all weather fashions ltd - fair factories...
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All Weather Fashions Ltd 52, Shahid Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1213, Bangladesh
(+23.774852N, 90.398619E)
3rd March 2014
1
Identified Priority 1 Concerns
AVERAGE INTERNAL COLUMN STRESS (*)
(*) Instructions: Only overwrite red valuesFactory name
CASE I CASE II
No. Floors
supported INCL
ROOF
10 max. 20 (including roof)
Selfweight Finishes
Apparent
Live Load
Code Live
Load
Basement (Y/N) yes
Construction date Loading on roof 5.1kPa 1.5kPa 0.2kPa 0.2kPa
Loading on 8th 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Column size 0.30 x 0.46 m Loading on 7th 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Grid (LxT) 5.80 x 4.57 m Loading on 6th 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Beam L 0.25 x 0.53 m Loading on 5th 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Beam T 0.25 x 0.53 m Loading on 4th 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Slab thickness m Loading on 3rd 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Floor-ceiling height m Loading on 2nd 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Loading on 1st 5.1kPa 1.0kPa 2.0kPa 3.0kPa
Hyperstatic effect 10% Loading on GF 5.1kPa 2.5kPa 2.0kPa 3.0kPa
Basement 5.10 1.0kPa 2.0kPa 3.0kPa
Concentated load 5.0 kN 5.10 1.0kPa 2.0kPa 3.0kPa
on column 5.10 1.0kPa 2.0kPa 3.0kPa
Column agregate Brick 5.10 1.0kPa 2.0kPa 3.0kPa
Rebar % 4.30 % 5.10 1.0kPa 2.0kPa 3.0kPa
5.10 1.0kPa 2.0kPa 3.0kPa
Limits (MPa) X Y 5.10 1.0kPa 2.0kPa 3.0kPa
9.4 11.9 5.10 1.0kPa 2.0kPa 3.0kPa
5.10 1.0kPa 2.0kPa 3.0kPa
Apparent w orking stress 17.0 MPa 5.10 1.0kPa 2.0kPa 3.0kPa
Case II w orking stress 18.9 MPa
kN
Concrete stress is greater than Z MPa (FOS less than 1.25). RED (See guidance)
2.895
Total unfactored
column load (kN)2373
All Weather Fashions
52 Shahid Tajuddin Ahmed Sarani
Mohakhali, Dhaka 1213
before 2005
0.152
Z
14.4
Based on the load rundown analysis following
the agreed minimum design live load
assignment, the columns seem significantly
insufficient in carrying the dead and live loads
from the 9 storey building, giving a firm RED
warning. The building was constructed in year
2000, with brick aggregate, with total of 9
storeys (including roof) and 1 full basement
floor.
1st Priority 1 Concern
Column Load Exceeds
Allowable Limit by Code
AVERAGE INTERNAL COLUMN STRESS (*)
(*) Instructions: Only overwrite red valuesFactory name
CASE I CASE II
No. Floors
supported INCL
ROOF
10 max. 20 (including roof)
Selfweight Finishes
Apparent
Live Load
Code Live
Load
Basement (Y/N) yes
Construction date Loading on roof 5.1kPa 1.5kPa 0.2kPa 0.2kPa
Loading on 8th 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Column size 0.30 x 0.46 m Loading on 7th 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Grid (LxT) 5.79 x 4.57 m Loading on 6th 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Beam L 0.25 x 0.53 m Loading on 5th 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Beam T 0.25 x 0.53 m Loading on 4th 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Slab thickness m Loading on 3rd 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Floor-ceiling height m Loading on 2nd 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Loading on 1st 5.1kPa 1.0kPa 1.0kPa 3.0kPa
Hyperstatic effect 10% Loading on GF 5.1kPa 2.5kPa 1.0kPa 3.0kPa
Basement 5.10 1.0kPa 2.0kPa 3.0kPa
Concentated load 5.0 kN 5.10 1.0kPa 2.0kPa 3.0kPa
on column 5.10 1.0kPa 2.0kPa 3.0kPa
Column agregate Brick 5.10 1.0kPa 2.0kPa 3.0kPa
Rebar % 4.30 % 5.10 1.0kPa 2.0kPa 3.0kPa
5.10 1.0kPa 2.0kPa 3.0kPa
Limits (MPa) X Y 5.10 1.0kPa 2.0kPa 3.0kPa
9.4 11.9 5.10 1.0kPa 2.0kPa 3.0kPa
5.10 1.0kPa 2.0kPa 3.0kPa
Apparent w orking stress 15.1 MPa 5.10 1.0kPa 2.0kPa 3.0kPa
Case II w orking stress 18.9 MPa
kN
Concrete stress is greater than Z MPa (FOS less than 1.25). RED (See guidance)
Z
14.4
Total unfactored
column load (kN)2108
All Weather Fashions
52 Shahid Tajuddin Ahmed Sarani
Mohakhali, Dhaka 1213
before 2005
0.152
2.896
Due to the RED warning, the live loads have
been further reduced to a minimum of 1.0kPa.
Although actual live loads may be less than
1.0kPa, it is unsafe to assume any design
loading less than 1.0kPa. Following this, the
result remains RED.
Given that this building has been approved for
construction up to 13 floors, the structure in its
current state already appears to be insufficient
for its given purpose.
1st Priority 1 Concern
Column Load Remains
Unsatisfactory When Assuming
Actual Applied Loads
Each roll of fabric is
estimated to be
approximately 35kg.
As they are stacked
10 rolls high, and
arranged 6 rolls per
layer, the weight of
each layer is approx
210kg, resulting in a
total weight of
2,100kg (20.6kN) per
stack.
Based on a plan area
of 1.4mx1.4m per
stack, the equivalent
live load per stack is
estimated to be:
20.6kN/(1.4x1.4)m2 =
10.5kPa.
The allowable live
load is max. 3.0kPa
2nd Priority 1 Concern
Excessive Storage Height of
Fabric storage area on Level 3
Each roll of fabric is
estimated to be
approximately 30kg.
As they are stacked
7 rolls high, and
arranged 7 rolls per
layer, the weight of
each layer is approx
210kg, resulting in a
total weight of
1,470kg (14.4kN) per
stack.
Based on a plan area
of 1.4mx1.4m per
stack, the equivalent
live load per stack is
estimated to be:
14.4kN/(1.4x1.4)m2 =
7.4kPa.
The allowable live
load is max. 3.0kPa
3rd Priority 1 Concern
Excessive Storage Height of
Fabric storage area on Level 6
Identified Priority 3 Concerns
1st Priority 3 Concern
In the main circulation stairwell, the existing vent shaft had been
cancelled, and modification to the staircase had taken place by filling
in the half-landing slab to the perimeter of the building. However, the
construction quality is very poor, and spalling of the slab has
occurred, including rusting of the rebars, and also the deep cracking
of the column at 8/F and 7/F half landing.
It is planned to construct brick wall to enclose the entire staircase.
Along the original slab edge.
Main Staircase structural
modifications exhibit major defects
2nd Priority 3 Concern
In particular on the 8/F ceiling (the roof slab), there are many areas
where water seepage or prolonged soaking of the slab has caused
water damage either by rebar corrosion, leading to spalling or
loosening of plaster. Other areas, such as the ceiling below the toilets
at the very rear of the building on each floor also exhibits water
damage (6/F). On some floors, walls also have water damage (4/F).
This should be repaired
Dampness and water ingress has caused
water damage at several locations
3rd Priority 3 Concern
Judging by the water ingress
at 8/F ceiling, it may be
assumed that no waterproof
membrane has been applied
at the roof level of the building.
This means that any cracks in
the surface finishes on the roof
will allow water to seep into
the concrete slab beneath the
finishes, and cause long-term
soaking of the slab, causing
the defects as observed on 8/F
ceiling.
Roof Floor does not appear to have any
waterproof membrane to protect lower floor
from water damage
Priority Actions
Problems Observed Summary
ITEM 1: (1st Priority 1) Preliminary load take-down calculations suggest that structure does not comply with the BNBC regulations with regard to required design loading, and that even using significantly reduced loading still results in a structure which is incapable of sustaining the applied loads. ITEM 2: (2nd and 3rd Priority 1) Storage height of fabric in storage rooms on 3/F and 6/F appear to be excessive ITEM 3: (1st Priority 3) Poor quality construction at entire main stairwell location has resulted in cracking of columns, spalling of concrete, and corrosion of rebars. ITEM 4: (2nd Priority 3) Several areas at 4/F, 6/F and 8/F have significant water damage at wall and ceiling and beam locations. ITEM 5: (3rd Priority 3) Roof appears not to have any waterproofing system applied.
Priority 1
(Immediate – Now)
• Suspend all activities in the building
• Discuss with owner on the possibility of
shutting down at least 4 (four) floors of the
building to reduce loading to within limits
Item 1 and actions Preliminary load take-down calculations suggest that structure does not comply with the BNBC
regulations with regard to required design loading and that even using significantly reduced loading
still results in a structure which is incapable of sustaining the applied loads.
Priority 2
(within 6 – weeks)
• Building engineer to carry out thorough load
checking of the entire structure, including
slabs, beams and columns based on BNBC
• Carry out intrusive testing of structure to
determine actual concrete and rebar strength
Priority 3
(within 6-months)
• Develop live load plans for each usable floor
and incorporate fail safe indication system
• Consider whether to demolish the unused
floors
Item 2 and actions
Storage height of fabric in storage rooms on 3/F and 6/F appear to be excessive
Priority 1
(Immediate – Now)
• Immediately reduce stacking height of fabric
rolls to ensure total load does not exceed
3.0kPa
Priority 2
(within 6 – weeks)
• Mark the maximum allowable height of fabric
stacking to ensure full compliance
Priority 3
(within 6-months)
• Not required
Item 3 and actions
Poor quality construction at entire main stairwell location has resulted in cracking of columns,
spalling of concrete, and corrosion of rebars.
Priority 1
(Immediate – Now)
• Carry out full building survey to identify all
areas of concrete damage, and mark on site
with coloured spray paint
Priority 2
(within 6 – weeks)
• Provide propping to the damaged concrete
areas (if slab and beam and column)
Priority 3
(within 6-months)
• Hack away the damaged concrete and
expose reinforcement to check for corrosion
• Carry out replacement of reinforcement and
proper regrouting of structural elements
Item 4 and actions
Several areas at 4/F, 6/F and 8/F have significant water damage at wall and ceiling and beam
locations.
Priority 1
(Immediate – Now)
• Not required if done as part of Item 3
Priority 2
(within 6 – weeks)
• Provide propping to the damaged concrete
areas (if slab and beam and column)
Priority 3
(within 6-months)
• Hack away the damaged concrete and
expose reinforcement to check for corrosion
• Carry out replacement of reinforcement and
proper regrouting of structural elements
Item 5 and actions
Roof appears not to have any waterproofing system applied.
Priority 1
(Immediate – Now)
• Not required
Priority 2
(within 6 – weeks)
• Not required
Priority 3
(within 6-months)
• Consider removing existing screed, applying
a new waterproofing membrane and
reapplying the screed