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NDT Application in Structural Integrity Evaluation of Bomb Blast Affected Buildings

PRESENTED BY: ENG. J.K CHEGE
CO-AUTHOR ENG.N .MATALANGA.
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ABSTRACT.

1. INTRODUCTION.

2. DESCRIPTION OF THE BUILDING

3. THE BOMB BLAST

4. INSPECTION OF STRUCTURAL DEFECTS

5. TEST RESULTS.

6. EVALUATION OF TEST RESULTS.

OBSERVATIONS RECOMMENDED TESTING REMARKS
(a) Timber decking at A-B/5-6.
  • Rafters for timber decking perpendicular to wall A/4-5 crushed.
  • Connection of universal beam to wall A/4-5 failed.
(b) Shear walls
  • A/2-3 - Several vertical cracks..
  • A/4-5 - Wall is heavily cracked.
  • 1 big diagonal crack on the outside and reinforcement exposed
  • 3/A-F&4/A-F - Crack at opening in wall between B-C &D-E.
  • 3/A-B - Several diagonal .racks
  • 4/A-B -3 vertical cracks.
  • 3/E-F - Two cracks, vertical & diagonal.
  • 4/E-F - 1 vertical crack.
Use GPR and UT equipment to confirm length, depth and width of cracks. Map out the extent of damage of Wall A/4-5 at Mezzanine 1,2 and 1st floor.
Mezzanine 2: VISUAL INSPECTION.

CONCLUSION.

REFERENCES:

  1. The structural assessment of buildings subjected to bomb damage, Rhodes PS structural Engineer / Volume 52/
  2. No. 9 1974.
  3. The structural Engineers response to explosion damage, Institution of structural Engineers London November 1995.
  4. An Ultrasonic method of studying, determination and cracking in concrete structures. - Leslie Jr k Cheesman Wj.
  5. Simulation and imaging of GPR data scattered by reinforcing bars in concrete bridge. Deck B.Sudormo et al, JEE G, v.l No. 3 Dec. 1996.
  6. Sensor & Software OKKO update January 1997.
  7. Co-operative Bank House NDT of structural elements Report, Quality Inspectors Ltd. Nairobi 1999.
  8. BS 1881 Recommendations on use of Electro Magnetic Covermetres.
  9. BS 4408 Recommendations for Non - Destructive testing of Concrete.

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