Unit 1.- Technological Process

Practical example: BRIDGES

I.E.S. SANTA ROSA DE LIMA

TECNOLOGÍA 2º ESO

1. Identify the problem or necessity.

2. Search for information.

3. Design and construction.

4. Evaluation of what have been constructed.

Steps of technological process

Problem: Cross a river from one side to the other side

1.- Identify the problem

Additional problems:

◦ ¿Is it too deep to cross by feet?

◦ ¿Is there too much water stream or cold temperature to cross swimming?

1.- Identify the problem

Possible Solutions:

a) A boat or canoe b) A bridge

2.- Search for information

We look for information about different kind of bridges:

2.- Search for information

Girder bridge

Rope Bridge

Arc bridgeTriangulate

bridge

We look for information about different kind of bridges:

2.- Search for information

Cable-stayed bridge

Suspension Bridge

Drawing the plans (CAD tools):

3.- Design and Construction

Simulation tests (CAE tools):

3.- Design and Construction

Construction planning:

3.- Design and Construction

Load tests:

4.- Evaluation

Static test Dynamic Test

Tacoma Narrows Bridge

Tacoma Narrows Bridge First design by Clark Eldridge (11$ million).

Another design, by Leon Moisseiff, was chosen, reducing the total cost (8$ million).

Features:

◦ Total length of 1600 metres.

◦ Main span of 853 metres.

◦ The first one built using plate girders.

◦ Collapsed four months after its opening.VIDEO

Tacoma Narrows Bridge After its collapse, the new Tacoma

Narrows Bridge, built in 1950, replaced plate girders by adding trusses.

In 2007 it was open to the traffic new Tacoma Narrows Bridge.

Tacoma Narrows Bridge