A method for determining the length of the spliced ​​plate of the lower flange of the beam-column upper welded lower bolt joint based on the energy dissipation target

Abstract

The present invention relates to a method for determining the length of the spliced ​​plate of the lower flange of a beam-column upper welded lower bolt joint based on an energy consumption target. The following steps are adopted: based on the energy consumption target, the load-displacement of the node under cyclic load is drawn in the XY coordinate system Curve, the energy dissipation coefficient of the splicing area of ​​the lower flange of the frame beam is calculated from the curve; the length of the splicing plate on the lower flange side of the frame beam is determined, and the size of the splicing plate is checked and calculated according to the energy consumption target; the splicing plate on the lower flange side of the cantilever beam is determined Finally, determine the length of the spliced ​​plate of the lower flange of the beam-column upper welded lower bolt joint. In the design process of beam-column upper and lower bolt joints, if the spliced ​​plate is too short, the bearing capacity of the joint will be insufficient; if the spliced ​​plate is too long, the welding stress will be concentrated, the residual deformation will increase, and the lower flange plate and the spliced ​​plate will be buckled and unstable. For the above deficiencies, the present invention proposes a method for determining the length of the spliced ​​plate, which can ensure the bearing capacity, ductility and energy dissipation capacity of the upper and lower bolt joints of beams and columns, and reduce welding stress concentration and residual deformation.

Description

technical field [0001] The invention belongs to the field of design of beam-column joints of building steel structure frames, and in particular relates to a method for determining the length of splice plates of lower flanges of beam-column upper-weld lower-bolt joints based on energy consumption targets. Background technique [0002] With the improvement of economic construction on building structure and function requirements, steel structure has developed from being mainly used in the field of industrial plants in the past to now widely used in public buildings and civil buildings. The prefabricated steel structure is a building made by producing some or all of the components in the building in the factory, and then transported to the construction site for assembly. It has the advantages of short construction period, labor saving, pollution reduction and environmental protection. It is a modern building structure. Direction of development. [0003] In the fabricated steel ...

AI Technical Summary

Problems solved by technology

In the patent 201710903060.8, the inventor of this patent proposed a method of manufacturing beam-column joints with flange bolted and welded hybrid connections, and calculated the number of high-strength bolts on the lower flange of the frame beam and the length of the weld at the splicing plate on the lower flange of the cantilever beam , the components are processed in the factory, hoisted and assembled in place at the construction site, however, it is not clearly stated how to determine the size of the splice plate of the lower flange of the steel beam, and the energy consumption of the nodes is not considered

Patent CN109629684A discloses a reversible assembled anti-buckling trough web shear member beam-column node connection device, the node is a combination of beam end reinforcement and flange cover plate connection weakening, which can realize multiple energy consumption mechanisms, After the earthquake, the function of the structure can be restored only by replacing the connecting plate, but the dimensions and determination methods of the inner cover plate, backing plate and web shearing parts of the joint flange are not explained

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