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Welcome to HRC Bagh

Welcome to HRC Bagh. Workshop on Safer Building Through Improving Steel Detailing. Objective. To understand the recommended practices with reference to earthquake resistant techniques to make their houses safe; To improve steel detailing in in building construction;

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Welcome to HRC Bagh

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  1. Welcome to HRC Bagh Workshop on Safer Building Through Improving Steel Detailing

  2. Objective • To understand the recommended practices with reference to earthquake resistant techniques to make their houses safe; • To improve steel detailing in in building construction; • To sensitize the stakeholders to adopt earthquake safer techniques; • To ensure the effective technology transfer to the target groups.

  3. WELCOME Bagh Seismic zone

  4. Destruction In Earthquake

  5. RC Frame Buildings DHQH Bagh 7

  6. RC Frame Buildings 8

  7. RC Frame Buildings Margalla Tower 9

  8. Earthquake 2005 Ring Spacing

  9. Ring Problem

  10. Our Practice?

  11. Spacing of Stirrups Effects

  12. Common Practice New

  13. Recommended Spacing Ring Spacing= 4″

  14. Recommended Shape of Seismic Stirrup Such stirrups do not open even during strong shaking 3″ 135°

  15. Column “L” AND Base

  16. Deficient Length of “L”

  17. Proper Column Base “L” Should be= 12 inch 19

  18. Beam To Column Joint

  19. Wrong Practices

  20. Results

  21. Beam To Column Joint at lintel Level

  22. Our Practice Result Mistake

  23. Interior Beam-Column Joint 0‘-6" Beam long bar should passed from the center of column

  24. Wrong Practice Is it ok?

  25. Proper Plinth Corner Joint

  26. Band To Column Joint at corner

  27. Right way at middle/ Junction Minimum= 2 Feet

  28. OVERLAPPING

  29. Practice still continued Length of vertical bar not sufficient for 2nd Storey

  30. Why column fails?

  31. Proper way of Lapping Not more than 50 % bars lapped at a section Sufficient lapping length Location at mid height Min 4‘-0" Within lapping length, stirrups at closer spacing

  32. Our Practice (New) Lap length is 15”

  33. Overlapping in Beam Recommended Overlap should be equal to= 60 x D

  34. Identify Reasons?

  35. Framing around opening New After Remedy

  36. Infill Walls Connection With? Before OCT 2005

  37. Tie-up of Walls

  38. Tie-up of Walls

  39. Beam bar not bent up near support to overcome negative movement Why crack develop?

  40. Why crack develop?

  41. Bent up bars

  42. What is Our Practice Construct beam and slab together

  43. Steel Reinforcement • Commonly used steel reinforcement • Mild Steel • High Strength Deformed Bar • Should be free from loose mill scale, loose rust, coat of paints and oils, cracks, surface flaws, laminations etc • Should comply with requirement of dimension and weight • Should not break while bending

  44. Simple Steel Quality Test Making close hook 4d and bent the bar at 180 degree then straight it. Good quality bar doesn't break, while bad quality steel breaks.

  45. Spacers Concrete Cover Column= 1.5″ Beam= 1.5″ Slab=3/4″ Foundation=3″

  46. Thank You!!!

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