Panwin Designs Ltd. Baniachala (Bagher Bazar), Bhabanipur, Gazipur , rd May 2014

Transcription

1 Panwin Designs Ltd. Baniachala (Bagher Bazar), Bhabanipur, Gazipur , rd May

2 Observations Building 1 2

3 Observations Building 1 Stress Levels in Columns 3

4 Observations Building 1 Brick aggregate observed GL 5/B and GL I/6. Cursory calculations indicate columns on ground floor require immediate investigation. 4

5 Observations Building 1 Heavy Floor Loads 5

6 Observations Building 1 Storage loading on upper floors. Location of storage on 1 st and 3 rd floor. 6

7 Observations Building 1 Localised high loading due to concrete and plastic water tanks. Location of water tanks on the roof. 7

8 Observations Building 1 Substantial heavy partition of floor areas using low rise masonry walls. Location of masonry partitions on 1 st,2 nd and 3 rd floor. 8

9 Observations Building 1 Incomplete/inaccurate structural information on drawings 9

10 Observations Building 1 Concrete Mezzanine with access stairs located mid-way between ground and 1 st floor not shown on any structural drawings Location of mezzanines Concrete Mezzanine Steel Mezzanine No structural drawings indicating column size or reinforcement were available for Building 1. 10

11 Observations Building 1 Hairline cracking to beams 11

12 Observations Building 1 Hairline cracking recorded in beams on all floors of Building 1. Hairline cracking to beams. 12

13 Observations Building 1 Lightweight roof structures (side buildings) appear non-engineered 13

14 Observations Building 1 There were multiple nonengineered structures and lightweight roof structures. 14

15 Observations Building 2 15

16 Observations Building 2 Incomplete/inaccurate structural information on drawings 16

17 Observations Building 2 Drawings provided contradicted actual floor plan on all floors Column dimensions on structural drawings did not match existing structure. 17

18 Observations Building 3 18

19 Observations Building 3 Heavy Floor Loads 19

20 Observations Building 3 High levels of storage on upper floors. 20

21 Observations Buildings 4 and 5 21

22 Observations Buildings 4 and 5 Lightweight roof structures appear to be non-engineered 22

23 Observations Buildings 4 and 5 Apparently non-engineered lightweight roof connections to walls of Building 4 Lightweight roof structure over Building 5 23

24 24 Priority Actions

25 Problems Observed BUILDING 1 ITEM 1: Stress levels in Columns ITEM 2: Heavy Floor Loading. ITEM 3: Incomplete/inaccurate structural information on drawings. ITEM 4: Hairline cracking to beams. ITEM 5: Lightweight roof structures (side buildings) appear to be non-engineered. BUILDING 2 ITEM 6: Incomplete/inaccurate structural information on drawings. BUILDING 3 ITEM 7: Heavy Floor Loading. BUILDINGS 4 and 5 ITEM 8: Lightweight roof structures appear non-engineered 25

26 BUILDING 1 Item 1 and actions Stress levels in Columns Priority 1 (Immediate - Now) Priority 2 (within 6-weeks) The plastic water tanks at roof level are to be removed and the concrete water tank is to be emptied. The mezzanine floor slab is to be propped in the area shown on the next slide. Current levels of loading on all floors above the mezzanine area identified are to be limited to 1.5kPa. Factory Engineer to review design, loads and columns stresses in all columns. Verify insitu concrete strength either by 100mm diameter cores from 4 columns or existing cylinder strength data. Verify grade of steel reinforcement used. A Detail Engineering Assessment of Building 1 to be commenced, see attached Scope. Detail Engineering Assessment to be completed for complete building. Make structural alterations as advised by Factory Engineer. Produce and actively manage a loading plan for all floor plates within the factory giving consideration to floor capacity and column capacity. Priority 3 (within 6-months) Continue to implement load plan 26

27 27 Area of mezzanine floor to be propped

28 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 Elevation 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 28

29 Item No. Observation Recommended Action Plan Recommended Timeline 1 Heavy Floor Loading Reduce storage loading to 2kPa at all levels in the areas indicated on the next slide. Immediate - Now 2 Heavy Floor Loading Do not increase loads in other areas. Immediate - Now 3 Heavy Floor Loading Factory Engineer to check the capacity of the slab, beams and columns in the areas of heavy floor loading and prepare load plans as part of the Detail Engineering Assessment. 6-weeks 4 Heavy Floor Loading Make any necessary structural alterations as directed by the Engineer. 6-months 5 Heavy Floor Loading Continue to implement load plans. 6-months 6 Incomplete/inaccurate structural information on drawings Factory Engineer to update the drawings to asconstructed status to reflect the actual site dimensions and stair locations as part of the Detail Engineering Assessment. 6-weeks 7 Hairline cracking in beams Factory Engineer to investigate if the cracking has any structural significance as part of the Detail Engineering Assessment. 6-weeks 8 Hairline cracking in beams Carry out any remedial work as directed by the Engineer. 6-months 9 Lightweight roof structures (side buildings) appear nonengineered Factory engineer to check the capacity of the lightweight roofs to the side buildings under horizontal and vertical loading and make any necessary alterations. 6-months 29

30 30 Area of floor where loading is to be reduced to 2kPa (all levels)

31 Item No. Observation Recommended Action Plan Recommended Timeline 10 Incomplete/inaccurate structural information on drawings Factory Engineer to update the drawings to asconstructed status to reflect the actual site dimensions. 6-weeks 11 Heavy Floor Loading Factory Engineer to check the capacity of the slab, beams and columns in the areas of heavy floor loading and prepare load plans. 6-weeks 12 Heavy Floor Loading Make any necessary structural alterations as directed by the Engineer. 6-months 13 Heavy Floor Loading Continue to implement load plans. 6-months 14 Lightweight roof structures appear non-engineered Factory Engineer to check the capacity of the lightweight roofs to Shed Buildings under horizontal and vertical loading and make any necessary alterations. 6-months 31