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 |
Steel Truss Pier
Figure 2 shows a front view of a steel truss pier.
The truss members consist of circular hallow profiles. Figure 3 shows the truss pier to pedestal connection.
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.
Abutment Cap Failure
Figure 5 shows the abutment and abutment cap on shore 1.
The abutment and the cantilever abutment cap are made of reinforced concrete. Figure 6 shows an enlarged view of the abutment cap region.
The abutment 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?