The alternative to conventional trestle construction is trestle on towers, otherwise
known as viaducts. Trestle on towers can offer a significant reduction in footprint for
only a moderate increase in span requirements. It is customary for the spans to be of
alternating lengths, with the short span over the tower equal to the leg spacing at the
top of the tower. This ensures that each span remains a simple span with full bearing
at the ends of the span. Of course, trestle construction represents the typical site
conditions. More demanding site conditions may require exotic solutions. For
example, very tall, very short (length) conditions may lend themselves to arch
construction, whereas for transit operations, very long main span requirements may
lend themselves to suspension type construction and some trestles on towers may be
better constructed as a series of arches.
The alternative to conventional trestle construction is trestle on towers, otherwise
known as viaducts. Trestle on towers can offer a significant reduction in footprint for
only a moderate increase in span requirements. It is customary for the spans to be of
alternating lengths, with the short span over the tower equal to the leg spacing at the
top of the tower. This ensures that each span remains a simple span with full bearing
at the ends of the span. Of course, trestle construction represents the typical site
conditions. More demanding site conditions may require exotic solutions. For
example, very tall, very short (length) conditions may lend themselves to arch
construction, whereas for transit operations, very long main span requirements may
lend themselves to suspension type construction and some trestles on towers may be
better constructed as a series of arches.
การแปล กรุณารอสักครู่..
