Aman Graphics and Design Ltd. Nazimnagar, Hemayetpur, Savar, Dhaka ( E, N) 29 April 2014

Transcription

1 1 Aman Graphics and Design Ltd. Nazimnagar, Hemayetpur, Savar, Dhaka ( E, N) 29 April 2014

2 2 Building Observations

3 3 Building 1 - Columns appear to be stressed in excess of normal design limits

4 Typical layout Preliminary calculations indicate that working stress is at an extremely high level for one column near the toilets and under the water tank as shown in red on the diagram. All of the internal columns in the building are also at a reasonably high stress level. Building Engineer is to perform detailed design check based on as constructed dimensions, materials and loadings and use material data from concrete core tests to prove column adequacy. Tested Ground Floor Column Brick aggregate 4 Column Stresses Building 1

5 5 Shed 1, 2 & 3 Lateral stability and connections

6 No apparent stability in direction shown. Engineer to review the need for roof bracing. Steel truss welded to steel reinforcement from RC column. Connection may not be robust and roof may be susceptible to uplift. Building engineer to review. 6 Shed 1, 2 & 3 Lateral stability and connections

7 7 Buildings 2 and 3 - Lateral stability and connections on steel sheds at roof level

8 Column originally provided some stability. Stability system has been compromised in steel sheds at roof level of Buildings 2 and 3 due to removal of section to comply with fire regulations. Trusses welded directly to reinforcement. Connections to RC columns to be checked. Steel roof may be susceptible to uplift. Building Engineer to review. 8 Steel sheds

9 9 Buildings 1 Connections in ground floor extension

10 Non-engineered connections observed. Light dowels drilled into brickwork pier and tack welded to truss. Steel roof supported at end of cantilever. 10 Connections in ground floor extension

11 11 Building 1 - Cracking observed in finishes

12 Cracking in finish 1 st floor layout Cracking was observed in finishes on the top of the 1st floor cantilever slab in Building 1. However these were investigated by removing finishes and it was found that the cracks did not extend through to the structure. Cracks were investigated and did not extend into structure. 12 Cracking observed

13 13 Building 3 - Handrails

14 No handrail provided along edge to walkway Handrail provided but not robust. 14 Building 3 - Handrails

15 15 Inconsistencies between structural drawings and as-built structures

16 Extension of ground floor not shown on structural drawings for Building 1 or 2 Edge cantilevers not shown on structural drawings for Building 2 or 3 16 Drawing inconsistencies

17 17 Priority Actions

18 Problems Observed Item 1: Columns in toilet areas appear to be stressed in excess of normal design limits Item 2: Shed 1, 2 & 3 Lateral stability and connections Item 3: Lateral stability and connection design in steel sheds at roof level of Buildings 2 and 3 Item 4: Connections in ground floor extension to Building 1 Item 5: Inadequate handrails to walkway on Building 3 Item 6: Inconsistencies between structural drawings and as built structures 18

19 Item No. Observation Recommended Action Plan Recommended Timeline 1 Stresses in columns Maintain current use of the floors and level of live load Immediate - Now 2 Stresses in columns Building Engineer to review design, loads and column stresses in column identified near toilets. Immediate - Now 3 Stresses in columns 4 Stresses in columns Verify insitu concrete strengths either by 100mm diameter cores or existing cylinder strength data for cores from four columns. Building Engineer to review design, loads and columns stresses all internal columns. Immediate - Now 6-weeks 5 Stresses in columns Remove toilet build-up on all floors (advised that this is currently being implemented) 6-weeks 6 Stresses in columns Produce and actively manage a loading plan for all floor plates within the factory giving consideration to floor capacity and column capacity. 6-weeks 7 Stresses in columns Continue to implement load plan 6-months 8 Stresses in columns If required plans to reduce the size of the water tank at roof level 6-months 19

20 Item No. Observation Recommended Action Plan Recommended Timeline 9 Lateral stability and Lateral stability of all three sheds should be reviewed by connection design in Sheds 1, Building Engineer to access to need for roof bracing. 2 & 3 6-weeks 10 Connections from steel roof to RC columns should be Lateral stability and reviewed by the Building Engineer and, if required, upgraded connection design in Sheds 1, to support code vertical and wind loads or the area should 2 & 3 be vacated and removed. 6-weeks 11 Lateral stability and connection design in Sheds 1, Any remedial work necessary should be completed 2 & 3 6-months 12 Lateral stability and connection design in steel sheds at roof level of Buildings 2 and 3 Both lateral stability and connection design of steel sheds should be reviewed by the Building Engineer and, if required, upgraded to support code vertical and wind loads or the area should be vacated and removed. 6-weeks 13 Lateral stability and connection design in steel sheds at roof level of Buildings 2 and 3 Any remedial work necessary should be completed 6-months 20

21 Item No. Observation Recommended Action Plan Recommended Timeline 14 Inadequate handrails to walkway on Building 3 Handrails to be provided where they are missing 6-weeks 15 Inadequate handrails to walkway on Building 3 All handrails should be reviewed and upgraded to support code loads. 6-weeks 16 Structural drawings not consistent with the asconstructed arrangement of the factory Building Engineer to survey as constructed building. Updated drawings to be prepared showing the correct as constructed layout. 6-weeks 17 Structural drawings not consistent with the asconstructed arrangement of the factory Prepare/update calculations showing the structural adequacy of the building structure taking into account the factory design imposed loading and the as built structure. 6-months 18 Structural drawings not consistent with the asconstructed arrangement of the factory Prepare controlled loading plans for all floors designating where storage can be placed and can not be placed 6-months 21