Steel Structures

BEYKENT UNIVERSITY

CIVIL ENGINEERING DEPARTMENT

STEEL STRUCTURE 2019-2020 SPRING

FINAL

Q.1. (40%) Determine the smallest NPI profile that can be used in members 1, 3, 5, 7, 10, 16 and 18.

Allowable stress in tension is σ = 260 N/mm2 and allowable stress in compression is σ = 190

N/mm2

A BA 3 m 3 m 3 m 3 m 3 m 3 m

4 m

1 2 3 4

5 6 7 8 9 10 11 12 13 14 15

16 17 18 19 20 21

150 kN 150 kN150 kN

CEVAP (ANSWER)

Çubuk Kuvvet Gerilme Min Alan

Bar Force Stress Min Area

kN N/mm 2

mm 2

1

3

5

7

10

16

18

mm 2

Seçilen Profilin Alanı

Area of the profile hosen

Seçilen Profil

Profile Chosen

Q.2. (30%) A load of 144 kN acts on the repeating section of the triple-riveted butt joint in following

figure. Length of section is 200 mm, diameter of rivet holes is 23.5 mm, thickness of main plate is

14 mm and of each cover plate is 10 mm.

a) Determine the shearing, bearing, and tensile stresses developed in the joint.

b) If steel plates are st37 quality and allowable tensile stress is 1.44 t/cm2, check the steel plate

and bolts are safe or not

Q.3. (30%) A beam shown in below figure. Left support is roller and right support is hinge. St37 steel

material used for design of the beam. Determine the minimum NPI profile that can be used if allowable

stress σ = 220 N/mm2

a) Draw Shear Force, Moment and deflection diagrams for the beam.

b) Determine the smallest NPI profile that can be used.

R o

w 2

( S

ır a

2 )

R o

w 3

( S

ır a

3 )

R o

w 1

( S

ır a

1 )

2 0

0 m

m 144 kN144 kN

d=23.5 mm

144 kN 144 kN

t=14 mm

t=10 mm

t=10 mm

A B

P=200 kN

4 m.1 m.

F = 100 kN/m.

250 kN.m