Products  〃  Noise Reduction Bridge Joint System (ZJZ)
  LS Seismic Bearing is researched and developed by Professor Yuan Wancheng, from Tongji University. Datong, as the authorized
manufacturing and marketing company, has participated in the formulating of LS bearing Specification, the local provincial industrial
standard, in Jan, 2015.
1. Principle.
  LS Seismic Bearings are special seismic devices, functionally combining conventional bearings (Pot Bearings, Spherical Bearings
or FPB bearings) and cables. With cables anchored in both the top and bottom plates, LS Seismic Bearings work as locking devices of
displacements during bridge piers, while transferring the loads of superstructures to substructures.
  Normally, within the route range, the cable has no limit function; Thus, LS Seismic Bearing shares the same performance as
conventional bearings.
  When it encounters small or mediate intensity earthquake, in principle, the shear pin of fixed bearing is not allowed to be cut off in
order to avoid replacement of bearings after the seismic reaction.
  While the earthquake happens, fixed bearing¨s shear pin will be cut off; The sliding bearing will perform its function and make use
of sliding friction to consume energy in order to isolate the superstructures and substructures. This reduces the impact of the earthquake.
At the same rate, the cable is able to limit the displacement between the girder and the pier resulting from earthquake.
Design features:
  1) The moveable type can be realized without the anti-shear bolt;
  2) LS bearing plays a role as conventional pot/spherical bearing under normal serviceable condition;
  3) Under extreme condition such as severe earthquakes, the anti-shear bolt will be broken and the bearing now plays as a movable
bearing which will join with all the other sliding bearings to resist the earthquake forces;
  4) The wire ropes by this point will greatly strengthen the bearing to avoid components falling off. This will allow the bearings to
functionat a reasonably longer time span during which the friction between PTFE plate and stainless steel plate can better consume the
energy resulting from the earthquake;
  5) The wire ropes are also able to restrict the bearing to move in a limited distance. By this the protection on the whole structure
under earthquakes can be realized;
  6) Over 10% costing effective under equivalent seismic requirement;
  7) Loading capacity design ranges from 1,000 kN to 60,000 kN, total 30 grades.
  LXY is the length of shadow on the horizontal plan of the cable. H is the height of the bearing. A、B are the length and width of the
top plate while C、D are the length and width of the bottom plate. ξx、ξy are the vertical and horizontal design displacement.
  Cable Stiffness:
  According to material mechanics, stiffness K2 is calculated as follows:

  Eis the elastic module of the cable; A is its sectional area; L is the length.

  The Vertical Limit Strength:
  The ideal condition of the cable performing seismic reduction is under vertical limits strength of 30% to 50% of the bearing¨s design
load capacity.
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