A High Ductility Micro-Damage Reinforced Concrete Frame Beam

Abstract

The invention discloses a high-ductility micro-damage reinforced concrete frame beam, which comprises beam concrete, common longitudinal bars, high-ductility longitudinal bars, common stirrups and local constraint stirrups. U-shaped beam end pressure relief grooves and beam body pressure relief grooves are arranged on the end face of the frame beam and the lower half of the circumference of several cross sections within a certain range in the mid-span direction. The local restraint stirrup is assembled by a large circle closed stirrup and several closed circular restraint ribs slantedly sleeved in its two lower corners. The local restraint stirrup can restrain the lateral deformation of the concrete in the large circle closed stirrup, thereby improving the compressive capacity of the concrete inside the large circle closed stirrup; the pressure relief groove prevents the compressive stress in the concrete protective layer in the compression zone The amplitude is raised to avoid crushing and falling off; combined with the existing high-ductility micro-damage longitudinal reinforcement technology, it provides an effective technology for comprehensively improving the toughness of reinforced concrete frame structures.

Description

technical field [0001] The invention relates to a high-ductility micro-damage reinforced concrete frame beam, in particular to a high-ductility micro-damage reinforced concrete frame beam suitable for the technical field of construction engineering. Background technique [0002] Earthquake disaster is one of the main disasters faced by civil engineering structures. At present, one of the main technical approaches to reduce earthquake damage to structures is to adopt ductile anti-seismic structures. In reinforced concrete frame structures, the main anti-seismic measure of the structural system is to set ductile structural measures at the end sections of the frame beams, that is, to achieve plastic energy dissipation under large earthquake bending moments by setting longitudinal steel bars with good yield performance, and at the same time The shear bearing capacity of the beam end section is improved by the reinforcement measures of the stirrup, and the ductility of the concre...

AI Technical Summary

Problems solved by technology

[0003] However, the cost of the above-mentioned traditional anti-seismic measures is that the structure undergoes irreversible plastic damage or even destruction under a large earthquake, which is specifically manifested in: the tensile longitudinal reinforcement is hardened, brittle, and elongated due to multiple plastic yields, making it impossible to continue to use The compressed concrete is brittle due to repeated reciprocating high-strain compression, and what's more, the concrete at the protective layer often falls off in a large area

Obviously, this result cannot meet the requirements of the current engineering structure to develop towards high toughness.

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