collapse of 4 storied building in begunbari--- col… · the reasons behind the collapse of the...

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Collapse of 4 storied building in Begunbari‐‐‐A pictorial case study Md. Nurul Alam Project Coordinator/Structural Engineer, Project Coordinator/Structural Engineer, ADPC

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Page 1: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Collapse of 4 storied building in Begunbari‐‐‐A pictorial case study

Md. Nurul Alam

Project Coordinator/Structural Engineer,Project Coordinator/Structural Engineer,

ADPC

Page 2: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

OverviewOverview

• Date: June 01 2010Date: June 01, 2010

• Time: 11 PM Local time

i 8/ ddh b i Offi• Location: 18/B, Moddho Begunbari Post Office

• Type of Building collapsed: RCC ( LC‐Non‐Engineered), 4 storied

• Construction year of the building : 1999y g

• Casualty: 19 died as on June 02, 2010, number of casualty may increaseof casualty may increase

Page 3: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Paper Clippings of June 02, 2010Paper Clippings of June 02, 2010

Page 4: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

LC building collapsed on a tin‐shed b ldbuilding

Tin Shed

LC Building

Page 5: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Missing of Sufficient Ties in columnsMissing of Sufficient Ties in columns

Page 6: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Narrow Access route made the k d ff lresponse work difficult

Page 7: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

The Structure was built on a recently f ll d l dfilled land

Page 8: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

(Ground Floor)Soft Storey Effect!

Page 9: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Bad Choice of Construction materialsBad Choice of Construction materials

Page 10: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Brittle failureBrittle failure 

Page 11: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Bad connection to the groundBad connection to the ground

Page 12: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

Short Column EffectShort Column Effect

Page 13: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

RemarksRemarks

The reasons behind the collapse of the buildingThe reasons behind the collapse of the building may be listed as follows:

• Improper site selection even the land was filled with garbageImproper site selection, even the land was filled with garbage instead of soil.

• Some heavy construction material were stored in the top floor of the building, which might lead the collapse.

• Low stiffness of the ground floor ( GF soft) might lead to the collapsecollapse.

• Foundation was not designed properly and the connection between the column and the base was not adequate.

Page 14: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

FSCD, Police, AFD, BDRCS, Ansar, community volunteers all were involved in the S&R operations , but still the collapsed building p , p g

could not be removed.

Page 15: Collapse of 4 storied building in Begunbari--- Col… · The reasons behind the collapse of the building may be listed as follows: • Improper site selection, even the land was filled

It is not a special case in the area. Still there are so l bl t t i th ti l l !many vulnerable structures in the particular place!