Civil Engineering Reference
In-Depth Information
Figure 1.11
Hungerford Footbridge (Photo: Robert Benaim)
When the M25 came to be built in the 1970s, the author, then working for Arup,
was responsible for the design of a parallel bridge, Figure 1.12 (c). This bridge has
precisely the same function and span as Lutyens' original, although it works quite
differently. For instance, the arch thrust is balanced by the thrust of the rear, raking
strut, so only vertical loads are applied to the foundation, Figure 1.12 (d). Although it
was more expensive than a simple girder bridge, this was justifi ed by the precedent set
by the adjacent structure. The design has been guided by the principles of reconciling
economy, rationality and appearance, as described above, and expresses its structural
action. This is no guarantee that it will be as well loved as the original.
The other major bridge designed by Lutyens is the Hampton Court Bridge, also
across the Thames, Figure 1.13. This is a series of Portland stone arches with brick
spandrels, or is it? Does it matter?
