What is a Load Path?
A load path is the continuous route through which loads travel from where they're applied down to the foundation and ground. Every point along this path must be structurally connected and have enough capacity to carry the load safely.
A load path is the continuous structural route — slab/roof, beam, column, foundation, soil — through which loads are transferred; the load reaching a given member can be found with P = w × A.
- 1↓Floor/Roof SlabLoad is applied here (dead + live)
- 2↓BeamCollects and carries the slab load
- 3↓ColumnCarries the beam load downward
- 4↓FoundationTransfers the column load to the ground
- 5SoilUltimately resists the load (bearing capacity)
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Step-by-step worked examples
A floor slab carries 4 kN/m² of combined dead and live load over a 5 m × 4 m tributary area for an interior column. Find the load transferred to the column.
A = 5 × 4 = 20 m² P = w × A = 4 × 20 = 80 kN
A roof carries a 1.5 kN/m² snow load over a 30 m² tributary area for an edge column. Find the load.
P = w × A = 1.5 × 30 = 45 kN
A beam carries a 6 kN/m² total load over a 3 m tributary width and 6 m span (A = 18 m²). Find the load at each support.
Total load = 6 × 18 = 108 kN Each support = 108 / 2 = 54 kN
Flashcards
Quick quiz
Q1.What is the primary purpose of tracing a structure's load path?
Q2.In a typical gravity load path, which element usually comes right after the beam?
Q3.A column's tributary area is 5 m × 4 m with a load of 4 kN/m². What load reaches the column?
Q4.Which term describes a break in a load path?
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Common mistakes
Assuming only vertical gravity loads matter. — Correct: Lateral loads like wind and seismic need their own load path too — diaphragm to shear wall to foundation.
Ignoring overlaps when computing tributary areas. — Correct: Tributary areas must be calculated carefully to avoid double-counting or under-counting load.
Treating the load path as purely one straight line downward. — Correct: Loads can redistribute laterally through diaphragms before continuing down.
Assuming any member can absorb extra load. — Correct: Every member has a fixed capacity; discontinuities cause localized overstress and potential failure.
FAQ
What is a load path in structures?
A load path is the continuous structural route — from slab or roof through beams, columns, foundation, and into the soil — that carries applied loads safely to the ground.
What is the load path formula?
The load reaching a member is P = w × A, where w is the distributed load and A is that member's tributary area.
What are examples of load paths?
A roof load traveling through a beam, into a column, then into the foundation and soil is a classic vertical load path example.
How do you calculate a load path?
Multiply the distributed load by each member's tributary area, then trace that force down through beam, column, and foundation to the ground.