Saasco Tex (BD) Ltd Muksudpur Apparels Ltd Expo Dress Ltd Julfikar Fashions Ltd

Transcription

1 Ltd Saasco Tex (BD) Ltd Muksudpur Apparels Ltd Expo Dress Ltd Julfikar Fashions Ltd Plot # 27, Holding # I/A, Milk vita Road, Section-7, Pallabi, Mirpur, Dhaka ( N, E) 24 th May

2 Observations 2 Observations

3 3 Stress levels in columns require immediate action

4 Cursory calculations indicate that the working stresses to the Ground Floor columns are at a level that requires immediate action. Detail Engineering Assessment required. The steel grade of reinforcement was not specified. However, due to the age of the building, mild steel is assumed. The reinforcement quantities recorded at Ground Floor level using the Ferroscanner appeared to coincide with the values provided in the Column Schedule. Brick aggregate was specified in the structural drawings and observed on-site. No loading plan was provided for the building. From observation, there was toilet slab build-up, storage and water tanks supported on the suspended slabs. Column Layout Plan 4 Critical columns requiring immediate action Stress levels in columns require immediate action Ferro-scan tests on columns

5 5 Cracking to external corner column

6 Cracking was observed to a corner column, exposed at the building perimeter. Building Engineer to investigate whether the cracks affect only the render, or propagate to the concrete column. Building Engineer to advise if repair and strengthening of the column is required. Cracking Column layout plan. 6 Cracking to Corner Column Column layout plan.

7 7 Damage to 3 rd floor Column

8 Column damage was observed to a corner column on Level 3. It was observed that an 80mm wedge of concrete had been removed from the column. No reinforcement was exposed by the damage. Building Engineer to review design, including geometry, reinforcement, loads and stresses to this column, and to specify any strengthening works if required. Column layout plan. 8 Damage to Column Column damage at Level 3.

9 9 Hairline cracking to Level 1 floor beams

10 Hairline cracking was observed to the beam soffits of Level 1. Evidence of plaster repair was observed. Building Engineer to investigate whether the cracks affect only the render, or propagate to the concrete beam. Building Engineer to advise if repair and/or strengthening of the beams is required. Evidence of repair to Level 1 soffit Cracking Cracking of Level 1 beam soffit 10 Hairline cracking to floor beams Cracking of Level 1 beam soffit

11 11 Slab damage and exposed reinforcement

12 Damage to the soffit of slabs was observed on site. In the damaged areas, reinforcement had been exposed. Building Engineer to determine extent of damage, review capacity and structural integrity of the slab and specify rectification works. 12 Soffit damage in generator room. Slab damage at water tank slab (roof). Slab damage and exposed reinforcement

13 13 Non-engineered/Lightweight structures

14 Lightweight steel roof structures were observed at roof level and above the generator rooms. An external steel staircase was also observed on the North elevation. These structures do not appear to be engineered, and drawings were not available to show structural intent. Building Engineer to review the design of these structures and to implement any upgrade works if required. Steel roof structure Roof structure above generator rooms. Non-engineered/Lightweight structures 14

15 Steel staircase on North elevation Non-engineered/Lightweight structures 15

16 16 Missing documentation and inconsistencies in documentation provided

17 Original documentation or load management drawings were not available on the day of the survey. Inconsistencies were observed between the drawings and what was observed on-site. Primarily, these inconsistencies were differences between floor use specified on the drawings and that which was observed on site. Building Engineer to provide an updated set of as-built structural and architectural drawings for all of the buildings on the site. Structural drawing shows observed floor layout Structural framing plan Architectural layout plan 17 Missing documentation and inconsistencies in documentation provided

18 18 Priority Actions

19 Problems Observed 1. Stress levels in columns require immediate action. 2. Design check required due to discrepancies between as-built drawings and observed structure location of stairs and toilets 3. External staircase steelwork requires calculation check to confirm that it is designed to resist loading on evacuation 4. Cracking to corner column 5. Damage to 3 rd floor column 6. Hairline cracking to Level 1 floor beams 7. Slab damage and exposed reinforcement 19

20 Item No. Observation Recommended Action Plan Recommended Timeline 1 Stress levels in columns require immediate action Loading to be limited to 1.5kN/m2 at each suspended level throughout the building, pending verification of column capacity by the Building Engineer Immediate - Now 2 Stress levels in columns require immediate action Factory Engineer to review design, loads and column stresses in all areas. Immediate - Now 3 Stress levels in columns require immediate action Verify in-situ concrete strength by 100mm cores from min. 4 columns. Immediate - Now 4 Stress levels in columns require immediate action Verify reinforcement quantities and sizes for all columns in the ground floor. Immediate - Now 5 Stress levels in columns require immediate action A Detail Engineering Assessment of Main Factory Building to be commenced, see attached Scope. Immediate - Now 6 Stress levels in columns require immediate action Produce and actively manage a loading plan for all floor plates within the Factory Building, giving consideration to floor capacity and column capacity. 6-weeks 7 Stress levels in columns require immediate action Detail Engineering Assessment to be completed. 6-weeks 8 Stress levels in columns require immediate action Continue to implement load plan. 6-months 20

21 Detail Engineering Assessment This Schedule develops a minimum level of information, Analysis and testing expected as part of a Detail Engineering Assessment. The Building(s) have been visually assessed and it is deemed necessary that a detailed engineering assessment be carried out by a competent Engineering Team employed by the factory Owner. This Request should be read in conjunction with the BUET developed Tripartite Guideline document for Assessment of Structural Integrity of Existing RMG Factory Buildings in Bangladesh (Tripartite Document), the latest version of this document should be referenced. T his document also gives guidance on required competency of Engineering Team. We expect that the following will be carried out: 1. Development of Full Engineering As-Built Drawings showing Structure, loading, elements, dimensions, levels, foundations and framing on Plan, Section and Elevational drawings. 2. The Engineering team are to carry out supporting calculations with a model based design check to assess the safety and serviceability of the building against loading as set out in BNBC-2006, Lower rate provisions can be applied in accordance with the Tripartite Guidelines following international engineering practice, justification for these lower rate provisions must be made. 3. A geotechnical Report describing ground conditions and commenting on foundation systems used/proposed. 4. A report on Engineering tests carried out to justify material strengths and reinforcement content in all key elements studied. 5. Detailed load plans shall be prepared for each level showing current and potential future loading with all key equipment items shown with associated loads. 6. The Engineering team will prepare an assessment report that covers the following: As-Built drawings including Plans at each level calling up and dimensioning all structural components Cross sectional drawings showing structural beams, slabs, floor to floor heights, roof build-ups and Basic design information of the structure Highlight any variation between As-built compared to the designed structure Results of testing for strength and materials Results of geotechnical assessment and testing/investigation Details of loading, inputs and results of computer modelling Commentary on adequacy/inadequacy of elements of the structure Schedule of any required retrofitting required for safety or performance of Structure Any proposals for Retrofitting to follow guidance developed in the Tripartite Document 21

22 Item No. Observation Recommended Action Plan Recommended Timeline 9 Design check required due to discrepancies between asbuilt drawings and observed structure e.g. stair locations, column sizes As part of Detail Engineering Assessment (see Item 1), Building Engineer to commence survey of as-built structure and update drawings including a verification of the location of stairs and column sizes. Immediate - Now 10 Design check required due to discrepancies between asbuilt drawings and observed Complete as-built survey. structure e.g. stair locations, column sizes 6-weeks 11 Design check required due to discrepancies between asbuilt drawings and observed Incorporate findings into loading plan (Refer to Item 1) structure e.g. stair locations, column sizes 6-weeks 12 Design check required due to discrepancies between asbuilt drawings and observed Continue to implement load plan. structure e.g. stair locations, column sizes 6-months 22

23 Item No. Observation Recommended Action Plan Recommended Timeline 13 Check required to confirm Design of the steel staircase on the rear of the premises to that steel staircase on the be checked by the Building Engineer and, if required, rear of the premises is upgraded to support code vertical and wind loads - designed to resist evacuation otherwise they should be vacated and removed. loads 6-weeks 14 Check required to confirm that steel staircase on the Carry out any necessary modifications to steel staircase rear of the premises is arising from design check. designed to resist evacuation loads 6-months 15 Cracking to external corner column Building Engineer to advise if structural repair and/or strengthening of the column is required. 6-weeks 16 Cracking to external corner column Carry out any necessary structural repairs / strengthening to column. 6-months 17 Damage to Column on the 3rd Building Engineer to open up damaged area and assess floor damage to concrete and reinforcement. 6-weeks Review design, including geometry, loads and stresses to Damage to Column on the 3rd this column, and specify any structural repairs / floor strengthening works if required. Damage to Column on the 3rd Provide structural repairs / strengthening to the column as floor required. 6-weeks 6-months 23

24 Item No. Observation Recommended Action Plan Recommended Timeline 20 Hairline cracking to Level 1 floor beams Building Engineer to investigate whether the cracks affect only the render, or propagate to the concrete beam. 6-weeks 21 Hairline cracking to Level 1 floor beams Building Engineer to advise if repair and/or strengthening of the beams is required. 6-weeks 22 Hairline cracking to Level 1 floor beams Provide structural repairs / strengthening to the beams as required. 6-months 23 Slab damage and exposed reinforcement Provide structural repairs to the slabs. 6-weeks 24