The composite decks consist of profiled steel sheeting and reinforced concrete. The composite method of deck construction was first introduced in North America and is increasingly  being used in Europe and in Greece,
During the last years the use of composite decks in civil engineering structures has been increased due to the advantages that it offers with respect to more traditional solutions. The benefits from the usage of composite decks can be summarized in the following: 

  • Less construction time is required. 
  • The usage of wooden formwork is avoided. 
  • They can be used to bridge larger spans. 

The main component of the composite decks is the profiled steel sheeting which during the construction phase, functions as formwork supporting the wet concrete. After the hardening of the concrete, the composite decks undertake the additional imposed loads. Usually, a light reinforcement is applied to the upper surface of the composite deck which protects the concrete from cracking. In the case that a continuous beam structural system ia adopted; this reinforcement also gives to the composite deck the ability to undertake hogging bending moments at the positions of the supports.

Thickness
Weight
Cross section area
Second moment of inertia
Section modulus
t (mm)
G (kg/m)
A (cm²)
I y (cm⁴)
W y (cm³)
0.75
7.36
9.57
82.51
20.68
0.80
7.85
10.15
88.00
22.11
1.00
9.81
12.72
110.42
27.74
1.25
12.27
15.98
138.32
34.67

Table 1: Geometrical and inertial properties of the SYMDECK73 trapezoidal steel sheeting.


Thickness
Weight
Cross section area
Second moment of inertia
Section modulus
t (mm)
G (kg/m²)
A (cm²/m)
I y (cm⁴/m)
W y (cm³/m)
0.75
9.81
12.76
110.01
27.57
0.80
10.47
13.533
117.33
29.48
1.00
13.08
16.96
147.22
36.99
1.25
16.36
21.31
184.43
42.23

Table 2: Geometrical and inertial properties of the SYMDECK73 trapezoidal steel sheeting per meter of width of cross section.

SYMDECK DESIGNER 2

The new version of the SYMDECK DESIGNER 2 software, that was created for the design of continuous composite slabs systems with trapezoidal steel profile SYMDECK73, is fully harmonised with the provisions of the current Eurocodes (EN 1993-1-3:2006, EN 1993-1-5:2006, ΕΝ 1994.01.01: 2005 and ΕΝ 1994.01.02: 2005), after being updated and enhanced in comparison with the previous version of SYMDECK DESIGNER.

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