CE F415 Design of Prestressed Concrete Structure

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Course info

Credit: 3 Units (3-0-0).

Instructor: Dr. Md Rushdie Ibne Islam, Email: rushdie.islam@pilani.bits-pilani.ac.in, Office: 1212-A (FD-I, first floor).

Class timings:

• Lecture: Monday, Tuesday, and Thursday (9 AM - 10 AM); 1220 (FD-I, first floor)

TAs: Will be announced later.

Office hours: Either stop by instructor's office (for quick discussion) or take an email appointment (for longer discussion).

Important note: Please include CEF415 (without space) in the subject line for all email communications related to this course.

Syllabus

• Part I: Introduction and Fundamentals
  • Introduction to prestressed concrete; necessity and advantages.
  • Prestressing systems: pre-tensioning and post-tensioning.
  • Materials used: high-strength concrete and prestressing steel.
  • Types of prestressing tendons and anchorage systems.
• Part II: Stress Analysis and Prestress Losses
  • Basic assumptions in stress analysis.
  • Pressure line (thrust line) and internal resisting couple.
  • Load balancing method; stresses in tendons.
  • Types and causes of prestress losses: elastic shortening, creep, shrinkage, friction, anchorage slip.
  • Estimation of losses and numerical examples.
• Part III: Deflection, Strength, and Serviceability
  • Deflection of prestressed members – uncracked and cracked sections.
  • Crack width control and serviceability limit states.
  • Types of flexural failure; determination of flexural strength.
  • Shear resistance and design of shear reinforcement.
• Part IV: Stress Transfer and Section Design
  • Transfer of prestress in pre-tensioned members: bond and transverse tensile stress.
  • Anchorage zone stresses in post-tensioned members.
  • Design of prestressed sections for flexure.
  • Prestress limitations and limiting zones for tendon profiles.
• Part V: Design Applications and Bridge Structures
  • Codal provisions and Bennett’s chart.
  • Design of pre-tensioned and post-tensioned sections with examples.
  • Composite construction with in-situ concrete: propped/unpropped systems, shrinkage, and flexural strength.
  • Statically indeterminate prestressed structures: secondary moments, equivalent load method, concordant cables.
  • Design of post-tensioned prestressed concrete T-beam and continuous span bridges.
• Please see course handout for details.

References

• Primary
  • Raju, N.K. Prestressed Concrete.
• Additional
  • Rajagopalan, N. Prestressed Concrete.

Grading

• Quiz #1: 10%
• Mid semester exam: 25%
• Quiz #2: 10%
• Comprehensive exam: 35%
• Assignments: 10%
• Term paper: 10%

Quizzes, mid semester and comprehensive exams

• Two quizzes will be conducted; one (quiz #1) before and another (quiz #2) after the minor exam. Exact date, time and place will be notified later.
• Mid semester and comprehensive exams will be scheduled based on the institute timetable.

Homework

• Homework will be assigned almost every week. These will not be graded. Hence, submission is not necessary.
• Students are strongly encouraged to try the homework problems.

Make-up policy

• If the student is unable to appear for the Regular Test/Examination due to genuine exigencies, the student must refer to the procedure for applying for Make-up Test/Examination. No make up for the assignments.
• Academic honesty and integrity are to be maintained by all the students throughout the semester and no type of academic dishonesty is acceptable.