When designing the joint of the joint, leave a margin, the standard value of the yield bearing capacity (the cross-sectional area of ​​the sleeve multiplied by the standard value of the yield strength of the sleeve material) and the standard value of the tensile load capacity (the cross-sectional area of ​​the sleeve) The standard value of the tensile strength of the barrel material shall not be less than 1.10 times the corresponding value of the connected steel bar to ensure the reliable force transmission performance of the steel joint.
The strength and deformation of the joint when uniaxially stretched are the basic properties of the joint. The high stress repeated tensile and compressive properties reflect the ability of the joint to withstand high tensile stresses under wind loads and small earthquakes. The repeated deformation and compression performance of the large deformation reflects the mechanical behavior of the joint in the plastic deformation stage of the structure under strong earthquake conditions.
The above performance is an inspection item that must be carried out when performing the type test of the steel joint. The fatigue resistance is a test item that is selective depending on the joint application.
Reinforced sleeve joint design grade:
Class I: The tensile strength of the joint is not less than the actual tensile strength of the connected steel bars or the standard tensile strength of 1.10 times of steel bars, and has high ductility and repeated tensile and compressive properties.
Class II: The tensile strength of the joint is not less than the standard value of the tensile strength of the connected steel, and has high ductility and repeated tensile and compressive properties.
Class III: The tensile strength of the joint is not less than 1.35 times the standard value of the yield strength of the connected steel, and has certain ductility and repeated tensile and compressive properties.
There are many types of steel-reinforced steel sleeve joints, and the performance of the joints is also different. According to the mechanical properties of the joints, it is useful for different applications such as the importance of the structure, the position of the joint in the structure, and the percentage of joints. The joint type is reasonably selected for the occasion. For example, when a 100% steel joint connection must be implemented in the same joint section of a high-stress part of a concrete structure, a grade I joint should be used; when a 50% steel joint connection is implemented, a grade II joint should be preferred; Class III joints may be used where the stress is high but the joint ductility is not critical. After grading, it is also beneficial to reduce sleeve material consumption and joint cost, and obtain better technical and economic benefits. After grading, it is also conducive to the failure of the construction site joint sampling. The application site and joint percentage limit of different grade joints can be used to determine whether to downgrade. deal with.
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