 2.6 in 2. Use 6#6, area of reinforcement, A s = (6)(0.44) = 2.64 in 2. Check Bar spacing, s = (h - 2 dc - 2 dt - ds)/2 = in (O.K.) Calculate minimum spacing of column ties: 48 times of tie bar diameter = (48)(0.5) = 24 in 16 times of longitudinal bar diameter = (16)(0.75) = 12 in Minimum diameter of column = 12 in Use #4 ties at 12 inches on center. 16

17 Design of long column in non-sway frame (ACI ,05) Moment magnification for columns in braced frames (nonsway) For a slender column in a braced frame that is subjected to axial compression and moments. If M 1 is the smaller and M 2 is the larger moment, the moment need to be design for magnified moment if the ratio kl u /r > Μ( Μ/ 2 ) where k is slenderness ratio, l u is unsupported length, r is radius of gyration. k shall not be taken as 1 unless analysis shows that a lower value is justified. Μ 1 Μ/ 2 is positive if the column is bent in single curve and Μ 1 Μ/ 2 is not to be taken less than -0.5 (kl u /r = 40). The design moment shall be amplified as M c = δ ns M 2 where δ ns = C m /(1-P u /0.75P c ) 1 is moment magnification factor for non-sway frame, C m = (M 1 /M 2 )

18 P u is factored column load, and P c = π 2 (/ΙΕkl u ) 2 is Euler's critical buckling axial load, EI shall be taken as EI = (0.2E c I g +E s /I se )/(1+β d ) or EI = 0.4E c I g /(1+β d ) Where is the ratio of maximum factored axial dead load to total factored load Example: A 12"x12" interior reinforced concrete column is supporting a factored axail dead load of 200 kips and a factored axial live load of 150 kip. Factored column end moments are -35 kip-ft and 45 kip-ft. The column is a long column and has no sway. Design data: Total Factored axial: P u = 350 kips Factored moment: M 1 = -35 kips, M 2 = 45 kips (bent in single curve) Compressive strength of concrete: 4000 ksi Yield strength of steel: 60 ksi Unsupported length of column: 10 ft 18

19 Requirement: Determine the magnified design moment Column size: b = 12 in, h = 12 in Gross area: Ag = 144 in 2. Concrete cover: 1.5 in Assume #4 ties and #8 bars, d t = 0.5 in, d s = 1 in Gross moment of inertia: I g = (12 in) 4 /12 = 1728 in 4. Radius of gyration, r = (1728/144) = 3.5 in or r = 0.3(12 in) = 3.6 in Assume slenderness factor, k = 1 without detail analysis Slenderness factor, klu/r = (1)(120 in)/3.6 in = 35 > 34-12(35/45) = 25, long column Young's modulus of concrete, E c = = ksi Elastic modulus of steel: E s = ksi Assume 1% area of reinforcement: As = (0.01)(144 in 2 ) =1.44 in 2. Assume half of the reinforcement at each side of column, distance between rebas = *2-0.5*2-1 = 7 in 19

20 Moment of inertia of steel reinforcement: I se = (0.72 in 2 )(7/2) 2 *2 = 17.6 in 4. The ratio of factored load, β d = 200/350 = 0.57 The flexural stiffness, EI = 0.4E c I g /(1+β d )= 0.4(3605)(144)/(1+0.57) = 1.58x10 6 kip-in 2. or EI = (0.2E c I g +E s /I se )/(1+β d ) 11.1 = )75.0+1(/])6.71()00092(+)441()5063( 2.0[ =x10 6 kip-in 2. The critical load, P c = π 2 (/ΙΕkl u ) 2 = π 2 (1.58x10 6 )/(35) 2 = 1087 kip Factor Cm = (35/45) = Moment magnification factor, δ ns = C m /(1-P u /0.75P c ) = (0.911)/[1-350/1087] = 1.6 The magnified design moment, M c = 1.6 (45) = 71.8 ft-kip 20

21 Design of long column in sway frame Moment magnification for columns in unbraced frames (sway) Determine if the frame is a sway frame 1. The frame can be assumed as non-sway if the end moment from second-order analysis not exceeds 5% of the first-order end moment. 2. The frame can be assumed as non-sway if stability index, Q = P u ο / V u l c 50.0 where P u and V u are the total vertical load and the story shear, ο is the first-order relative deflection between the top and bottom of that story due to V u, and l c is the length of the column. 3. The moment need not to be design for magnified moment if the ratio kl u /r 22 where k is slenderness ratio, l u is unsupported length, r is radius of gyration. Calculating magnified moments 21

22 If M 1 is the smaller and M 2 is the larger moment, the design moment shall be amplified as M 1 = M 1ns +δ s M 1s M 2 = M 2ns +δ s M 2s where M 1ns and M 2ns are moments from loadings that are not contribute to sway (i.e. gravity load), and M 2s and M 2s are moments from loading that contribute to sway (i.e. wind and seismic) 1. The magnified sway moment δ s M s can be determined by a second-order analysis based on the member stiffness reduced for crack section. 2. The magnified sway moment can be calculated as δ s M s =M s /(1-Q) Μ s when 1 δ s The magnified sway moment can be calculated as δ s M s =M s /[1- P u /(0.75 P c )] Μ s where P u is the summation for all the factored vertical loads in a story and P c = π 2 (/ΙΕkl u ) 2 is the summation of critical bucking loads for all the columns in a story from non-sway frame. 22

24 Dead load moment: M D11 = -35 ft-kips, M D12 = 45 ft-kips Lateral load moment: M W11 = -75 ft-kips, M W12 = 80 ft-kips Column 2 & 3 (interior columns) Live load moment: M L21 = -15 ft-kips, M L22 = 25 ft-kips Dead load moment: M D21 = -30 ft-kips, M L22 = 40 ft-kips Lateral load moment: M W21 = -65 ft-kips, M W22 = 75 ft-kips Compressive strength of concrete: f c ' = 4000 psi Yield strength of steel: f y = 60 ksi Unsupported length of column: l u = 10 ft Requirement: Calculate magnification design moments for column 2 and Calculate total factored loads Column 2 & 3: P u = (P L2 +P D2 +P W2 ) = 720 kips All column: P u = (P L1 +P D1 +P W1 +P L2 +P D2 +P W2 ) = 2220 kips Column size: b = 18 in. h = 18 in. Gross area of column: Ag = bh = 324 in 2. Assume concrete cover: 1.5 in for interior column Assume #4 ties, d t = 0.5 in and #8 bars, d s = 1 in, for vertical reinforcement Calculate gross moment of inertia of column: I g = bh 3 /12 = 8748 in 4. Radius of gyration, r = I g /A g = 5.2 in 24

25 Assume slenderness factor, k =2 for moment frame with sidesway, the slenderness ratio, k l u /r = 46. > 22 (long column) Young's modulus of concrete, E c = 57 () = ksi Elastic modulus of steel: E s = ksi Assume 1% of reinforcement area, A s = 0.01 A g = 3.24 in 2. Assume that reinforcement are placed equally at each side of the column, the distance between vertical reinforcement is 18-2(1.5)-2(0.5)-1 = 12 in the moment of inertia of reinforcement, I se = As (13/2) 2 = 137 in 4. Factor, β d = P D2 /(P D2 +P L2 +P W2 ) = The stiffness factor, EI = (0.2E c I g +E s /I se )/(1+β d ) 16.6 =x10 6 kipin 2. or EI = 0.4E c I g /(1+β d ) 11.8 =x10 6 kip-in 2. Calculate magnification factor for non-sway moment: P c = π 2 (/ΙΕkl u ) 2 = 1390 kips. Assume C m = 1 (Transverse load at top and bottom of column) δ ns = C m /[1-P u /(0.75P c )] = Calculate magnification factor fo sway moment: Euler's critical buckling axial load of all columns, P c = π 2 (/ΙΕkl u ) 2 x 4 = 5558 kips. The moment magnification factor, δ s = 1/[1- P u /(0.75 P c )] =

26 Magnified design for column 2 and 3, M u2 = δ ns (M L22 +M D22 )+δ s (M W2 ) = ft-kip 26

27 27

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