A) Arrangement on the surface:
a. For a simple beam:
In IPs simple girders, to ensure isostatic, we arranged a fixed knee
and a knee mobility.
- In simple beam bridge multiple spans, each cylinder are arranged on a pillow fixed and mobile knee, so the horizontal force on each cylinder (due to braking power, wind) and the elasticity of the slots are the same.
- In the event of a head-high, to reduce lateral force may be arranged 2 mobile pillow on pillars there.
b. For continuous beams:
We choose a fixed pillow placement based on two criteria:
- Set in abutment or office with low height to a horizontal thrust
- Set in the middle office to reduce the magnitude bridge expansion joints.
A) Arrangement on the ground:
- For Bcau≤12m demand, can ignore displacement of horizontal girder bridge owners should just arrange a local mobile pillow.
- For Bcau≥12m demand, Home transposition of horizontal beams are larger players have to arrange multimodal mobile pillow.
- Where there is no pillow portable multimedia, we can use a pillow portable
attacks. Then we have to put a pillow under the oblique angle cell, then the cell pillow must have at heart pillow concurrent fixed.
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