I
TII{IT
' II concrete
0.91
you imProve the
shear resist nce o
techniques? (M aY/JuNE 2012) ) llori2ontal cr axial prestcessir'g
) P
cable Preshcssing by inclincd 3r sloping
Vertical or transverse prestressitrg'
c{rhcrete beam usini5 prestressing
A
concordant cable is a tendon profilc in which the eccentricity is proportional cross. secticrr to the bending mcrrlent caused by an.v ioading on a rigidity supported statisticaiiy indeterminate structures cr prolile seconcraqr mornents are
8. Definc thc
*ii"h
do", not induce any redundant reactions and
hence
zero. .\
ilrm End hlock arl(i Anchci
nge ,one.
t he anchorage zone or end block of staii..oistress distribtrtion is'bonplex anrl
j
a post-tensioned prestsssed eoncrele elemenl. the
d.imensional in nature.
9. what'are the methods used in Ancho:'age zolre stress? (MA'/JUNE i009, MA'iJUNE 2012) I. Magnei method 2. Guyons method
.
.
3. Zienski antl Rowe,s method
10. What is mearrl try ,ratrsformation in pSC continrrous bcam? I he oDer
aiton ot disnlac.ins rh+
ill
le
?1
id-ermeCste sllppoii3 .*,hile holcling tlie posiiiols
of the end
anchorages constant without cranging the intrinsic shape transformation of the eable.
is known an rilear
1I. Whht is the effect if lransverse tensile stress on the end block? .The effecr of transverse st,ess is to develop.a zooe of bursting tension
ir
a direction
perpendicular to the auchorage force. resulting in horizontat cracking. 12.\ thal is rneant by. bursting fol.ce?
Thc rna!.erial along the a,xis oi thc corlcenl.rated force' is subjeuted io force calleti bursting force.
r
ransverse tensiie
13. i?hat is meant by spatt:ng force? The surface at end slctions just adjacent to the anchor plate is subjected tensile to force which is called spalling force
14. What are the methods ofstress analysis in anchorage zone? .1. Magnel rnethod 2. Guyons method 3..
Zensl:i au,IRow:s rnelhsd
4. IS codes nlethod 5, Iyyangar method
"2G'
-\-a/
.1sr"'
k* W
N
16, Why anchor trlock is uscd
l(5
!n PSC?
Atchor block are used as medium of trahsier of the pres essing force. The size of plaie arrd Ype of
anchoing managements govern the stress in concrete at the transfer zone.
L7. Why anchorage zone needs specific analyois',tnd design?
The transvct:se stresses cieveloped in the anchorage zotie are teusile in nature over a large
t--,rrhr qr,.l {rs i!,'b
sinr. ^.-^--.- ;. ",-^!. ;- r-rqi^h ^.r^.!,atp ."infcrcement
Shorrld be provid"al 16 lqsist
ttris tension. So that the anchorage zone needs specific analysis and Cesign. 18. What is meant by anchorage zone? What is its length? The zong betwee4 the end of the beam and the section where only longitudinal 1fres11s
generally refeffed to as anchorage zone or end block. The length is taken aqual to '.he depth
of
the bearn. Tb.e length ofthe zone is calleci transrnission zorte. 19. Horv is spailing {ensiorr taken care of in the anchorage zono?
Spalling tension is dcvekrped on thc cdge surt'aues on the beam adjacent ot the anihor plate. The Fpalling stress is rJ.irectly proportional to the beal'ing stresses imposed and inversely proportionai io the intervzil cf the i;earing fories. Lt rtiost cascs the spaliing stresses in tln region
of 0.3 P. /A to 0.4 P/A. 20. Statd Guyons theorem.
The continuous psc beam, ''
indeternrinate su!.ports by any
if
the tendon pic,fi le is displaced vertioally at any of the
ailoult but lvithout alterirrg its intrinsic shape betwcen the
suliporls, the iesultant Iirle oi ihrust is unchahged. 21.
Ithat are thc
reasons
for paltial prestressing
of
leructural'members'l (APMIAY
200E)
The clegree of prcstress applied to concrete il lvhich tensile stresses to a limited degree, are permitted in concrete under rvorking loads.
22, Wtzt is ffc 0VTAYTJII{E
zone
of
llt
'f-e retarcrn thi end of the beam apd the secticn where otliy iongitudinal ytEned
generaliy
stress is
ro as anchorage zone or end biock. T'he lenglh is taker, equal to dre depth of
tJre beanr.
Tae)lerrgh".rf the zone iscalled transrnission zone.
ESJWrite
\-/
do$ n any two ,issumPtions
sections. (NOv/DEC
1- The
'lf sirain compatittil it1, n,leihorl in prestressed
cotlcYelc
2011)
stress ciistribution
in the compressiorr zone.of conci€t9 can be defifred by means of
cqefECients applied to *re chatacteristic cornpressive sircngth and the average compressive stress
and the position of the centre of cornprgssion can be assessed.
L
The resistance ofconcrete in tension is
4- fbe ma'limum comprcssive strain
regleot?d.
.
the concrete at failure reaches a particular vaiue.
24. ivleiiti,ii ihc advanttgcs of pl:tir! p!".stressing? (Nov/DEC 2012)
to bear revetsai of stress, impect, vibration and sirock.
.
F
.
The use of ourved tendons and the pre compression of &e concrete belps to resisi
.)> The quantity of steei required for prestressing is abbve i/3'd of tltat required fbr
F
reintorcsd concrete though the steel for the former shouid have.high tensile strength. Presttess conirete beams have usually iow deflection-
25. Deline pariial presllessing. (MAY,'JtrNE
2013)
prestress applied to concrete perm.itted in concrere under working loaCs.
The degree of
in wbich tensile stresses to a limited
.26. Mention any two firnctions of end blocks. (MAY/'LIND
1. The forces
ol
degree dfe
2013)
the end block of a post tensioned prestressed concrete member is a PhYslcal
concept ofthe state ofstress in the hansverse direction'
2, The curvature of the struts, compressive stresses in zone.
being couvex towarcls the cent€ line of the block, induces
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