IS 802-1-2: Code of Practice for Use of Structural Steel In Overhead Transmission Line Towers, Part 1: Material, Loads and Permissible Stress, Section 2: Permissible Stress

19 Pages·1992·1.6 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 802-1-2 (1992): Code of Practice for Use of Structural
Steel In Overhead Transmission Line Towers, Part 1:
Material, Loads and Permissible Stress, Section 2:
Permissible Stress [CED 7: Structural Engineering and
structural sections]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 802 ( Part l/Set 2 ) : 1992

USE OF STRUCTURAL STEEL IN OVERHEAD
TRANSMISSION LINE TOWERS - CODE
OF PRACTICE
PART 1 MATERIAL, LOADS AND PERMISSIBLE STRESSES
Section 2 Permissible Stresses
( Third Revision )
tsriF tnirpeR MAY 1995
UDC 62 I *31 5.668.2
@ BIS 1992
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

December 1992 Price puorG 6
-
- - -. ..._ ._
larutcurtS gnireenignE lanoitceS ,eettimmoC CED 7
DROWEROF
sihT naidnI dradnatS ( drihT noisiveR ) was adopted yb the uaeruB of naidnI ,sdradnatS after
the draft dezilanif yb the larutcurtS gnireenignE lanoitceS eettimmoC had neeb devorppa yb the
liviC gnireenignE noisiviD .licnuoC
sihT dradnats has neeb prepared htiw a weiv ot hsilbatse mrofinu secitcarp for ,ngised -acirbaf
,noit gnitset dna noitcepsni of daehrevo noissimsnart enil towers. Part I of the dradnats srevoc
stnemeriuqer ni regard ot ,lairetam sepyt of towers, gnidaol dna elbissimrep stresses apart morf
other tnaveler ngised .snoisivorp snoisivorP for ,noitacirbaf ,gnizinavlag noitcepsni dna gnikcap
evah neeb derevoc ni Part 2 whereas snoisivorp for gnitset of these towers evah neeb derevoc ni
Part 3 of the .dradnats
sihT dradnats ( Part 1 ) was tsrif dehsilbup ni 1967 dna yltneuqesbus desiver ni 1973 dna 1977. nI
siht ,noisiver the code has neeb tilps ni two snoitces yleman noitceS 1 slairetaM dna ,sdaol dna
noitceS 2 elbissimreP stresses. Other rojam snoitacifidom effected ni siht noisiver ( noitceS 2 )
are as :rednu
a) elbissimreP stresses ni larutcurts srebmem evah neeb nevig ni smret of the dleiy htgnerts
of the .lairetam htiW the noisulcni of stlob of ytreporp ssalc 5.6 of SI 12427 : 1988,
elbissimrep stresses for these stlob evah osla neeb .dedulcni
)b lacitirC stress ni noisserpmoc Fcr has neeb deifidom for ssenkciht/htdiw oitar of the
selgna gnideecxe the gnitimil eulav for gnitaluclac the elbawolla tinu evisserpmoc
stresses.
c) evitceffE ssenrednels soitar ( KL/r ) for tnadnuder srebmem evah neeb dedulcni dna
snoisivorp rehtruf .detarobale
d) selpmaxE for the noitanimreted of ssenrednels soitar evah neeb dednetxe ot edulcni ‘K
dna ‘x’ sgnicarb htiw dna tuohtiw yradnoces .srebmem
sngiseD snoisivorp or other smeti ton derevoc ni siht dradnats llahs yllareneg eb ni ecnadrocca
htiw SI 800 : 1984 Code of ecitcarp for lareneg noitcurtsnoc ni leets ( dnoces revision )‘.
elihW gniraperp siht ,dradnats secitcarp gniliaverp ni the yrtnuoc ni siht dleif evah neeb kept ni
.weiv ecnatsissA has osla neeb devired morf the ediuG& for ngised of leets noissimsnart enil
towers’ ( dnoces noitide ) - ECSA launaM No. 52, deussi yb naciremA yteicoS of liviC sreenignE
( ECSA ) hew York, 1988.
roF the esoprup of gnidiced whether a ralucitrap tnemeriuqer of siht Code si deilpmoc ,htiw the
lanif ,eulav devresbo or ,detaluclac gnisserpxe the tluser of a test, llahs eb dednuor off ni -rocca
ecnad htiw SI 2 : 1960 seluR‘ for gnidnuor off laciremun seulav ( revised )‘. ehT rebmun of
tnacifingis secalp deniater ni the dednuor off eulav dluohs eb the emas as that of the deificeps
eulav ni siht .dradnats
IS 802 ( Part l/Sex 2 ) : 1992
Indian Standard
USE OF STRUCTURAL STEEL IN OVERHEAD
TRANSMISSION LINE TOWERS - CODE
OF PRACTICE
PART 1 MATERIAL, LOADS AND PERMISSIBLE STRESSES
Section 2 Permissible Stresses
Third Revision )
(
1 SCOPE exceed the gniwollof egatnecrep of the etamitlu
htgnerts of the :rotcudnoc
1.1 sihT dradnats ( Part teS/l 2 ) setalupits the
elbissimrep stresses dna other ngised sretemarap laitinI dedaolnu noisnet 35 tnecrep
ot eb adopted ni the ngised of gnitroppus-fles
laniF dedaolnu noisnet 25 tnecrep
leets ecittal towers for daehrevo noissimsnart
.senil
dedivorp that the etamitlu noisnet rednu -yreve
yad erutarepmet dna lluf dniw or muminim
1.1.1 ,slairetaM epyt of towers, gnidaol dna
erutarepmet dna sdriht-owt dniw erusserp does
nekorb eriw snoitidnoc are derevoc ni noitceS 1
ton exceed 70 tnecrep of the etamitlu elisnet
of siht .dradnats
htgnerts of the .elbac
1.1.2 snoisivorP no noitacirbaf dna gnitset of
noissimsnart enil towers evah neeb derevoc ni 5 ELBISSIMREP SESSERTS
Part 2 dna Part 3 ylevitcepser of the .dradnats
5.1 laixA Stresses ni noisneT
NOTE - elihW gnitalumrof eht snoisivorp fo siht
dradnats ti sah neeb demussa taht eht larutcurts ehT detamitse elisnet stresses no the ten -ceffe
snoitcennoc era hguorht .stlob evit lanoitces areas ( see 9 ) ni suoirav ,srebmem
llahs ton exceed muminim deetnaraug dleiy
1.2 sihT dradnats does ton revoc deyug towers.
stress of the .lairetam revewoH ni case the
esehT lliw eb derevoc ni a separate .dradnats
elgna noitces si detcennoc yb eno gel ,ylno the
detamitse elisnet stress no the ten evitceffe
2 SECNEREFER
lanoitces area llahs ton exceed FY ,where F, si
the muminim deetnaraug dleiy stress of the
ehT naiduI sdradnatS detsil ni xennA A are
.lairetam
yrassecen stcnujda ot siht .dradnats
5.2 laixA Stresses ni noisserpmoC
3 YROTUTATS STNEMERIUQER
5.2.1 ehT detamitse evisserpmoc stresses ni
3.1 yrotutatS tnemeriuqer as dial nwod ni the
suoirav srebmem llahs ton exceed the seulav
‘Indian Electricity Rules. 1956’ or yb yna other
yrotutats code elbacilppa ot hcus serutcurts nevig yb the ealumrof ni 5.2.2.
llahs eb .dewollof
5.2.2 ehT elbawolla tinu stress F,, ni MPa no
the gross cross lanoitces area of the yllaixa
3.2 ecnailpmoC htiw siht code does ton eveiler
dedaol noisserpmoc srebmem llahs :eb
yna eno morf foytilibisnopsereht gnivresbo lacol
dna state ,swaleyb erif dna ytefas swal dna other
livic noitaiva stnemeriuqer elbacilppa ot hcus a) ,Fx]a)-$+(f-l[=*F
.serutcurts
nehw KLIr < CC
4 RO’lCUDNOC NOISNET ,dna
4.1 ehT rotcudnoc noisnet at yadyreve -arepmet 9 x E nehw KLIr > CC
erut dna tuohtiw lanretxe daol dluohs ton b, Fa = ( KL/r )’
1
IS 802 ( Part l/Set 2 ) : 1992
where Table I Ultimate Stresses in Bolts, MPa
c, = 77 ’I TF; ( Clause 5.4 )
FY = muminim deetnaraug dleiy stress of
the ,lairetam MPa Nature of Stress Pemirsible Stress Remarks
for stloB of
E = ,suludom of yticitsale of leets that si Property clncs
2 x 5ol MPa, C--4+
5.6
KL/r - tiegral evitceffe ssenrednels oitar of
yna decarbnu tnemges of the ,rebmem (1) (2) (3) (4)
Shear
L = decarbnu htgnel of the noisserpmoc raehS sserts 011 gross 218 31G roF gross area
rebmem ( see 6.1.1 ) ni ,mc dna area of stlob of stlob ( see
r z etairporppa suidar of noitaryg ni .mc ni10. elbuod4). roF shear stlob
the area ot eb
demussa llahs
5.2.2.1 ehT ealumrof nevig ni 5.2.2 are -ilppa eb eciwt the
elbac dedivorp the tsegral htdiw ssenkciht oitar area denifed
b/t si ton erom naht the gnitimil eulav nevig Bearing
:yb
gniraeB stress no 436 620 roF the tlob
( b/t )lim =z /i/012 F- y ;;;of retemaid of area in bearing
( see 10.5 )
where Tension
laixA elisnet stress 194 2.50 -
b= ecnatsid morf edge of tellif ot the
emertxe erbif ni ,mm dna
6 SLENDERNESS SOITAR
t = ssenkciht of egnalf ni .mm
6.1 ehT ssenrednels soitar of noisserpmoe dna
5.X2.2 erehW the htdiw ssenkciht oitar exceeds tnadnuder srebmem llahs eb denimreted as
the stimil nevig ni 5.2.2.1, the ealumrof nevig :sv\ollof
ni 5.2.2 llahs eb desu gnitutitsbus for .& the
eulav F,, nevig :yb Type of Members Value of KL]r
)a ,eF = C1 .677 _ E77_( b/t ) x F a) Compression Members
( bit him I Y )i Leg snoitces or tnioj
Llr
nehw ( tib mih < b/t Q 3781 F/, srebmem detlob ni htob
,una faces at snoitcennoc for
0 c L/r Q 120
65 550
b) Fe, = ( b,t )_ nehw b/t > 378J,;./ 7;;1;- )ii srebmeM htiw cirtnecnoc
Llr
gnidaol at htob sdne of
NOTE - The,maximum elbissimrep eulav of rl/b for the detroppusnu 1enap
any type of steel shall not exceed 25.
for 0 < L/r c 120
5.3 ehT tnadnuder srebmem llahs eb checked )iii rebmeM htiw cirtnecnoc 30 t-0.75 L/r
yllaudividni for 2.5 tnecrep of laixa daol deirrac gnidaol at eno dne dna
yb the rebmem ot hcihw ti .stroppus lamron gnimarf -necce
yticirt at the other dne
5.4 Stresses in Bolts of the detroppusnu lenap
for 0 c Ljr c 1.20
etamitlU stresses ni stlob gnimrofnoc ot -orp
ytrep ssalc 4.6 of SI 6639 : 1972 dna ot ytreporp )vi rebmeM htiw lamron 60 + 0.50 L/t
ssalc 5.6 of SI 12427 : 1988 llahs ton exceed the gnimarf seiticirtnecce at
eulav nevig ni elbaT .I roF stlob gnimrofnoc htob ends of the -nu
ot SI 3757 : 1985, elbissimrep stresses dna other detroppus lenap for
snoisivorp gninrevog the esu of hgih htgnerts 0 c L/r c 120
stlob ecnerefer llahs eb edam ot SI 4000 : 1992.
IV rebmeM deniartsernu L/r
5.4.1 erehW the lairetam of tlob dna the -curts tsniaga noitator at htob
larut rebmem are of tnereffid grades, the sdne of the detroppusnu
gniraeb htgnerts of the tnioj llahs eb denrevog 1enap for 120 c Lfr S
by the rewol of the two. 200
a
SI 802 ( Part teS/l 2 ) : 1992
)iv rebmeM yllaitrap -ser 28.6 + 267-O L[r 7 MUMINIM SSENKCIHT
deniart tsniaga noitator
at eno dne of the -pusnu 7.1 muminiM ssenkciht of dezinavlag dna
ported lenap rnf 120 < detniap tower srebmem llahs eb as :swollof
L/r < 225
)iiv rebmeM yllaitrap -scr 46*2+0*615 L/r Minimum Thickness, mm
deniart tsniaga noitator detnia?;%nxa% ’
at htob sdne of the -nu
detroppus lenap for Leg ,srebmem dnuorg 5 6
120 < L/r < 250 eriw peak rebmem dna
rewol srebmem of
)b Redundant srebmeM cross smra ni noisserpmoc
)i roF 0 < L/r c 250 Llr
Other srebmem 4 5
NOTE - ehT seulav fo KL/r gnidnopserroc ot f a )
iv( ) dna (a ) ( iiv ,) eht gniwollof noitaulave si 7.2 tessuG setalp llahs eb dengised ot tsiser the
:detseggus shear, tcerid dna laruxelf stresses gnitca no the
weakest or lacitirc .noitces tnartne-eR stuc
1 ehT deniartser rebmem tsum eb detcennoc ot eht
gniniartser rebmem htiw at tsael owt .stlob llahs eb dediova as far as .lacitcarp muminiM
2 ehT gniniartser rebmem tsum evah a ssenffits ssenkciht of tessug llahs eb 2 mm erom naht
rotcaf Z/L ni eht sserts enalp ( Z = tnemoM fo ecittal ti stcennoc ylno ni case nehw the ecittal
aitreni dna L = htgneL ) taht slauqe or sdeecxe si yltcerid detcennoc no the tessug edistuo the
eht mus fo eht ssenffits srotcaf ni eht sserts enalp
gel .rebmem nI on case the tessug llahs eb ssel
fo eht deniartser srebmem taht era detcennoc
naht 5 mm ni .ssenkciht
ot .ti
3 elgnA srebmem detcennoc yb eno gel dluohs evah
eht seloh detacol sa esolc ot eht gnidnatstuo gel sa 8 TEN LANOITCES AERA ROF NOISNET
.elbisaef lamroN gnimarf seiticirtnecce at daol
REBMEM
refsnart noitcennoc ylpmi taht noitcennoc seloh
era detacol neewteb eht leeh fo eht elgna dne eht
enilertnec fo eht gnimarf .gel 8.1 ehT ten lanoitces area llahs eb the tsael area
hcihw si ot eb deniatbo yb gnitcuded morf the
gross lanoitces area, the area of lla seloh tuc yb
6.1.1 nI gnitaluclac the ssenrednels oitar of the
yna ,thgiarts lanogaid or gazgiz enil across the
,srebmem the htgnel L dluohs eb the ecnatsid .rebmem nI gninimreted the latot area of the
neewteb the snoitcesretni of the ertnec of
seloh ot eb detcuded morf gross lanoitces area,
ytivarg senil at each dne of the .rebmem
the lluf area of the tsrif eloh llahs eb ,detnuoc
sulp a noitcarf part X, of each gnideeccus eloh
6.2 selpmaxE gniwohs the noitacilppa of the
tuc yb the enil of seloh rednu .noitaredisnoc
erudecorp nevig ni 6.1 dna 6.1.1 dna dohtem of
ehT eulav of X llahs eb denimreted morf the
gninimreted the ssenrednels oitar of sgel dna
:alumrof
sgnicarb htiw or tuohtiw yradnoces srebmem.
are nevig ni xennA .B p2
-]=’X
W
NOTE - erehW tset ro/dna stsylana etartsnomed
taht yna rehto epyt fo gnicarb nrettap fi dnuof where
yllacinhcet ,elbatius eht emas nac eb .detpoda
P= lanidutignol gnicaps ( stagger ), that si
6.3 ehT gnitimil seulav KL/r llahs eb as the ecnatsid neewteb two evisseccus
:swollof seloh ni the enil of seloh rednu -isnoc
;noitared
Leg ,srebmem dnuorg eriw peak 120
rebmem dna rewol srebmem of gx esrevsnart gnicaps ( eguag ), that si
the cross smra ni noisserpmoc the ecnatsid neewteb the emas two
Other srebmem gniyrrac -moc 200 evitucesnoc seloh as for P; dna
detup stresses d= retemaid of .seloh
tnadnudeR srebmem dna those 250
gniyrrac lanimon stresses roF seloh ni etisoppo sgel of ,selgna the eulav
of g dluohs eb the mus of the seguag morf the
6.4 ssenrednelS oitar L/r of a rebmem gniyrrac kcab of the elgna ssel the ssenkciht of the
laixa noisnet ,ylno llahs ton exceed 400. .elgna
3
SI 802 ( Part teS/l 2 ) : 1992
9 TEN EVITCEFFE AREA FOR ANGLE ehT-ETON area fo eht gel fo na elgna llahs eb
NOITCES IN TENSION nekat sa eht tcudorp fo eht ssenkciht dna eht htgnel
morf eht retuo renroc sunim flah eht ,ssenkciht dna
eht area fo eht gel fo a eet sa eht tcudorp fo eht
9.1 In the case of elgnis elgna detcennoc ssenkciht dna eht htped sunim eht ssenkciht fo eht
hguorht eno ,gel the ten evitceffe noitces of the .elbat
elgna llahs eb nekat :sa
10 GNITLOB
A, + A,k
where 10.1 Minimum Diameter of Bolts
A, = evitceffe lanoitces area of the -cennoc ehT retemaid of stlob llahs ton eb ssel naht
ted ,gel 12 .mm
,A =: the gross lanoitces-ssorc area of the
10.2 Preferred Sizes of Bolts
dercennocmt ,gel dna
stloB desu for noitcere of noissimsnart enil
k _ rA3
towers llahs eb of retemaid 12, 16 dna 20 .mm
,A + ,A
10.3 ehT htgnel of stlob llahs eb hcus that the
where gul selgna are ,desu the evitceffe -ces
threaded noitrop does ton eil ni the enalp of
lanoit area of the elohw of the elgna rebmem
tcatnoc of .srebmem ehT detcejorp noitrop
llahs eb .deredisnoc
of the tlob dnoyeb the tun llahs eb neewteb
3 ot 8 .mm
9.2 nI the case of riap of selgna kcab ot kcab
ni noisnet detcennoc yb eno gel of each elgna 10.4 ssorG aerA of tloB
ot the emas edis of ,tessug the ten evitceffe area
llahs eb nekat :>a roF the esoprup of gnitaluclac the shear stress,
the gross area of stlob llahs eb nekat as the
1A -, A, k .aninron area of the .tlob
where
10.5 ehT tlob area for gniraeb llahs eb nekat
A, dna ,A arc as dzniied ni 9.1, dna
as d x r where d si the lanimon retemaid of the
,tlob dna t the ssenkciht of the renniht of the
=k -.-r%_._-
,A5 + ,A parts .detnioj
9.3 ehT selgna detcennoc together -ot-kcab 10.6 ehT ten area of a tlob ni noisnet llahs eb
kcab ( ni tcatnoc ) or separated kcab-ot-kcab nekat as the area at the root of the thread.
yb a ecnatsid ton gnideecxe the aggregate -kciht
10.7 seloH for gnitloB
ssen of the detcennoc parts llahs eb dedivorp
at hctip ni enil ton gnideecxe 1 000 .mm ehT retemaid of the eloh dehcnup/dellird llahs
ton eb erom naht the lanimon retemaid of the
9.4 erehW the selgna are kcab ot kcab tub ton
tlob sulp 5.I .mm
detcennoc as per 9.3, each elgna llahs eb -ngised
ed as a elgnis elgna detcennoc hguorht eno gel II FRAMJNG
ylno ni ecnadrocca htiw 9.1.
11.1 ehT elgna neewteb yna two srebmem
9.5 nehW two tees are decalp kcab ot kcab tub nommoc ot a tnioj of a dessurt emarf llahs
are ton detcennoc as per 9.3, each tee llahs eb ylbareferp eb greater naht 20” dna reven ssel
dengised as a elgnis tee detcennoc ot eno edis naht 15” eud ot ytniatrecnu of stress -ubirtsid
of a tessug ylno ni ecnadrocca htiw 9.2. noit neewteb two ylesolc spaced .srebmem
ANNEX A
( Clause 2 )
LIST OF REFERRED INDIAN STANDARDS
IS NL). Title IS No. Title
800 : 1984 Code of ecitcarp for esu of 4000 : 1992 Code of ecitcarp for hgih -nerts
larutcurts leets ni lareneg -dliub gth stlob ni leets serutcurts
gni noitcurtsnoc ( revised) 6639 : 1972 lanogaxeH tlob for leets -curts
3757 : 1985 hgiH htgnerts larutcurts stlob serut
( second revision ) 12427 : 1988 noissimsnarT tower stlob
IS 802 ( Part l/Set 2 ) : 1992
33
ANNEX
( esualC 2.6 )
EXAMPLES OF DETERMLNATiON OF &LENDERNESS RATIOS
O-B elpmaxE fo gninimreted eht evitceffe htgnel fo noisserpmoc srebmem fo srewot desab no eht
noisivorp nevig ni 6.1 era nevig .woleb
B-l LEG MEMBER USING SYMMETRICAL BRACING
Method of Loading/ Slenderness Ratio
Rigidity of Joints
cirtnecnoC gnidaol $- morf 0 ot 120 -KL = &-
( r
L
oN tniartser at sdne -$- rv;
* DERUSAEM LENGTH
B-2 LEG MEMBER USING STAGGERED BRACING
Method of Loading/ Slenderness Ratio
Rigidity of Joints
cirtnecnoC gnidaol ro- L - L ro 0.67 -& morf 0
xxr
'99
= L -
r
ok tniartser at sdne _L_ or& ro 0.67 &- morf 120
xxr
* DERUSAEM LENGTH