Precast Slab Diaphragm Check

EN 1992-1-1 & SCI P351 Analysis
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Structural Diaphragm Action (Plan View)
Precast Slab (Length L, Depth D) Lateral Design Load (kN/m) Max Shear (V_Ed) Max Shear (V_Ed) Internal Truss Analogy (Strut)

Design Parameters

Slab & Bay Geometry
m
m
m
m
mm
Structural Topping (SCI P351)
Column & Support Dimensions
mm
mm
Material Properties
MPa
Lateral Loading
kN/m²
m
m
Interface Shear (EN 1992-1-1 Cl 6.2.5) ?
Ult. Lateral UDL 0.00 kN/m
Design Shear (V_Ed) 0.00 kN

1. Plain Grouted Joint

Eff. Thickness (Slab + Topping)0 mm
Joint Shear Capacity (V_Rd)0.00 kN
Design Ratio (V_Ed / V_Rd)
0.00PASS

2. Truss Model (Strut Action)

Strut Angle (θ)0.00 rad
Strut Force (F_slab)0.00 kN
View Intermediate Values
Area (Diag), Ac,diag0 mm²
Area (Ortho), Ac,ortho0 mm²
Diag. Bearing Width (bc)0.00 mm
Diagonal Resistance (F_cu,diag)0.00 kN
Diagonal Ratio
0.00PASS
Orthogonal Resistance (F_cu,ortho)0.00 kN
Orthogonal Ratio
0.00PASS

3. Interface Shear (Cl 6.2.5)

Unreinforced Cap. (V_Rdi,plain)0.00 kN
Unreinforced Ratio
0.00PASS
Max Interface Limit (V_Rdi,max)0.00 kN
View Intermediate Values
Cohesion (c)0
Friction (μ)0
f_ctd0 MPa
f_cd0 MPa
f_yd0 MPa
Joint Area (Aj)0 mm²
Steel Area (As)0 mm²
Strength red. (ν)0

Interface Check Failed

Even with dowels, the capacity is insufficient. Consider:

  • Decrease Spacing: Decrease the dowel spacing or use a larger diameter to provide more shear friction area ($A_s$).
  • Enhance Concrete Adhesion: Improve the interface roughness.
  • Verify Limits: If $V_{Rdi}$ is capped by $V_{Rdi,max}$, adding steel won't help. Increase the slab effective depth ($t_c$), add a structural topping, or increase concrete strength ($f_{ck}$).
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