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Old Buildings structural audit health report with repair solutions


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Most of the Society office bearers tend to avoid thinking over the issue of Building Repairing; as the process of undertaking is quiet complex in nature and there are many ifs and buts, prior to even starting to start the same. CSR Consultant and Associates comes in handy at this stage.

As per BMC bye laws nos. 77, every building is supposed to carry Structural audit of the building after 15 years of age of completion of constructions. Every 5 years till the structure attains an age of 30 yrs and there after every years, to ensure the safety of the property and lives associated with. CSR provides Structural Auditing with every possibility of budgetory and undertakes Tender management to completion of work as desired.

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Old Buildings structural audit health report with repair solutions

  2. 2. Objectives: 1. Develop awareness about the “health problems” of R.C.C. components of buildings 2. Classify various causes of deterioration 3. Explain various types of deterioration 4. Suggest preventive measures forlong life of buildings.
  3. 3. Q. Why there is Need forBuilding Maintenance? To strengthen its weakermembers & lengthen its life. Q. Classify the types of Defects in building: - Macro defects: Visible fromnaked eye -Micro defects: Not visible from naked eye
  4. 4. Q. What are the causes fordeterioration of RCC buildings? 1. Poorstructuraldesignandspecifications 2. Poorquality of construction 3. Poormaintenance of buildings 4. Environmental problems and aging effects 5. Indiscriminate additions & alterations 6. Natural & manmade calamity
  5. 5. 1.Poorstructural design & specifications -Densely spaced steel bars -Segregated concrete at beamcolumn junction -Honey combing of concrete
  6. 6. 2.Poorconstruction & overloading with illegal mezzanine floors
  7. 7. PoorConstruction, Poorquality of materials used & poorsupervision.
  8. 8. Poorconstruction & neglected maintenance
  9. 9. Checkformaterials like cement,sand admixtures etc. -Propermixing and batching of materials c Silt & clay in sand Excess waterin mortar
  10. 10. 3.Poor maintenance -Leaking roof -Spalling of Concrete due to corrosion
  11. 11. -Preventing Vegetative growth on Buildings
  12. 12. - Collapse during Extension work - Collapse during Modification,Renovation
  13. 13. 4- Environmental Conditions around the Buildings, Chemicals like carbon-dioxide, chlorides, nitrous oxides, moisture and sulphates 5- Overloading of structure orWeakening its structural members due to alteration/renovation.
  14. 14. -Weakening the Structure by Chipping of Concrete and Removing Reinforcement Steel -Weakening the Structure in Stilt Portion (Parking Area) of the building
  15. 15. . -Propersupporting,propping forload carrying members
  16. 16. Chipping of defective ordeteriorated concrete
  17. 17. Properpacking of mortarbetween RCC beams,columns and brickmasonry
  18. 18. Repairs by guniting/jacketing with concrete ortreated with cement orpolymerconcrete Roughened base coat of plasterfor bettermechanical bond with the finishing coat.
  19. 19. Curing by ponding wateron horizontal surface Curing by spraying waterat regular intervals on vertical surface
  20. 20. To reduce cost :Checkthe locations where repairs are necessary and where repairs need not be done. Whole plasteris replaced. Removal of rust before repairusing guniting
  21. 21. Rusting of steel in RCC column on ground floor resulting in spalling of concrete Cracks,crevics ,joints and junctions should be properly packed before repairs.
  22. 22. Cracks developed due to impropercuring. Failure due to modification
  23. 23. Building before repairs and afterrepairs
  24. 24. Corrosion of steel & spalling of concrete due to ingress of moisture
  25. 25. -Cantilevercanopy showing porous honeycombed concrete -Deteriorated cantileverbalcony slabs
  26. 26. Spalled concrete due to corrosion of steel by leakage
  27. 27. - Cracks oversuperficially repaired surface - Corrosion of steel in RCC beam
  28. 28. 5.Indiscriminate Addition & Alterations in Buildings Some DO’S & DON’TS Alterations in Window balcony
  29. 29. Additions to window canopy
  30. 30. Conversion of balcony into dressing room
  31. 31. Conversion of balcony into a bath room
  32. 32. Adding waterfall & potted plants on balcony
  33. 33. Overloading the RCC building by installing large tanks Before After
  34. 34. Careless modification causing damage to structure
  35. 35. Damaging RCC beamto conceal electric conduits & adding load by new floortiles
  36. 36. Chamfering RCC columns in stilt area to avoid damage to cars
  37. 37. Removing RCC beams & columns between two flats
  38. 38. Removing RCC beam and part of RCC slab & Introducing additional staircase load to interconnect two flats
  39. 39. Introducing additional load on RCC slab & beamby relocating partition wall
  40. 40. Natural calamities of building failure -Earthquake -Floods -Terrorist attack -Bomb blast
  41. 41. Conclusion: How to increase life of any building? To prevent deterioration of R.C.C. buildings proper measures are required in following steps. 1.Properstructural design and specifications 2.ProperConstruction practices 3.Timely Preventive Maintenance 4.Checkindiscriminate additions & alterations 5.Safety fornatural & manmade calamity
  42. 42. Treat the old building as hospitalised human being. -Engineers/Consultants are like Physicians. -Contractors are like surgeons. -Occupants are like relatives of the building. So timely action is very important for the long life of buildings.