Hebei Haichen Wholesale GPZ Spherical Sliding Bearing Shock Absorber Spherical Steel Bearing QZ Spherical Bearing Manufacturer

Description :

　　Classify by body shape

　　Circular isolation rubber bearing, with a bearing body with a circular planar shape

　　Rectangular isolation rubber bearing with a rectangular plane shape of the bearing body

　　Support model

　　The representation method of support model is as follows:

　　Principles for selecting bearings

　　When checking the bearing, the tangent value of the shear angle a of the bearing under normal use is calculated. When the braking force is not considered, tana ≤0.5; When considering braking force, tana ≤0.7.

　　When checking the bearing, the shear strain of the bearing under rare earthquake conditions should not exceed the allowable shear strain% in Table 1. It is also necessary to verify whether the mechanical properties of the selected bearings meet the requirements for use under corresponding seismic forces, and comprehensively consider factors such as the structural form, technical performance characteristics, construction process requirements, and cost of the bridge.

　　3. For bearings with the same vertical bearing capacity in this series, their horizontal stiffness increases with the increase of the rubber design shear modulus G value, but their ability to adapt to deformation decreases with the increase of G value. Therefore, when selecting, engineering and technical personnel should choose according to the specific situation or requirements of each bridge to optimize the structural stress and performance.

　　The conventional selection process for HDR series high damping isolation rubber bearings is as follows: determine the bearing structure type (Type I, Type II) → rubber shear modulus G (G0.8, G1.0, G1.2) → bearing adaptation angle θ → bearing body shape (circular, rectangular) → design vertical bearing capacity → design shear displacement → verification calculation or optimization design → (repeated)

　　5. According to the seismic fortification intensity and site type of the area where the bridge is located, Table 2 lists the recommended selection schemes for HDR series bearings under normal circumstances for reference by engineering and technical personnel.

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