Bridge Design Bartlett

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THE UNIVERSITY OF WESTERN ONTARIO

FACULTY OF ENGINEERING

DEPARTMENT OF CIVIL and ENVIRONMENTAL ENGINEERING

ES679b BRIDGE DESIGN & EVALUATION

Winter 2005/06

OBJECTIVES: The objectives of this course are for the student to become able to:

1. recognise that design criteria in current Bridge Design Standards, that pertain to the

behaviour, design and assessment of bridges, are simple applications of the

fundamentals of statics, applied mechanics, and reliability theory;

2. document decisions made during the design and evaluation process in coherent and

legible design calculations;

3. idealise bridge structures for analysis;

4. develop practical bridge design and evaluation skills; and

5. enhance critical thinking skills

PREREQUISITES: NONE.

CO-REQUISITES: NONE.

ANTIREQUISITES: NONE.

CONTACT HOURS: 3 lecture hours/week (personal study - 9 hours).

INSTRUCTOR: Dr. F. M. Bartlett, P. Eng., SEB3027, email: [email protected]

Secretary: Cindy Quintus, SEB3005

TEXT: NONE.

LECTURE NOTES: It is strongly recommended that prepared lecture notes be brought to each lecture.

REFERENCES: CSA Standard CAN/CSA-S6-00, Canadian Highway Bridge Design Code and

Commentary, 2000. (Copy in Civil Engineering 441 design room)

Bridge Deck Behaviour by Hambly, E.C., Chapman and Hall, 2nd Edition, 1991.

COMPUTING: Assignments may require the use of computer programs such as PCBRIDGE or SAP

2000.

LABORATORY: There is no formal laboratory component of this course. However, one of the

assignments will include the inspection and evaluation of a bridge in the London

area.

UNITS: SI units will be used in lectures and examinations. Drawings of existing bridges

may be in Imperial units.

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SPECIFIC LEARNING

OBJECTIVES:1. Bridges and Bridge Aesthetics: At the end of this segment, the student should be

able to:

a) Readily identify different bridge types, span or support arrangements and types

of cross section.

b) Know and be able to apply principles of bridge aesthetics.

2. Bridge Gravity Loads and Load Effects:

a) Account for method of construction in determining dead load effects.

b) Distinguish between traffic load models designed to simulate the actual vehicle

and those designed to simulate the load effect caused by the vehicle.

c) Distinguish between, and be able to manipulate, event and extreme value

probability distributions.d) Efficiently determine maximum live load force effects using influence lines,

closed-form methods for simple spans, and computer analyses.

e) Efficiently compute the transverse distribution of live load effects for determinate

systems using statics or for indeterminate systems using the simplified methods in

the CHBDC or sophisticated methods.

f) Understand the rationale for, and be able to implement, methods to simplify the

idealization of the structure for analysis.

g) Determine the dynamic load allowance and maximum permissible deflection

based on the first flexural frequency of the structure.

3. Thermal Loads and Movements, and Load Effects due to Restraint of Movements:

a) Determine design temperature ranges and compute the magnitude and directionof associated displacements at supports.

b) Determine design thermal gradients and compute stresses and reactions due to

the primary and secondary effects of such gradients.

4. Design Code Formats and Code Calibration:

a) Distinguish between and recognize the advantages and weaknesses of Working

Stress Design, Limit States Design.

b) Distinguish between the various limit states in Limit States Design.

c) Derive the reliability index for linear limit states functions defined by normal or

lognormal load and resistance distributions, or using the first-order second-moment

reliability index for non-linear limit states functions.

d) Compute load and resistance factors using separation factors or methods basedon the first-order second-moment reliability index.

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5. Existing Bridge Evaluation:

a) Recognize the impact of increased traffic loads, deterioration and changes to

design criteria on the deficiency of aging bridge stock.

b) Determine target reliability indices for existing bridge evaluation based onfactors that increase the warning of failure.

c) Evaluate members of an existing bridge using the load and resistance factor

based method.

d) Critically review the advantages and disadvantages of evaluation based on full-

scale load testing.

6. Material Properties for Existing Bridge Evaluation:

a) Distinguish between the nominal and actual strengths of construction materials,

and their impact on reliability assessment.

b) Determine material properties of structural steel, concrete, and reinforcing steel

for evaluation in accordance with CHBDC criteria based on original construction

plans and documents, analysis of tests of samples, or the original construction dateof the bridge.

c) Account for data collected during a condition inspection in the assessment of

material properties and member resistances.

EVALUATION: Final Examination* 50%

Readings 10%

Assignments 40%

Total 100%

* Students must pass the final examination to pass this course. (Students who fail

the final examination will be assigned the aggregate mark or 58%, whichever is

smaller).

READINGS: On the day of the final examination, each student must turn in a critique of at least

eight (8) papers that pertain to the material covered in the course. Suitable readings

will be suggested from time to time during the lectures, however students are

encouraged to find other relevant papers to critique as well. Grading will be based

on the topics selected, the completeness of the reference (Author, title, journal

name, volume number, issue number, month, page citations), and the quality of the

summary or critique of each paper. The critiques may be in point form or in essay

form, but, in either case, satisfactory use of English is required. To expedite the

evaluation process, please indicate which four (4) critiques you feel are the most

effective.

ASSIGNMENTS: Four or five assignments will be circulated during the term some may appear in

more than one part. Assignments should be turned in to Ms Quintus in the CEE

office, who will put them in my mailbox. The penalty for late submission is

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10% per working day late if you need an extension, please indicate this in an

email message before the assignment is due. To expedite the evaluation process,

students are permitted to submit assignments in teams of two, however any

assignment submitted by a team must meet a higher standard of completeness,neatness, accuracy and use of English than that submitted by a single individual.

ENGLISH: In accordance with Senate and Faculty Policy, students may be penalised up to 10%

of the marks on all assignments, tests and examinations for the improper use of

English. Additionally, poorly written work with the exception of final

examinations may be returned without grading. If resubmission of the work is

permitted, it may be graded with marks deducted for poor English and/or late

submission.

CONSULTATION: Students are encouraged to discuss problems with the instructor at the end of the

lecture. Other individual consultations can be arranged by appointment.

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Bridge Design Bartlett