Prestress-free tough steel structure composed of hinging columns and elastic resetting beam

Abstract

The invention discloses a prestress-free tough steel structure composed of hinging columns and an elastic resetting beam. The prestress-free tough steel structure comprises the elastic resetting beamand the two column foot hinging box columns; the elastic resetting beam comprises two cantilever section I-shaped steel beams, a middle section I-shaped steel beam and buckling-restrained high-strength steel rods, the cantilever section I-shaped steel beams are fixed to the column foot hinging box columns, the middle section I-shaped steel beam is connected between the two cantilever section I-shaped steel beams, the buckling-restrained high-strength steel rods are symmetrically arranged on the two sides of a web plate along the central axis of the beam, one ends of the buckling-restrained high-strength steel rods are in fastening connection with web plates of the cantilever section I-shaped steel beams, and the other ends of buckling-restrained high-strength steel rods are in fastening connection with a web plate of the middle section I-shaped steel beam; and the prestress-free tough steel structure is arranged in a left-right symmetry mode. By utilizing elastic restoring force of thebuckling-restrained high-strength steel rods after an earthquake and through cooperation with hinged column feet, overall self-resetting of a joint and the columns is realized under the prestress-free situation. The anti-shear bearing capacity is provided through splicing angle steel, and the problem of weak anti-shear capability of a traditional self-resetting joint is solved.

Description

technical field [0001] The invention relates to the field of anti-seismic building structures, in particular to a prestress-free ductile steel structure composed of hinged columns and elastic restoration beams. Background technique [0002] my country is one of the countries with frequent earthquakes and the most serious earthquake disasters. Previous earthquake damages have shown that steel frame structures will have serious plastic damage at the beam-column joints and column foot joints during earthquakes, resulting in serious damage to the overall structure after the earthquake. Residual deformation makes it difficult to repair the structure, and the original structure has to be demolished and rebuilt, which significantly increases the time and cost required for reconstruction. For this reason, the current concept of anti-seismic design of building structures has changed from the previous "collapse-proof design" to "recoverable design". Set additional prestressed reset el...

AI Technical Summary

Problems solved by technology

[0003] (1) Complex construction: The traditional self-resetting structure needs to apply prestress to the beam-column components at the construction site, which increases the difficulty and construction period of on-site construction, and cannot fully reflect the construction advantages of rapid assembly of steel structures

[0004] (2) Poor shear performance: The shear bearing capacity of beam-column members depends entirely on the friction force at the center of rotation after prying, and the reliability of shear force transmission is low. Once the prestress is lost, it is easy to cause shear failure and slippage of steel beams security risk

[0005] (3) Inconsistency with the deformation of the floor: When the beam-column member is pried and deformed, the position of the center of rotation changes continuously on the upper and lower flanges of the beam, resulting in severe cracking of the floor under the action of negative bending moment (the upper flange of the beam is opened) (such as figure 2 shown), it is difficult to repair the floor after the earthquake, and the confinement effect of the floor will also reduce the energy dissipation capacity of the energy dissipation units set on the upper flange of the beam

[0006] (4) Reduced shock absorption effect: For traditional self-resetting structures, the key technical requirement for realizing self-resetting after an earthquake is that the resetting bending moment formed by the prestress of the resetting unit must be greater than the reverse bending moment generated by the internal force of the energy-dissipating unit. It will significantly reduce the energy dissipation effect of the node, resulting in a reduction in the shock absorption effect of the node

[0007] (5) Large acceleration response: The collision and impact caused by repeated prying of beam-column members in traditional self-resetting joints will cause significant stiffness mutations in beam-column joints, resulting in an increase in the seismic acceleration response of the structure and aggravating the damage of non-structural components

[0008] (6) The self-resetting ability of the overall structure is weak: the existing self-resetting technology mainly stays at the self-resetting at the beam-column joint level, but the actual earthquake damage shows that the steel frame column foot will also produce serious plastic damage during the earthquake and cause Significant residual deformation, so it is necessary to propose an effective structural self-resetting technology from the overall structure level

Images