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Steel Modular Forms
Modular forms, also known as Versatile forms have various
dimensions.
The surface of these forms is made of steel plates with a
thickness of 3mm.
The punched straps that are welded around the forms are (60 mm X
5 mm)/ (50mm X5 mm) and the distance between the holes on them
is 5 centimeters.
Punching holes on the forms straps with the same distance from
each other makes it easier to assemble all kinds of form with
different dimensions.
This increases the flexibility of forms. Another advantage is
that the panels are easily connected with wedges and clamps. The
stiffener, which is made of 4mm sheets, increases the load
capacity of each panel.
The modular forms can be divided by 5. So their width range from
10 cm to 50 cm and their length are 100,150,200 Centimeters. In
addition to these dimensions,
in special conditions according to
the project needs, the dimensions
can be changed and Boozarjomehr
industrial group is capable of producing forms in
various dimensions.
Steel modular forms can be
used
more than
150 times.
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Forms
Dimensions
(cm) |
Forms weight (kg) |
|
PL 60x5mm |
PL 50x5mm |
|
100x10
100x15
100x20
100x25
100x30
100x35
100x40
100x45
100x50
150x10
150x15
150x20
150x25
150x30
150x35
150x40
150x45
150x50 |
7
9
10.2
12
13.5
15
18
19.5
21
10
13
15
17.5
20.5
22.5
26.5
28.5
31 |
6
8
9
11.3
13
14.4
17
18.5
19.2
9.4
11.9
14
16.8
19
21.7
25
27.1
29.1 |
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“Boozarjomehr Industrial Group” has modeled a 100X50Cm
modular form which has 5 or 6 stiffeners with 5 mm thickness to
examine the different strength in modular forms. They are used
SAP2000 software and Shell element for modeling.
In this forms, the followed equation, which is in the ACI code
has been used to calculate the concrete pressure:
In above equation, the speed of concrete pouring is according to
meter per hour, temperature (tc) is according to the centigrade
degree and Concrete pressure is according to the kilo-Pascal.
Supposed to the R=1.5 m/hr, tc =10 C, the concrete pressure will
be P=50Kpa=0.5Kg/Cm2
Each form has been studied in two conditions:
a)
Form is relied on three wedges in length and two wedges in wide.
b)
Except on mentioned wedge in (a) item, two pipes are supported
form in top and bottom.
Concrete pressure is exerted on node elements of SHELL such a
node bar.
And attention to the dimension of elements on the
surface of 5X5 cm form,
the load of inmost nodes will be 12.5Kg
and load of side nodes will be 6.25Kg.
In all cases, forces are governed in the node number 380. In
this node, and
forces are created a tensile/ bearing stress in
the stiffener sheet but the
derived stress of force is shearing
stress. In addition, bending moments, and, are acting around the
weak axis of stiffener and create considerable stress
but
moments of Mx is acted around strong axis other although the
derived
stress of it is insignificant. Consequently, the
calculation of maximum stress
is as followed: Summery of the
above analysis is as follows:
a) Form is relied on three wedges in length and two wedges in
wide:
1.Maximum Deflection:
-
For
forms with 6 centimeters stiffeners:
-
For
forms with 5 centimeters stiffeners:
-
Additional deflection:
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2.Maximum Stress:
For forms with 6 centimeters stiffeners:
For forms with 5 centimeters stiffeners:
Additional Stress:
b) Except on mentioned wedge in (a) item, two pipes are supported
form in top and bottom.
1.Maximum Deflection:
-
For
forms with 6 centimeters stiffeners:
-
For
forms with 5 centimeters stiffeners:
-
Additional deflection:
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2.Maximum Stress:
For forms with 6 centimeters stiffeners:
For forms with 5 centimeters stiffeners:
Additional Stress:
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