Anti-shock and power-wasting uniform section joist steel and framed girder comprising same

Abstract

The invention discloses anti-shock and power-wasting uniform section joist steel and a framed girder comprising the anti-shock and power-wasting uniform section joist steel, and belongs to the field of building structures. The joist steel comprises a wing plate and webs, wherein the webs comprise at least one first web and at least one second web which are fixedly connected in parallel; the first webs and the wing plate are made of high-yield-point rolled steel; the second webs are made of low-yield-point rolled steel; the upper ends and the lower ends of the first webs and the second webs are connected with the wing plate; the ratio of yield strength of the low-yield-point rolled steel to the yield strength of the high-yield-point rolled steel ranges from 0.5 to 0.7. Under the action of earthquakes, the girder cross section where the low-yield-point rolled steel is located yields firstly and forms a plastic hinge, connection nodes of the girder and columns are protected, earthquake energy is dissipated, earthquake disasters are reduced, the girder cross section is continuous and uniform, machining and manufacturing are convenient, and manufacturing cost is low.

Description

[0001] technical field [0002] The invention relates to a constant-section I-beam in the field of building structures and an anti-seismic energy-consuming constant-section combined I-beam frame beam. Background technique [0003] Structural components in anti-seismic fortification areas must have a certain energy dissipation capacity. The ideal energy dissipation mode of steel frame structures under earthquake action is to form plastic hinges at the ends of frame beams. The flanges and webs of traditional steel frame I-beams are all made of high-strength steel with the same material, and are of equal cross-section. Because the bending moment at the end of the frame beam under the action of the earthquake plays a controlling role (shear force and axial force do not control action), so the ends of the beam are most likely to form plastic hinges. However, many earthquake disasters have shown that before the plastic hinge is formed at the end of the beam, the connection node b...

AI Technical Summary

Problems solved by technology

However, many earthquake disasters have shown that before the plastic hinge is formed at the end of the beam, the connection node between the beam and the column is first damaged, causing serious disasters

In order to prevent this phenomenon, there have been successively strengthened beam-column joints in the world (by widening or thickening the size of the beam flange to increase the connection weld between the beam and the column), weakening the end section of the beam (cutting the beam flange or web opening) and a series of seismic improvement methods. Although these methods are effective, they change the cross-sectional shape of the beam and become a non-uniform cross-section beam, which not only affects the local stability of the flange, web and other plate parts, but also affects the overall beam. Stability is also affected, and the processing and production are cumbersome, which increases the construction cost

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