VULNERABILITY ASSESSMENT AND RETROFITTING TECHNIQUES
CE 76504
Course Objectives:
The course provides practical information on vulnerability assessment of existing buildings and retrofitting techniques. This course deals with vulnerability assessment of existing buildings and in this part students will learn qualitative and quantitative assessment process and will be able to carry out the qualitative assessment and concept on detail structural assessment method and analysis. The students will also learn the testing methods to estimate the properties of material on existing structures- nondestructive, semi destructive and destructive. The course deals with design technique on retrofitting and in these part students will learn design principles and various types of retrofitting technique along with construction detail. The students will be able to carry out the qualitative assessment, concept on detail analysis, testing methods and retrofitting technique.

  1. Introduction
    (3 hours)
    1. Earthquake and cause
    2. Seismic Risk
    3. Risk Reduction
    4. Building Typology in Nepal
  2. Procedure for Buildings Evaluation
    (10 hours)
    1. General background
    2. Evaluation methods
      1. Qualitative evaluation method
      2. Quantitative evaluation method
  3. Level of Seismic Protection and Seismic Risk Classes
    (4 hours)
    1. Seismic design force according to NBC and lS
  4. Performance Objectives
    (6 hours)
    1. Level of Performance
    2. Failure Mechanism
    3. Building behavior during past earthquakes
  5. Introduction on Evaluation Methodology - Simplified Method and low rise building
    (8 hours)
    1. Principle of the method
    2. Evaluation of equivalent lateral seismic forces
    3. Computation of the shear stresses in vertical elements
    4. Verification conditions
  6. Damage Assessment
    (6 hours)
    1. Non-destructive test
    2. Semi-destructive test
    3. Destructive test
  7. Retrofitting Solution and Techniques
    (8 hours)
    1. Retrofitting of reinforced concrete frame structures
      1. Interventions that do not involve the alteration of the structural system
      2. Interventions that involve the transformation of the reinforced concrete structural frames
      3. Interventions on reinforced concrete wall structures
    2. Interventions that do not involve the alteration of the structural system
      1. Interventions that involve the transformation of the reinforced concrete structural walls
    3. Interventions for masonry structures

Tutorial / Practical:

  1. Project
    1. Case study of building evaluation and retrofitting
    2. Seismic evaluation
    3. Checking of existing structure lateral stiffness
    4. Retrofitting solutions
      1. Retrofitting by reinforced concrete jacketing on the central span
      2. Retrofitting by introducing reinforced concrete shear walls
      3. Retrofitting by introducing steel braces
      4. Retrofitting by beams and columns RC jacketing
      5. Retrofitting by RC walls
      6. Retrofitting by steel bracing
  2. Determination of compressive strength of existing concrete
  3. Determination of steel bars in existing structures

References:

  1. "Assessment and Improvement of Structural Performance of Building in Earthquakes", NZSEE study Broup on Earthquake Risk building 2006
  2. "Guideline for Seismic Retrofit of Existing Reinforced Concrete Buildings", 2001, The Japan Building Disaster Prevention Association
  3. IS 1905/ SP 20
  4. IS 383, 1970
  5. IS 456, 2000
  6. Hari Darshan Shrestha et all, "Manual On Vulnerability Assessment and Retrofitting of Existing School Buildings', Prevention web
  7. NEHRP Guidelines for the Seismic Rehabilitation of Buildings, FEMA 273
  8. Nepal National Building Code (NBC) 1O9, 1994
  9. Dr B. Vidivelli, 'Rehabilitation of Concrete Structures", Standard Publisher and Distributors
  10. "Seismic Evaluation and Retrofit of Concrete Buildings, Volume 1 and 2", ATC 40
  11. "Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings', 2001, TheJapan Building Disaster Prevention Association
  12. "Technical Manual for Seismic Evaluation and Seismic Retrofit of Existing Reinforced Concrete Buildings", 2001, TheJapan Building Disaster Prevention Association

Evaluation Scheme:
The questions will cover all the chapters in the syllabus. The evaluation scheme will be as indicated in the table below:

Chapter

Hours

Marks Distribution*

1

3

5

2

10

20

3

4

5

4

6

10

5

8

15

6

6

10

7

8

15

Total

45

80

*There could be minor deviation in mark distribution.

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