Arch213Notes
20:37
ConcreteStructures: Mt.Vesuviusvolcanicash/originsofconcrete Thebasicoriginsofconcrete o FormulawaslostwiththefalloftheRomanEmpire o ThenknowledgewasregainedinEnglandwiththepatentofPortland Cementin1824 o Hydrationchemicalprocessthathar

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14
Describe and draw three types of one-way structures
Answer:
One-way arch structure - stabilized by cables
One-way prismatic truss structure - prismatic form resists rotation
One-way suspension structure - good for long spans
Assignme

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97
For the truss find max. forces in bars a and b
and select the bars of least weight (lowest cost)
b) L=100, d=10, w=1 klf
w
a
b
R
Answer:
b) L= 100, d= 10, w= 1 klf
Global moment
M= wL2/8 = 1klf (100)2/8
Bar a compression
C= M/d = 125

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78
Select and draw a building and describe its synergy of form and structure
Answer:
Chartres Cathedral, France (1194 1260)
The exterior architecture is defined by buttresses expressing the Gothic order as rich
architectural vocabulary.

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106
Using the Portal Method compute ground floor post and beam
shear and bending moment
L1=30, L2=20, h1=h2=14, F1=10 k, F2=12 k, B= 2 L1+L2= 80
Answer:
Base shear
V= F1+F2 = 10k+12k
Post a shear
Va= (L1/2)(V)/B = (15)(22k)/80
Post a be

Assignment Answers
105
Answer:
McCormick Place Chicago
Architect/Engineer: SOM
a) 45 psf
For the stayed roof find force and stress in stay cable strands A, B, C, D for
3.75 strands (70% metallic) for uniform roof load of
a) 45 psf
Strand metallic cross se

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102
Oakland Coliseum
Architect/Engineer: SOM
For the suspended roof find maximum reactions H, R, strand tension T,
stress f, and compression ring forces; assuming 2 strands, 70% metallic,
spaced 13.2 at outer compression ring
a) L= 420,

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110 Describe and illustrate a wood structure
Answer
Residence in Pacific Palisades, California
This residence features a dynamic spatial composition of stepping platforms, adapted
to a wooded uphill site with underground spri ngs. The t

Assignment Answers
104
Sea-world Pavilion Vallejo California (1994)
Architect: G G Schierle
Engineer/design/builder: ASI, Advanced Structures Inc
For the anticlastic roof find maximum mast reactions R
and require top ring diameter, assume w=20 psf total l

HW-03
Answer
For the building below of 120x66x27 high
Assume 3 shear walls of 30 length each
Allowable shear wall capacity = 800 plf
Compute the maximum base shear for
24 psf average wind load at 27-4.5 = 22.5 height
Compute wall shear q in plf
Base shear