aliftextiles ltdcdn.bangladeshaccord.org/factory-reports/english/2014/03/alif... · confirm...
TRANSCRIPT
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Alif Textiles Ltd74/A, Science Laboratory Road, Dhanmondi, Dhaka
(+23.7396N, 90.3859E)
9 November 2013
1
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2
Site Observations
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3
Structural drawings do not match the as
constructed structure
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4Structural Drawings – not as built
Structural Discrepancies
Structural Drawing presented
Discrepancies Noted
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5Structural Drawings – not as built
Discrepancies Noted
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Structural Drawings - Movement Joints
2 building movement joints which
were not shown on drawings
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Structural Drawings - Movement Joints
Movement joint on southeast
corner of building with
cracking of plaster render at
junctions of joint
Beam cantilever to allow for
movement joint on ground floor
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Structural Drawings - Movement Joints
Movement joint at north section of
circular sector with cracking of plaster
render at junctions of joint
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Verify concrete stresses and in-situ strengths
for concrete columns
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Verify concrete stresses in columns /
compare with in-situ concrete strength
Building Engineer is to verify in-situ
strengths of concrete and compare
with stresses in columns. Detailed
Engineering Assessment required for
building
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Cracking in beams on underside of 2nd and 5th
floors
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Cracking in beams
Hairline cracks to beam on
underside of 2nd floor
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Cracking in beams
Crack to beam on underside
of 5th floor
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Column in North West corner - confirm
vertical load path throughout building and
stress in column at ground floor level
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Confirm Loadpath / Column Design
Building Engineer is to perform
detailed calculations and concrete
tests to prove column size; Column
to be reinforced if required
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Vertical Load Path to Ground Floor
Transfer of loading through
building to external column
on northwest corner of
building
Column at corner is
triangular with different
dimensions to typical
column
Building Engineer to check
design of corner column and
transfer beam
Building Assessment to review if
this column is a key element and
as such should be provided with
a protective barrier.
What is impact of loss of
column?
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Exposed reinforcement to slab overhangs in
future lift shaft and front elevation
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Deterioration of Building
Structure
Deterioration of concrete
and corrosion of
reinforcement to slab
overhangs on lift shaft and
west elevation of factory
building
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19
Remove demolition rubble from roof slab and
provide drainage/waterproofing of newly
exposed roof slab to prevent corrosion of
reinforcement
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Removal of Demolition
Rubble/Waterproofing of Roof Slab
Demolition rubble to be
removed from the roof
Ensure that the recently exposed
concrete roof slab is provided with
drainage and waterproofed, at
locations where the slab has been
damaged, to prevent ingress of
water to the building structure
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Priority Actions
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Problems Observed
ITEM 1: Structural drawings provided do not match the as-constructed structure.
ITEM 2: Verify concrete stresses and in-situ strengths for concrete columns
ITEM 3: Cracking in beams on the underside of 2nd and 5th floors
ITEM 4: Column in North West corner - confirm vertical load path throughout
building and stress in column at ground floor level
ITEM 5: Exposed reinforcement to slab overhangs in future lift shaft and front
elevation
ITEM 6: Remove demolition rubble from roof slab and provide
drainage/waterproofing of newly exposed roof slab to prevent
corrosion of reinforcement
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Priority 1(Immediate - Now)
Item 1 and actionsStructural drawings provided do not match the as-constructed structure
particularly with respect to column locations and the inclusion of building
movement joints.
• None required
Priority 2(within 4-months)
• Factory Engineer to prepare as-built structural drawings.
• A Detailed Engineering Assessment of the Factory is to be
commenced, see attached scope.
Priority 3(within 6-months)
• Produce and actively manage a loading plan for all floor plates
within the factory giving consideration to floor capacity and
column capacity.
• Detailed Engineering Assessment to be completed.
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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.
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
Detail Engineering Assessment
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Priority 1(Immediate - Now)
Item 2 and actionsVerify concrete strengths and in-situ concrete stresses in all
columns within the building at ground floor.
Priority 2(within 4-months)
• Factory Engineer to review design, loads and columns stresses
in area identified above.
Priority 3(within 6-months)
• Produce and actively manage a loading plan for all floor plates within the
factory giving consideration to floor capacity and column capacity.
• Continue to implement load plan
• Verify insitu concrete stresses either by cores or existing cylinder
strength data for the identified columns
• None required
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Priority 1(Immediate - Now)
Item 3 and actionsCracking in beams on the underside of 2nd and 5th floors
Priority 2(within 4-months)
• Sections of plaster finish to beams to be removed to investigate
if cracks penetrate the building structure.
Priority 3(within 6-months)
• Building Engineer to carry out design check on beams to
confirm that these cracks are non-structural.
• Building Engineer to prepare Allowable Floor Loading Plans
• Remedial works to cracking to be carried out.
• None required
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Priority 1(Immediate - Now)
Item 4 and actionsColumn in North West corner - confirm vertical load path throughout
building and stress in column at ground floor level
• None required
Priority 2(within 4-months)
• Building Engineer to complete a design check on the column and transfer beam in the retail unit in the north west corner and if required, prepare strengthening measures.
• Building Engineer to assess if column is a ‘key’ structural element and as such should be provided with a protective barrier
Priority 3(within 6-months)
• None required
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Priority 1(Immediate - Now)
Item 5 and actionsExposed reinforcement to slab overhangs in future lift
shaft and front elevation
• None required
Priority 2(within 4-months)
• Engineer to inspect damaged structure and propose a suitable
repair.
Priority 3(within 6-months)
• Repair works to be completed
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Priority 1(Immediate - Now)
Item 6 and actionsRemove demolition rubble from roof slab and provide drainage/waterproofing of
newly exposed roof slab to prevent corrosion of reinforcement
• None required
Priority 2(within 4-months)
• Remove demolition rubble from roof slab.
• Building Engineer to inspect damaged areas of roof slab
following demolition and propose suitable repair/drainage
system.
Priority 3(within 6-months)
• Roof drainage system to be installed and concrete slab to be
waterproofed at locations where the slab has been damaged.