Deck 32: Exterior Wall Cladding-Iv Wall System in Glass

Question 1

The width of an expansion joint between adjacent mullion lengths in a typical stick- built glass curtain wall

A)is generally 1/2 in. standard.
B)is generally 1 in. standard.
C)is generally 1/16 in. standard.
D)is generally 1/4 in. standard.
E)must be determined on a project- by- project basis.

Answer 1

E

Question 2

A glass curtain wall in which the glass is pressure plate captured is glazed from the

A)building's exterior.
B)building's interior.
C)A or B.

Answer 2

A

Question 3

The width of an expansion joint in the rails of a typical stick- built glass curtain wall

A)is 1 in. standard.
B)is 1/4 in. standard.
C)is 1/32 in. standard.
D)is 1/2 in. standard.
E)must be determined on project- by- project basis.

Answer 3

C

Question 4

A stick- built glass curtain wall consists of

A)rails and glass.
B)preassembled units and glass.
C)mullions, rails, and glass.
D)mullions and glass.
E)mullions, rails, and preassembled units.

Question 5

A stick- built glass curtain wall is anchored to the building's structure through

A)rails.
B)mullions.
C)both mullions and rails.
D)none of the above.

Question 6

In a stick- built glass curtain wall, the mullions are typically spaced at

A)10 ft to 15 ft on center.
B)6 ft to 10 ft on center.
C)2 ft to 4 ft on center.
D)4 ft to 6 ft on center.
E)as needed for the project.

Question 7

In a stick- built glass curtain wall, the rails are typically spaced at

A)4 ft to 6 ft o.c.
B)2 ft to 4 ft o.c.
C)6 ft to 10 ft o.c.
D)10 ft to 15 ft o.c.
E)as needed for the project.

Question 8

In a single- span mullion system for a glass curtain wall,

A)one dead- load anchor is provided at every floor level.
B)two dead- load anchors are provided at every floor level.
C)one dead- load anchor is provided at every alternate floor level.
D)only one dead- load anchor is provided for the entire height of the wall.
E)two dead- load anchors are provided at every alternate floor level.

Question 9

A typical glass curtain wall is provided with weep holes to drain infiltrating water even though it is sealed from both the inside and the outside with gaskets or tapes.

Question 10

A shear block is used

A)at a mullion expansion joint to allow the mullion to move.
B)at the dead- load anchor of a mullion.
C)to connect a rail to adjacent mullions.
D)at the expansion anchor of a mullion.
E)none of the above.

Question 11

In a twin- span mullion system for a glass curtain wall,

A)one expansion anchor is provided at every alternate floor level.
B)two expansion anchors are provided at every alternate floor level.
C)only one expansion anchor is provided for the entire height of the wall.
D)one expansion anchor is provided at every floor level.
E)two expansion anchors are provided at every floor level.

Question 12

As shown in this text, a glass curtain wall in which the glass is structural silicone adhered is glazed from the

A)building's interior.
B)building's exterior.
C)A or B.

Question 13

In a single- span mullion system for a glass curtain wall,

A)two expansion anchors are provided at every alternate floor level.
B)one expansion anchor is provided at every alternate floor level.
C)only one expansion anchor is provided for the entire height of the wall.
D)one expansion anchor is provided at every floor level.
E)two expansion anchors are provided at every floor level.

Question 14

Glass curtain walls in which aluminum framing sections are specially profiled for a particular project are

A)rare because of the prohibitive cost of manufacturing custom profiles.
B)uncommon because of the extremely high cost of manufacturing custom profiles.
C)fairly common because the cost of custom profiles can be recovered from one large project.
D)not uncommon because the cost of custom profiles can be recovered from a few repeat mid- sized to large projects.

Question 15

In a glass curtain wall with pressure plate- captured glass, there are

A)no covers.
B)covers only in the vertical direction.
C)covers only in the horizontal direction.
D)covers in both horizontal and vertical directions.

Question 16

The air infiltration rate through a glass curtain wall is specified in terms of

A)cubic feet per minute.
B)pounds per square feet.
C)cubic feet under a given inside- outside air pressure difference.
D)cubic feet per minute under a given inside- outside air pressure difference.
E)none of the above.

Question 17

As shown in the text, a glass curtain wall with structural silicone- adhered glass

A)has no exterior covers.
B)has exterior covers only in the horizontal direction.
C)has exterior covers only in the vertical direction.
D)has exterior covers in both horizontal and vertical directions.

Question 18

A unitized glass curtain wall consists of

A)mullions, rails, and glass.
B)mullions and glass.
C)mullions, rails, and preassembled units.
D)preassembled units and glass.
E)rails and glass.

Question 19

In a twin- span mullion system for a glass curtain wall,

A)only one dead- load anchor is provided for the entire height of the wall.
B)one dead- load anchor is provided at every floor level.
C)one dead- load anchor is provided at every alternate floor level.
D)two dead- load anchors are provided at every alternate floor level.
E)two dead- load anchors are provided at every floor level.

Question 20

In a stick- built glass curtain wall, the mullions are erected first and the rails are inserted between them.

Question 21

The underlying sketch shows components of a glass- aluminum curtain wall. Using leader lines and labels, ident the following components: (i)vision glass, (ii)spandrel glass, (iii)vertical and horizontal pressure plates, and (iv and horizontal covers. How are the covers anchored to mullions and rails?

Question 22

A stick- built glass- aluminum curtain wall system consists of horizontal and vertical framing members. What are they called in curtain wall vocabulary? Are their cross- sectional profiles the same or different?

Question 23

In a cable- net- supported glass wall, the glass

A)is connected to (vertical)mullions.
B)bears on (horizontal)rails.
C)both A and B above.
D)is supported by a spider- shaped connector.
E)none of the above.

Question 24

In a stick- built glass curtain wall system, the mullions may span floor to floor (called single- span mullion system)or between two floors (called twin- span mullion system). In the single- span mullion system, each mullion must be anchored to the building's structural frame with two supports, one at each end. What are these supports (anchors)called? Which of these two anchors (supports)is designed to: (i)carry the gravity load of the curtain wall, (ii)accommodate movement in the curtain wall, and (iii)resist the lateral (wind and seismic)load on the curtain wall?

Question 25

The environmental performance requirements for a storefront are generally much higher than those for a glass curtain wall.

Question 26

In a glass wall supported by cable trusses, the glass

A)is connected to (vertical)mullions.
B)bears on (horizontal)rails.
C)A and B.
D)none of the above.

Question 27

A stick- built glass- aluminum curtain wall system consists of mullions and rails. What is the typical center- to- center spacing between mullions?

Question 28

The underlying sketch shows a typical connection between a mullion and rail in a stick- built curtain wall. Using leader line and label, identify: (i)shear block and (ii)bottom cover of rail. Explain how the bottom cover is attach top part of the rail.

Question 29

The two most commonly used glass- aluminum curtain wall systems are the stick- built system and the unitized system. Which of these requires less site- installation time and which has lower transportation cost in delivering the system's materials to the site?

Question 30

Because the glass- aluminum curtain wall is exposed to the outside environment, thermal expansion and contraction must be taken into account in the design of the wall. In a stick- built curtain wall, are the movement joints (called expansion joints)provided in both rails and mullions? If provided in only one of the two members, which one and why?

Question 31

The underlying sketch shows a detailed horizontal section through a curtain wall. Using leader lines and labels, identify various components of the curtain wall. Also explain how the glass is held in position.

Question 32

A stick- built glass- aluminum curtain wall system consists of horizontal and vertical framing members, called rails and mullions respectively. In anchoring them to the building's structural frame, which of these (rails or mullions)are installed first? Are the members that are installed second also anchored directly to the building's structural frame?

Question 33

In a stick- built glass curtain wall system, the mullions may span floor to floor (called single- span mullion system)or between two floors (called twin- span mullion system). In the twin- span mullion system, how many dead load support anchors and how many tieback (expansion anchor)supports are provided in each mullion?

Question 34

The two most commonly used glass- aluminum curtain wall systems are the stick- built system and the unitized system. What system is a combination of these two systems?

Question 35

In connecting the rails to mullions, a shear block is attached to the mullion at each end of the rail. In this connection, is the rail made of one piece or two pieces?

Question 36

A stick- built glass- aluminum curtain wall system consists of mullions and rails. How many rails are used over the height of one floor in a typical office building?

Question 37

The underlying sketch shows two vertical full- length pressure plates and one small piece of pressure plate on the left- hand side of the vertical pressure plate. What is the purpose of the small- piece pressure plate?

Question 38

The two most commonly used glass- aluminum curtain wall systems are the stick- built system and the unitized system. Which of these provides greater field adjustment possibilities, required to compensate for minor imperfections in a building's structural framing system?

Question 39

Expansion joints are provided in the mullions of a glass- aluminum curtain walls. Is the width of these joints determined based only on thermal expansion and contraction of mullions? Explain.

Question 40

In a stick- built glass curtain wall system, the mullions may span floor to floor (called single- span mullion system)or between two floors (called twin- span mullion system). In the single- span mullion system, each mullion is provided with a dead load anchor and a tieback. In this support system, which anchor (dead load anchor or tieback)is provided at the top of each mullion?

Question 41

Sketch in three dimensions a typical spider- shaped connector.

Question 42

List the major differences between a glass curtain wall and a storefront.

Question 43

Use three- dimensional sketches to illustrate each of the following:
a. A typical dead- load anchor used in a glass curtain wall
b. A typical expansion anchor used in a glass curtain wall

Question 44

Using sketches and notes, explain how we increase the lateral load- bearing capacity of a standard glass- aluminum wall.

Question 45

Explain the purpose of the following items and state where they are used: (a)shear block, (b)pressure plate, and (c)adapter for spandrel glass.

Question 46

In a high- rise glass- aluminum curtain wall, the wind pressures increase with height. With increasing wind pressure, the size of mullions must increase with height. However, aesthetic and detailing considerations require the same size of mullions over the entire building's height. How is this requirement generally met?

Question 47

The underlying sketch shows a detailed vertical section through a pressure- plate captured glass- aluminum curtain wall. Using leader lines and labels, identify the following elements in the section: (i)ceiling, (ii)insulatio interior floor slab, (iv)rail (v)aluminum stool at sill level.

Question 48

Using sketches and notes, explain the differences between a single- span mullion support system and a twin- span mullion support system for a glass curtain wall.

Question 49

The underlying sketch shows a detailed vertical section through a pressure- plate captured glass- aluminum curtain wall. Identify the fire containment assembly in the sketch, its purpose and what it consists of.