The disadvantages of a girder bridge is that it's expensive to build. It is also very hard to maintain. It needs to have access to the confined space of the girderbox.
beam girder
write it properly here
The superstructure is steel box girder
London Bridge is a pre-stressed concrete box girder bridge.
It is a pre-stressed concrete box girder bridge.
It is a pre-stressed concrete box girder bridge
The present London Bridge is a pre-stressed concrete box girder bridge.
The present London Bridge is a pre-stressed concrete box girder bridge.
The current London Bridge is a pre-stressed concrete box girder bridge.
It is a pre-stressed concrete box girder bridge.
The current London Bridge is a pre-stressed concrete box girder bridge.
The current (1973) bridge is a prestressed concete box girder bridge.