27m Steel Box Girder Footbridge: 131 Tons of Steel, One Clean Span

Steel box girder footbridge carries pedestrians over roads, rivers or railways. Below is data from an actual 27m-span pedestrian bridge project.

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Basic Specs

 

Item	Value
Bridge type	Steel box girder footbridge
Main span	27.0 m
Total length	~31.4 m
Deck width	~4.5 m
Longitudinal slope	5.0%
Camber	250 mm
Steel tonnage	131.2 t (Q235C + Q345qB)
Bearings	GJZ7400×69 (NR), 8 pcs
Piles	Φ1.0 m bored piles

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Material Quantities

 

Material	Quantity
Q235C steel	131.2 t
Q345qB steel	included
C40 concrete (abutment)	176.4 m³
C35 concrete (wing wall)	135.2 m³
C30 underwater (piles)	190.4 m³
C20 concrete (pile cap)	9.6 m³
C50 steel fiber deck	60 mm thick
Asphalt wearing course	50 mm thick
HRB400 rebar	3.5 t
HPB300 rebar	38.5 t

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Advantages

Long clear span — 27m single span, no piers in river or road

Lightweight — steel box is ~1/3 weight of concrete bridge

Fast erection — shop-fabricated box, lifted in one piece

Clean aesthetic — box girder looks slim and modern

Wide deck — 4.5m deck handles pedestrian flow and bikes

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Disadvantages / Limitations

Steel needs painting — exposed steel needs anti-corrosion system

Vibration sensitive — footbridges sway under crowd load

Fatigue risk — repeated pedestrian loads stress welds

Higher initial cost — steel box costs more than concrete short spans

Maintenance ongoing — paint and bearing inspection every few years

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Typical Applications

Road crossing footbridges — pedestrians over busy roads

River crossing footbridges — pedestrian bridge over small rivers

Station connector bridges — between metro station and plaza

Campus walkways — across campus roads or green belts

Park footbridges — pedestrian bridge in city parks

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Fabrication Notes

Steel box girder shop-welded, Q345qB for main girder

60 mm C50 steel fiber concrete deck poured on top flange

50 mm asphalt wearing course on top of concrete

Bearings GJZ7400×69 installed at abutments

Box lifted as one piece to site, span 27m

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Steel box girder footbridge — 27m single span, 4.5m wide, 131.2 tons Q235C + Q345qB steel, C50 steel fiber deck, Φ1.0 bored pile foundations, built for pedestrian crossing over roads and rivers.

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**Email**: eddie@zdsteels.com, wells@zdsteels.com