Novel prefabricated beam column system for enhancing structural anti-seismic and anti-collapse performance

Abstract

The invention belongs to the technical field of building structures, and discloses a novel prefabricated beam column system for enhancing structural anti-seismic and anti-collapse performance. The novel prefabricated beam column system for enhancing the structural anti-seismic and anti-collapse performance comprises a prefabricated reinforced concrete column; the prefabricated reinforced concretecolumn is composed of three segments, segments of reinforced concrete column bodies are separately arranged at two ends, a segment of reinforced concrete core column is arranged in the middle, and a replaceable part group is arranged on the periphery of the core column and is detachably connected with an externally enclosing sleeve arranged on the prefabricated reinforced concrete column bodies; and prestressed bonding ribs penetrate through a prefabricated reinforced concrete beam and a prefabricated reinforced concrete column without bond and are anchored to corners of an outer frame. According to the novel prefabricated beam column system for enhancing the structural anti-seismic and anti-collapse performance, the energy-dissipating capacity of a column end part plastic hinge can be obviously improved, and the stiffness degradation rate of the plastic hinge is delayed; plastic deformation is concentrated to the replaceable part group, and reduction of repair work after damage is facilitated; and a catenary mechanism passing through a bonding rib reinforcing beam is used as a second defensive line to improve the anti-collapse capacity of a fabricated type structure.

Description

technical field [0001] The invention belongs to the technical field of building structures, and in particular relates to a novel 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 r...

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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