Structural Engineering. Formation of Three-Dimensional System in ...

ovariesracialUrban and Civil

Nov 25, 2013 (3 years and 10 months ago)

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Area of master degree

training

2701
00.68 «
Building Engineering
»


Master degree program
s

«
Structural Engineering
»

«
Formation of T
hree
-
D
imensional
S
ystem

in Urban Planning
»

«
Technology of
Building Materials, Articles and Stru
c
tures
»

«
R
esource
-
saving

and Ecol
ogy
of
Building Materials, Articles and Stru
c
tures
»



Task

1 (
strength

of materials + reinforced concrete constructions).

1.
D
efine normal
tensions

in
elastic bar
section with parametres specified in
figure

at
longitudinal force
action
F=2
,
400
к
N

enclosed with an eccentricity
е
0
=25
cm
.

C
alculate
tensions

in
standard

section
of the bar
at
in
elastic
behavior

of a
tensile
region
material under the same conditions.

2.
Specify

the
components of technical and economic effect from
creating the
reinforce
ment

pretension
.


Task
2

(strength of materials + reinforced concrete constructions).

1.

Define geometric

characteristics
в
g
н
g
в
н
r
r
W
W
J
y
S
A
,
,
,
,
,
,
,
0

for
the section of the
element
made of perfectly elastic material (
shown in figure
)
.
E
xplain
the
concept «
core of
section
».

2.

D
efine
flexural rigidity

of the element
shown in figure

if it is made of
the
natural
hardening
concrete
of B30 class
and loaded by short
-
duration

load.

3.

Define

the
practical
ways
,

realized in
r
einforced concrete
construction designing
,

of
proper
weight reduction of
the reinforced concrete constructions

at the cost of reducing the
concrete
consumption
.

b =30см
h =10см
b=10см
h=30см
f
'
'
f

Task
3

(strength of materials +
metal

constructions).

Test the
durability of a steel
welded
plate

beam
, made of three
sheets

(
beam

w
all

is
made of
1160
х
10
mm sheet
,
beam

booms

are made of
400
х
20
mm sheets
), in
the
midspan
and on
the crutch
.

The
beam
,

cut by
the

12m
span
,

is
loaded
uniformly

by
distributed load
with
the
intensity

of
q=150kN p
/m
,
it

is made of
steel
С
245.
Make c
alculation
s

in
the

elastic sta
ge.

Task
4

(strength of materials +
metal

constructions).

Test

the
stability of
the 6m
height

post

with pin
-
edge fixing

and
axial force

of
F=1
,
500kN
. The
post is

welded,
with
I
-
shaped cross
-
section

and

it is

made of three sheets
(
post wall is made of

380
х
8
mm

sheet
,
post flanges

are made of
300
х
12mm

sheets
).
Sheets
are made of

steel
С
245.

Task
5

(strength of materials + reinforced concrete constructions).

Test

the
stability
of the
standard section at
long
-
term action
loading
(
q+v=64kN p
/
rm
)
for a collar beam

of the braced frame of
multistorey building
.
Concrete
of high
-
specific
weight (
class
В
25
)
,
compressive zone

boundary height
is
604
,
0

R

.

L=6м
1
1
h =0,45м
с=0,15м
h =0,4м
0
coc
h =0,4м
coc
с
в

230
220
450
в =550
в =300
2
O
12
А- III
в
f
50
4
O
25
А- III
1- 1

Task
6

(
building
mechanics

+ reinforced concrete

constructions).

1.

Make

bending moment diagram
s and
formula for
determining
peak values at
uniformly distributed loading
0
P

f
or rectangular isotropic slabs

with simple rigid support

shown in
the
figure
.

2.

Define
bending moment
value

in
the
midspan
and
sag of span
(
µ=0.15
)

f
or a slab
(shown in the figure)

with
sizes
of
а
=1
.
4
m,
в
=2
.
0
m

and
р
=10
к
N
/
m
2
.

3.
Make schemes
of
reinforcing
the
main reinforcement

(
using

plans and
sectional
elevation
s
)

f
or
reinforced

slabs
sh
own in
figures
a, b,

c
.
Show the
effective depth of
the
each slab
section
.

а)
б)
в)
х
у
а
в
0,5 <= a/b <= 1
в
а
a/b < 0,5
в
а

Task
7

(
building
mechanics

+
metal

constructions).

D
efine
the force

p
N
,
fit the section

and
test

the
diagonal
rod

stability
(1


2)
of
the
trussed rafter
.
T
russ

shafts

are made
up
of two
angles

in
to

the
tee section
.
Gusset plate

thickness
is

10
mm.
D
iagonal
rod

is made of
steel
С
245.
Installed panel load is
кН
F
60

.

F
F
F
F
F
F
F
2150
6000
6000
6000
6000
3000
3000
3000
3000

Task
8

(
building
mechanics

+ reinforced concrete constructions).

1.
In
a double
-
span beam
of

continuous

stiffening
d
efine
the
values of the
moment of
support
,
the maximum span

moment and
the
shear under uniformly distributed load
q=20kN/m

and spans

l
1
=l
2
=l=6m
.

2.
F
ormulate the concept of plastic hinge in reinforced concrete
constructions
.
D
e
fine

the magnitude of the bending moment in the plastic hinge
.

3.
S
how the bending momen
t diagram obtained by taking into account the formation
of plastic hinge
with
intermediate support
section
(
B
)

f
or
a
beam with
definite
M

and

Q

of
the elastic state.

3.
Explain the technical and economic effect of accounting
the
inelastic
material
deformat
ion

in
reinforced concrete
during th
e static analysis of
constructions
.

q
l
l

Task
9

(
building
mechanics

+
metal

constructions).

De
f
ine the effort
,

find
the
section and
test

the
support

capacity of the
tie
-
beam

with
parallel

chords
.
T
he
chord

has a constant cross
-
section along the
truss
length and is
composed of two parts.
Chord m
aterial
is
steel
C
.
C
alculated
nod
al

load

is

F=6
0
kN
.


Task
10

(
building
mechanics

+
wooden and plastic

constructions).

Test

the
s
tiffness

of
top

chord

rectangular cross
-
section of
the laminated
wood
segmental
truss
. The
cross
-
section
width

is

14cm, height
is

26cm
.

Design strength
of
the
second
-
rate
wood

is
R
c
=15MPa
.
Design

linear load on the
truss is
q=
11
kN/m
.

The
top

chord

is propp
ed
of the plane

by 5
m

purlin
s.


Task
11

(
building
mechanics

+
soil mechanics

+ foundations
).

In a single
-
span industrial building with a rigid con
crete frame
t
he area of base

of the
post foundations
,
laid at a depth of
d=2.55m
, is
A=6.48m
2
;

the pressure under the
foundation base

is
p=300kPa
;

the
specific gravity

of soil above the base

is
γ=11kN/m
. The
base represented by an inhomogeneous layer of sa
nd
s
. Deformation
soil
modulus

(1 and 2)

a
t the
foundation
base are
E
1
=30MP
a

and
E
2
=40MP
a
,
respectively
.
Using the

method of
equivalent layer
,

define the foundations
settlements

and
make

a

design
diagram

for the
determination of additional
frame
points, ari
sing
because of the settlement
difference.
Take
the ratio of the equivalent layer
of
05
.
1

m
А


if
the Poisson's ratio of soil

is
2
.
0


;
ratio is
9
.
0


.

Task
12

(
soil mechanics

+ foundations +

reinforced

concrete

con
structions).

Check the
size
correctness of the monolithic
reinforced
concrete foundation
base of
the
industrial building
without
cellars
for

the column
with the
cross section
of
300
x
300 mm
.

Make the capacity calculation

of
the foundation. Shuttering
founda
tion
size
s

are shown in
Figure (planning mark

is
0.0
).

The standard

centered column load

in the
top
-
edge

foundation level
is

N=1
,
320kN
.
The length of
the building bay is
L=72m
, the
building
height
is
H=18m
. Engineering
-
geological conditions of the
building

area have
the following data:
there are the grounds
with
the
average bulk density
of
γ
1
=1
7
kN/m
3

above the foundation base
;
there

is

the
clay
loam with
the
bulk density
of
γ=
20
kN/m
3
,
with the
angle of internal friction

of

22



and
adhesion
of
c=28kPa

below the
foundation
base
;

flow index

is

3
,
0

L
J
.

900
450
450
1800
400
450
900
2100
1050
1050
900
900
300
300
300
300
300
300
700
2400
- 0,15
- 2,55

Task
13

(
soil mechanics

+ foundations +

reinforced

concrete

constructions).

De
f
ine
footing
depth and breadth
of the
outside
-
wall
precast
continuous

footi
ng
of
the
brick building.

The length of the building
is
L=10 m
, height
is
H=30m
,
outside
-
wall

thickness
is

0
.
51m
. The building has a
cellar with

t
he
2,2m

reference mark

of the cellar
floor
.

Ground
-
floor

floor
m
ark
0.0 is

h=0.6m

higher than planning mark
.
R
ated load on the
top

foundation
edge
is
N=376kN/r
m
.
Standard

freezing depth
is

d
fn
=
1
.
3m
,
calculated

average daily
temperature in the
cellar

is

t=+10
°
C
.

Ground conditions of the
building bay
:
there is the earth fill
with
the
specific density
of
γ
1
=1
6
kN/m
3

f
rom the surface to the 1.0m depth
;

there is the
high
-
plastic
clay loam with
the
index of liquidity of
J
2
=0
.
30
,
with

the specific density of
γ
2
=
20
kN/m
3
,
with
adhesion of
c=2
2.5
kPa

and the
angle of internal friction

of
21


°

till 5m depth bel
ow

the foundation
base
.


Task
14

(
soil mechanics

+ foundations
).

Using

the
method of layer
-
by
-
layer

summation de
f
ine the
settlement

of the
continuous

footing

with the
width
of
B=1
.
6m
,
the
continuous

footing

is
at
the
depth of
d=
2.0m
. The
pressure under the foundation base
is
p=210kPa
.
There are the grounds with the average
bulk
density of
γ
1
=17kN/m
3

above the foundation base
.

There are
sandy loam
layers with the
thickness of
h=1
.
6m

and the

deformation modulus
of
E=12MPa

under

the foundation base
.

There is a

high seam

of large compact sends
with
the
deformation modulus
of
E=50MPa
.
T
ake into
consideration
that
the foundation settlement
happens
mainly due to
sandy loam

compaction, i.e.

limit the depth of the
compressible thickness

with the
value
of
H
c
=1
.
6m
.

zp
(
кПа)

Task
15

(
soil mechanics

+ foundations +

concrete

constructi
ons).

Define

active and passive
ground

pressure on a massive smooth re
vetment

wall and
calculate the stability factor
of the wall
k
st

using

the
in
-
plane shear

scheme
.
Scheme
for

the
calculation
is
shown in Fig
ure.


Use

the follo
wing characteristics of
grounds

and the
wall
foundation in accordance with the
numbering of layers in the scheme:

γ
1
=
20.2
kN/m
3
;
0
1
32


;
γ
2
=
20.5
kN/m
3
;
0
2
35


;
γ
3
=
20.0
kN/m
3
;
0
3
30


.
S
pecific
concrete
density

in the
w
all
body is
3
/
22
m
кN


,
the
friction
coefficient of
the
wall
material on the
base
ground
is

f=0
.
50
.

Task
16

(
architecture

+ reinforced concrete constructions).

1.
According to the
space
-
planning decision

n
ame

the types of one
-
story frame industri
al
buildings depending on the characteristics of the
manufacturing
process. Describe the types of
buildings and provide the relevant
diagrams
.

2.
Make

the diagram

of
the diameter
of double
-
span single
-
storey industrial building with
overhead cranes

and

wit
h the
construction
s

made
of
p
recast
reinforced

concrete.

3.
F
ormulate the
concept

of
the
groups of the ultimate state of concrete and reinforced
concrete
con
struct
ion
s.

Name
the main
procedures of designing

for

concrete and reinforced concrete
con
struct
ion
s in accordance
with
Construction Rules and Regulations

2.03
.01
-
84.
Concrete and
reinforced concrete
constructions
.

Task
17

(
architecture

+ reinforced concrete constructions).

State

the
packaging approach

for
the precast reinforced concrete frame
of civil
building,
structural schemes

and
basic information
about

frame

design
.

Stages of
the

test
:

1. C
onditions determining the
selection

of structural frame scheme

of
the
building
.

2.
S
tructural

scheme
s

of frame buildings.

3.
Structural elements and their role i
n providing
the
three
-
dimensional

rigidity of the
building.

Task
18

(
architecture

+
metal

constructions).

Show

the
covering
process of
the heated one
-
story industrial building with a
galvanized profiled
fl
ats
on

the purlins
.
R
oof truss

is made of steel, th
e span is
24m with
parallel
chord
s
;

the slope of the
top chord

is
1
.
5%
;

the truss has

a triangular
truss web
with
back brace
s
.

Show

in
the section the composition and
function

of the
roof
elements.

According to the strength

condition
s,

find
the
purlin

sect
ion with the following data:

step
of
trusses
is

6m;

size of the panels of the
top

chord (step runs)
is

3m;

purlin
material
is

steel
C
245;

design load on the cover (including snow loads)
is

3
.
2kN/m
2
.

The calculation must take into account limited plastic de
formation
s
.

Task
19

(
architecture

+
building technology
).

Describe the
structural
-
technological types of monolithic and precast
-
monolithic
buildings,
areas of their
applications,
and
lift
-
slab method

of
building
erection
.

Stages of the test

1.
Building sys
tems used for
the

buildings

mentioned above
.

2. Application

areas.

3.
I
ndustrial methods of monolithic construction.

4.
L
ift
-
slab method

in
building
erection technology.

Task
20

(
building materials

+
wooden and plastic

constructions).

Given: t
hree
-
layer plastic
prevention
plate
;

it is
consist of
the
clothing

of
sheet
glass
-
reinforced polyester

and
average
-
level
styrene
polyfoam

of
class
50. De
f
ine the
polyfoam

thickness
on the basis of its
heat and physical

properties for
Moscow
climatic zone.
F
lagstone

clothing
is negligible
.
Then specify the stages of static design calculations.



Task
21

(
building materials

+
reinforced concrete constructions).

1.
How much time does
the
concrete strength
need to increase the strength in a more
intensive way i
n normal natural conditions? The concrete is
made
of

Portland cement
.

How
to determine
analytically
the
strength

for such
concrete
at the age of
t

days? How can
the
concrete strength

of a construction

be
evaluate
d

experimentally?

2.
D
e
f
ine the bending mome
nt in section I
-
I
f
or centrally loaded foundation
with the
strength
F
act
=1200kN

at its
base
.
De
f
ine the
size

of the longitudinal reinforcement
A
s

if the
adopted
class

of armature is
A
-
II and
the
arm of
internal
couple of forces
is
Z=0.9h
0
.
Give
the
diagram

of the longitudinal reinforcement of the foundation.


Task
22

(
building materials

and products
+
building technology
).

Give
a detailed scheme for calculating the
concrete
composition. Concrete is designed
for
foundation pour
, o
perating under the influence of groundwater.
T
he strength
class
of
concrete
is
M200.
Minimum
design
cross
-
section
is

400mm, minimum distance between
reinforcing bar
s

is

150mm. Concrete is expected to be laid with the help of
concrete
vibrator
y machine
s.

Ta
sk
23

(
building materials

and products
+
building technology
).

Erect the
superstructure

of the
eight
-
storey residential brick home in
the
central
part
of
Russia in winter.

Name

the
requirements for
building material
s
, additional structural and technologica
l
solutions

and the

methods of quality control during
o
perations and before
coming the
positive temperatures
.

Task
24

(
building materials

and products
+
metal

constructions
).

Make

stress
-
strain diagram

of
low
-
carbon steel (
diagram

"load


strain"
).

Show
on

the
diagram

the
yield
point

o
f steel

σ

and tensile strength

σ
u
.
Define w
hat is taken as
standard

resistance

and

determine the design resistance of steel
.

Define
the approximate carbon
content
in the low
-
carbon

steel (steel
C
245).

Task
25

(
reinforced concr
ete constructions

+

building technology
).

1.
De
f
ine the carrying capacity of
the short
reinforced concrete column of rectangular
section,
which is
centrally loaded by
the
force
F
.

S
ection

sizes are
b
col

х

h
col
=40
х
40cm
.
Concrete
of

the post of B20 cla
ss
of
compression, longitudinal reinforcement
is made of
4
bars of 20mm diameter
(
class AIII
)
.
L
ong
-
acting
action

load
.

2.
Explain the functionality of transverse reinforcement in the column.

3.
Provide
tensile
and compression
stress
-
strain diagram
s for concrete
,

reinforcing
steel

with

physical yield
line
.

4.
What devices are used for temporary f
ixing of columns in the
socket
-
type
foundation
s
?

When
overlying
structure
s

can be installed

on these columns
?

Task
26

(
metal

constructions

+

building technology
).

Constru
ct

tie bar

joint
of the
welded
fringe
steel beam
s

which is joined with
the
column
. The
beam
s

flank
to

the column.
Calculate the attachment of the
carrying
table
(de
f
ine the height of the table
h
tb
) to the
column flange

using

the following initial data:

-

e
nd

reaction of the beam
is
F=400kN
;

-

b
eam
is
composed of three sheets (sheet
booms are
300
x
16mm
, wall
is the
sheet
of

1000
x
10mm
;

-

thickness of the
butt knife
-
edge o
f the beam
is
220mm
;

-

thickness of the edge
is

20mm
;

-

I
-
section steel column (wall
is the
sheet
of

380
x
10mm
,
flang
es
are

the sheets

of
3
0
0
x
1
2
mm
);

-

m
aterial
of the

column
is steel
C235;

-

carrying

table is attached to the column

fringe with

side
-
lap weld

and
fillet weld
;

the
manual welding
is used;

electrode type
is
E42.

Describe the tec
hnology of steel
beam

erection if the beams are s
upport
ed by

the
carry
ing column tables.