PRECAST SQUARE COLUMN

Transcription

1 PRECAST SQUARE COUMN CODE OF COMPONENTS CS Product series 105 ap length to detail ink refer to schedule 1 1 ap length ap schedule Reinforcement ar Size (mm) ap ength (mm) Column Depth (300 mm) Column Width (300 mm) Types of (Square) Specification Installation Stage design a. ottom end shall be design as condition 1 whereas top end shall be designed as condition 4 (i.e. free cantilever), as per S 8110 Part 1 cl b. Minimum concrete grade C25. c. Madd = (Nh/2000)( )2 K in S 8110 Part 1 cl shall be computed by user and Madd shall be smaller than Mint R ink 2 2 ap length Typical Single Tier (3D view) Typical (Elevation-Single Tier)

2 106 PRECAST SQUARE COUMN ap length Typical Double Tier (3D view) to detail ink refer to schedule 1 R ink 2 ap length Typical (Elevation-Double Tier) 2 1 ap length ap schedule Reinforcement ar Size (mm) ap ength (mm) Specification Final Stage Design a. Resultant of design moment (M) in consideration of Mx, My, Mi, Mmin and Madd shall be computed by users. b. Ultimate force due to selfweight of precast beam, precast slab, beam top concrete infill, slab topping, superimposed dead load and live load shall be computed by user and total load shall be smaller than Nf. c. All end condition shall be designed as condition as per S 8110 Part 1: 1997 cl d. Minimum concrete grade C35 ( and cast in-situ concrete). e. All design is compliance with S 8110 Part 1:1997 and S 8110 Part 3:1985 f. For the design of ultimate moment capacity, main bar position is considered 110mm from face to main bar centre. g. Minimum concrete grade C25 for initial stage design. h. Concrete cover to main reinforcement = 40mm. i. Fire resistance = 2 hours. j. Characteristic of steel reinforcement igh tensile (T) fy = 460 N/mm 2 Mild steel (R) fyv = 250 N/mm 2 k. In order to control crack due to bending in, ultimate axial load at final stage must be greater than 0.2fcuAc l. If ultimate axial load is smaller than 0.2fcuAc and design moment governed, the shall be designed as beam and the above table is not applicable. m. The connection system between precast component and cast in-situ structure shall be referred to competent person. n. The design has been prepared in accordance with S 8110 (1997).

3 PRECAST SQUARE COUMN - DETAIS Installation Stage Design Final Stage Design / OR / Ni Mxi OR Myi Nf eam top in-situ concrete infill Mf ar 1 ar 2 ar 1 R ink ar Fixed or Section Fixed Mf Section 4-4 Section 1-1 Section 2-2 Type A (Main reinforcement = 4 nos) ar 1 ar 1 R ink ar 3 ar 3 ar 2 ar 2 Section 1-1 Section 2-2 ar 1 ar 3 ar 1 R ink ar 3 ar 4 ar 4 ar 2 ar 2 Section 1-1 Section 2-2 Type (Main reinforcement = 8 nos) Type C (Main reinforcement = 12 nos) Typical section of bars & links arrangement

4 Table 23 Square Column: i. For single-tier, maximum length, for the shall be limited to 3m and 4m. ii. For double-tier, maximum length, for the shall be limited to 6m, 7m and 8m. 108 CS CS CS CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m Ni (kn) Mxi OR Myi (knm) Nf (kn) Mxf OR Myf (knm) T16 2T R x T16 2T R x

5 109 CS CS CS CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m Ni (kn) Mxi OR Myi (knm) Nf (kn) Mxf OR Myf (knm) T16 2T R x x T32 2T R For reinforcement arrangement refer to page 105 page 107

6 Table 24 Square Column: i. For single-tier, maximum length, for the shall be limited to 3m and 4m. ii. For double-tier, maximum length, for the shall be limited to 6m, 7m and 8m. 110 CS CS CS CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m Ni (kn) Mxi OR Myi (knm) Nf (kn) Mxf OR Myf (knm) x T32 2T R T20 3T20 2T20-3R T25 3T25 2T25-3R x T32 3T32 2T32-3R

7 111 CS CS CS CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m Ni (kn) Mxi OR Myi (knm) Nf (kn) Mxf OR Myf (knm) T20 3T20 2T20-3R x T25 3T25 2T25-3R T32 3T32 2T32-3R T20 3T20 2T20-3R x T25 3T25 2T25-3R T32 3T32 2T32-3R For reinforcement arrangement refer to page 105 page 107

8 Table 25 Square Column: i. For single-tier, maximum length, for the shall be limited to 3m and 4m. ii. For double-tier, maximum length, for the shall be limited to 6m, 7m and 8m. 112 CS CS CS CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m N i (kn) M xi OR M yi (knm) N f (kn) M xf OR M yf (knm) T20 4T20 2T20 2T20 3R x T25 4T25 2T25 2T25 3R T32 4T32 2T32 2T32 3R T20 4T20 2T20 2T20 3R x T25 4T25 2T25 2T25 3R T32 4T32 2T32 2T32 3R

9 113 CS CS CS x () Axial oad Moment Axial oad Moment ar 1 ar 2 ar 3 ar 4 inks mm kn/m N i (kn) M xi OR M yi (knm) N f (kn) M xf OR M yf (knm) T20 4T20 2T20 2T20 3R x T25 4T25 2T25 2T25 3R T32 4T32 2T32 2T32 3R For reinforcement arrangement refer to page 105 page 107