3370 2

1. 18 13970 (Part 11) 1965

Indian Standard ‘Festtrmeass99)

CODE OF PRACTICE FOR
CONCRETE STRUCTURES FOR THE
STORAGE OF LIQUIDS
PART Il REINFORCED CONCRETE STRUCTURES.

Ten Reprint FEBRUARY 1992

LD 621.642:666.982

© Coprs 1916

BUREAU OF INDIAN STANDARDS

August 1976

2. 18 23970 (Part It) 1965

Indian Standard

CODE OF PRACTICE FOR
CONCRETE STRUCTURES FOR THE
STORAGE OF LIQUIDS
PART Il REINFORCED CONCRETE STRUCTURES

tional Committe, BC.

Neate) gt id, Bey

BUREAU OF INDIAN STANDARD
MANAK BHAVAN, 9 BAHADUR SHAM ZAFAR MARO

3. 183970 € Pace) 298$

rte Subcommites, BDO 2+2
Suns, 5.0, Jot & Cad, ander

nd pt

4. 1513370 (Pare HE) 1965
Indian Standard

CODE OF PRACTICE FOR
CONCRETE STRUCTURES FOR THE
STORAGE OF LIQUIDS
PART It REINFORCED CONCRETE STRUCTURES

0. FOREWORD

01 This Indian Standard (Port IE) was adopted by the Indian 5

aras Tnntation on 19 November 196, afer the draft alized by the

Great and Concrete Sectional Committee bad been approved bY the
1 Engineering Divison Council

02 The need for
forced concrete and pretrened, Concrete tx
usés ue been long! thi fo far, auch ruca

been designed to saying standards adapted Pom the recommendations
Sie Fst i Sed of the Portland Coment Amo”

rage of lg
Standard code of pa e orage of liquida (182 3970
ken This hart {18 3370 (art TL -1068] deals with renforced
Three other pats of the code are the flog
Part D Prestraed concrete structures
AV Design tables
3 Alıhough the provisions of this code cover mainly structures for the
forage of liquid he general provi ode may alo be applied,
Sith such modifications as ary to uit the Epia cond
Concrete and pretrewed conecte structure for
the conveynoce of liquida uch se aqueduct and saperpesoges
04 While we methods of design and e mn have been
‘Covered in this codo, dep of strictures of special forme or in unusual

s

5. 1543970 Puce T1)-1965,

eireumnance should be ff tothe judgement of the engineer and in auch
‘aver speci systems of design and comiracalon may be permitted on
(production of atatactory ce regarding ther adequacy and lay
By analy or test or by ba

05 In his standard it has ben amumed thatthe design of liquid einig,
Structures whather of plan, led or prenrened concrde, I enrune
dio a qualed engineer and thatthe exeeution of the work de cari
‘Sa undl the dico of an experienced supervisor.

All eguicement of 1S : 496-1964" and 18: 1545-1060, in so ft a
‘hey spe hal be deemed to fren part of this cade except whereother>
ws iti down in this code,

07 The Sectional Commitee reponsible for the preparation of this
andará hae taken ito sovaideraton the views of engineers and tech
Doha and has related the standard to the practices followed in the
Sram i this Rd. Due weightage hat ale been given tothe need lor
{ternational coordination among the standards prevailing in different
ountrcs ofthe word These codsidcrations ed the Setionsl Comniiee
do derive anta from able materials ofthe following organiza

British Standards Instntion,

Tnaitation of Civil Engineer, London, and

Portland Cement Anociation, Chicago, USA,

0.8 For the purpose of deciding whether a particular requirement of this
Standard is"camplicd with ie Gual value, herve e calculated,

pressing the feat of a teat or analyst, shall be rounded cffin accordance
Sith 1503-19608. “The umber of signifesnt places reiined in the
‘Founded off val shouldbe the sume ag that of the specifed vale inthis

1. SCOPE

11 This ap down he requirements spice pe
ThE dawn ni SHOT Fae to

“Eee po pan nd ind nat om

Pee A

6. 181 3970( Pace HE) = 1965

12 This code does not cover the requirements for reinforced and pre
Send concrete sictore for storage of hot liquide and liquida of owt
‘cont and high penetrating power Ike peto, Ue Speciat
roblens of ahridkage arng In the rage” of somaquenas liquid
Ed the mener eee where chemie attack de posible, are
al ot dai wih, "te sCcommendäien however, may every de
Aplicable to she storage at norma! temperature ol aquecas liquido and
nena which have 16 etsiental action on eonerete and tel or where.
ficient preeqiions are taken vo ensure protection of conerete and ses)
From danige due to ation of such Huch a im the eue of sewage

2. GENERAL REQUIREMENTS

2.1 Design and construction of reinforced coreret liquid retaining
tet shall compl withthe requirements of 1813970 (Pare )198

3. DESIGN

3.1 General — Provisions shall be made for conditions of stress that
fay oscar in accordance wih principles of mechande, ecoghized methods
PASES and sound engineering practice, In particular adequate conside
ration shail be given to the eects of monolithic cnsteuction in the
ne of bending moment and seat

3111 Before taking up the detailed deign, the designer should

mat onthe ers eat of Ios tad on

‘ning of overhanging range
rat should be auch that al equilibrium should Be sated ea,

When the overtueting moment is doubled.

3122 Design of members other than those excluded by 3.21 shall be
bose on covtideration of adequate revitance to cracking as well as ae
Gate rengih. Calculation cf sreser shall be bared da the Sllewing

7. 570 Pare IL)» 1965

sion of both) relating. renta 1 ‘the comes de
se inehning the cover, together wich the seinforeement
terre de referee

where

Q = toasts

An lever erm

In strength eaculations the conecte has no tensile strength

‘iruciues may be deigned against wrustoal

in pin coneete as pet the permble ants
fake care of falare tte ho cracking. However, nominal tialorcement in
Becordance with the requirements of 18 490-1004" sal

3:54 Fr Resiste to Cracking —Foreatnlations othe resistance
‘uc to bending ) and shear shall conform to the values specified in Table
1. Te peral cale ares duc to bending apply othe face ofthe

member e contact wih the liquid. In members lee than 225 mex tek
And in contact withthe quie on one ide, these permisible seme in
Eoncing apply also tothe fae reine om the qu

3.32 Far SirmgthCalatains — In strength calculations, the pe
concrete arca thal De in accordance with 8 of 18 = 436-1964". W
the calculated shear strc la concrete lane exceda the permisible val
feinforcement acting in conjunción wich diagonal compresion i
Comares shall bs provided to take the whole af the shear

8. 15: 3970 (Pare It) = 1965

34 Permirsible Strenres in Steel

A For Reitan de Cracking — When soe and concreto are
to at topes for checking ehe sense ms in concret fr seid
fe temic ren the eel wil be mit by she requiremen
‚nei inthe concrete mob exerce tthe
nl be equal to de product ef o a

3.42 For Strength Calton — Pos strength caeulations the permisible
res in see enforcement shall be as given in Tale à

35 Stresses Due to Drying Sbrinkage or Temperature Change

3) the perminihie tree pre in 3.8 and 34 are not otherwise
ducing the contraction period and until the reserve is put Int.
the recommendations of this code [ae 18: 3370 (Part 1)-1968e]

garda the provision of joints and for aiable siding layer

ih the reservoir are complied with or the secc eta be

“only forthe orage of water or aqueous quid at or Rea
emperatve Sind the eircamtancee are such that the
wil never dy out

9. 1843970 (Pare 11) - 1965

51 Shrinkage senses may, however, be required to be enlenlsed
in apecial eme when shriakage cocfeient Bf 300 % 10% may be

10. 18 3570 Part m) -1965

252 When the shrinkage ares ae allowed, the permissible srenen,
tense arenes in concrete dirt and bending] as given in Table À may
Fe inerssed by 35] percent

35.3 Were revoir ave protected with an internal impermeable
lining, consideration should be given t the poilu of concrete eve
Mal drying outs" Unies: i tablished onthe’ hase of wat or
‘perience that the lining bar “adequate crack bridking properties,
mans forthe increas eet of dying hrinhage should ade i
the design

LL Provisions of Movement Jointe — Movement jinthallbe pr
Sided in accordance wit Bof ES 4990 (Bart 17-1005
42 Floors of Tans Resting on Ground — If the tank is ring
percentage of reinforcement { smaller i hi mira pe dá dam
Appreciable subsidence in any par and thatthe conesete Moor a Cast in
puncl with sides rot more than #3 metes with contraction or expansion
Sinne between: In such cas à seed or concrete layer not lee than
8 mm thick shall ct be placed on the ground ad covered witha ii

layer of bitumen paper de other suitable material 10 detroy the bond
Pen the srced nnd four comerte

In normal circ reed ayer shal be of grade not w
than BF 100 3p ren
er are capte, the gered tae M
10 cite in 18: 66-1964 and if mecenas] sulphate encia or
Be special een; should be ued

43 Floors of Tasks Resting on Supports — Ifthe tank s supported
on wal or aiher sma suppres the Bros tsb shal be designed sr
ds Gatling for bending ment dus ts ter fad and wl eign The
wort condeions cf losdings may not be Ihos given In 93 of 18456
156, since water level extends over all spans In normal conduct
exce inthe eae of muldrec tank hee will have fo De determined by
ibe Gesigwer in cach parco ene

‘43.1 When the oor i igidly connected tothe walls (as 6 generally
he caso) the bending moments st the junction betwech the wall and
for shal be taken into a ign of floor gether with any
‘iret free raser 0 be oor am che walls or fom the Roos othe
wall due tothe nupenion ofthe lor from the wall

11. 1813970 (Part 11) 1965

432 In confins Tram or Lebeams with ba on the side remot
‘he tenio meonerete nthe quid sds atthe fn
ot cacaed the perms role rc

Te wth of the dh gen in ehe sah
tna fr calculan of heroes 40 €

floor sat may bequzaby tied o Barato enforcement
mn bathe aläb an she wales in such casco
a Ceurvedor eg Ÿ decorar under the wall provided

34 Samciines i may he esonomial to prove the Noor of rear

WALLS

Provision of Joints
SAL diz Jus eth Bat of

51. Considerations af pacing of vera n
joint se died in 8 oF 1843370 ( Part 13-1008. Wise u
Sulicient jeins of ie ex pe should be ov

52 Pressure on Walls
52.1 liquid ein trueares with Bed or Rating.
een tall be added to

12. 18 + 3979 (Pare IL) = 1965

rh em ban aguas the effet a car pre

“lacus In AUF 1523870 ( Fa

ia. The dir bora ten
crt can

Fine, Doria Sunforcoment and haunch ba

ida re he horizontal en

are designed to withstand the wil

concider without lateral supports,

Tn the case of rectangular or polygonal ta

as two way la whereby the all continua or

the horkantaleieeion, und or Minze at the Botton aod hinged

fee atthe top. The walle thus act as thin ples

Fringe loading and with Boundary conditions aryisg Baie

fail urine sad hee edge, The aasiyns of moment and fore

may be made on the bans of any recegniged method, “However,

moment covfiiens, fr boundary conditions of wall pore
nan ave given in 18 73870 ( Pare IV Pt of

far general guidane

13. 15 3370 (Pare IL) -1965

54 Walls of Cylindsical Tanke — White designing walls of cylindric
fal cac the following points should be borse in Mind:

3) Walls of clinical tanks are either cat monolihieliy with the
base or ane atin grooves and bey Kaya (mavemen jon o Ta
thee cave deformation of the wall under the inci of guid
presos ie emricod a and above the bes Consenuemiy, Saly
part of the triangular hy wd will be cata by ring
iis adi ide verieal reinforcement aa 1 the wall
‘ere July xed tthe base in addition to the reinforcement tee
Gaurd rn horiesatal Fig tras for Bing at ae
Sons of vall unie the appropriate amount of y atthe hase
Be enabiihed by analysis val due crmideration tothe. dimer:
ions uf the bat a, the type of ine between the wall and a
ind, where applicable, the type of sol supporting he Bae had.

54 Cocficients for ring tension and vertical moments for diront
comidos of the walle fot aos canon cee are Ben In 1823570
(Bare 17519675 ibe general guide

6. ROOFS

{oof enrcespond with those in walls if roof and walls are moolithie. 1,
between the roof and the wally coreespondenc® af Joins te net 20

id covers of liquid retaining tractores should be
ed for gravity Ta cn the weight of rout slab, enrih Cover, if
oe upward load if the quid retaning sructune

2.1 A superficial load sufient to enure fey with the uncqual
intel of loading which coeur during the acing ot
Should Be allowed for in “The engineer should pci à

should De made fr the temporat
ed and other spaes unleaded, cren though I the
‘Baa state the load may be mal and evenly dba

14. uate made wateright. "This may be
forthe set of lao or by Une nee
waterproof membrane or by providing slopes Io ensure

7. DETAILING
7.1 Minimum Reinforcement
714 The miniwnum reinforcement ja walls, Roos and roof in cach of
two directions at right angle shall have an area of 09 percent oft
Shneretesetion in hat direction for sections up to 100 min thick. For
Sin of thickness greater than 100 mm and Les than 450 mm the
Anima einfoement in each of the two directions all be Inrarly
Feduced trom 03 present for 109 mm hick section to 02 percent re
350 Im thick econ. For econ of thickest restr than 480 me,
minimum reinforcement In cach of the two diretons shall be kept a
E ponen Ta mer ons of nes 2 mm or gree, o
layers of reinforeing wer shal be plaord one near each fase of te section
A A speed in thi else
reinforcement specified in 7.11 may be
high yet stength deformed’ bars
ing to 18 176619066 or 18 à 1199-1065,

2 In special circumstances (se 42) for slabs may be contracted
with percentage of reinforrment fen than that speifed above. Inno
‘ase the percentage of reinforcement In any member shall be les ıhan

caca in 1 496196

imum Cover to Reinforcement
y liquid faces of pasts of members either in contact with the
ie the space above the equi (auch ay ner ces ol oot
Im cover tal einforclment show be 25 am or the
‘isin bar, whichever greater. In the presence of sen
d water ef corrosive chaste he cover should be in
Sed by 12 mom but this adda cover tall not be aka into account
di calculations

15. 151 3970 (Pare 11)-1965,

92 For faces away from the Tid and fr pare of the car
form Yo the requirements of 15 : 436

Bars, Distance Between Bars, Lape and Bends — Subject
She requirements of Td and 732, detail regarding reaforcemeat
¿lance between bar, Ins and Benes in bars, and

"withthe préviens of 18 486-9640 and

7.32. Bends in Bars — In bends in scinrciog bara the oca rene on
const may De bernd o tee neste vale pemited in 332 for

7:32 Lapin Bars — Bars shouldbe lapped only when sch practice is
ves. Where ape ar ned they sould be signed in acordar
VE the reivan requirements of 8 11060

RÉ PRE Reg ago Rais eee ice

1”

16. 1813900 Pare At) 1965

el fo Concrete Codes, BDO 222: 1

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18. AMENOMENT MO. 2 AUGUST 198

0
70(Part 2)-1965 CODE OF PRACTICE FOR CONCRETE
STRUCTURES FOR THE STORY
PART 2 RENFORCED CONCRETE STR

(rage 3, clau
for the existing clei

10.3 Although the provistone of thi:

smetures for the storage of Liquids, the gen

requirments given in Fart 1 of this Code may Be
1 reine o