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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
1/19www.engineeringcivil.com/presentation-on-reinforcing-detailing-of-r-c-c-members.html
Presentation on ReinforcingDetailing Of R.C.C Members
Posted in Civil Engineering Presentations, Concrete Engineering | Email This Post
Presented ByEr.T.RANGARAJAN, B.E, M.Sc(struct.engg), F.I.E, FACCE, LACI, LISSE,
LIASE
WHO IS AN ENGINEER? According to USA President Herbert Hoover, who was an engineer before he
became a politician, said:
The great liability of the engineer …compared to men of other professions……isthat his works are out in the open where all can see them.
His acts …..step by step …are in hard substances.He cannot bury his mistakes in the grave like the DOCTORS.
He cannot argue them into thin air…..or blame the judge…..like the LAWYERS.
He cannot, like the ARCHITECT, cover his figures with trees and vines.He cannot, like the politicians, screen his shortcomings by blaming his opponents….and hope the people will forget. The ENGINEER simply
cannot deny he did it.If his works do not work……he is damned.
Important Points from Presentation
A design engineer’s responsibility should include assuring the structural safety of the design, details, checking shop drawing.
Detailing is as important as design since proper detailing of engineering designs is an essential link in the planning and engineering process as
some of the most devasting collapses in history have been caused by defective connections or DETAILING. There are many examplesexplained in the book” DESIGN AND CONSTRUCTION FAILURES by Dov Kaminetzky.
Detailing is very important not only for the proper execution of the structures but for the safety of the structures.
Detailing is necessary not only for the steel structures but also for the RCC members as it is the translation of all the mathematicalexpression’s and equation’s results.
For the RCC members for most commonly used for buildings we can divide the detailing for Slabs-with or without openings.
(Rectangular,circular,non-rectangular-pyramid slab,triangular etc) balcony slab, loft slab, corner slab etc
Beams – With or without openigs.(Shallow & deep beams)Columns – (Rectangular,l-shape,t-shape, circular,octagonal,cross shape etc)Foundations.
Detailing for gravity loads is different from the lateral loads specially for the SEISMIC FORCES.
Apart from the detailing for the above there is a different detailing required for the Rehabilitation and strengthening of damaged structures.
We will now dwell on the DETAILING OF MEMBERS FOR THE GRAVITY AND SOME CODAL DETAILINGS AS PER IS CODEIS 13920 AND IS 4326 AS REQUIRED FOR SEISMIC FORCES.
DO’S & DONOT’S FOR DETAILING
DO’S-GENERALPrepare drawings properly & accurately if possible label each bar and show its shape for clarity.
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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Cross section of retaining wall which collapsed immediately after placing of soil backfill because ¼” rather than 1-1/4” dia. were used. Erroroccurred because Correct rebar dia was covered by a dimension line.
2. Prepare bar-bending schedule, if necessary.3. Indicate proper cover-clear cover, nominal cover or effective cover to reinforcement.4. Decide detailed location of opening/hole and supply adequate details for reinforcements around the openings.5. Use commonly available size of bars and spirals. For a single structural member the number of different sizes of bars shall be kept
minimum.6. The grade of the steel shall be clearly stated in the drawing.7. Deformed bars need not have hooks at their ends.8. Show enlarged details at corners, intersections of walls, beams and column joint and at similar situations.9. Congestion of bars should be avoided at points where members intersect and make certain that all rein. Can be properly placed.10. In the case of bundled bars, lapped splice of bundled bars shall be made by splicing one bar at a time; such individual splices within thebundle shall be staggered.
11. Make sure that hooked and bent up bars can be placed and have adequate concrete protection.
12. Indicate all expansion, construction and contraction joints on plans and provide details for such joints.13. The location of construction joints shall be at the point of minimum shear approximately at mid or near the mid points. It shall be formedvertically and not in a sloped manner.
DO’S – BEAMS & SLABS:1. Where splices are provided in bars, they shall be , as far as possible, away from the sections of maximum stresses and shall be staggered.2 Were the depth of beams exceeds 750mm in case of beams without torsion and 450mm with torsion provide face rein. as per IS456-2000.3. Deflection in slabs/beams may be reduced by providing compression reinforcement.4. Only closed stirrups shall be used for transverse rein. For members subjected to torsion and for members likely to be subjected to reversalof stresses as in Seismic forces.
5. To accommodate bottom bars, it is good practice to make secondary beams shallower than main beams, at least by 50mm.
17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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Do’s –COLUMNS.1. A reinforced column shall have at least six bars of longitudinal reinforcement for using in transverse helical reinforcement.-for CIRCULAR
sections.2. A min four bars one at each corner of the column in the case of rectangular sections.3. Keep outer dimensions of column constant, as far as possible , for reuse of forms.4. Preferably avoid use of 2 grades of vertical bars in the same element.
DONOT’S-GENERAL:
1. Reinforcement shall not extend across an expansion joint and the break between the sections shall be complete.2. Flexural reinforcement preferably shall not be terminated in a tension zone.3. Bars larger than 36mm dia. Shall not be bundled.4. Lap splices shall be not be used for bars larger than 36mm dia. Except where welded.5. Where dowels are provided, their diameter shall not exceed the diameter of the column bars by more than 3mm.6. Where bent up bars are provided, their contribution towards shear resistance shall not be more than 50% of the total shear to be resisted.
USE OF SINGEL BENT UP BARS(CRANKED) ARE NOT ALLOWED IN THE CASE OF EARTHQUAKE RESISTANCESTRUCTURES.
DETAILING OF SLABS WITHOUT ANY CUT OR OPENINGS.The building plan DX-3 shows the slabs in different levels for the purpose of eliminating the inflow of rainwater into the room from the openterrace and also the sunken slab for toilet in first floor.
The building plan DX-A3 is one in which the client asked the architect to provide opening all round.
Minimum and max.reinforcement % in beams, slabs and columns as per codal provisions should be followed.
SLABS:It is better to provide a max spacing of 200mm(8”) for main bars and 250mm(10”) in order to control the crack width and spacing.
A min. of 0.24% shall be used for the roof slabs since it is subjected to higher temperature. Variations than the floor slabs. This is required totake care of temp. differences.
17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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It is advisable to not to use 6mm bars as main bars as this size available in the local market is of inferior not only with respect to size but also
the quality since like TATA and SAIL are not producing this size of bar.
BEAMS:
A min. of 0.2% is to be provided for the compression bars in order to take care of the deflection.The stirrups shall be min.size of 8mm in the case of lateral load resistance .
The hooks shall be bent to 135 degree.
17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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DEVELOPMENT LENGTH OF BARS FOR A CONCRETE GRADE M20 &STEEL STRENGTH Fy=415
SLNO BARDIA.
TENSIONmmCOMPRESSION REMARKS
1 8 376.0 301.0
2 10 470.0 376.0
3 12 564.0 451.0
4 16 752.0 602.0
5 20 940.0 752.0
6 22 1034.0 827.0
7 25 1175.0 940.0
8 28 1316.0 1053.0
9 32 1504.0 1203.0
APPROXIMATELY USE 50Xdia FOR TENSION
References:1. Handbook On Concrete Reinforcement And Detailing-sp:34(s&t)-1987.
2. Manual Of Engineering & Placing Drawings For Reinforced Concrete Structures- (Aci 315-803. Manual Of Standard Practice –concrete Reinforcing Steel Institute.4. Tward Board Manual For Rural Water Supply Schemes.5. Design Principles And Detailing Of Concrete Structures. By D.S.Prakash Rao.6. Simplified Design-rc Buildings Of Moderate Size And Height-by Portland Cement Association,Usa.7. Design And Construction Failures By Dov Kaminetzky.8 IS:2502-1963 Code of practice for bending and fixing of bars for concrete reinforcement.
9. IS:1893:2000.10. IS:4326.11. IS:456:200012. Reinforced hand book by Reynold.
Download the Presentation on Reinforcing Detailing Of R.C.C Members
We are thankful to Er.T.Rangarajan for enlightening some of the detailing technique for the most commonly encountered RCCmembers in buildings. This presentation will surely help engineers to learn the reinforcement detailing of RCC members.
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Things Site Engineers Must Know About Reinforcement and Steel Bars
17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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What are the potential problems of excessive concrete covers?What is the purpose of setting minimum amount of longitudinal steel areasfor columns?What the preferable size of cover blocks?
How can heating assist in rebending of steel reinforcement?Where are the desirable locations of construction joints?Is mild steel or high yield steel suitable as lifting hoops in precast concrete?Load And Resistance Factor Design For Building Beams
Comments
Ajit Kantelia June 28, 2011 at 7:28 am
Res.Sir
Please let me know junction concreting of following circumstancis.1. when col.grade is M40 & beam & slab grade is M30.how will have to do concreting when col. & beam meet each other on each level of floor?Thank youRegards
ReplyK.Shenbagaperumal August 18, 2011 at 1:42 am
Dear sir,
What is the purpose in concrete design mix for (1.65 & standard deviation) please tell me i’m wait for ur reply.
ReplyK.Shenbagaperumal August 18, 2011 at 1:47 am
what is the soil test procedure & purpose in DRU DENSITY,DEGREE OF COMPACTION,PLASTIC LIMIT,LIQUITLIMIT,PLASTIC INDEX,GRADING ANALYSIS.
Replytareq October 3, 2011 at 2:32 am
Just I appreciate from this site.
ReplyLiakat November 9, 2011 at 10:10 am
Dear WebSite.Love your presentation.
ReplyMohd Sibghatullah Khan December 18, 2011 at 10:50 am
Dear SirI want to know how development length is calculated for different grade of concrete,& also for members in tension & compression?If you provide me the right answer i shall be highly obliged.Thanks & Regards.M S Khan
Replynagaraju January 16, 2012 at 12:41 am
very much useful for getting valuable information in respect of practical point of view.if it is incorporated with the practical problems arising in site then more learnings will benefited from this site
ReplySharif February 24, 2012 at 5:40 am
thanks for ur nice work. this is really help full for practical construction work
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17/03/2012 Presentation on Reinforcing Detailing Of R.C.C Members
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Reply
SADATCHARAMOURTHY March 2, 2012 at 6:12 am
very much useful information, thanks for ur nice work. this is really help full for practical construction work and for new structuralengineers
Replyanil March 4, 2012 at 12:17 pm
sir its all about a general building ?what about other buildings?
Replyashu March 13, 2012 at 4:03 pm
helped me alot for making presentation…..very useful information gained frm d site.thanxx..
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