Guidelines for Detailing of Reinforcement in Concrete Structures

2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

Typical seismic-resistant details: boundary members. 4

AC1 DETAILING MANUAL-2004
Details and Detailing of Concrete
Reinforcement (AC1 3 15-99)

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CHAPTER THREE

REINFORCED CONCRETE BEAM AND SLAB BY EC2 AND ACI
CODES

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A] RC BEAM

 Rules for spacing and quantity of reinforcement EC2
Minimum Reinforcement Area Flexural cracking is generally controlled by providing a
minimum area of tension reinforcement and limiting bar spacing or limiting bar sizes.
(a) Minimum reinforcement area.

Control of Cracking without Direct Calculation
1. Maximum spacing of reinforcement

Cracking due to loading is minimized by ensuring that the maximum spacing between
longitudinal reinforcing bars in beam is limited to that given in Table 7.2N.

(b) Maximum bar size.

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SIMPLIFIED CURTAILMENT RULES FOR BEAM

Figure 1: Simplified detailing rules for beams
1. CANTILEVERED BEAMS

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BEAMS. ARRANGEMENT OF REINFORCEMENT AT CROSS-SECTION

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BEAMS CONTRACTION JOINTS

TYPE 1 Points with a nil (or very small) bending moment Manual for Detailing Reinforced Concrete Structures to EC2
POSITION: 45° By Jose Calavera
SLANT= For b≤ 30 cm, the natural slope is = 45°.
EXECUTION: For b > 30 cm, form with galvanized welded
wire with mesh size under 20 mm or galvanized
TYPE 2 metal lath, at a 45° angle
POSITION: FINISH: Natural roughness
SLANT:
EXECUTION: Points with nil (or very small) shear
Vertical
Form with galvanized welded wire with mesh size
under 20 mm or galvanized metal lath

1

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BEAMS WITH ARCHITECTURAL CONCRETE ,CONTRACTION JOINTS AND
CONSTRUCTION JOINTS

RECOMMENDATIONS [ EC2]

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2. Two joints may be set close to one another while concrete pouring continues. The area
left open would subsequently be filled in as per the preceding recommendation. A second
option is simply to interrupt concrete pouring during the times specified. (This applies to
contraction joints.)
3. Note the specifications for architectural concrete to prevent rough edges from forming.

STRUCTURAL DETAILS Manual for Detailing Reinforced Concrete Structures to EC2
1-SIMPLY SUPPORTED BEAMS [EC2] By Jose Calavera

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Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

2- HEADER JOISTED BEAM

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Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

3.CONTINOUS BEAM

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Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

1

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4. CONTINUOUS LINTELS WITH VARIABLE DEPTH

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

1

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Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

5.STAGGERED LINTELS

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STEPPED LINTELS DETAILS Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

2. EDGE SOFFIT BEAM

European Code Practice EC2 2

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Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

European Code Practice EC2 2

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9. INTERNAL SOFFIT BEAM

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

1

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10. SOFFIT BEAM-EDGE BEAM INTERSECTION (1 of 2)

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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European Code Practice EC2 2

11.SOFFIT BEAM-EDGE BEAM INTERSECTION (2 of 2)

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

3. TRANSITION FROM INTERNAL SOFFIT BEAMS TO NORMAL BEAMS

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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4. TRANSITION FROM EDGE SOFFIT BEAMS TO NORMAL BEAMS

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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European Code Practice EC2 2

14.BEAM TO COLUMN JOINT DETAILS

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15. ANOTHER STRUCTURAL DETAILING European Code Practice EC2 2

Information of this detailing according EC2.

Design information for detailing should include:
• Layout and section drawings including details of nibs and upstands, etc.
• Concrete grade and aggregate size (standard 30/37MPa and 20mm).
• Nominal cover to reinforcement (standard 35 or 40mm), and the criteria governing this

(fire resistance or durability). Where nominal cover is more than 40mm further information

is required for fire resistance.
• Details of the main reinforcement and links including:
– bar size and number or pitch
– type of reinforcement and bond characteristics (standard H)
– curtailment of bars if other than standard lap length or other than normal tension lap.
• Details of any special moment bar connecting beam to edge columns with sketches at

large scale.
• Details of insertion and openings, e.g. conduit, cable ducting, etc., should be given where

the placing of reinforcement is affected.

A] Individual beams.

This method is normally used where the job has little repetition and it is simpler to show
the details of all beams individually.

Standard Method of Detailing Structural Concrete 3
A manual for best practice

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The details relate to a general beam elevation and specific cross sections.
Bar location letters are used to cross-reference the reinforcement on the elevations and the
table. Fixing dimension of bars are labelled and cross-referenced from the elevations to the
table. The position of each beam is shown on a key plan which also shows the relevant grid
lines.

Standard Method of Detailing Structural Concrete 3
A manual for best practice

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B] Broad beams.

Standard Method of Detailing Structural Concrete 3
A manual for best practice

C]Span and support details

Nominal cover to all reinforcement specified by designer (Normally: Internal 35, External

40)

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D] Broad shallow sections Standard Method of Detailing Structural Concrete 3
A manual for best practice

The longitudinal space taken by each set of links shown is 3 x bar size. This should be
checked to ensure congestion does not occur

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At external supports the anchorage of longitudinal bars should be treated as for slabs

Standard Method of Detailing Structural Concrete 3
A manual for best practice
E] Cantilever beams.

Standard Method of Detailing Structural Concrete 3
A manual for best practice

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 At least 50% of cantilever bars should be anchored a distance of 1.5 x cantilever. No
reinforcement should be stopped less than 0.75 x cantilever unless specified by
designer.

 At least 50% of maximum area continues to end of cantilever unless specified
otherwise by designer

STRUCTURAL DETAILS OF BEAM – ACI CODE

Beam widths—To permit satisfactory placing of concrete and to furnish adequate concrete
protection, the A/E must provide for adequate clear distance between parallel bars and
between bars and forms. The A/E must specify the required concrete protection for the
reinforcing steel. The A/E must also specify the distance between bars for development
and concrete placing. For buildings, the clear space is the larger of one bar diameter, 1-1/3
the maximum size of coarse aggregate to be used, and 1 in. (25 mm). For cast-in-place
bridges, required clear space is the larger of 1.5 bar diameters, 1.5 maximum size
aggregate, and 1.5 in. (40 mm).

5. SIMPLY SUPPORTED BEAM [ACI]

AC1 DETAILING MANUAL-2004 4
Details and Detailing of Concrete
Reinforcement (AC1 3 15-99)

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6. END SPAN , SIMPLY SUPPORTED BEAM [SINGLE]

7. INTERIOR – CONTINOUS BEAM

AC1 DETAILING MANUAL-2004 4
Details and Detailing of Concrete
RECOMMENDATIONS Reinforcement (AC1 3 15-99)

Note: Unless noted otherwise, tables and figures are based on ACI 318 (318M). Concrete
cover shown is minimum and should be increased for more severe conditions. Except for
single span slabs where top steel is unlikely to receive construction traffic, top bars lighter
than No. 4 at 12 in. (No. 13 at 300 mm) are not recommended. For a discussion of bar
support spacing, see Section 5.4 of this standard. See also Chapter 12 of ACI 318 (318M).
Bar cutoff details must be verified to provide required development of reinforcement.

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8. NON-PARIMETER BEAM WITH OPEN STIRRUPS

9. NON-PARIMETER BEAM WITH CLOSED STIRRUPS AC1 DETAILING MANUAL-2004 4
10. PARIMETER BEAM Details and Detailing of Concrete Reinforcement (AC1 3 15-99)

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RECOMMENDATIONS
Check available depth, top and bottom, for required cover on ACI standard hooks. At each
end support, add top bar 0.25L in length to equal area of bars required. See also Chapter 12
and Chapter 21 of ACI 318 (318M). Bar cutoff details must be verified to provide required
development of reinforcement.

11. SINGLE SPAN JOIST CONSTRUCTION

12. INTERIOR SPAN JOIST CONSTRUCTION AC1 DETAILING MANUAL-2004 4
13. END SPAN JOIST CONSTRUCTION Details and Detailing of Concrete
Reinforcement (AC1 3 15-99)

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Note: See also Chapter 12 and Section 7.13 of ACI 318 (318M). Bar cutoff details must be
verified to provide required development of reinforcement.

Typical seismic-resistant details: flexural members. .14

AC1 DETAILING MANUAL-2004 4
Details and Detailing of Concrete
Reinforcement (AC1 3 15-99)

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B] RC SLAB - EC2 CODE
1. GENERAL TYPES: LONGITUDINAL AND CROSS-SECTIONS

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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2
European Code Practice EC2

2. SOLID SLAB- CONNECTION TO BRICK WALLAND CONCRETE BEAMS

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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European Code Practice EC2 2

3.RIBBED SLAB- CONNECTION TO BRICK WALL AND CONCRETE BEAMS

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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4.SLABS WITH SELF-SUPPORTING REINFORCED CONCRETE JOISTS. 1
CONNECTIONS TO BRICK WALL

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

European Code Practice EC2 2

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

5. SLABS WITH SELF-SUPPORTING REINFORCED CONCRETE JOISTS.
CONNECTIONS TO REINFORCED CONCRETE BEAMS

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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6. SLABS WITH SELF-SUPPORTING REINFORCED CONCRETE JOISTS.
CONNECTIONS TO SOFFIT BEAMS

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

7. SLABS WITH SELF-SUPPORTING PRESTRESSED CONCRETE JOISTS. 1
CONNECTIONS TO BRICK WALL

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

European Code Practice EC2 2

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

8.SLABS WITH SELF-SUPPORTING PRESTRESSED CONCRETE JOISTS.
CONNECTIONS TO REINFORCED CONCRETE BEAMS

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

9. SLABS WITH SELF-SUPPORTING PRESTRESSED CONCRETE JOISTS.
CONNECTIONS TO SOFFIT BEAMS

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

10. SLABS WITH SEMI-SELF-SUPPORTING REINFORCED CONCRETE JOISTS.
CONNECTIONS TO BRICK WALL

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

11. SLABS WITH SEMI-SELF-SUPPORTING REINFORCED CONCRETE JOISTS.
CONNECTIONS TO CONCRETE BEAMS

Manual for Detailing Reinforced Concrete Structures to EC2 1
By Jose Calavera

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2015 Guidelines for Detailing of Reinforcement in Concrete Structures EC2 & ACI

12. SLABS WITH SEMI-SELF-SUPPORTING REINFORCED CONCRETE JOISTS.
CONNECTIONS TO SOFFIT BEAMS

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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13.SLABS WITH SEMI-SELF-SUPPORTING REINFORCED CONCRETE LATTICE JOISTS.
CONNECTIONS TO BRICK WALL

1

Manual for Detailing Reinforced Concrete Structures to EC2
By Jose Calavera

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