(Clause 12) · NBC 2016 (SP 7:2016) Volume 1

Notations, Symbols and Abbreviations

J-1 The following notations, letter symbols and abbreviations shall have the meaning indicated against each, unless otherwise specified in the text of this Section of the Code:		$k_p$ = Shape modification factor
		$k_s$ = Stress reduction factor
		L = Actual length of wall
		L1, L2 = Lower strength mortars
A = Area of a section		M1, M2 = Medium strength mortars
b = Width of bearing		P = Total horizontal load
DPC = Damp proof course		PL = Plinth level
e = Resultant eccentricity		RCC = Reinforced cement concrete
$f_b$ = Basic compressive stress		RS = Rolled steel
$f_c$ = Permissible compressive stress		$S_p$ = Spacing of piers/buttresses/cross walls
$f_d$ = Compressive stress due to dead loads		SR = Slenderness ratio
$f_s$ = Permissible shear stress		t = Actual thickness
$f_m$ = Compressive strength of masonry (in prism test)		$t_p$ = Thickness of pier
		$t_w$ = Thickness of wall
GL = Ground level		W = Resultant load
H = Actual height between lateral supports		$W_1$ = Axial load
$H'$ = Height of opening		$W_2$ = Eccentric load
H1, H2 = High strength mortars		$w_p$ = Width of piers/buttresses/cross walls
h = Effective height between lateral supports		μ = Ratio of flexural strength of wall in the vertical direction to that in the horizontal direction
$k_a$ = Area factor

The following list records those standards which are acceptable as ‘good practice’ and ‘accepted standards’ in the fulfillment of the requirements of the Code. The latest version of a standard shall be adopted at the time of enforcement of the Code. The standards listed may be used by the Authority for conformance with the requirements of the referred clauses in the Code.

IS No.	Title
(1) 1077 : 1992	Specification for common burnt clay building bricks (fifth revision)
1725 : 2013	Stabilized soil blocks used in general building construction — Specification (second revision)
2180 : 1988	Specification for heavy duty burnt clay building bricks (third revision)

In the following list, the number appearing in the first column within parentheses indicates the number of the reference in this Part/Section.

IS No.	Title
2185	Specification for concrete masonry units
(Part 1) : 2005	Hollow and solid concrete blocks (third revision)
(Part 2) : 1983	Hollow and solid light weight concrete blocks (first revision)
(Part 3) : 1984	Autoclaved cellular aerated concrete blocks (first revision)
(Part 4) : 2008	Preformed foam cellular concrete blocks
2222 : 1991	Specification for burnt clay perforated building bricks (third revision)
2849 : 1983	Specification for non-load bearing gypsum partition blocks (solid and hollow types) (first revision)
3115 : 1992	Specification for lime based blocks (second revision)
3316 : 1974	Specification for structural granite (first revision)

PART 6 STRUCTURAL DESIGN — SECTION 4 MASONRY

IS No.	Title	IS No.	Title
3620 : 1979	Specification for laterite stone block for masonry (first revision)	(9) 1893 (Part 1): 2016	Criteria for earthquake resistant design of structures: Part 1 General provisions and buildings (sixth revision)
3952 : 2013	Burnt clay hollow bricks and blocks for walls and partitions — Specification (third revision)	(10) 456 : 2000	Code of practice for plain and reinforced concrete (fourth revision)
4139 : 1989	Specification for calcium silicate bricks (second revision)
12440 : 1988	Specification for precast concrete stone masonry blocks	(11) 13920 : 2016	Code of practice for ductile detailing of reinforced concrete structures subjected to seismic forces (first revision)
12894 : 2002	Specification for pulverized fuel ash lime bricks (first revision)
13757 : 1993	Specification for burnt clay fly ash building bricks	(12) 1077 : 1992	Specification for common burnt clay building bricks (fifth revision)
(2) 4082 : 1996	Recommendations on stacking and storage of construction materials and components at site (second revision)	(13) 2185 (Part 1): 2005	Concrete masonry units — Specification: Part 1 Hollow and solid concrete blocks (third revision)
(3) 2250 : 1981	Code of practice for preparation and use of masonry mortars (first revision)	(14) 1597 (Part 2): 1992	Code of practice for construction of stone masonry: Part 2 Ashlar masonry (first revision)
(4) 2110 : 1980	Code of practice for in-situ construction of walls, in building with soil-cement (first revision)	(15) 2751 : 1979	Code of practice for welding of mild steel plain and deformed bars for reinforced concrete construction (first revision)
2212 : 1991	Code of practice for brickwork (first revision)
1597	Code of practice for construction of stone masonry	(16) 9417 : 1989	Welding — Cold-worked steel bars for reinforced concrete construction — Recommendations for welding (first revision)
(Part 1): 1992	Rubble stone masonry (first revision)
(Part 2): 1992	Ashlar masonry (first revision)	(17) 883 : 2016	Code of practice for design of structural timber in building (fifth revision)

PART 6 STRUCTURAL DESIGN — SECTION 4 MASONRY

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PART 6 STRUCTURAL DESIGN

Section 5 Concrete: 5A Plain and Reinforced Concrete

BUREAU OF INDIAN STANDARDS

FOREWORD ... 5
SECTION 5A (A) GENERAL
1 SCOPE ... 7
2 TERMINOLOGY ... 7
3 SYMBOLS ... 7
SECTION 5A (B1) MATERIALS, WORKMANSHIP, INSPECTION AND TESTING
4 MATERIALS ... 8
5 CONCRETE ... 11
6 WORKABILITY OF CONCRETE ... 12
7 DURABILITY OF CONCRETE ... 13
8 CONCRETE MIX PROPORTIONING ... 17
9 PRODUCTION OF CONCRETE ... 19
10 FORMWORK ... 21
11 ASSEMBLY OF REINFORCEMENT ... 22
12 TRANSPORTING, PLACING, COMPACTION AND CURING ... 22
13 CONCRETING UNDER SPECIAL CONDITIONS ... 24
14 SAMPLING AND STRENGTH OF DESIGNED CONCRETE MIX ... 25
15 ACCEPTANCE CRITERIA ... 26
16 INSPECTION AND TESTING OF STRUCTURES ... 26
SECTION 5A (B2) SPECIAL CONCRETE
16A SELF COMPACTING CONCRETE ... 27
16B HIGH PERFORMANCE CONCRETE ... 30
SECTION 5A (C) GENERAL DESIGN CONSIDERATION
17 BASES FOR DESIGN ... 32
18 LOADS AND FORCES ... 32
19 STABILITY OF THE STRUCTURE ... 33
20 FIRE RESISTANCE ... 33
21 ANALYSIS ... 34
22 BEAMS ... 37
23 SOLID SLABS ... 39
24 COMPRESSION MEMBERS ... 41
25 REQUIREMENTS GOVERNING REINFORCEMENT AND DETAILING ... 41
26 EXPANSION JOINTS ... 49
SECTION 5A (D) SPECIAL DESIGN REQUIREMENTS FOR STRUCTURAL MEMBERS AND SYSTEMS
27 CONCRETE CORBELS ... 49
28 DEEP BEAMS ... 50
29 RIBBED, HOLLOW BLOCK OR VOIDED SLAB ... 51
30 FLAT SLABS ... 52
31 WALLS ... 60
32 STAIRS ... 62
33 FOOTINGS ... 62
SECTION 5A (E) STRUCTURAL DESIGN (LIMIT STATE METHOD)
34 SAFETY AND SERVICEABILITY REQUIREMENTS ... 65
35 CHARACTERISTIC AND DESIGN VALUES AND PARTIAL SAFETY FACTORS ... 65
36 ANALYSIS ... 66
37 LIMIT STATE OF COLLAPSE: FLEXURE ... 67

PART 6 STRUCTURAL DESIGN — SECTION 5 CONCRETE: 5A PLAIN AND REINFORCED CONCRETE

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National Building Code Sectional Committee, CED 46

This Code (Part 6/Subsection 5A) covers the structural design aspects of plain and reinforced concrete.

The Section 5 of Part 6 of the Code covers plain and reinforced concrete and also the prestressed concrete. The Section has been subdivided into the following subsections:

5A Plain and Reinforced Concrete