STEEL REINFORCEMENT DETAILING

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RTA Structural Drafting Steel Reinforcement Detailing. and Detailing Manual,23 STEEL REINFORCEMENT DETAILING. 23 1 LAYOUT, The layout of a reinforcement drawing shall be in accordance with the principles outlined. in Section 22 of this Manual, Elevations Plans and Views of bridge components shall be treated as being transparent. with the applicable reinforcement details being added. The prefix Sectional shall not be used with any sub title. 23 2 BAR AND FABRIC DETAILING, The detailing of reinforcement shall be in accordance with the Authority s Manual Steel. Reinforcement Detailing Appendix A to this Section. Irrespective of bar shape the numbering of reinforcement whether bars or fabric shall be. in sequential order of bar placement and shall proceed from the bottom to the top of the. element under consideration wherever possible and or practical Bar marking shall be in. accordance with Clauses 2 and 3 of Appendix A to this section. eg 1 In a pier spread footing where the bar that is placed closest to the bottom. face and placed first shall be numbered P1 with the next bar being placed. being numbered P2 P3 etc, 2 In bridge decks where cross girders and or diaphragms are used the first.
bars placed will be in the cross girders or diaphragms as these bars must be. placed before the main slab reinforcement Numbering shall start at D1. The location of reinforcing bars in relation to each other particularly in connection details. such as column to headstock pile to pilecap and footing to column should be closely. examined to ensure that bars may be easily placed and that concrete compaction in that. area can be achieved, The location of cast in metal work i e dowels anchor bolts etc and the location of formed. holes shall also be checked to ensure interference is minimised Where the location of the. cast in item is critical reinforcement shall be detailed to suit the particular application. Where interference is of a minor nature only and is not critical e g the placing of shear. reinforcement a suitable note to be added to the drawing would be. the spacing of bars may be adjusted slightly where necessary. to clear formed holes and dowels, Australian Standard bar shapes as shown in Tables 3 1 A and 3 1 B of. AS 1100 Part 501 have been adopted for use along with bar shapes that are commonly. used by RTA Bridge Engineering See RTA Standard Bridge Drawing No RTAB031. Where the shape of a particular bar does not conform to the Standard bar shapes as. shown on RTA Standard Bridge Drawing No RTAB031 a Z suffix shall be added to the. bar shape code with the first non standard shape being AZ Variations within a particular. non standard bar shape ie same general shape with different leg lengths shall be identified. OTB005 Issue 1 Revision 2 05 March 2010 Page 1 of 3. RTA Structural Drafting Steel Reinforcement Detailing. and Detailing Manual, by the use of the next available numerical suffix within that particular bar shape eg AZ1. Any subsequent non standard bar shapes shall be numbered BZ CZ etc and all non. standard shapes shall be clearly defined in the BAR SHAPES DIAGRAM so that bending. to the correct size and shape can be achieved Where non standard bars require fitment. bends and hooks this and any other special features of any non standard bars shall be. specified in the Bar Shapes Diagram,23 3 DEVELOPMENT AND LAP LENGTHS. 23 3 1 General, This Clause provides information on development and lap lengths in common situations.
For information not covered by this Clause refer to AS 5100 5 Section 13. 23 3 2 Development lengths for a bar in tension, Formulae for calculation of development lengths of bars in tension are provided in. AS 5100 5 Clause 13 1, Tables 1 and 2 in Appendix A to this section contain deemed to comply development lengths for. Grade D500N bars to develop the full yield strength of the bar including the conditions for their use. Table 1 contains development lengths of bars in general position with the exception of bars in a. horizontal position with more than 300 mm of concrete cast below the bar Development lengths. for these bars are given in Table 2, As a general rule the centre to centre spacing of reinforcement in deck slabs is 150mm which leaves. an approximate clear spacing between the bars of 120mm and in most cases the splice lengths will. need to be calculated separately, 23 3 3 Development lengths for a bar in compression. Development lengths for Grade D500N bars in compression Lsy c are given in. Table 3 of Appendix A to this section, The development length of a bar in compression must be straight A bend or a standard hook are.
not considered effective in developing stress in reinforcement in compression. 23 3 4 Splicing of reinforcement,23 3 4 1 General, i Where lapped splices are used the lapped portions of bars shall be in contact. ii Bars in a splice shall provide minimum clear spacing of 1 5 times the diameter of the. bar 1 5 times the maximum nominal size of the aggregate or 40 mm between. adjacent parallel bars,23 3 4 2 Lapped splices for bars in tension. OTB005 Issue 1 Revision 2 05 March 2010 Page 2 of 3. RTA Structural Drafting Steel Reinforcement Detailing. and Detailing Manual, The lap splice length of bars in tension shall be not less than the development length Lsy t specified in. Clause 23 3 2 above, Tensile reinforcement shall not be spliced at points of maximum stress and not more than 50 of. the total area of tensile reinforcement shall be spliced in any section The following note shall be. placed in the General Notes on relevant sheets where reinforcement is detailed. Unless shown otherwise on the drawings laps on adjacent bars on any face shall be staggered. offset by no less than the lap length, Where bars are spliced at points of maximum stress and it is not possible to stagger the splices the.
lap length shall be not less than 1 3 Lsy t,23 3 4 3 Lapped splices for bars in compression. For formulae for the length of splices for bars in compression refer to AS 5100 5 Clause 13 2 5. Lap splice lengths for Grade D500N bars in compression shall for most applications be not less than. values given in Table 3 of Appendix A to this section. In cases where the ratio of cross sectional area of ties fitments or helixes to the main compression. reinforcement exceeds the limits specified in Clauses 13 2 5 b and c of. AS 5100 5 a reduced lap length of 0 8 times the value provided in Table 3 may be applicable. For identification of bars in compression the designer may need to be consulted. OTB005 Issue 1 Revision 2 05 March 2010 Page 3 of 3. RTA STRUCTURAL DRAFTING,AND DETAILING MANUAL,SECTION 23 STEEL REINFORCEMENT DETAILING. APPENDIX A,Issue 1 Revision 1 05 March 2010,CLAUSE No TOPIC PAGE No. 1 INTRODUCTION 1,2 DETAILING OF REINFORCEMENT 2,3 NOMENCLATURE 6. 4 LINE WEIGHTS 7,5 BASIC PRINCIPLES 5,6 SINGLE BARS OR SETS OF A SMALL NUMBER OF BARS 8.
7 NUMBER OF BARS IN A SET 12,8 COVER TO REINFORCEMENT 15. 9 LAPS IN REINFORCEMENT 16,10 DEVELOPMENT LENGTH OF REINFORCEMENT 19. 11 DETAILING REINFORCEMENT IN SECTIONS 20,12 LAYERS OF REINFORCEMENT 23. 13 SPACING OF BARS 27,14 REINFORCING FABRIC 29, 15 LAPPED SPLICES FOR REINFORCING MESH IN TENSION 30. 16 DETAILING LARGE AREAS OF REINFORCEMENT 30,17 CONCRETE DETAILING 31.
18 ARRANGEMENT OF REINFORCEMENT 31,19 SIZE AND GRADE OF REINFORCING BAR 33. 20 CLEAR SPACING AT LAPS 34,21 ACTUAL COVER TO LAPPED REINFORCEMENT 35. 22 DEVELOPMENT LENGTH FOR A BAR IN TENSION 36, 22 LAPPED SPLICE LENGTH FOR A BAR IN COMPRESSION 36. TABLE 1 DEVELOPMENT AND LAP LENGTHS FOR,BARS IN TENSION GENERAL BARS 37. TABLE 2 DEVELOPMENT AND LAP LENGTHS FOR,BARS IN TENSION TOP BARS 38.
TABLE 3 DEVELOPMENT AND LAP LENGTHS FOR,BARS IN COMPRESSION 38. TABLE 4 BAR MASSES 38,1 INTRODUCTION, Generally this document has been prepared to conform to the requirements. of AS NZS 1101 501 Structural Engineering Drawing and Austroads Guide. to Bridge Technology Part 5 Structural Drafting, Steel reinforcement should be generally detailed as set out in this. document and in accordance with the requirements of. AS 5100 Bridge Design, The layout of a reinforcement drawing should follow the procedure. set out in Section 22 of the RTA Structural Drafting and Detailing Manual. The elevations views and plans should be treated as transparent. and the reinforcement added,Sub titles shall be ELEVATION VIEW and PLAN.
The word Sectional shall not be used in any title or sub title. 2 DETAILING OF REINFORCEMENT, A typical example of describing a set of reinforcing bars is. A2 14 N16 S 300EF,Information for placing,Spacing of bars along limit line in millimetres. Bar shape code,Bar size in millimetres,Bar structural properties default grade is D500N. Number of bars in the set,Bar number in sequence,Structure element denotation. Note 1 The annotation mm is NOT used,2 There are NO full stops.
3 Where possible the standard bar shapes as shown on. RTA Standard Bridge Drawing No RTAB031 shall be used. Where a standard bar shape does not suit the application. a non standard bar shape shall be created in accordance. with Clause 23 2 of the RTA Structural Drafting Manual. and Detailing Manual, 4 A letter should prefix the bar sequence number to. aid in detailing bars in various elements of a bridge. For example A could refer to Abutment A B to,Abutment B P to piers and D to the deck steel. 5 Where a grade of steel other than D500N deformed bars grade. 500 steel normal ductility is required the size of bar should be. prefixed by a grade designation, D250N for Grade 250 deformed reinforcing bar normal ductility. R for plain round reinforcing bar Grade R250N,W for round reinforcing bar Grade 500L. Where a Grade 250 deformed reinforcing bar with normal ductility. is required it should be indicated as follows,A8 14 D250N12 S 300.
Other examples include, A8 14 R12 S 300 for plain round reinforcing bar Grade 250N. A8 14 W10 SP 300 for plain round reinforcing wire Grade 500L. 3 NOMENCLATURE, To facilitate use of the method of detailing given in this Manual. the nomenclature given in Figure 3a shall be used,5 D2 10 N12 S 300. D1 10 N12 S 300,1 Typical bar,2 Limit line,3 Limit bar of BAR or of a BUNDLE OF BARS. 4 Detail line, 5 Circle at junction of the typical bar and the limit line.
6 Starting dimension to limit bar Closing dimension is not given except. where non nominal cover is required Starting and closing. dimensions are necessary when using EQUAL SPACES and an. approximate dimension for the equal spaces shall be shown. 4 LINE WEIGHTS, To obtain uniformity in detailing of reinforcement on drawings. the line thicknesses shown in Figure 4a shall be used. CONCRETE OUTLINE,0 3mm or 0 5mm,TYPICAL SINGLE BAR. OR GROUP 0 7mm FOR,FOR 2 OR MORE BARS,IN A BUNDLE 0 5mm. LIMIT BAR CIRCLE 3mm,0 7mm DIAMETER,7mm PREFERRED,0 25mm 5mm. Use 4mm diameter D1 16 N12 L 300EF,circle at Scale 1 1.
for bundles of bars,5 BASIC PRINCIPLES, The basic principle of detailing reinforcement is that only ONE. TYPICAL BAR or TYPICAL GROUP of any SET of bars is drawn. For example the set of bars shown in Figure 5a would be detailed. as shown in Figure 5b,13 SPACES AT 300 60,DECK SLAB ASSUMED FIGURE 5a. D1 14 N12 S 300, Figures 5c and 5d show alternative methods for designating the. reinforcement In Figure 5c the bar marking is written on an extension. of the limit line in Figure 5d the bar marking is written directly on. the typical bar However these methods of detailing should only be. considered where overcrowding of the detail would not occur the. preferred method is that which is shown in Figure 5b. D1 13 N12 S 100EF,D3 12 N12 L 100 D2 12 N12 S 100EF. DECK SLAB ASSUMED,D1 13 12 S 100EF 50,D3 12 N12 L 100 100.
D2 12 N12 S 100EF,D3 13 N12 S 100 50,D2 12 N12 L 100 100. D1 12 N12 S 100EF,A5 5 N12 S 100EF,A4 12 N12 L 100 100. A1 5 N12 S 100EF A2 7 N12 S 100EF,A3 8 N12 S 100EF DENOTES VARIABLE LENGTH BAR. 6 SINGLE BARS OR SETS OF A SMALL NUMBER OF BARS, Where single bars occur they shall detailed as shown in Figure 6a. A1 1 N12 V, Where a set of a small number of bars occur and space is limited.
they may be detailed using the most suitable alternative method. as shown in Figure 6b,A1 2 N16 L 200 OR OR,A1 2 N16 L 200 A1 2 N16 L 200. May be used when bars are,too close to enclose, NOTE It may be necessary in some instances to detail all the bars. for various reasons eg,a to ensure that they can be fitted in OR. b bars are at an irregular spacing,Figure 6c shows an example. A25 1 N12 LL,A25 1 N12 LL,A24 4 N12 T,DETAIL A Number of bars.
23 STEEL REINFORCEMENT DETAILING 23 1 LAYOUT The layout of a reinforcement drawing shall be in accordance with the principles outlined in Section 22 of this Manual Elevations Plans and Views of bridge components shall be treated as being transparent with the applicable reinforcement details being added

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