Understanding Strip Footings
A strip footing is a long, continuous concrete footing that runs under a wall or under a line of closely spaced columns. It spreads that line of load over a strip of soil wide enough to carry it. Because it’s continuous, it’s also called a continuous footing. When it supports a wall, it’s commonly called a wall footing, which is the term ACI 318 uses.
Where are strip footings used?
- Load-bearing walls in houses and low-rise buildings
- Basement and retaining walls
- Boundary and partition walls
- Rows of closely spaced columns, where separate pads would overlap or nearly touch
Strip Footing vs Pad Footing
| Ленточный фундамент | Подушка (Isolated) Фундамент | |
|---|---|---|
| опоры | Walls or a row of columns | One column |
| Load type | мы сосредоточимся на том, как рассчитать боковое давление грунта, действующее на заднюю поверхность подпорной стены из-за трех типов наложенных друг на друга нагрузок. (кН/м или тысячи фунтов/фут) | Точечная нагрузка |
| Форма | Long and continuous | Square or rectangular |
| Structural action | Mostly one-way bending across the width | Two-way bending |
| Typical design basis | Per unit length | Whole footing |
Проще говоря, a pad footing collects load from one point, while a strip footing collects load along a line.
Common types of strip footing
- Plain (масса) concrete strip footing: unreinforced. Suitable for light loads and good soil.
- Reinforced concrete strip footing: has transverse reinforcement (and usually longitudinal bars) to handle bending, heavier loads, or variable soil.
- Wide strip footinграмм: widened to lower bearing pressure on weaker soil.
- Stepped strip footing: steps down along its length to follow sloping ground.
Designing Strip Footings in SkyCiv
Strip footing was one of the most requested features for Дизайн фонда SkyCiv. It’s now available in v4.0.0. This release also brings a full UI/UX overhaul, so the module is cleaner and quicker to use.
Model it your way
- Live 3D graphics: the model updates as you change inputs.
- Complete inputs: геометрия, материалов, свойства почвы, reinforcement layout, and load cases and combinations.
- Footing type: reinforced concrete or mass (unreinforced) бетон.
- Wall type: reinforced concrete or masonry.
- Detailed reinforcement: full layout for both the footing and the wall, including double-layer wall reinforcement and dowel bars.
- Rebar anchorage: choose the anchorage type.
- Flexible loading: add multiple loads and customize load combinations.
Design Verification
Designs currently follow ACI 318-19, with more design codes coming soon.
- Проверка стабильности: soil bearing, эксцентричность, переворачивание, и скользящий
- Проверка прочности: сдвиг, армирование, изгиб, и подшипник
- Detailing checks: geometry and reinforcement layout
Отчеты о дизайне
Every design produces a detailed report. You can view it in the browser, download it, or save it to the cloud with SkyCiv Project Manager so your calculations are always easy to find.
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Разработчик продукта
Бакалавр наук (гражданского), Магистр (гражданского)
