DESIGN OF CONCRETE BRIDGE ("T" Beam Type)1. DESIGN DATA 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Construction type Bridge length Beam length Span bridge Width of bridge Class of bridge Width of side walk Thick of asphalt pavement Thick of concrete slab Material strength and allowable stress a. Super structure - Concrete compressive strength s'bk - Allowable bending stress s'b - Reinforcing bar allowable stress sa a. Sub structure - Concrete compressive strength s'bk - Allowable bending stress s'b - Reinforcing bar allowable stress sa = = = = = = = = = = = = = = = = Reinforcement Concrete "T Beam" 5x 20.80 m 5x 20.70 m 5x 20.00 m 4.60 m I 2x 0.50 m 0.06 m 0.25 m

225.00 kg/cm 65.00 kg/cm 1400.00 kg/cm 225.00 kg/cm 65.00 kg/cm 1400.00 kg/cm

(K 225) (U 24) (K 225) (U 24)

2. 2.1

CALCULATION OF CARRIAGE FLOOR LIVE LOAD a. Impact coefficient (K) K = 1 + (20/(50+L)) where : L = length of span b. Effective width of slab (Le) Le = 0.72 L' + g where : L' = span of load between support g = width of wheel c. Moveable load (with impact) P1 = P/Le * K where : P = moveable load

= =

1.286 2.00 m

= = =

1.21 m 1.40 m 0.20 m

= =

12.77 ton 12.00 ton

2.2

DEAD LOAD - Slab floor - Pavement - Water - Hand rail - Side walk load

= = = (P2) = (q2) =

0.20 0.06 0.05

1.00 1.00 1.00

2.40 2.20 1.00 q1

0.20

1.00

2.20

= = = = = =

0.480 0.132 0.050 0.662 0.050 0.440

t/m t/m t/m t/m t t/m

2.3

STRUCTURAL ANALYSIS ON LOADING 0.80 P2 q2 A 1.30 0.280 B 2.00 1.44 0.280 C 1.30 D 0.625 P1 1.75 q1 P1 0.625 0.80 P1 = P2 q2 P2 = q1 = q2 = 12.772 t 0.050 t 0.662 t/m 0.440 t/m

3.

CALCULATION OF MOMENT

3.1

PRIMARY MOMENT MBA L1 L2 MBC L3 L4 MCB MCD = - P2*(L1+L2) - q2 L1 (1/2*L1 + L2) - 1/2 q1L2 = 0.80 m = -3.296 t m = 0.50 m = -(1/12 *q1* L) - (P1 * L3 * L4)/l - (P1 * L4 * L3)/L = = = MBC = MBA 0.28 1.72 = = = -3.296 t m -0.465 t m -1.880 t m = -0.465 t m

End Moment = (MBA + MBC)/2 3.2 MOMENT OF SPAN B - C

1.75 P1 q1 P1 P1 = P2 = q1 = q2 = 12.772 0.050 0.662 0.440 t t t/m t/m

B 2.00 1.44 0.280 RB RC 0 Mx 0.280 Mx = = < = < = 1/2 q L + 2P1 /2 x