1CE302: Civil and Structural Design-I A-1

Assignment 1

Roof Truss

The truss to be designed is to support a roof which is only accessible for nominal

maintenance and repair. The truss is l m span with 15 pitch. The dimensions of the

truss are shown in the figure below. All of the joints are assumed to be pinned in the

analysis and therefore only axial forces are carried by members.

15 30

A C E F

B G

D

l l l l

=

10

2CE302: Civil and Structural Design-I ST-L1

Assignment 1 cont..

The group coursework must be submitted by 4.30 p.m. on 10th April 2015 to

Mr. Chathuranga.

Check whether the proposed sizes for the top chord, bottom chord, and

selected web members are sufficient to withstand the design forces. Explain why you select the particular web members (e.g. highest forces or longest member)

If the proposed size is found to be inadequate you are not expected to carry out a further

analysis.

Select a joint (It is not necessary that the joint includes the member you

checked above) and show how the member can be connected using bolts

and welds separately.

Check the adequacy of the bolts and welds that you have proposed above.

3CE302: Civil and Structural Design-I ST-L1

Assignment 1 cont..

The assignment must contain the following information

Cover page - includes name and index numbers of members

Design data member layout, loading etc., proposed sizes

Calculations to check the adequacy of proposed sizes for selected

members

Calculation to check the adequacy of typical connection/s

Layout drawing indicating relevant information

Details of connection/s drawn to scale