免费梁荷载计算器
计算梁的线荷载（磅/线性英尺），输入跨度、贡献宽度和荷载进行结构分析。
Distance from beam to midpoint of next support on each side
Typical floor: 10-15 psf, roof: 12-20 psf
Residential floor: 40 psf, deck: 40 psf, roof: 20 psf
Load per Linear Foot
440 lbs/ft
Load per Linear Foot vs Beam Span
公式
## How to Calculate Beam Loading ### Formula **Load per Linear Foot = (Dead Load + Live Load) × Tributary Width** **Total Load = Load per Linear Foot × Span** **Support Reaction = Total Load / 2** (for a uniformly loaded simple beam) Tributary width is the distance from the beam centerline to the midpoint between the beam and the next parallel support on each side. This calculation assumes a uniformly distributed load on a simply supported beam.
计算示例
A 16 ft beam with 8 ft tributary width, 15 psf dead load, 40 psf live load.
- 01Total load = 15 + 40 = 55 psf
- 02Load per linear foot = 55 × 8 = 440 lbs/ft
- 03Total beam load = 440 × 16 = 7,040 lbs
- 04Reaction per support = 7,040 / 2 = 3,520 lbs
常见问题
What is tributary width?
Tributary width (or tributary area width) is the distance that a beam supports, measured perpendicular to the beam. It extends halfway to the next support on each side.
What is a typical residential floor live load?
40 psf for living areas and bedrooms. 100 psf for decks with public access. 20 psf for roof live loads (varies by location). These are minimum code requirements.
How do I size a beam from these loads?
Beam sizing requires calculating required section modulus based on bending moment (M = wL²/8 for uniform load). Consult an engineer or span tables for actual beam selection.
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