Assessment of the Bill Emerson Memorial Bridge - FTP Directory ...

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processed and analyzed for FE model validation in Section 5. Section 4 discusses the FEmodeling of the cable-stayed bridge and Section 5 investigates the sensitivity of the FEmodel to pertinent parameters and conditions and validates the model with measureddata. In Section 6, the validated FE model is applied to determine the seismic demand onvarious structural components under a design earthquake for the assessment of the cablestayedbridge. Section 7 summarizes the conclusions and recommendations derived fromthis study.8
2. Automatic Retrieval of Peak Accelerations fromReal-time Seismic Instrumentation System2.1. GeneralThis system was developed on a Java platform for viewing and extracting seismicwaveforms from the data repository via BUD (http://www.iris.washington.edu/bud_stuff/dmc/index.htm). It can be used to display the peak seismic response in agiven time span such as hourly peak acceleration.The opening screen as shown in Figure 2.1 presents a listing of Seismograms andNetwork servers grouped by institution. Scrollbars will appear as necessary to allowselecting servers which are not displayed. The column with a heading of Seismogram DClists the waveform servers. The Network DC column lists servers for station informationsuch as latitude and longitude.Figure 2.1Main screen2.2. Peak acceleration retrievalThe seismic instrumentation system will continuously record ground and structuralresponses. For design purposes, peak accelerations are more useful. Following is oneprocess to retrieve peak acceleration response every hour or other time durations.9
Page 1 and 2: Organizational Results Research Rep
Page 3 and 4: TECHNICAL REPORT DOCUMENTATION PAGE
Page 5 and 6: Executive SummaryOpen to traffic on
Page 7 and 8: 8. All cables behave elastically un
Page 9 and 10: Table of ContentsExecutive summary.
Page 11 and 12: List of Figure CaptionsFigure 1.1 A
Page 13 and 14: Figure 5.30 29 th mode shape (1.032
Page 15 and 16: 1. Introduction1.1. GeneralCable-st
Page 17 and 18: Figure 1.1Artist rendering of the B
Page 19 and 20: Expansionand lateralearthquakerestr
Page 21: 3. Evaluate the model by conducting
Page 25 and 26: 2.2.3. Map/Find stationsClicking th
Page 27 and 28: 2.2.5. Displaying seismogramsTo dis
Page 29 and 30: Figure 2.8Directory chooser2.2.6. S
Page 31 and 32: 3.2. Seismic instrumentation networ
Page 33 and 34: The main bridge from Bent 1 to Pier
Page 35 and 36: (a) South side of deck at support o
Page 37 and 38: (a) North side of deck at middle of
Page 39 and 40: The seismic responses at the top (T
Page 41 and 42: Polyreference Complex Exponential (
Page 43 and 44: are evaluated and presented in Figu
Page 45 and 46: 0.353.50.330.252.5Amplitude0.20.15A
Page 47 and 48: 1 x 10-4 Frequency(Hz)Amplitude0.90
Page 49 and 50: Amplitude0.20.180.160.140.120.10.08
Page 51 and 52: Amplitude0.20.180.160.140.120.10.08
Page 53 and 54: 1.20.80.400 100 200 300 400 500 600
Page 55 and 56: 4. Finite Element Modeling of Bill
Page 57 and 58: Since the cable stays are connected
Page 59 and 60: Table 4.3Initial property of cables
Page 61 and 62: Table 4.4Spring and damping coeffic
Page 63 and 64: (a) View of the entire bridge(b) Vi
Page 65 and 66: 4.6. RemarksA detailed 3-D FE model
Page 67 and 68: knω = (5.4)nm nSimilarly, when dam
Page 69 and 70: mainly corresponds to the vertical
Page 71 and 72: thFigure 5.10 9 mode shape (0.740Hz
Page 73 and 74:
thFigure 5.19 18 mode shape (0.947H
Page 75 and 76:
Figure 5.27 26 th mode shape (0.977
Page 77 and 78:
When the bridge deck moves up and d
Page 79 and 80:
1.1Frequency (Hz)0.90.70.5BC Case 1
Page 81 and 82:
1.1Frequency(Hz)0.90.70.5Plus 0Plus
Page 83 and 84:
no difference among the three cases
Page 85 and 86:
The FE model of the bridge was vali
Page 87 and 88:
10.6TestFE model0.2-0.20 100 200 30
Page 89 and 90:
1.20.80.40-0.4TestFE model0 100 200
Page 91 and 92:
differences is that the exact locat
Page 93 and 94:
(a) Vertical acceleration time hist
Page 95 and 96:
The FE model of the cable-stayed br
Page 97 and 98:
Displacement (m)0.30.20.10-0.1-0.2X
Page 99 and 100:
Station D1 (before amplification) a
Page 101 and 102:
ending of the tower as shown in Fig
Page 103 and 104:
symmetric about the centerline of t
Page 105 and 106:
Tensile stress (MPa)800750700650600
Page 107 and 108:
7. Conclusions and RecommendationsB
Page 109 and 110:
The vast arrays of acceleration dat
Page 111 and 112:
14. Cunha A, Caetano and Delgado T.
Page 113 and 114:
42. Song, W., Giraldo, D.F., Clayto
Page 115 and 116:
Figure A.2 Vertical stiffness and d
Page 117 and 118:
A.2 Group Interaction FactorThe cro
Page 119 and 120:
For a group of piles with identical
Page 121:
Missouri Department of Transportati
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