A prefabricated beam-column system for enhanced seismic and collapse resistance of structures

Abstract

The invention belongs to the technical field of building structures, and discloses a prefabricated assembly beam-column system that enhances the anti-seismic and collapse-resistant performance of the structure; it includes a prefabricated reinforced concrete column; , a section of reinforced concrete core column is set in the middle, and the replaceable parts are assembled on the periphery of the core column, and are detachably connected with the outer casing set on the precast concrete column body; the prestressed tie bars pass through the precast reinforced concrete beam without bonding and prefabricated reinforced concrete columns and anchored at the corners of the outer frame. The invention can significantly improve the energy dissipation capacity of the plastic hinge at the end of the column, delay the degradation rate of the plastic hinge stiffness; concentrate the plastic deformation on the replaceable parts group, which is beneficial to reduce the repair work after damage; strengthen through prestressed tension ribs The catenary mechanism of the beam acts as a second line of defense to enhance the collapse resistance of the prefabricated structure.

Description

technical field [0001] The invention belongs to the technical field of building structures, and in particular relates to a prefabricated assembly beam-column system that enhances the anti-seismic and anti-collapse performance of the structure. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: in previous earthquake disasters, most of the reinforced concrete frames showed the failure form of "strong beam and weak column" with plastic hinges at the column ends, and seldom occurred as expected in the building seismic design code. "Strong column weak beam" failure mode. Many experts have conducted research on this phenomenon, pointing out that various favorable factors such as floor strengthening and over-fitting of beam ends have greatly increased the flexural bearing capacity of beam ends, while reinforced concrete columns are more unfavorable in stress, so the failure mode of "strong column and weak beam" is relativ...

AI Technical Summary

Problems solved by technology

However, when considering the constraint effect of cast-in-place slabs and infill walls on frame beams, the deformation ability and recoverable function of the improved structure may be greatly reduced

[0004] To sum up, the problems existing in the prior art are: under the action of relatively large horizontal loads, most of the frame structures have plastic hinges at the upper and lower column ends in the joint area, and it is difficult to repair after damage; The load-bearing reliability (wind or earthquake) is lower than the expected level; the prefabricated structure has weak anti-collapse ability, and the traditional anti-successive collapse design makes the frame structure likely to appear "strong beam weak" under the action of earthquake due to the increase of longitudinal reinforcement in the beam. "column" damage mode, which is unfavorable for earthquake resistance

[0007] The prefabricated structure is formed as a whole through assembly technology. Due to the existence of weak connections, its collapse resistance is weaker than that of the cast-in-place structure. Susceptible to progressive collapse due to local failure due to lack of alternate load paths in case of accident

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