reinforced conrete topics

8/10/2019 Reinforced Conrete Topics

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Subject Name: DESIGN OF RC ELEMENTS Subject

Code:CE2306

PART-A

UNIT I

1. What are the advantages of limit state method over working stress and

ultimate load methods?

2. How do you find the moment of resistane of a !eam setion?

". #isuss the merits of working stress method?

$. What is modular ratio? #etermine the modular ratio at %2& gradeonrete.

'. What do you understand !y limit state of olla(se?

). #raw stress-strain urve for various grades of steel.

*. +tate the assum(tions made in working stress method.

,. What is modular ratio? #etermine the modular ratio at %2' grade

onrete.

UNIT II

1. #istinguish !etween one way and two way sla!s.

2. /(lain the terms 0!alaned 0over reinfored and 0under

reinfored setions in !ending

". #isuss the different limit state to !e onsidered in reinfored

onrete design?$. Why is it neessary to (rovide transverse reinforement in a one

way sla!?

'. What are the three !asi methods using fator of safety to ahieve

safe worka!le strutures?

). /(lain ma/imum de(th of neutral a/is.


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*. 3ind the de(th of neutral a/is in terms of 0d for a !alaned setion

using 3e $1' steel in limit state method.

,. What is the differene in the design of one way sla! and two way

sla!s?

UNIT III

1. What are the ty(es of reinforements used to resist shear?

2. /(lain the differene !etween (rimary and seondary torsion.

4ive two e/am(les eah.

". 5nder what irumstanes are dou!ly reinfored !eams used?

$. Reinfored onrete sla! are generally safe in shear and do not

re6uire shear reinforement? Why?

'. What is modular ratio?

). %ention the differene in design (rini(les for 7 8eam and T

8eam.

*. When shear reinforement is neessary in a !eam

,. What is !ond stress? Write an e/(ression for it.

UNIT IV

1 What is the minimum and ma/imum (erentage of steel allowed

in R.9.9olumn? /(lain why it is neessary to s(eify the

minimum and ma/imum (erentage.

2 4ive e/am(le of olumns that are in (ratie su!:eted to

una/ial and !ia/ial !ending.

" /(lain ;a< 6uili!rium torsion ;!< 9om(ati!ility torsion

$ How do you lassify a olumn as long?

' What will !e minimum and ma/imum area of tension

reinforement in a !eam?

) How shear reinforement im(roves the strength of !eam?

* How do you lassify a olumn as short or long?

, Write the (roedure for the design of an a/ially loaded short

olumn.


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Unit V

1. +keth the (laement of steel in retangular footing with a non-

entral load.

2. What are the situations in whih om!ined footings are (referred

over isolated footings?

". #raw a neat sketh of a masonry footing.

$. What is slenderness ratio for a masonry wall? +tate the ma/imum

values?

'. 9om(are the !ehavior of tied and s(irally reinfored olumn.

). How do you lassify one-way footing and two-way footing in

foundation?

*. 5nder what irumstanes a tra(e=oidal footing !eome

neessary?

PART-8

UNIT - I


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1. A singly reinfored onrete !eam is of width $'&mm and

effetive de(th *1'mm. >t is reinfored with ,os.2&mm mild steel

!ars. Assuming %2& onrete determine its moment of resistane

aording to the working stress method. #etermine also the stressin steel when the !eam is su!:eted to the a!ove moment.

2. #etermine the reinforement for a T !eam with flange width @

1'&&mm we! width @ "&&mm thikness of sla! @ 1&&mm

effetive de(th *"'mm to arry a moment of ",&km due to

harateristi loads. 5se %2' onrete and 3e $1' steel. 5sing

Working +tress #esign.

". A singly reinfored onrete !eam is of width $&&mm and

effetive de(th )1'mm. >t is reinfored with ,os.2&mm mild steel

!ars. Assuming %2' onrete determine its moment of resistane

aording to the working stress method. #etermine also the stress

in steel when the !eam is su!:eted to the a!ove moment.

$. #esign a retangular sla! su((orted on its all four edges ;)&&mm

thik< over a lassroom of si=e $.,m /).2m. Two ad:aent edges of

the sla! are disontinuous and the remaining two edges are

ontinuous. A finishing surfae of ement onrete of 2&mm shall!e (rovided over the sla!. The sla! shall !e used as lassroom.

%2& grade of onrete and H+# !ars shall !e used. The unit

weight of finishing surfae onrete is 2$BCm".

'. #esign a retangular !eam setion su!:eted to an ultimate

moment of 12&km. 5se onrete %2& and steel 3e$1'. Ado(t

limit state method.

UNIT II

1. A retangular !eam has !@2&&mm d@$&&mm if steel used is 3e

$1' and grade of onrete is %2'. 3ind the steel re6uired to arry a

fatored moment of 12km.


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UNIT III

1. A retangular !eam width !@"'&mm and d@''&mm has a

fatored shear of $&&k at the ritial setion near the su((ort.

The steel at the tension side of the setion onsists of four

"2mm !ars whih are ontinued to su((ort. Assuming fk@2'

and fy@$1';Cmm2< design vertial stirru(s for the setion.

2. A reinfored onrete retangular !eam has a !readth of "'&mm

and effetive de(th of ,&&mm. >t has a fatored shear of 1&'k

at setion DD. Assuming that fk@2' fy@$1';Cmm2< and

(erentage of tensile steel at that setion is &.'(erent

determine the torsional moment the setion an resist if noadditional reinforement for torsion is (rovided. Workout the

(ro!lem aording to >+$') (rini(les of design for torsion.

". A sim(ly su((orted !eam is 'm in s(an and arries a

harateristi load at *'kCm. >f )os. of 2&mm !ras are

ontinued into the su((orts. 9hek the develo(ment length at

the su((orts assuming grade %2& onrete and 3e$1'steel.

$. A retangular R99 !eam is $&&/E&&mm in si=e. Assuming the

use of grade %2' onrete and 3e$1' steel determine the

ma/imum ultimate torsional moment at the setion an take it.

;i< o torsion reinforement is (rovided and

;ii< %a/imum torsion reinforement is (rovided.

'. A retangular !eam width ! @ 2'&mm and effetive de(th

'&&mm reinfored with $ !ars of 2&mm diameter. #etermine

the shear reinforement re6uired to resist a shear fore of1'&k. 5se onrete %2& and steel 3e$1'.

). #esign a retangular !eam setion of width 2'&mm and

effetive de(th '&&mm su!:eted to an ultimate moment of


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1)&km ultimate shear fore of "&k and ultimate torsional

moment of 1&km. 5se onrete %2& and steel $1'.

*. A R9 !eam "&&/$'&mm in ross setion in reinfored with "

os. 2&mm diameter of grade 3e2'& with an effetive over of

'&mm. The ultimate shear at the setion of 1",kn.#esign the

shear reinforement ;i


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$&&mm. 5se the minimum (erentage of longitudinal steel.

Assume fy@$1'Cmm2and fk@2&Cmm

2.

2. An R.9.9olumn '&&/$&&mm is su!:eted to an a/ial ultimate

load of 2'&&k and !ent in single urvature a!out the minor

a/is with %y;to(


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1&&&k.The olumn is hinged at !oth ends. 5se onrete

%2' and steel 3e$1'.

,. A olumn "&&mm/$&&mm has an unsu((orted length of $m

and fi/ed at !oth ends. >t is su!:eted to a fatored load of

1&&&B and an ultimate moment of 2&&km a!out the ma:or

a/is. #etermine the longitudinal reinforement and lateral

ties. 5se onrete %2' and steel 3e$1' d@)&mm.

UNIT V

1.A retangular olumn "&&mm/$&&mm reinfored with 2&mm

diameter !ars arries a load of 1$&&k. #esign a suita!le footing

for the olumn. The safe !earing a(aity of the soil is

2&&kCm2.5se onrete %2& and steel 3e$1'.

2.#esign a om!ined retangular footing for two olumns s(aed at

' enters. The first olumn $&&mm/$&&mm arries a load of

12&&k and the seond olumn $'&mm/$'&mm arries a load of

1,&&kn at servie state. Weight of +oil @ 2&kCm2 angle of

re(ose@"&&and safe !earing a(aity of soil @ 1'&kCm2. 5se

onrete %2& and steel 3e$1'.

3.#esign a interior wall of a single storied worksho( of height '.$m

surrounding a R99 roof. The !ottom of the wall rests over a

foundation !lok. Assume roof load e6ual to $'kCm. A (ier(rovided at a s(aing of ".)m along length of wall.


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4.#esign a om(ound wall of height 1.,m to the to( of 1&&mm thik

o(ing. Assume wind (ressure is e6ual to 1kCm2and is 5#7. The

safe !earing (ressure of soil is 12&kCm2.

5.A solid footing has to transfer a dead load of 1&&&kn and an

im(osed load of $&&kn from a s6uare olumn $&&mm/$&&mm.

Assuming fk@2&Cmm2and fy@$1'Cmm2and safe !earing

a(aity to !e 2&&BCm2 #esign the footing.

6.#esign a om!ined retangular footing for two olumns s(aed at

'&&m enters. The first olumn "&&mm/"&&mm arried load of

1&&&kn.and seond olumn "&&mm/"&&mm arries a load of1'&&kn at servie state. Weight of +oil @ 2&kCm2 angle of

re(ose@"&&and safe !earing a(aity of soil @ 1'&kCm2. 5se

onrete %2' and steel 3e$1'.

7.A solid footing has to transfer a dead load of 1&&&k and an

im(osed load of $&&k from a s6uare olumn $&&/$&&mm ;with

1)mm !ars.< Assuming fy@$1' and fk@2&Cmm2and safe !earing

a(aity to !e 2&&kCm2. #esign the footing.

8.#esign a (lain onrete footing for a $'&mm wall arrying "&&k

(er meter length. Assume grade 2& onrete and the !earing

a(aity of soil to !e 2&&kCm2.

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