Chater 1; Unit 1

Question 1

What is a frame structure (4)

Answer 1

• open structures
• not solid
• mase of different parts called members

Question 2

What is anther word for a frame structure

Answer 2

Some frame structures called trusses

Question 4

What is a roof truss (1)

Answer 4

A structure that supports a buildings roof

Question 5

What is a roof truss made of (2)

Answer 5

Wood or steel

Question 6

What is the span? (1)

Answer 6

The distance between the walls supporting the truss

Question 7

What makes the roof truss memebers different (3)

Answer 7

Their length, positions and functions

Question 8

What is a rafter (1)

Answer 8

A sturdy memeber on which the roof is fixed to the truss

Question 9

What is the king post (2)

Answer 9

• It supports the top end of the rafter

- The angle of tge roof to horizontal is the pinch (usually 30°)

Question 10

What is the queen post (1)

Answer 10

Used on trusses with a long span to support the rafter

Question 11

What are wall plates (1)

Answer 11

They rest on the tie beams, placed on the walls

Question 12

What is the tie beam (3)

Answer 12

Its used to fasten the bottom ends of the rafter on 1 side to the other

To prevent collapsing

The king and queen posts support

Question 13

What does “exerted on a member” mean (1)

Answer 13

Acted on a member

Question 14

Name the 4 different forces (4)

Answer 14

• tension
• compression
• shear
• tension

Question 15

Discuss tension force (2)

Answer 15

• also called tensile force

- pulls on a meber by stretching

Question 16

What is a member in tension called (1)

Answer 16

Tie

Question 17

Discuss compression (2)

Answer 17

• also called compressive force

- presses on a member by squashing

Question 18

What is a member in compression called (1)

Answer 18

Strut

Question 19

Discuss shear force (3)

Answer 19

• tends to cut a member
• e.g. scissors cutting paper
• opposite forces acting on a memeber

Question 20

What is tension force (1)

Answer 20

It twists a member