What kind of bridge conditions are suitable for using special bearings for highway bridges
Conventional plate rubber bearings are only suitable for small and medium span, straight, and simply stressed bridges. In any of the following working conditions, special bearings must be selected:
Conventional plate rubber bearings are only suitable for small and medium span, straight, and simply stressed bridges. In any of the following working conditions, special bearings must be selected:
1、 Long span, heavy-duty, and large displacement bridges
Continuous beams with a span of over 60m, rigid frame bridges, steel box girder bridges, and interchange wide ramp bridges;
The bridge connection length is relatively large, and the temperature expansion displacement exceeds the travel of ordinary bearings;
Heavy duty mainline and freight channel bridges require a large vertical bearing capacity for a single support.
Supporting bearings: spherical steel bearings, large displacement bowl bearings
2、 Curved, oblique, and irregular bridge decks
Curved bridges, inclined bridges, and fan-shaped interchanges have beams that simultaneously undergo longitudinal expansion, lateral displacement, and multi-directional turning, and ordinary supports cannot adapt to universal rotation deformation.
Supporting support: spherical universal support
3、 Bridges in high-intensity earthquake zones that require seismic mitigation and resistance
Areas with seismic fortification intensity of 7 degrees or above; Urban elevated roads, main thoroughfares, hub overpasses, and important lifeline bridges are required to reduce earthquake impact and quickly restore traffic after the earthquake.
Supporting bearings: lead core isolation bearings, high damping isolation bearings, friction pendulum bearings
4、 Bridges with bearings at risk of tension and detachment
Single column pier ramp bridge, through arch bridge, rigid frame bridge;
Under the action of vehicle load deviation, temperature difference, and settlement, the support will generate upward pulling force, while ordinary supports are only under pressure and are prone to detachment and damage.
Supporting support: tension compression support
5、 Large bridges with strong winds and the need for lateral restraint
Cable stayed bridges, suspension bridges, and high pier bridges are prone to lateral drift of the beam due to strong winds and earthquakes, and lateral displacement needs to be limited.
Supporting bearings: horizontal limit ball bearings, wind and seismic resistant bearings
6、 Special construction technology bridge
Bridges that span railways, highways, and canyons using rotational construction require overall horizontal rotation and positioning during the construction phase.
Supporting support: Rotating ball joint support
7、 Bridges in harsh corrosive/low-temperature environments
Coastal cross sea and river bridges suffer from severe salt spray corrosion;
In cold northern regions, low temperatures in winter can cause ordinary rubber bearings to harden and fail.
Supporting support: Low temperature and anti-corrosion spherical/bowl type support
8、 Bridge with multiple deformations and complex working conditions
Bridges that connect old and new bridges, have elevated structures and building corridors, and have large differences in height and settlement, all suffer from multiple deformations such as settlement, expansion, and turning angles.
Supporting support: Universal sliding composite support
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