Moving Load Simulator, an investment in infrastructure research

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What we see here is what we call the
Moving Load Simulator, it's the first and
the only one in fact in Canada. What it
does here is it tests the fatigue behaviour
of bridges in a realistic way.
As the heavy trucks or vehicles pass over
the bridge, they push down on the bridge,
and they create what you call bending and
shear stresses. In real life, this traffic,
it's cyclic in nature; meaning it comes and
goes. So you have a load passing over the
bridge and then it disappears on the other
side, another wave of traffic comes, and so on.
As it turned out, the way we do it now,
loading and unloading on the same spot,
we call it pulsating loading.
Pulsating loading is quite different in
nature from the real cyclic loading on the
bridge. The number of cycles it takes to
failure, we call it "fatigue life".
That translates in to the number of years
of service you can get out of the bridge.
The need for it is, is that there's a lot
more people shifting towards the long term
behaviour of these bridges, and that's why
we have a machine which is able to cycle for
months at a time, simulating the whole
lifetime of a bridge in as short
as a couple of months.
No tests to date have looked at a full-scale
wheel load on a full-scale bridge deck.
We believe that this will allow us to make
a more representative vehicular loading
scenario on the bridge decks, which will
allow us to gain an improved understading
of bridge deck behaviour; and this will in
turn allow contractors and companies to
design better bridges.

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Moving Load Simulator, an investment in infrastructure research

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