# POLYTECHNIC OF NAMIBIA

Urban and Civil

Nov 29, 2013 (4 years and 7 months ago)

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POLYTECHNIC OF NAMIBIA

SCHOOL OF ENGINEERING AND INFORMATION TECHNOLOGY

DEPARTMENT OF CIVIL ENGINEERING

February 2003

COURSE OUTLINE FOR:

STRUCTURAL DESIGN 3.1 (SDE 3300)

Semester
: S3

Lecturer
: W. Singoro (Office no. G
28

Ground floor, Engineering Building)

1.

INTRODUCTION

Structural Design 3.1

is an S
3 course for the National Diploma: Civil Engineering whose
aim is to enable the student of Engineering perform structural designs in steel and timber.
The course deals w
ith the practical design principles and techniques, including the use of
computer applications and therefore knowledge in usage of computers is an important
requirement. Pre
-
requisites for one to take the course is successful completion of the
courses
Theo
ry of Structures II (TST 1200), Mathematics 2 (MAT 1200), Construction 1B
(CON 1200) and Communication Skills 1 (COM 1100).

The course is tightly linked with the parallel course,
Structural analysis 2

(SAN 3300)

in
that the design of structures requires
an evaluation of the stresses generated within a
structure, a task achieved by applying techniques from the structural analysis course.

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2.

AIMS AND OBJECTIVES OF THE COURSE

The objective of this course is to equip the student with the skills and competence
to
design Civil Engineering structures in steel and in timber.

The particular aims are that on successful completion of the course, the student shall be
able to:
-

Correctly assess the types and magnitudes of loading that can be reasonably
expected to act

on buildings and related structures

Articulate the principles of the Limit States Design philosophy

Correctly determine the critical stresses induced by given loads in any given
structure’s components

Establish the appropriate size and cross sectional pro
file a steel member that is
needed to resist determined critical stresses

Determine and design suitable connections of steel members to resist stresses
reasonably expected to act on such connections

Appreciate the need for grading of structural timber as d
ictated by such
properties as orientation of the grain, extent of warping etc.

Determine appropriate sizes of timber elements required to resist given critical
stresses

Determine and design suitable connections of timber elements to resist
stresses reasona
bly expected to act on them

Use Prokon structural Engineering software to perform designs in steel and in
timber.

3.

The following are to be covered under the structural Design III module 1 course:
-

i)

ii)

Design
in structural steel

iii)

iv)

Computer applications in structural timber and structural steel design.

4.

EXERCISES, TUTORIALS AND PROJECT ASSIGNMENT

Students shall be given some course notes but are required to take down their own class
notes to sup
plement what they are given. There will be exercises and tutorials at regular
intervals as the course proceeds and every student is expected to work through these. In
addition, a project assignment will be given that each student will have to do and presen
t.
It is expected that the quality of work output by the students shall be of a quality
comparable to prevailing industry standards. Work of substandard quality will be
penalized.

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It is crucially important to note that because the delivery mode is via lec
tures and
tutorials, it is critical that each student attends all the scheduled lecture and tutorial
sessions. This is because due to the very nature of the delivery mechanism to be used, a
proportion of the material that will be delivered during these ses
sions will not be
accessible in an alternative format. In the event that a student has missed any sessions
due to valid constraints, it is incumbent upon such a student to make arrangements with
the lecturer within the shortest possible time after the miss
ed session in order for him/her
to be brought up to date with regard to the material that was covered during his/her
absence.

5.

CONSULTATION HOURS WITH LECTURER

The lecturer is available in the office for out
-
of
-
class consultations during the scheduled
t
imes as per the timetable displayed on the office door. For planning purposes, any
student wishing to utilize the allocated consulting hours shall make appointments in
advance. It is also possible, with necessary prior arrangements, to schedule consultatio
ns
with the lecturer outside the officially scheduled hours as per the timetable.

6.

COURSE EVALUATION

6.1

Two continuous assessment tests shall be taken by the students in the course of the
semester.

6.2

A project assignment shall be given to students in which

every student shall produce a
complete structural design presented in an acceptable format.

6.3

Final evaluation of the course will be based on the continuos evaluation of each
student’s performance based on the tests taken and the project assignment.
Calcul
ation of the course mark will be done as follows:
-

-

First continuous Assessment Test

=

30%

-

Second continuous Assessment Test =

30%

-

Project assignment

=

40%

-

Course mark

=

100%

6.4

To pass the course, the student must attain a course mark of
at least 50%.

6.5

Only valid excuses shall be acceptable for not attending a test. The lecturer shall
reserve a right to ask for a medical certificate and to contact any medical practitioner
in question to verify the situation. It is the student’s responsibil
ity to inform the
lecturer not more than 24 hours after the test date to make arrangements for an
alternative test date. The medical certificate, if applicable, must be produced for
s.

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6.6

This being a continuous evaluation course (i.e. not assessed by an exam at the end of
the course), regulations governing supplementary tests and reevaluations for
“boundary cases” are as outlined in the departmental regulations for all continuous
eval
uation subjects attached hereto.

7.

COURSE CONTENT AND WORK PROGRAM

Week no.

Topic

Week 1

introduction, code of practice for general

Week 2

structures

imposed (Live) loads on floors and roofs,

Week 3

Week 4

Limit State Design

Limit state approach, partial factors, Limit states

of structural members, Design analysis of
structures

simply supported beams, Continuos beams, pin
-
jointed trusses
and frames

Week 5

Structural steel element design

limit state design, axial compression
member design, classification of members; axia
l tension member design:
resistance & effective net area

C. A. Test 1

Week 6

Structural steel element design

members in bending: bending theory,
types of beams, continuos lateral support in beams & laterally unsupported
beams

Week 7

Str
uctural steel element design

deflection; shear; web stiffeners;
intermediate stiffeners

Week 8

Structural steel element design

Combined bending and shear; axial
compression and bending; axial tension and bending

Week 9

Structural steel conn
ection design

Bolted connections, welded
Connections

START OF PROJECT ASSIGNMENT

Week 10

Timber element design

introduction: source of structural timber,
variability in quality of structural timber; need for grading of timber,

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orientation of

grain in timber, various strength modification factors for
timber in structural design.

C. A. Test 2

Week 11

Timber element design

Section properties A, I and Ze, Limit states: the
load factors & resistance factors in timber design, Design of timber
m
embers in axial tension and Design of timber members in axial
compression and in bending and shear

Week 12

Timber element design

Design of timber members for deflection, design
of timber connections, designing of timber elements for fire.

Week 13

Computer applications in structural steel design

Week 14

Computer applications in structural timber design

HANDING IN OF PROJECT ASSIGNMENT

Week 15

Computer applications in structural timber design

8.

1.

Structural Steelwo
rk

T.J. Macginley & T.C. Ang

2.

Judith J. Stalnaker & Ernest C. Harris

The following codes of practice will be issued to the students:
-

SABS 0160

the design of buildings

SABS 0162

1: 1993: Limit states design of hot rolled steelwork

SABS 0163

Structural use of timber

9.

DETAILED COURSE SYLLABUS

9.1

Structural steel Design

9.1.1

Introduction

Locally applicable Structural steel design code, SABS 0162 part 1: 1993;
existence of oth
er design codes e.g. BS Steel design code.

9.1.2

9.1.3

Limit state design

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Limit states approach to steel design, factoring of loads and resistances, limit state

9.1.4

Analysis

Si
mply supported beams, continuous beams, pin
-
jointed trusses and frames

9.1.5

Element design

Classifications of members, design of members in axial tension, design of
members in axial compression, design of members in bending; Design
requirements for deflection a
nd shear; Design for combined bending and shear,
combined tension and shear, combined compression and shear

9.1.6

Design of structural steel work connections

Bolted connections, welded connections; Design of column base plates

9.2

Structural timber design

9.2.1

Introduc
tion

Applicable timber design code, SABS 0163

1: 1994

Natural variability in structural qualities of timber as an Engineering material

need for grading of timber; different grades of timber; criteria for the
grading (the 5% cut off point).

Orientation
of grain for timber and its effect on strength.

Modification factors for strength characteristics of timber due to:
-

-

-

-

Size effect of member

-

Moisture content

-

Pressure treatment

9.2.2

Design of structural timber members

Limit state
s criteria for design: ULS resistance vis
-
à
-
resistance vis
-
à
-

Section properties, A, I and Ze

Design of timber members in tension

Design of timber members in compression

Design of timber members in bending and shear resis
tance of timber

Deflection calculations for timber members and designing for deflection.

Design of timber members for fire

Design of connections for structural timber members

9.2.3

Computer applications in structural design of steel and timber

Use of “Prokon” a
nalysis and design programs