vtu 7th sem civil qp

7/23/2019 vtu 7th sem civil QP

1/12

USN

t0cv764

Max.

Marks:100

(10

Marks)

(08

Marks)

(04

Marks)

(04

Marks)

(08

Marks)

(08

Marks)

Seventh

Semester

B.E.

Degree

Examination, Dec.2013

/Jan.20l4

Photogrammetry

and Remote Sensing

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Seventh

Semester

B.E.

Degree

Examination,

Dec.2013

/

Jan.2ol4

Estimation

and

Valuation

Time:

3 hrs.

Max.

Marks:100

Note:

l.

Question

No.

ONE

is compulsory.

2.

Answer

FOaR

questions

selecting

any TWO

questions

from

each

Part

B

and

Part

C.

PART

-

A

I

Prepare

a

detailed

estimate

for

a

residerrtiut-Effillhown

in

fig.

el

for the

following

items

of

a.

Earthwork

excavation

(@

Rs

100/m3.

b.

Size

stone

masonry

in

dla

r

's

@

ns

21501m3.

::

c.

First

class

brick work

in

supersrructu-re

in

cM l:6

(D,

Rs

3700/m3.

d. R.C.C

roolconcreting

@3500

Rs/m3.

PART.

B

2 Prepare

a

detailed

estimate

of

a

siptic

turTffi*

pit

shown

in

fig.

e2

for

the following

items

of works.

a.

Earth

work

in

excavation.

b.

1't

class

Brick

work.

3

a.

What

is

an

estimate?

Explain

the

different

types

of

b.

Briefly

explain

different

types of

contracts.

Write.the

detailed

specification

for

any

3 of the

following

:

a.

I't

class

brick

work

in

CM

(1:6).

Determine

the quantities

of

earth

work

in

mid

section

method

for

the

portion

of

a road

between

chainages

10

to

20.

RL

of

ground

along

the

centre

line

are

given

below.

The

formation

level

at

the

10"'chainage

is 107

and formation

width

of

road

is

10m

and

the

side

slope

of banking

are

2:1.

Length

of the

chain

is

30m. The road is

of

down ward gradient

I

in

150

up

to

chainage

14

and

then

the

downward

gradient

changes

to 1

in

100

and

also

prepare

an estimate

of

earthwork

at

the

rate

of

Rs

275lm'.

.uqx?x

ut9t*


7/12

10cv73

(15

Marks)

Write

short

notes

on

any

3

of the

following

:

a.

Tender and Tender

notice.

b. Measurement

book and

schedule of

rates.

c. Earnest

money

deposit

and security

deposit.

d.

Valuation

and

different

methods of valuation.

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Gradient

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Down

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150

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Down sradient

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100

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(15

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9/12

USN

Time:

3 hrs.

t0cY74

Max. Marks:100

(10

Marks)

(04

Marks)

(10

Marks)

(04

Marks)

Seventh

Semester

B.E.

Degree

Examination,

Dec.2013

lJan.20l4

Design

of

Prestressed

Goncrete

Structures

a.

c.

2a.

b.

6)

o

o

:

a

o

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L

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oo-o.;-

-y>

6e

ool

troo

= c.l

c+

ir bO

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ol

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o>

o2

a::

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(BO

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=ioa

L=

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x

.:a

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bov

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o=

so

tr>

VL

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0)

o

o.

Explain

the

concept

of using

structures,

What are

thE advantages of

prestressed

concrete structures compared to

R.C.C. structures?

(05

NIarks)

With

neat

sketches,explain

pre

tensioning

and

post

tensioning.

State

the advantages

of

these

Note:

7.

Answer

FIVEfull

questions,

selecting

ut

least TWO

questions

from

euch

part.

2.

Use

of

151343-1930 is

permitted.

3.

Assame any

missing data suitably.

PART

_

A

high

strength

concrete

and

high stfengt

With

a neat

sketch,

explain Hoyes

system

of

prestressing,

What are the important

losses of

prestress?

Explain

in detail.

List

the factors influencing

deflections.

A rectangular

concrete

beam,of

cross section 30cm deep

and

20cm

wide

is

pre-stressed

by

means

of

l5wires

of 5mm

diameter

located 6.5cm from

the bottom

of

the beam and 3 wires

of diameter

of

5mm.

2.5cmfrom

the

top. Assuming the

pre-stress

in the steel as 840

N/mm2,

calculate

the stresses

at

the extreme

fibres

of

the midspan section

when

the

beam

is

supporting

its

own weight over a span

of

6m.

If

a uniformly

distributed

live load

of

6kN/m

is

imposed,

evaluate

the

maximum

working

stress in concrete

the

density

of concrete

is

24

kN/m3.

(16

Marks)

3a.

b.

A rectangular

concrete

beam.

300mm deep and 200mm

wide is

prestressed

by

means of

flfteen 5mm

diameter

wires

located 65mm

from the bottom

of

the

beam and

three

5mm

wires, located

25 from

the

top of

the

beam. If the wires

are

initially

tensioned

to a stress

of

840

N/mm2.

calculale the

peicentage

loss

of stress in Jeel

immediately

after

transfer-

allowing

for

the

loss of stress due to elastic deformation of concrete.

Take E,

:

210 kN/mm2

4a.

b.

A

concrete beam

with

a cross sectional area of 32

x

103 mm2 and

radius

of

Gyration

of

72mm

is

prestressed

by a

parabolic

cable

carrying

an

effective

stress

ol1000

N/mm2.

The

span

of the

beam

is 3m.

The cable

composed of

6

wires

of

7mm diameter,

has

an

eccentricity

of

50mm at the centre

and

zero

at the supports. Neglecting

all

losses, find the

central deflection

of the beam for the

following

cases:

i)

Self weight

*

pre-stress;

ii)

Self

weight

+

pre-stress

+

live

load

of

2 kN/m.

(08 Marks)

A

pre-stressed

concrete beam

of

rectangular section 120mm wide and 300mm

deep, spans

over 6m. The

beam

is

prestressed

by a straight cable

carrying

an effective

force

of

180kN at

an eccentricity

of

500mm.

If

it

supports an

imposed load

of

4kN/m

and

the

modulus

of

elasticity of

concrete is 38

kN/mm2.

Compute the deflection at the

following

stages

and

check whether

they comply

with

the

IS

code specifications:

i) Upward

deflection under

(pre-stress

+

self

weight)

and

ii)

Find

downward deflation

under

(pre-stress

+

self

weight

*

imposed load) inducing

the

effects

of creep and shrinkage. Assume the creep coefficient to be

1.80.

(08

Marks)

c.


10/12

5a.

b.

6a.

b.

7a.

b.

A

pre-tensioned

prestressed

concrete beam

having

a

rectangular

section 150mm

wide and

350mm deep has an effective

cover of 50mm.

If

fcr:40

N/mm2,

&:

1600

N/mm2 and the

area

of

pre-stressing

steel

Ap

:

461mm2,

calculate

the ultimate

flexural

strength of

the.

PART

_

B

List and

explain

the types of

flexural failure.

uslng

IS: 1

343

code

recommendations.

List and

explain

the types of

shear cracks

in

structural

concrete.

standard code

IS

:

1 343 ieCbmmendations.

The

support section of

a

pre-stressed

concrete beam 100mm

widg and

250mm

deep,

is

required

to

support

an

ultimate

shear

force

60kN.

The

compressive

pre-stress

at the

centroidal axi's

is

5-N/mm2 the

characteristic

cube strength

of concrete

is

40N/mm2.

The

cover to the tensiqn'reinforcement

is 50mm.

If

the

characleristic

tensile strength

of

steel in

stirrups

is 250

N/mm2, design

suitable reinforcements

it

the

section using

the

Indian

t0cY74

(08

Marks)

(05

Marks)

(08

Marks)

(06

Marks)

(06

Marks)

(08

Marks)

section

using IS:1343

code

provisions.

(07

Marks)

c.

A

post-tensioned

beam

with

unbounded

tendons

is

of

rectangular section 400

mm wide

with

an effective depth

of 800

mm. The cross

sectional area of

the

pre-stressing

steel is 2840mm2.

The effective

pre-stress in

the

steel after

all

losses

s

900 N/mm2.

The

effective

span

of

the

beam

is

16m. If f.r:40

N/mm2 estimate the ultimate moment of

resistance

ofthe

section

c.

The

cross

section

of a

pre-stie$sed

concrete

beam

is rectangular

with a width of 350mm and

an overall

depth of

700mm.'The

prestressing

force

of

180kN

acts at

an eccentricity

of

190mm. If

the bending and twisting

momerlts at

the section are 80 and 20kN-m respectively.

Calculate the maximum

principal

tensile

stress at

the section.

i.

'1

Explain

the concept of stress

distribtrtion in End block.

The

end

block

of a

post

tensioned

pre-stressed

member

is

550mm

wide

and

550mm deep.

Four

cables each made up of 7

wires

of 12mm

diameter

strands and

carrying

a

force

of

1000

kN

are

anchored

by plate anchorages

150mrn

by

150mm,

located with their

centres at

l25mm

from the

edges

of the end block.

The

cable duct

is of

50mm diameter

the 28day cube

strength

of

concrete ler is 45N/mm2. the cube strength

of

concrete

at transfbr

f.i

is 25N/mm2.

Permissible

bearing stresses behind anchorages should

conform

with

IS I

343. The

characteristic

yield

stress

in mild

steel

anchorage

reinforcemqnt

is 260N/mm2.

Design

suitable

anchorage

for the

end

block.

(12

Marks)

Design'a'pre-tensioned roof Purlin to

suit the

data

below: Effective

span

:

6m,

applied

load'*

5

kN/m,

load factors:

for

dead

load: 1.4,

for live

load:

1.6,

concrete cube strength,

f.,

*

50N/mm2,

cube

strength at

transfer f"i

:

30 N/mm2,

tensile

strehgth of

concrete,

ft

:

1.7

N/mm2,

modulus

of

elasticity of concrete,

E.

:

34

kN/mm2, loss

ratio, 11

:

0.8,

permissible

stresses: at

transfer

:

compressive

stress,

f.t

:

15N/mm2,

tensile

stress, fn:

-1N/mm2

,

atworkingload:compressivestressf.*:17N/mm2,tensilestressf*:0.

7mm

high

tensile

steel

wires having

an

ultimate

tensile strength, fp,

:

1600

N/mm2

are

available fort

use.

(20

Marks)

*

,,

vtu 7th sem civil qp

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