2E4: SOLIDS & STRUCTURES

tobascothwackUrban and Civil

Nov 15, 2013 (3 years and 6 months ago)

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2E4: SOLIDS & STRUCTURES


Lecture 1

Dr.
Bidisha

Ghosh

Notes:
http://www.tcd.ie/civileng/Staff/Bidisha.Ghosh/So
lids & Structures



What does the module cover?

The module covers two fundamental concepts:



Strength of Materials

(covered by
Bidisha

Ghosh
)



Theory of Structures

(covered by Alan O’Connor)



Recommended Text

It is a must that you
OWN

a book on the subject,

Mechanics of Materials/

Strength of Materials/

Mechanics of Solids


Buy it first or second hand

or download it


•Mechanics of Materials by A. C.
Ugural

(Wiley)

Structures

or why things don’t fall down by JE
Gordon (Penguin)

•Strength of Materials by S.
Timonshenko

Assessment


Written Exam (85%)


Two Laboratory Experiments (5% each)

o
Beam Bending

o
Column Buckling


10 tutorials (5 BG and 5 AOC)

Attendance is worth 50% of tutorial marks.

Students must attend the tutorial sessions during weeks 2
to 6, inclusive, and weeks 8 to 12:

Groups A and B: 9:00am to 10:00am in the Drawing Office,
Museum Building.

Groups C and D: 10:00am to 11:00am in the Drawing
Office, Museum Building.

Beam Bending


Load will be applied on a simply
-
supported beam

Beam Bending


The beam will bend with compression at top and tension
at bottom.


Deflection will be calculated using dial gauges.


The strain will be measured using strain gauges.


Stress will be calculated from the strain measurements.

Sensors

Strain and deflection gauges will be used.

Buckling of a Strut

Buckling is a large deformation produced under
compressive load in a direction or plane normal to the
direction of application of the load.

End conditions

Four different end conditions show four different shapes of
buckling.

Steps

Load bars with different end conditions in the loading
frames and observe the different shapes and critical load:

1) Effect of end condition:


Draw the first mode shape for the four different end
conditions in the small loading frame.


Measure the effective length for each end condition.


1I) Effect of length


Measure the critical load for two bars having different
length in the big loading frame.


Measure the width and depth of the section of the bars


Calculate the radius of gyration of the section of the bars.


Different End
-
Conditions