Response of Steel MRF to Puente Hills simulated motions

1
Response of Steel MRF to Puente Hills simulated
motions

• Anna Olsen
• Tom Heaton
• Dean John Hall
• Caltech Civil Engineering

2
Model 20 story steel moment-frame building

• 20 story steel moment-frame building plus one
  basement.
• Designed according to the 1994 UBC
• Natural period is 3.5 sec
• H77.88 m

Frame Elevation
Floor Plan
3
20-story SMRF
4
6-story SMRF (1.54 sec period)
5
Faults Modeled
Day and others, 2005

• 1. Sierra Madre (7.0)
• 2. Santa Monica SW (6.3)
• 3. Hollywood (6.4)
• 4. Raymond (6.6)
• 5. Puente Hills I (6.8)
• 6. Puente Hills II (6.7)
• 7. Puente Hills (all) (7.1)
• 8. Compton (6.9)
• 9. Newport-Inglewood (6.9)
• 10. Whittier (6.7)

6
Coordination Scheme
UCB -LLNL UCSB CMU URS (RG) URS (AP)
S. Madre F,R,S C
S. Mon. F,R C
HollyW F,R C
Raym F,R C
P.Hills6.8 F,R C
P.Hills6.7 F,R C
P.Hills7.1 F,R,R,S C
Comp F,R,S C
N-I N. R,S F C
Whit N. R F C
R 1D rock reference simulation S 1D
basin-profile simulation
F 6 3D scenarios C single cross-check
7
Puente Hills M 7.1
8
Puente Hills M 7.1 (2sec. Bandpass)
9
Downtown LA site for M 7.1 Puente Hills
DLA
10
Puente Hills (M7.1) LA downtown 6-story with
perfect welds
11
Puente Hills (M7.1) LA downtown 6-story with
brittle welds
12
Puente Hills (M7.1) LA downtown 20-story with
perfect welds
13
Puente Hills (M7.1) LA downtown 20-story with
brittle welds
14
Mid-city site for M 7.1 Puente Hills
MC
15
Puente Hills (M7.1) mid-city 6-story with
perfect welds
16
Puente Hills (M7.1) mid-city 6-story with
brittle welds
17
Puente Hills (M7.1) mid-city 20-story with
perfect welds
18
Puente Hills (M7.1) mid-city 20-story with
brittle welds
19
West LA site for M 7.1 Puente Hills
WLA
20
Puente Hills (M7.1) West LA 6-story with perfect
welds
21
Puente Hills (M7.1) West LA 6-story with brittle
welds
22
Puente Hills (M7.1) West LA 20-story with
perfect welds
23
Puente Hills (M7.1) West LA 20-story with
brittle welds
24
Puente Hills M 7.1 6-story with perfect welds
25
Puente Hills M 7.1 6-story with brittle welds
26
Puente Hills M 7.1 20-story with perfect welds
27
Puente Hills M 7.1 20-story with brittle welds
28
Graves
29
Comparison of Graves motions vs SCEC motions for
downtown LA
30
Comparison of Graves motions vs SCEC motions for
Whittier
31
Graves scenario and 6-story with perfect welds
32
Graves scenario and 6-story with brittle welds
33
Graves scenario and 20-story with perfect welds
34
Graves scenario and 20-story with brittle welds
35
Are We Addressing the Right Questions in
Earthquake Engineering?

• Current methodology assumes 1) architecture and
  2) seismic hazard.
• Simplified assumptions about nonlinear building
  response (ductility factors) are used to produce
  a design.
• collapse mechanisms are rarely defined.
• Earth scientists are almost never asked if it is
  possible that the site will experience motions
  that can trigger the collapse mechanisms.
• Choose designs that are least susceptible to
  poorly predicted ground motions.
• Its really tough to predict fault slip and hence
  long-period ground motions.

36
(No Transcript)
37
Graves
38
Graves
39
Puente Hills (East segment, M 6.8,epi 2)
SCEC/PEER
40
Puente Hills (East segment, M 6.8,epi 2)
SCEC/PEER
41
Puente Hills (East segment, M 6.8) SCEC/PEER
slip models
42
Puente Hills (East segment, M 6.8)6-story with
brittle welds
43
Puente Hills (East segment, M 6.8)6-story with
brittle welds
44
Puente Hills (East segment, M 6.8)6-story with
perfect welds
45
Puente Hills (East segment, M 6.8)6-story with
perfect welds
46
Puente Hills (East segment, M 6.8)20-story with
brittle welds
47
Puente Hills (East segment, M 6.8)20-story with
brittle welds
48
Puente Hills (East segment, M 6.8)20-story with
perfect welds
49
Puente Hills (East segment, M 6.8)20-story with
perfect welds
50
Puente Hills LA Segment (M 6.7)
51
Puente Hills LA Segment (M 6.7)
52
Puente Hills LA Segment (M 6.7)Slip
53
Puente Hills LA Segment (M 6.7) 6-story with
brittle welds
54
Puente Hills LA Segment (M 6.7) 6-story with
brittle welds
55
Puente Hills LA Segment (M 6.7) 6-story with
perfect welds
56
Puente Hills LA Segment (M 6.7) 6-story with
perfect welds
57
Puente Hills LA Segment (M 6.7) 20-story with
brittle welds
58
Puente Hills LA Segment (M 6.7) 20-story with
brittle welds
59
Puente Hills LA Segment (M 6.7) 20-story with
perfect welds
60
Puente Hills LA Segment (M 6.7) 20-story with
perfect welds
61
Puente Hills M 7.1
62
Puente Hills M 7.1 6-story with brittle welds
63
Puente Hills M 7.1 6-story with perfect welds
64
Puente Hills M 7.1 20-story with brittle welds
65
Puente Hills M 7.1 20-story with perfect welds
66
Graves downtown site 1 20-story with brittle welds
67
Graves downtown site 2 20-story with brittle welds
68
Graves downtown site 3 20-story with brittle welds
69
Graves downtown site 4 20-story with brittle welds
70
Graves downtown site 5 20-story with brittle welds
71
Graves downtown site 6 20-story with brittle welds
72
Graves downtown site 7 20-story with brittle welds
73
Graves downtown site 8 20-story with brittle welds
74
Graves downtown site 9 20-story with brittle welds