The design of the structure consists of beam bridges
and panel bridges connected together to form a single crossing.
For such irregular continuous beam bridges
, ever-increasing pier height and span have brought about many technological problems to seismic design.
The prestressed concrete beam bridges
also have greater economy in larger-span bridge structures.
"Though the timing of the maintenance and the renovation of the two steel beam bridges
coincided with summer, a period when traffic is usually less than the rest of the year, the impact on the flow of traffic was felt by every motorist in the city," a spokesman for the Directorate of Public Works (DPW) admitted.
are straight shapes in which the downward forces are balanced by numerous supporting piers.
Text describes the development and details of the techniques that result in bridges of heavy stone, cantilevered beam bridges
, floating bridges, and the intricate but utilitarian covered "rainbow bridges" that can be found throughout the country.
This bridge spans 9.9 m with a width of 7.2 m and carries two lanes of traffic. Because these bridges have no butt joints, they provide improved load distribution characteristics when compared to stressed sawn lumber beam bridges
with butt joints.
With the exception of a some brief essays discussing the role of bridges in American transportation, types of bridge design, and the need for bridge preservation programs, the vast bulk of the material consists of 919 captioned illustrations (primarily black and white photographs) depicting beam bridges
, arch bridges, truss bridges, movable bridges, and suspension and cable- stayed bridges around the country.
The deck for log beam bridges
is formed by spiking sawn lumber planks across the log tops, or by placing soil and rocks on the logs.
* Beam Bridges
. A simple beam bridge
is similar in design to a log across a stream, except that the deck (the part of the bridge you can walk or drive on) is supported at both ends.