all weather fashions ltd (10451) m-yew fashion ltd (9859...
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All Weather Fashions Ltd (10451)
M-Yew Fashion Ltd (9859)
Crystal Apparel (11311) 52, Shahid Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1213, Bangladesh
(+23.774852N, 90.398619E)
03.MARCH.2014
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
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
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.
Item No. Observation Recommended Action Plan Recommended Timeline
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.
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.
Immediate – Now
2
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.
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.
6-weeks
3
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.
Develop live load plans for each usable floor and incorporate fail
safe indication system.
Consider whether to demolish the unused floors.
6-months
4Storage height of fabric in storage rooms on 3/F and 6/F appear
to be excessive.
Immediately reduce stacking height of fabric rolls to ensure total
load does not exceed 3.0kPa.Immediate – Now
5Storage height of fabric in storage rooms on 3/F and 6/F appear
to be excessive.
Mark the maximum allowable height of fabric stacking to ensure
full compliance.6-weeks
Item No. Observation Recommended Action Plan Recommended Timeline
6
Poor quality construction at entire main stairwell location has
resulted in cracking of columns, spalling of concrete, and
corrosion of rebars.
Carry out full building survey to identify all areas of concrete
damage, and mark on site with coloured spray paint.Immediate – Now
7
Poor quality construction at entire main stairwell location has
resulted in cracking of columns, spalling of concrete, and
corrosion of rebars.
Provide propping to the damaged concrete areas (if slab and beam
and column) 6-weeks
8
Poor quality construction at entire main stairwell location has
resulted in cracking of columns, spalling of concrete, and
corrosion of rebars.
Hack away the damaged concrete and expose reinforcement to
check for corrosion
Carry out replacement of reinforcement and proper regrouting of
structural elements
6-months
9Several areas at 4/F, 6/F and 8/F have significant water damage
at wall and ceiling and beam locations.
Provide propping to the damaged concrete areas (if slab and beam
and column) 6-weeks
10Several areas at 4/F, 6/F and 8/F have significant water damage
at wall and ceiling and beam locations.
Hack away the damaged concrete and expose reinforcement to
check for corrosion
Carry out replacement of reinforcement and proper regrouting of
structural elements.
6-months
11 Roof appears not to have any waterproofing system applied.Consider removing existing screed, applying a new waterproofing
membrane and reapplying the screed.6-months
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