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Forces on a Suspension Bridge Apparatus (SMT-MM-10)
Investigation of a suspension bridge in various load
Suspension bridge, consisting of 2 supporting
cables, roadway and 2 deflection pulleys as pylons.
Supporting cables with parabolic sag.
Hangers (vertical supporting cables) in the form of
u-shaped shackles in graduated lengths.
Roadway (distributed load) can be loaded by
2 selectable roadways: stiff roadway (two-section
with central hinge) and elastic roadway.
Experimental setup “hanging cable”: supporting
cables without roadway, loaded with point loads.
4 hanger to measure the cable force in both
Suspension bridges are among the oldest of all bridge designs. Their main supporting element
is a flexible cable. Since cables are able to absorb high tensile forces while themselves having
little dead-weight, they enable wide-span suspension bridges to be constructed. This makes
it possible to bridge longer distances with no supporting pillars, such as over wide gorges. The
sag of suspension bridge supporting cables is parabolic in shape, as the weights are attached
at relatively short, constant intervals by way of vertical cables to the main supporting cables.
The experimental setup SMT-MM-10 represents a suspension bridge.
The bridge consists of two parallel supporting cables with a roadway suspended between
them. U-shaped hangers serve as vertical cables. They are attached to the main supporting
cables at regular intervals, and hold the roadway. Deflection rollers act as pylons. The
roadway acts upon the supporting cables as a distributed load, and can be loaded by
additional weights. Two roadways with different stiffness are available: one stiff and one
elastic roadway. The stiff roadway has a hinge in the middle. The hinge permits internal
moments in the roadway occurring in response to uneven loading to be visualized – the