Sp34 STRUCTURAL DRAWING FOR DETAILING

Sp34 STRUCTURAL DRAWING FOR DETAILING

1. STRUCTURAL DRAWING FOR DETAILING SECTION-3,SP 34 Prepared by Ankammarao

2. The structural drawing for a large project should generally be of one size. Size of Drawing

3. The title block is an important feature is an drawing and should be placed at the bottom right-hand corner of the sheet, where it is readily seen when the prints are folded in the prescribed manner. The size of the title block recommended is 185 X 65 mm. Separate sheets should be used for each type of structural member or unit so that a floor slab would be detailed on one sheet, beams on another, and columns on a further sheet, etc

4. Scales shall be so chosen as to bring out the details clearly and to keep the drawings within workable size. The choice of scale will depend at the discretion of the detailer/designer. Some commonly used scales PLAN – 1:100, 1:50 ELEVATION - 1:5, 1:30 SECTION - 1:50, 1:30, 1:25, 1:20, 1:15, 1:10 Scale of Drawing

5. The overall sizes of the concrete members shall include the sizes of any necessary chamfers and fillets at corners. Also, the exact position, shape, size and spacing of there in reinforcement within concrete members, as well at the required dimensions of the concrete cover to the reinforcement. The beams, wall slabs, floor slabs and columns, etc, the main dimensions of the structure, such as the distances between columns, heights between floors, beam and column sizes, and floor and wall thicknesses, etc , as calculated by the design engineer shall also be shown on the drawings. Structural drawings prepared by the designer shall show details of reinforcement and all other information needed for detailing the reinforcement, and. grade of steel, number of bars to be lapped and lengths of the laps Information to be Shown on Structural Drawings

6. To ensure that all the reinforcement is properly placed or positioned in a unit , longitudinal section or cross-section should be shown in addition to plan and elevation of the unit on which the bars are shown. All bars, straight or bent requiring hooks bends shall be properly designated by the designer or a note to this effect included in the drawing. Lengths of lap, points of bend, cut-off bars should be specified by the designer. The dimensions L/7, L/ 5 and L/4, etc. Wherever possible all control and construction joints should he indicated on structural drawings and constructional details provided for such joints.

7. Symbols Relating to Cross-Sectional Shape and Size of Reinforcement ∅ plain round bar or diameter of plain round bar. □ Plain square bar or side of plain square bar and # deformed bar (including square twisted bar) or nominal size (equivalent diameter or side) of the deformed bar. Symbols Relating 10 Shape of the Bar along its Length Alt- Alternate bar Bt- Bent bar B- Bottom bar Min- Minimum Max- Maximum St- Straight bar Stp- Stirrup SP –Spiral Ct- Column tie T -Top bar Symbols and Abbreviations

8. Symbols Relating to Various Structural Members Bm or B- Beams CoI- Column(s) Fg- Footing(s) GR- Girders JT- Joints(s) LL- Lintel(s) LB- Lintel beam(s) Sb or S- Slab(s) WL- Longitudinal wall Wx- Cross wall E Centre line Examples: 20-# I2 means- 20 numbers of I2 mm diameter deformed bars. # 20@ 200 means -20 mm diameter detormed bars spaced at 200 mm centre to centre. ∅32-St-12 means -12 numbers of 32 mm diameter plain round straight bars in each direction.

9. Symbol Designation/Description Concrete line (thin) Unexposed concrete or masonry wall line (thin) Reinforcement (thick) Centre line Concrete beam framing into column which extends through floor Bar with hooks Bar with 90° bends Level mark in elevation Level mark in plan