Posh Garments Ltd Ltd

Transcription

1 Posh Garments Ltd Ltd 384/A, Tejgaon Industrial Area, Dhaka 1215 ( , ) 6 th April

2 2 Observations

3 3 Stress Levels in Columns

4 Cursory calculations indicate that the working stress of the columns at Ground Floor level are at a high level. Refer to Action 1. Building Engineer to verify in-situ concrete strength and confirm grade of steel reinforcement used. Ground Floor Plan Stone Aggregate Tested Columns Brick Aggregate Construction of the building began in 2002, with construction of Foundation and Ground Floor levels. Levels 1 and 2 were subsequently constructed in 2003, Levels 3 and 4 in 2004, and Levels 5 and 6 in Brick aggregate was noted in 2 of the 5 columns exposed, with stone aggregate noted in the other 3. There is a discrepancy in the drawings in relation to the aggregate type, with one drawing (S-05) referencing stone aggregate, while another drawing (S-01) calling up brick aggregate. HY reinforcement, which is called up in the structural drawings, was noted in the slab at 1 st Floor level and in the columns at roof level. Tested Column (Stone) Tested Column (Stone) Column (Brick Aggregate) Column (Brick) 4 Column strength

5 Heavy floor loading in storage and toilet areas and locally in office area 5

6 Areas of high storage loading were noted at specific areas of the building, particularly to the cantilever to the East side of the building. Building Engineer to check that the beams and slabs have been adequately designed to carry the storage loading. 2 nd Floor Boxed storage 3 nd Floor Boxed storage 2 nd Floor Boxed storage Boxed Storage to 2 nd Floor Boxed Storage to 2 nd Floor Boxed Storage to 3 rd Floor Typical Floor Plan 6 High Loading

7 Areas of high dead loading were noted at specific areas of the building, as indicated. Building Engineer to check that the beams and slabs have been adequately designed to carry the actual loading. Toilet plinths & slabs to all floors 500mm plinth in 1 st Floor Office area Toilet plinths to 4 th & 5 th Floors Typical Floor Plan Toilet plinths to 2 nd & 3 rd Floors 1 st Floor 500mm Plinth to Office Area Various Floors - Toilet Plinths Various Toilet Slabs 7 High Loading

8 Loading Plans to be updated to include live loading 8

9 A Loading Plan, specific to the Posh Garments Ltd factory building, was made available for review during the Building Manager Interview. It appears that the Loading Plan was prepared by the Design Engineer responsible for the design of the building, and that the different floor loadings highlighted were based on loadings observed at the factory at one particular moment in time; it is not clear whether the loads represent maximum floor loading. The floor loadings are light and they do not appear to consider live load due to personnel. Building Engineer to update the Loading Plan, with due consideration for loading due to personnel, and to confirm the maximum floor loading capacity of each floor area of the building. Extract from Factory Loading Plan 9 Factory Loading Plan

10 10 Apparently non engineered roof structures

11 Building Engineer to review the design of the lightweight roof structures to the Ground Floor extension, and at 6 th and 7 th Floor Roof levels, and confirm that they are adequate to resist wind loading. Building Engineer to implement any upgrade works to these structures deemed necessary following the above review. 7 th Floor - Lightweight Steel Roof 6 th Floor - Lightweight Steel Roof Ground Floor Steel Structure 7 th Floor - Lightweight roof above fabric storage area 6 th Floor - Lightweight roof above building maintenance storage area Roof Plan 11 Lightweight Steel Roofs Ground Floor - Lightweight Steel Structure above building extension

12 12 Priority Actions

13 Problems Observed ITEM 1: Stress levels in Columns ITEM 2: Heavy floor loading in storage and toilet areas and locally in office area. ITEM 3: Loading Plans to be updated to include live loading. ITEM 4: Apparently non engineered roof structures. 13

14 Item No. Observation Recommended Action Plan Recommended Timeline 1 Stress levels in Columns 2 Stress levels in Columns 3 Stress levels in Columns Factory Engineer to investigate aggregate type used in each individual column at Ground and First Floor levels. Factory Engineer to review design, loads and columns stresses in all columns using a model based design check to loading set out in BNBC Factory Engineer to verify insitu concrete strength by taking 100mm diameter cores from 4 brick aggregate columns. Verify grade of steel reinforcement used. 6-weeks 6-weeks 6-weeks 4 Stress levels in Columns Make structural alterations as advised by Engineer 6-months Heavy floor loading in storage and toilet areas and locally in office area Heavy floor loading in storage and toilet areas and locally in office area Loading Plans to be updated to include live loading Engage an Engineer to investigate the floor loading, and advise on any necessary alterations taking account of floor capacity and column capacity Make any structural alterations as advised by Factory Engineer Engage an Engineer to update the Loading Plan drawings to incorporate the maximum allowable loading which can be applied to each floor area inclusive of live loading due to personnel 6-weeks 6-months 6-weeks 8 Apparently non engineered roof structures Building Engineer to check the capacity of the lightweight roofs and make any necessary alterations 6-months 14