Faculty : Civil And EnvironmentEngineering

Page 01

Department : Structure And MaterialEngineering

Edition 2Checking No

Title :

SPACE FRAME

Effective Date 11/07/2005AmendmentDate

5/7/2005

1.0 OBJECTIVE

To varify member forces obtain from experiment with tension coefficient method

2.0 LEARNING OUTCOME

2.1 Application of theoritical engineering knowledge through practicalapplication

2.2 .To enhance the technical competency in structural engineering throughlaboratory application.

2.3 Communicate effectively in group.2.4 To identify problem, solving and finding out appropriate solution through

laboratory application.

Prepared by:Name : Ahmad Zurisman bin Mohd Ali

Signature :

Date : 10 Okt 2002

Faculty : Civil And EnvironmentEngineering

No Mukasurat 02

Department : Structure And MaterialEngineering

Edisi 2No.Semakan

Title :

SPACE FRAME

Tarikh Efektif 11/07/2005Tarikh Pindaan 5/7/2005

3.0 THEORY

If the members of a truss system is situated not in a two dimensional plane,then the truss is defined as a space frame truss. In other words, space truss hascomponents in three axis i.e. x, y and z.

Consider a member with nodeA (xA,yA) and B (xB,yB).

Y B(xB,yB)TAB

Ө

A(xA,yA)

XAssume the force in the member is TAB (+ve tension) and length LAB

Definition of tension coefficient (t), tAB = TABLAB

At A, the horizontal component TAB is:TABcosӨ = tABLABcosӨ = tABLAB (xB-XA)

LAB= tAB (xB-xA)

Used the same method , the vertical component at A is:= tAB(yB – yA)

At B, the horizontal component TAB = tAB(xA-xB)Vertical component TAB=tAB(yA-yB)Using statics, write the equation for each joint using the coordinate value andsolve for t. Convert it into force using:

TAB= tABLAB = tAB √ (xB-xA)2 + (yB-yA)2

Faculty : Civil And EnvironmentEngineering

No Mukasurat 03

Department : Structure And MaterialEngineering

Edisi 2No.Semakan

Title :

SPACE FRAME

Tarikh Efektif 11/07/2005Tarikh Pindaan 5/7/2005

4.0 PROCEDURES

Part 1:

1. Select any weight between 10 to 50 N.2. Ensure distance a = 500mm and place load hanger on D.3. Measure the distance b,c dan d and record it in Table 1.4. Record the dynamometer readings for members S1, S2 dan S3.5. Put the selected load on the hanger at D and record the6. Repeat step (2) to (4) with different value of a.7. Calculate the theoretical member forces and record it in Table 1

Part 2:

1. For part 2, use a distance of 350 mm for a.2. Place the hanger on D.3. Measure the distance b, c and d. Record the dynamometer readings

for member S1, S2 and S3 in Table 2.4. Put a load of 5N on the hanger and record the dynamometer

readings..5. Repeat step 2 to 4 using different load.6. Complete Table 2 by calculating the theoretical member value.7. Plot the graph of force against load for the theoretical and

experimental results

S2

S1

S3

a

d

b

c

D

w

x

yz

Faculty : Civil And EnvironmentEngineering

No Mukasurat 04

Department : Structure And MaterialEngineering

Edisi 2No.Semakan

Title :

SPACE FRAME

Tarikh Efektif 11/07/2005Tarikh Pindaan 5/7/2005

5.0 RESULT

1. Compare the graph of theoretical and experimental results. Comment on the

results.

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2. Gives reasons for any discrepancy in the results.

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