General Information
Figure 1 shows a pedestrian truss bridge over a weir.
| Main span | ≅ 13 m |
| Type | Half-through truss bridge |
| Truss material | Steel |
| Truss height | ≅ 0.8 m |
| Deck width | ≅ 0.8 m |
River Discharge Change
Figure 2 shows a steel truss pier.
The truss is made of circular hallow sections. Figure 3 shows the connection between the truss pier and the pedestal.
The connection consists of two stiffened base plates and eight anchor bolts (four per plate). Figure 4 shows the bridge during a high river discharge.
How precisely can the structural load of a river discharge be predicted?
Abutment Cap Failure
Figure 5 shows the abutment and abutment cap on shore 1.
The abutment and cap are made of reinforced concrete; the cap detached from the abutment without causing a bridge collapse. Figure 7 shows the abutment cap region viewed from above.
Figure 8 shows an enlarged view of a detached sector.
The concrete reinforcement consists of plain rebars, which have corroded over time. Due to the longitudinal plain rebars (two of them marked above), the abutment cap is still connected to the abutment.
Does the abutment cap still fulfill the structural safety and serviceability requirements of the bridge?