Chap 3 Flashcards

structural design

1
Q

Direction of forces from loads acting on interior of structural members is expressed as ?

A

Stress

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2
Q

Forces within structural supports systems that resist applied loads are referred to as

A

reaction R

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3
Q

Any effect that a structure must be designed to resist like gravity, wind , earthquakes ..

A

load

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4
Q

any interaction that may change the motion of an object

A

force

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5
Q

condition of balance that exists when a structural system is capable of supporting the applied load

A

EQUILBRUIM p. 66

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6
Q

A REACTION W/IN a structural component that opposes a vertical load

A

bending Moment

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7
Q

Most common load imposed on a structure ?

A

gravity

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8
Q

Sources of vibration can include

A

Natural ( wind) , building related ( vent system ) external ( traffic )

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9
Q

what changes external to building may cause peripheral structural members to expand and contract

A

Temperature pg.67

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10
Q

Pulls material apart referred to as tensile stress

A

Tension

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11
Q

squeeze the material is referred to as

A

compression streee

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12
Q

slides one plane of material past an adjacent plane

A

shear

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13
Q

what forces often can be visually identified and evaluated

A

external forces

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14
Q

what forces must be calculated

A

Interior forces p. 68

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15
Q

load applied to CENTER of cross section of a member and perpendicular to that cross section

A

axial load

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16
Q

loads perpendicular to the cross section of the structural members , But which does not pass THROUGHT THE CENTER of the cross section

A

eccentric loads

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17
Q

loads applied OFF CENTER from the cross section of the structural compentent

A

Torsional load

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18
Q

Point at which materials causes to perform

A

failure point

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19
Q

Ratio of failure points of materials to maximum design stress `

A

factor point p. 69

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20
Q

Load types can meet multiple categories that are based on factors such as ?

A

Change over time
load application velocity
weight distribution

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21
Q

a load that is fixed in its location

A

dead load

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22
Q

loads that is not fixed or permanent

A

Live load

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23
Q

loads that are steady or applied gradually

A

static load p. 70

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24
Q

loads that involve motion ( wind, falling )

A

dynamic loads

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25
Q

For dynamic loads to stop moving, the surface it impacts must

A

absorb the kinetic energy

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26
Q

Dynamic loads may cause ?

A

structural failure

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27
Q

Rain and snow are

A

Live loads

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28
Q

ponding is

A

water accumulation. 72

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29
Q

Energy possessed by moving objects because of motion

A

kinetic

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30
Q

air pressure less than that of the surrounding atmosphere

A

negative pressure

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31
Q

water at a depth go 3 inches adds a static load of

A

21 pounds per sq ft.

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32
Q

Straight line winds apply forces to a surface is ?

A

direct pressure

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33
Q

wind flowing around the objects may catch what ?

A

drag

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34
Q

wind may produce a suction effect on the downwind side of the building resulting in outward pressure

A

negative pressure

35
Q

wind may cause the building to sway in back and fourth

A

rocking

36
Q

Wing tasing over a surface , such as a roof, may shake it is

A

vibration

37
Q

wind may dislodge or move objects from a building surface

A

clean off. 73

38
Q

Egineers must also account for complex factors such as

A

Building height , surrounding terrain and adjacent urban development

39
Q

common locations where walls may be insufficiently braced include

A

construction sites, demo sites , fire damaged buildings

40
Q

materials used in beams

A

steal , wood, reinforced concrete

41
Q

what is supported beneath both ends and free to rotate

A

simply supported beams

42
Q

rigidly supported at each end

A

restrained beam

43
Q

supported at one end , must be able to support a vertical load in addition to resisting being stresses

A

cantilever beam ( often to support balconies)

44
Q

Similar to cantilever beams but with additional support

A

overhanging beams p.79

45
Q

i beam is composed of

A

flange (top /bottom) and web( middle)

46
Q

center horizontal line of a web is known as

A

neutral axis

47
Q

stresses created within a column are

A

compressive

48
Q

materials used in columns

A

wood, steel , cast iron, concrete and masonry

49
Q

what are not primarily designed to withstand bending stresses

A

column

50
Q

tall, thin columns fail by ? / squat column fail by

A

bucking / crushing

51
Q

arches produce what at ends

A

inclined forces that ether end supports p.80

52
Q

materials used in arches

A

masonry , steel , concrete and laminated wood

53
Q

if what is removed of an arch it comes unstable

A

end supports p.81

54
Q

cables used to support loads over distance will have a

A

curved shape

55
Q

what are framed structural units made up of a group of triangles in one plane

A

trusses

56
Q

Pic of all truss

A

p.82

57
Q

Typical truss shapes span, but in modern construction may exceed

A

22-70ft/100

58
Q

connectors used with steel

A

steel gusset, rivets and welds

59
Q

connectors used with wood trusses

A

pins/bolts, gusset plates , structural adhesives , brackets and metal straps

60
Q

top of bottom longitudinal members of a truss

A

chord

61
Q

lightweight truss design noted by bow shape , or curve of top chord

A

bowstring truss

62
Q

open web truss made of steel

A

bar joist

63
Q

metal or wood plates used to connect / strengthen the joints of 2 or more separate components

A

gusset plates p.83

64
Q

3 dimensional truss

A

space frames

65
Q

what are commonly placed at exterior of a structure but they may also include internal walls

A

load bearing walls

66
Q

common materials in bearing walls

A

concrete block , brick, stone, would wood and concrete panel p. 84

67
Q

bearing walls structures use walls to support spanning elements including

A

beams , trusses , precast concrete slabs

68
Q

frame construction often referred to

A

wood frame

69
Q

historically stud wall frame has been associated with what wood studs

A

2x4 i

70
Q

internal system if structural supports w/in building

A

frame.85

71
Q

what framing uses a series of vertical element ( posts ) to support horizontal elements ( beams that carry traverse loads

A

post and beams

72
Q

structural load that experts a force perpendicular to structural members

A

transverse load

73
Q

what structural system is characterized by columns and beams reinforced to transmit the bending stresses through the joist

A

rigid frame

74
Q

material used in rigid frame

A

steal , laminate wood and reinforced concrete

75
Q

what will be the last portion of assembly to fail under fire conditions

A

joist p. 86

76
Q

broad top surface of a column or pilaster designed to spread the load held by a column

A

capital

77
Q

concrete floor in which portions of the floor above each column is dropped below the bottom level of the rest of the slab

A

drop panel

78
Q

Construction techniques using concrete slabs supported by concrete beams

A

slab and beam frame

79
Q

what system consist of an enclosing, waterproof surface

A

surface systems

80
Q

similar to fabric tents , but are permit structures

A

membrane structure

81
Q

types of membrane frames

A

cable and masts , tubular and solid.87

82
Q

other types of materials used in membrane structures

A

wood , concrete and steel

83
Q

rigid 3 dimensional structure having thin components comply made of

A

shell structures, concrete p.88