Overview
- Primary topic
- Laminated glass
- Engineering basis
- Structural glass
- Review status
- Project-specific verification required
Why the Build-Up Matters
The selected 6 + 1.52 + 6 pane uses two annealed glass plies with a Family 1 PVB interlayer. VitraLab applies the selected wind-duration equivalent-thickness basis rather than treating the total laminated depth as one monolithic pane.
Equivalent-Thickness Output
For the selected wind condition, the run reported ω = 0.300, heq;w = 10.140 mm and equal ply stress thicknesses of 11.238 mm.
Engineering Review
Result Interpretation
The positive and negative wind cases produced equal response magnitudes with opposite signs. The governing ULS stress ratio was 0.225 and the governing SLS deflection ratio was 0.078, so both checks passed for this illustrative input set.
Project Application
A project calculation still requires the actual wind actions, pane support, interlayer family, load duration, glass treatment, surface condition and serviceability requirements to be confirmed.
Worked Example: Laminated Glass 6 / 1.52 / 6
Values below are an illustrative software example, not independent validation data.
- Pane size
- 1000 × 1500 mm
- Orientation and support
- Vertical, four edges supported
- Build-up
- 6 + 1.52 + 6 laminated glass
- Glass and interlayer
- Annealed float glass, Family 1 PVB
- Applied action
- +1.0 / −1.0 kN/m² wind
- Analysis route
- Auto / EN 16612 criteria
- Governing combination
- 1.5 Wind
- Design action
- 1.500 kN/m²
- Calculated response
- 5.626 N/mm² stress
- Utilization or ratio
- 0.225 utilization
- Governing combination
- Wind
- Design action
- 1.000 kN/m²
- Calculated response
- 1.202 mm deflection
- Utilization or ratio
- 0.078 of 15.385 mm limit
The result applies only to the stated inputs. Changing pane size, supports, interlayer assumptions, load duration or glass treatment changes the response.
Example VitraLab Result Presentation
The worked values remain available as crawlable text above. This related VitraLab figure shows how ULS stress and SLS deflection are separated in the result tables.
Frequently Asked Questions
Is 6 + 1.52 + 6 treated as 13.52 mm monolithic glass?
No. The laminated response uses the selected action-dependent equivalent-thickness basis rather than treating the complete build-up as one monolithic thickness.
Why do pressure and suction have equal magnitudes here?
The example uses equal positive and negative wind inputs on the same pane and support arrangement, so the calculated magnitudes match while their signs reverse.
Does this worked result validate every 6 + 1.52 + 6 pane?
No. It documents one software run. Project actions, supports, glass treatment, interlayer properties and serviceability requirements must be checked separately.
Engineering content is prepared and maintained by VitraLab Engineering. Worked examples show how the current calculator treats a defined case; they do not replace project-specific verification.