Design Parameters for Horizontal Bars (Concrete wall: EC2)

Tekla Structural Designer
Modified: 10 Nov 2022
2024
Tekla Structural Designer

Design Parameters for Horizontal Bars (Concrete wall: EC2)

For some of the horizontal bar parameters, additional user defined limits can be applied - where this is the case minimum and maximum values are specified in Design Settings > Concrete > Cast-in-place > Wall > Reinforcement Layout. These are considered in addition to the EC2 or NA recommendations.

Reinforcement area for a wall

There are two values that control the horizontal reinforcement area
  • Limiting minimum ratio of horizontal reinforcement area to gross concrete area, ρh,lim,min

  • Limiting maximum ratio of horizontal reinforcement area to gross concrete area, ρh,lim,max

   

The minimum area of horizontal reinforcement, Ash,min is an NDP1,

  • For design to the EC2 Recommendations, UK NA, Irish NA, Malaysian NA, Singapore NA and Finnish NA the recommendation is;

    Ash,min = max (0.25*Asv,prov, 0.001* Acg)

    where

    Asv,prov = Actual area of vertical reinforcement provided

    Acg = Gross area of the concrete wall

  • For design to the Norwegian NA the recommendation is;

    Ash,min = max (0.25*Asv, prov , 0.3* Acg *fctm/fyk )

  • For design to the Swedish NA the recommendation is;

    Ash,min = 0.25*Asv, prov

The minimum reinforcement ratio (of horizontal reinforcement area to gross concrete area), which will be the start point for the design, is specified in Design Settings, with the default being 0.002.

Minimum Horizontal Bar Spacing

Clear distance between bars2

scl,min ≥ max (k1* maximum bar diameter, 20mm, dg + k2)

Where dg is the maximum aggregate size.

k1 and k2 are NDP values,

  • For design to EC2 Recommendations, UK NA, Irish NA, Malaysian NA, Singapore NA and Swedish NA;

    k1 = 1.0, and k2 = 5 mm

  • For design to Finnish NA;

    k1 = 1.0, and k2 = 3 mm

  • For design to Norwegian NA;

    k1 = 2.0, and k2 = 5 mm

You are given additional control over the spacing by specifying a minimum clear spacing user limit in Design Settings.

Maximum Horizontal Bar Spacing

To satisfy the slab condition3 if "predominantly out-of-plane bending";

Limiting maximum horizontal spacing, scr,max= min (3*hw , 400 mm)

You are given control over this value by specifying a maximum centre spacing user limit in Design Settings.

   

Footnotes

1 EN 1992-1-1:2004 cl 9.6.3(1)
2 EN 1992-1-1:2004 Section 8.2(2)
3 EN 1992-1-1:2004 Section 8.2
Was this helpful?
Previous
Next