From this site

One project, every trade

Each calculator adds its lines to a single estimate — consolidated BOM, schedule and cash-flow included.

Open My Project →

Excavation Bracing Strut Load Calculator

Estimate the axial load on a single strut in a braced excavation, from a design apparent earth pressure and the strut's tributary area.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
9.84 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Strut axial load

480 kN

Check your inputs

This is a simplified tributary-area estimate — real braced excavation design uses the full Peck/Terzaghi apparent pressure envelope for the specific soil profile, and should also check strut buckling capacity, connections, and wale bending, all outside this calculator's scope.

Running these inputs gives 480 kN as the strut axial load. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Add the equipment this sizes

This result is a specification — 480 kN — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Standard tributary-area method for braced excavation strut loads: strut load = design apparent lateral pressure x tributary height x horizontal strut spacing

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why is 'apparent' pressure different from the active pressure used for a retaining wall?
A braced excavation's wall movement pattern (restrained at each strut level, rather than free to rotate like a cantilever retaining wall) produces a different, empirically-derived pressure distribution — apparent pressure diagrams (from Peck's classic work) are typically rectangular or trapezoidal, not the triangular shape used for free-standing walls.
What determines tributary height for a given strut level?
Each strut level supports the wall area midway to the strut levels above and below it (or to the excavation surface/base for the topmost/bottommost struts) — essentially splitting the wall height into zones, each assigned to its nearest strut level.
Does this account for strut preloading?
No — many braced excavations preload struts to limit wall movement, which changes the actual measured strut loads from the theoretical tributary-area estimate. Field strut load monitoring is standard practice on real projects.