Download the thesis (PDF) - Ferguson Structural Engineering ...

More documents

Recommendations

Info

CHAPTER 1INTRODUCTION1.1 BACKGROUNDIt is a well-known fact that the condition of the nations’ bridges is poor atbest. Surveys have revealed that up to 40% of the bridges currently in service areeither structurally or geometrically deficient, [Ref. 5.9]. As an alternative todestroying inadequate bridges, a common solution involves rehabilitating theexisting structure. The Texas Department of Transportation (TxDOT) isresponsible for deciding whether replacement or rehabilitation is the best optionfor each bridge structure. This process is complicated when the bridge inquestion is historic in nature. In response to the growing interest of the historicalcommunity in the preservation of Texas’ older metal truss bridges, TxDOT hasbeen addressing each historic bridge rehabilitation on a case-by-case basis. Theofficials at TxDOT, wishing to formulate sound engineering decisions, as well asmaintain the existing historic truss bridges of the state, commissioned TheUniversity of Texas at Austin to aid in the resolution of these difficulties.1.2 PROJECT DESCRIPTIONThe overall objective of this project is to maintain the historic metal trussbridges of Texas in continued vehicular service. The University of Texas atAustin had been commissioned by TxDOT to produce guidelines that will aid theTexas officials in the repair and rehabilitation of historic metal truss bridges. The1
esearchers have identified tasks, which are presently being completed, to aid inthe compilation of these guidelines. There are three steps of this research project,the first of which being a review and documentation of current rehabilitationtechniques of other Departments of Transportation (DOTs) and an in-depthliterature review of repair techniques. The second task is the examination of twocase-study bridges. This examination will include the load testing and evaluationof possible retrofit options to strengthen the bridges. A third investigation willinvolve laboratory testing of repair and retrofit techniques as applied to bridgemembers. At the completion of this project, the researchers will produce athorough compilation of strategies that will aid the TxDOT officials in preservingthe historic metal truss bridges of Texas in vehicular service.1.3 SCOPE OF REPORTThis research report represents the completion of the first task identifiedabove. To successfully carry out this step, the task was separated into threesegments. The first step was a survey of DOTs to investigate the current level ofrehabilitation undertaken by other agencies.The second step involvedassembling a collection of articles and documents related to truss bridgerehabilitation. Thirdly, the elements from the first two steps are condensed toprovide a summary of current rehabilitation techniques, supported with relevantliterature and the experiences of other transportation officials. In the followingparagraphs, a short introduction to each of these segments will be provided.2
Page 1 and 2: Preservation Alternatives for Histo
Page 3 and 4: DedicationTo my parents, Russell an
Page 5 and 6: AbstractPreservation Alternatives f
Page 7 and 8: 3.2.1 Survey Overview .............
Page 9 and 10: Question 7: .......................
Page 11 and 12: LIST OF FIGURESFigure 3.1: Response
Page 13: xiii
Page 17: 1.3.3 Summary of Literature Review
Page 20 and 21: 2.2 METHODOLOGYThe methodology used
Page 22 and 23: 3. Superimposed Truss4. Coverplatin
Page 24 and 25: the University of Texas at Austin,
Page 26: in the previous section, including
Page 29 and 30: 3.2.1 Survey OverviewThe two compon
Page 31 and 32: 3.3.1 Question 1Has your state deve
Page 33 and 34: 3.3.3 Question 3Have you used advan
Page 35 and 36: 3.3.5 Question 5What are the most c
Page 37 and 38: members are understrength. By utili
Page 39 and 40: None13%ConcreteBarrier9%Other26%W-B
Page 41: contacted.From these follow-up call
Page 45: 5.2 RECOMMENDATIONS FOR FUTURE INVE
Page 48 and 49: INTRODUCTORY INFORMATION [1.2]Nicho
Page 50 and 51: INTRODUCTORY INFORMATION [1.6]Licht
Page 52 and 53: Rehabilitation TechniquesGENERAL [2
Page 54 and 55: This article describes a structural
Page 56 and 57: POST-TENSIONING [2.2.3]Ayyub, Bilal
Page 58 and 59: A572-50 steel were added to the old
Page 60 and 61: To increase the portal rigidity of
Page 62 and 63: sponsored by the Structural Divisio
Page 64 and 65:
Tension rods were attached to the t
Page 66 and 67:
is a conservative designation for r
Page 68 and 69:
A truss bridge built in 1926-27 con
Page 70 and 71:
hanger type connection. The pins on
Page 72 and 73:
This handbook provides an overview
Page 74 and 75:
This technical brief outlines the a
Page 76 and 77:
crossing the Charles River was dama
Page 78 and 79:
for inspection procedures in the fu
Page 80 and 81:
model and 3-D model were both used.
Page 82 and 83:
In this article, the authors discus
Page 84 and 85:
to derive equations for partially e
Page 86 and 87:
Maximum forces due to uniform lane
Page 88 and 89:
This article investigate the contri
Page 90 and 91:
described along with the necessary
Page 92 and 93:
RELIABILITY ANALYSIS [3.6.3]Frangop
Page 94 and 95:
STRUCTURE [4.1.3]Aktan, A. E., K. L
Page 96 and 97:
modified from published values usin
Page 98 and 99:
case, the pin ended calculation pro
Page 100 and 101:
The bridge was instrumented and a s
Page 102 and 103:
MEMBERS [4.2.2]Schindler, Hans-Jako
Page 104:
MEMBERS [4.2.4]Keating, Peter B., J
Page 107 and 108:
double splices with different stres
Page 109 and 110:
References : Virginia Highway and T
Page 111 and 112:
ehabilitation project. The Steel St
Page 113 and 114:
Board, National Cooperative Highway
Page 116 and 117:
APPENDIX ASURVEY OF DEPARTMENTS OF
Page 118 and 119:
Preservation of Historic Metal Trus
Page 121 and 122:
4. Have you used load testing to as
Page 124 and 125:
8. What methods, if any, have you u
Page 126:
12. Additional Comments:13. Please
Page 129 and 130:
MD : We haven’t developed any off
Page 131 and 132:
Yes:MD: We used load testing to eva
Page 133 and 134:
TN: Replace members. Add section to
Page 135 and 136:
Widening bridge: AZ, [NE (tested in
Page 137 and 138:
SK: We do not have any historic met
Page 139 and 140:
• We replaced the deck of bridge
Page 141 and 142:
• Reuse the floorbeams by bolting
show all

Download the thesis (PDF) - Ferguson Structural Engineering ...

Create successful ePaper yourself

Delete template?

Save as template?