Concrete / Shear Wall
Shear Wall
Force distribution through vertical joints in precast concrete shear walls. Calculates e_res, l_eff, V_Ed and H_Ed for each fuge per load combination.
Method
This tool has not yet been independently verified by the Aztech team. Results should be checked before use in design.
Models a precast shear wall divided into elements by up to three vertical construction joints (fuger). All vertical loads — self-weight, distributed loads Psd1/Psd2, and point loads — are represented as resultants at the top of the wall. Diagonal skewlines connect each resultant to the centre of the support pressure zone (Lu_psd) at the base.
For each fuge the loads whose skewlines cross it are identified. The eccentricity of the combined horizontal force is:
e_res = Σ(H_i × e_i) / Σ(H_i)
where H_i = V_i × |x_lu − x_load| / h is the horizontal component and e_i is the height of the skewline crossing at the fuge (from the top of the wall).
The effective length over which the force is distributed uniformly:
l_eff = min(2 · e_res, 2 · (h − e_res))
The design shear and normal intensities at the fuge are then:
V_Ed = Σ(V_i) / l_eff H_Ed = Σ(H_i) / l_eff [kN/m]
These outputs feed directly into the Støbeskel Design tool. The required joint area is A_j = l_eff × t (wall thickness).
Reference: Betonelementbyggeriers statik, p. 145–151. Danish National Annex.
Figure
Live wall sketch with fuger, load bands, point loads, skewlines, and support zone geometry.
Input
Output
Enter values and press Calculate to see results.
References
Betonelementbyggeriers statik
Force distribution through vertical joints in precast concrete wall systems
§ p. 145–151 — e_res, l_eff, V_Ed, H_Ed
EN 1992-1-1 (EC2)
Design of concrete structures — general rules and rules for buildings