An unreinforced masonry shear wall designed to Eurocode 6 checks characteristic shear strength using a formula that, like the IS 1905 example covered elsewhere in this series, scales with coexisting vertical compressive stress — but EN 1996 applies its own specific coefficients and a cap tied to the masonry unit's own shear strength characteristic.
Every check above runs automatically inside the Structyze Masonry Shear Wall module — this particular module is part of the full desktop catalogue rather than the free browser trial, since the trial only carries a curated flagship set. You can still try the free trial modules right now to see the same calculation style in action on RCC Beam, Column, Slab and a handful of others.
The Example We'll Use
- Wall: 215 mm calcium silicate brick masonry, length 2.5 m, height 2.8 m
- Initial shear strength f_vk0: 0.30 MPa (characteristic value for this unit-mortar combination)
- Design shear force V_Ed: 38 kN, coexisting design compressive stress: 0.45 MPa
Working Through It
Characteristic shear strength f_vk = f_vk0 + 0.4 × coexisting compressive stress = 0.30 + 0.4 × 0.45 = 0.48 MPa, checked against EN 1996's upper cap of 0.065 × f_b (unit normalized compressive strength) — the calculated value falls below the cap, so it governs directly.
Design shear strength f_vd = f_vk / γ_M = 0.48 / 2.0 = 0.24 MPa.
Design shear resistance V_Rd = f_vd × compression zone length × thickness (accounting for the portion of the wall actually in compression under combined axial and overturning effects, taken here as the full length since net tension doesn't develop) = 0.24 × 2500 × 215 × 10⁻³ = 129 kN.
Utilization: 38 / 129 = 0.29.
What Governs, and Why
Shear resistance clears comfortably at utilization 0.29, with the coexisting compressive stress contributing meaningfully to the available shear strength — directly paralleling the IS 1905 example elsewhere in this series, reinforcing that this is a shared structural principle across unreinforced masonry codes generally, not a quirk specific to any one code's formulation.
Where Structyze Takes Over
Every check above runs automatically inside the Structyze Masonry Shear Wall module — this particular module is part of the full desktop catalogue rather than the free browser trial, since the trial only carries a curated flagship set. You can still try the free trial modules right now to see the same calculation style in action on RCC Beam, Column, Slab and a handful of others.
For Masonry Shear Wall and the rest of the full catalogue — 80+ components across RCC, Steel, Composite, Timber, Masonry and more, across 20+ design codes — buy the full Structyze desktop app or see everything it does on the Software page.
Quick FAQ
Why does Eurocode 6 cap the shear strength formula at a value tied to the masonry unit's own strength?
Without an upper cap, the formula's compressive-stress-dependent term could theoretically predict unrealistically high shear strength under very high axial load, exceeding what the masonry unit itself could actually deliver before a different failure mode (like unit crushing) intervenes — the cap keeps the formula physically realistic across its full range of application.
Does the full wall length always act in compression for this calculation?
Not necessarily — for a wall experiencing significant overturning moment alongside shear, part of the wall length can go into net tension (which unreinforced masonry can't resist), reducing the effective compression zone length used in the shear resistance calculation below the wall's full physical length.
Final Thoughts
Two different masonry codes, IS 1905 and Eurocode 6, independently arrive at the same underlying logic for unreinforced shear strength — shear resistance that scales with vertical compressive stress, capped at a physically sensible limit. A good sign that this reflects genuine masonry behavior rather than an arbitrary code-specific formula.