INITIAL STRUCTURAL INTEGRITY ASSESSMENT REPORT (SIAR)

Transcription

1 INITIAL STRUCTURAL INTEGRITY ASSESSMENT REPORT (SIAR) The Alliance for Bangladesh Worker Safety Page 1/12

2 Introduction to the Report The following report contains a site profile and summary of non-conformities identified during an onsite assessment commissioned by the Alliance for Bangladesh Worker Safety (Alliance) and conducted by a third-party Qualified Assessment Firm (QAF). The assessment was conducted against the Alliance for Bangladesh Worker Safety Assessment Protocols (APs) and Fire Safety and Structural Integrity Standard, which is harmonized with the factory assessment guidelines developed by Bangladesh University of Engineering and Technology (BUET) for the Bangladesh National Tripartite Plan of Action (NTPA). The goal of the Alliance process is to provide clear and practical technical requirements by which Bangladeshi Ready Made Garment (RMG) Factories producing for Alliance members may be consistently and fairly evaluated for fire, structural, and electrical safety in a non-duplicative manner. Each assessment will prompt action plans that will be used by RMG factories to systematically and sustainably improve safety conditions for garment workers. Beyond tracking and reporting on action steps taken in a transparent manner, the Alliance organization and its members will seek to further support factory improvements through technical assistance, training, implementation support for functional Worker Committees, and in some cases financial assistance and wage support for workers if factories are closed for remediation. The contents of the report do not constitute a guarantee of compliance with the applicable laws, the Alliance Standard or the absolute or continued safety against fire, electrical and/or structural integrity issues that may lead to injury or loss of life. The report is designed to provide a non-exhaustive summary of risk issues, based on a limited sampling and duration of time onsite by the named QAF. Neither the QAF nor the Alliance can certify or guarantee the quality, outcome, or effectiveness of actions taken in response to the report. For more information and report feedback please go to: The Alliance for Bangladesh Worker Safety Page 2/12

3 GENERAL INFORMATION General Information Country: Province: City: Bangladesh Dhaka Savar Zip Code: Audit Duration: Re-Audit: 2 Days Re-Audit After 0 Months Draft Report Date : 23 September, 2015 Final Report Date : 30 September, 2015 Are all Action Items From Previous Assessment Completed?: Buildings in Complex : Number of Building Levels (Stories) : Approximate Building Area (SF) : Date of Building Construction : Date of Last Building Renovation/Addition : Is the Building mixed use?: Ancillary Structures in Complex : Number of Ancillary Levels (Stories) : Approximate Ancillary N/A 3 (Three) 1 main building 2 ancillary buildings 6 (six) storied building. Main building area is approx sft N/A No 2 (two) Generator rooms Single storied building. Approximately 732 sft. The Alliance for Bangladesh Worker Safety Page 3/12

4 Structures Area (SF) : Number of Occupants : Exterior Facade Description : Structural System Description : Issues were not found during the structural integrity assessment that required the Emergency Escalation Protocol (and referral to NTC Review Panel)?: 385 (Approx.) 215 for Darda Knitwear Ltd. Unreinforced brick masonry with glass window. Building frame system No The Alliance for Bangladesh Worker Safety Page 4/12

5 ASSESSMENT FINDINGS Structural System Design Are the available FoS for the columns adequate based on Preliminary calculation? High Column FoS calculations were performed using a concrete compressive strength of 2045 psi (according to the Alliance Standard minimum for masonry chip aggregate concrete) and a reinforcement strength of 40 ksi. Column FoS results are listed below for both 42 psf and 20 psf live loads. Central column / 2.54; Corner column / Edge column / 1.28; Edge column / The Review Panel met regarding this factory and compiled a findings report and list of recommendations, including a detailed engineering assessment to be conducted urgently. Uploaded Document: FOS calculation sheet, Review Panel recommendations Complete the Review Panel's suggested course of action, listed below: 1.Cantilever of south part of the building (as shown in the attached drawing) to be demolished immediately (within 7 days from today - September 1, 2015) under the close supervision of certified professional structural engineer. However, 6" cantilever shall remain beyond the columns. Debris of this demolition must be removed simultaneously. Adequate propping to be done from ground floor to top floor (up to 7'-0" from the edge columns - as shown in the attached drawing) prior to the demolition work. The propping scheme should be designed by a qualified structural engineer. 2. All partition walls in the toilet block must be removed and replaced by light partition. 3. Operations in the building to be suspended immediately (within 2 days from today - September 1, 2015) until the completion of the demolition work. The operation in the building may resume after the demolition work. 4. Urgent DEA (detailed engineering assessment) to be started and completed within 6 weeks (by October 15, 2015) under the supervision of a team of certified professional structural engineers. 5. Depending on the findings of the approved DEA and retrofitting work, permanent remedial measures should be taken within a very short period of time for the safety of the building. 6. All those activities should be monitored by an inspector of DIFE for strict compliance. Provide results of preliminary calculations in space provided. a) column capacity; FoS > Safe b) column capacity; FoS Needs Evaluation c) Column capacity; FoS Needs Evaluation d) Column capacity; FoS < Unsafe In case of a critically low FoS (<1.25), consider Immediate Escalation Protocol Are credible structural design documents available for review and kept on site? The Alliance for Bangladesh Worker Safety Page 5/12

6 No credible structural design drawings were available. Significant differences between the available structural drawings and the as-built configuration were noted. Document Review: Credible structural drawing not available. Have a qualified structural engineer prepare credible as-built documents based on the requirements of Part 8 Section 8.19 of the Alliance Standard. Alliance Standard Part 8 Section 8.19 Required Structural Documentation for New and Existing Factories Can credible structural documentation indicating general conformance with 2006 BNBC or other comparable applicable international model building code be produced? The available design drawings do not mention code conformance. Document Review: As built drawing of building. Engage a qualified structural engineer to develop the required documents to confirm the structural integrity of the buildings. Documents must comply with Alliance Standard Part 8 Section 8.19 and Reference Alliance Standards Part 8 Section 8.2 Structural Integrity of Existing Factory Buildings Can documentation be provided that the building is compliant with the requirements for wind loading and storm surge loadings as detailed in BNBC Part 6 Section 1.5.3? No documentation regarding compliance with requirements for wind and storm surge loading was available for review. Document Review: As built drawing of building Engage a qualified structural engineer to confirm satisfactory structural performance of the buildings under wind loading. The Alliance for Bangladesh Worker Safety Page 6/12

7 2006 BNBC Part 6 Section 1.5. Compliance may be waived if the Factory Owner provides satisfactory evidence of a cyclone operations plan that includes full evacuation of the factory in advance of any approaching cyclone" Have provisions been made in floors or decks for a concentrated load (such as heavy equipment, water tanks, stored materials, etc) applied at a location wherever this load acting upon an otherwise unloaded floor would produce stresses greater than those caused by a uniform load? Fabric load was found on 5th floor and heavy storage was found on 3rd floor. Loading on both floors were more than 100 psf. Rooftop water tank was found but load of them is not significant. Visual Assessment: 1.Photograph of storage 2.Photograph of rooftop water tank Engage a qualified structural engineer to confirm and document that provisions have been made to accommodate concentrated loads. If provisions have not been made, have a qualified structural engineer develop a remediation plan. Alliance Standard Part 8 Section 8.13 and 8.14 Where density of operations, storage of materials, or equipment weights require live load capacity in excess of 2.0 kn/m2 (42 psf), do the design documents confirm that the required load capacity exists? Or has the load capacity been analytically confirmed and certified by an Alliance-qualified structural engineer? We found more than 100 psf load at some floors. In the design drawing there was no capacity of the floor is mentioned. The floor capacity is not certified by an Alliance-qualified structural engineer. Visual Assessment: Photograph of high loading in 3rd and 5th floor Have a qualified structural engineer confirm that capacity to support the load is available. Load Plans complying with Alliance Standard Part 8 Section should also be developed. Alliance Standards Part 8 Section 8.15 Minimum Floor Design Loads The Alliance for Bangladesh Worker Safety Page 7/12

8 If built after 2006, can documented compliance with the seismic and wind requirements of the 2006 BNBC be provided? It was built after But, in drawing seismic and wind consideration was not mentioned. Document Review: Structural drawing Have a qualified structural engineer document compliance with the seismic and wind requirements stated in the 2006 BNBC. Alliance Standards Part 8 Section 8.17 Design for Lateral Loads and 2006 BNBC Part 6 Section 1.5 Is a clear and redundant load path to resist lateral loads provided? As the building consists of flat plate, so there is no redundant load path. Visual Assessment: Site visit on 8 August, Have a qualified structural engineer complete further analysis of the structure and develop a remediation plan if required. Alliance Standards Part 8 Section 8.17 Design for Lateral Loads and BNBC Part 6 Section 1.5 Are Certificates of Occupancy available for review? Low Certificates of occupancy are not available. Document Review: No certificates available Provide Certificates of Occupancy for review. The Alliance for Bangladesh Worker Safety Page 8/12

9 Alliance Standard Part 8 Section 8.3 Preliminary Structural Assessment Structural System Construction Are the performance of key structural elements such as columns, slender columns, flat plates and transfer structures satisfactory? High Column: Column size is inadequate in edges and factor of safety of corner and edge column is below Slender Column: We did not find any slender column. Flat plates: Flat plate is inadequate. Floors: Thickness is inadequate for punching shear. Cantilevers: Cantilevers of south part must be demolished immediately. 6" cantilever may exist beyond column. We didn't find any transfer girder in the factory buildings. Visual Assessment: Site visit on August 8, 2015 Engage a qualified structural engineer to confirm structural performance of the structure. Alliance Standard Part 8 Section Is the structural system free of distress, settlement, shifting, or cracking in columns or walls? High Cracks have been found between wall and roof at 5th floor. Photograph: Photograph of cracking in wall. Have a qualified structural engineer to provide further testing and analysis of distress, settlement, shifting, or cracking in columns and walls and provide a remediation plan to correct noted issues. Alliance Standard Part 8 Section If yes, have the structural members constructed with MCAC been investigated by an appropriate program of in-situ testing and representative destructive testing or core samples? The Alliance for Bangladesh Worker Safety Page 9/12

10 No evidence of previous in-situ testing and representative destructive testing or core samples were found. Document Review: No evidence of representative testing was found. As part of the detailed engineering assessment outlined elsewhere via the column FoS question, conduct destructive core testing to validate the in-situ concrete compressive strength of structural elements. Reference Alliance Standards Part 7 Building Materials Section 7.2 Masonrychip aggregate concrete (MCAC) Have all areas of needed maintenance, including areas with efflorescence, dampness, standing water on rooftops, and corrosion been addressed. Dampness and corrosion were not found during inspection. Water ponding was found on roof due to rooftop water tank. Visual Assessment: Photograph of water ponding on roof Under guidance from a qualified structural engineer, address all areas of needed maintenance by correcting the identified issues. Alliance Standard Part 8 Section 8.26 Durability and Maintenance Are all non-structural elements suspended from, attached to, or resting atop the structure adequately anchored and braced to resist earthquake forces? Some unbraced heavy storage were found on 3rd and 5th floor. Unbraced water tank was found on roof. Photograph: 1. Photograph unbraced heavy storage 2. Photograph of unbraced water tank. Develop engineered plans to brace all non-structural elements (heavy storage must be removed) to resist earthquake forces to comply with the BNBC and Alliance Standard. Alliance Standards Part 8 Section 8.18 Seismic Bracing of Key Non-Structural The Alliance for Bangladesh Worker Safety Page 10/12

11 Elements and 2006 BNBC Part 6 Structural Safety Programs Is a program in place to ensure that the live loads for which a floor or roof is or has been designed will not be exceeded? A load management program is not currently in place. Visual Assessment: Site visit on August 8, 2015 Develop a program to ensure that all live loads for which a floor or roof has been designed for will not be exceeded. The designated Load Manager shall oversee this program and ensure it is enforced. Alliance Standard Part 13 Section 13.7 and Part 8 Section 8.9. Have Load Plans been prepared for each floor documenting the actual maximum operational loading that is intended and/or allowable on each floor. Low No load plan was found. Visual Assessment: Site visit on August 8, 2015 Have a qualified structural engineer develop Floor Loading Plans per the requirements of Part 8 Section Alliance Standard Part 8 Section 8.10 Floor Loading Plans (Load Plans) Are Floor Load Plans posted as required? Low No load plan was found. Visual Assessment: Site visit on August 8, 2015 Have a qualified structural engineer prepare load plans including the information required in Section 8.20 of the Alliance Standard. The Alliance for Bangladesh Worker Safety Page 11/12

12 Alliance Standard Part 8 Section Are areas used for storage of work materials and work products, clearly marked to indicate the acceptable loading limits as described in the Load Plan for that floor? Low We didn't find any loading limit markings in the floors for the building. Visual Assessment: Sie visit on August 8, 2015 Provide signage or the appropriate markings at all areas used for storage to indicate the acceptable loading limits detailed in the Load Plan. Alliance Standard Part 8 Section 8.11 Floor Load Markings Is a designated representative (Factory Load Manager), who is onsite full time, trained regarding the structural floor capacity, and serves as an ongoing vendor resource and monitor of operational factory floor loadings? Low No factory load manager was onsite full time. So, a factory load manager is required to check whether the loads exceed or not as per floor load plan. Visual Assessment: Site visit on August 8, 2015 Designate a representative as the Factory Load Manager. The Factory Owner shall ensure that at least one individual, the Factory Load Manager who is located onsite full time at the factory, is trained in calculating operational load characteristics of the specific factory. The Factory Load Manager shall serve as an ongoing resource to RMG vendors and be responsible to ensure that the factory operational loads do not at any time exceed the factory floor loading limits as described on the Floor Loading Plans. Alliance Standards Part 8 Section 8.9 Factory Load Manager The Alliance for Bangladesh Worker Safety Page 12/12