10 Key Points | Examples | Techniques
Example
| The Existing Building | ||||
| Brief description | Badly damaged (80%). Vulnerable to normal typhoon. | |||
| Foundations |
Foundation walls: block cement with ring beam on 5cm concrete slab. | |||
| Structure | Bearing wall: block cement with cracks caused by settlement | |||
| Walls | Block cement walls without plaster, width=10cm, h=2.6m. | |||
| Works | Carpentry: wood in bad condition; Purlins and rafters: bamboo badly damaged | |||
| Roof structure | Carpentry: wood in bad condition; Purlins and rafters: bamboo badly damaged | |||
| Roof covering | Sheet iron | |||
| Doors & windows | Decayed wood | |||
| Total area / m² | 22,2m² | |||
| Total value / Dôngs | 6 660 000d | |||
| Value Dôngs / m² | 300 000 d/m2 | |||
The Evaluation of weak points (compared with the 10 key principles of cyclone resistant construction) and identification of strengthening works
| The Evaluation of weak points | ||||
| Principle | Evaluation | Reinforcement | ||
| 1. Location | Flat land | No change | ||
| 2. Shape of construction | Rectangular | No change | ||
| 3. Roof angle | 30° |
No change | ||
| 4. Roof overhang, veranda | Without a veranda Roof overhang = 20cm and is resistant |
Make new veranda with four reinforced concrete (RC) columns and rafters | ||
| 5. Liaison between : Foundation - Walls -Roof |
No connection between wall and rafters Unsafe connection between the wall and roof |
New RC foundation for columns, reinforced ring beams for
block cement walls. New block cement walls and posts with good connection |
||
| 6. Triangular bracing | No bracing | Steel bar diagonal braces | ||
| 7. Roof covering | Sheet iron Inadequate fixing of roof covering |
Rafters and purlins joined with re-bar. Reinforcing bar on the roof |
||
| 8. Opposing openings | Approximately |
Opening the windows in the back wall | ||
| 9. Doors and windows | Nearly destroyed (70%) | New doors and windows with locks | ||
| 10. Trees (as wind breaks) | Few trees around the house | Plant more trees around the house at a safe distance | ||
| Global evaluation | Risk of typhoon damage | Reinforcement | ||
| Cost of Works | ||||
| Item | Dongs | |||
| Initial value of the building |
6 660 000 | |||
| Works / Participation of the family | 910 000 | |||
| Works / Participation of DW | 3 349 200 | |||
| Initial value of the building | 6 660 000 | |||
| Works | 4 259 200 | |||
| Final value of the building | 10 919 200 | |||
| Final value / m² | 491 855 | |||
| Cost of reinforcement | 4 259 200 | |||
| % reinforcement / works | 100% | |||
| % reinforcement / final value | 39% | |||
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