Multistage yielding double-pipe restraint type self-resetting buckling-restrained support device

Abstract

The invention provides a multistage yielding double-pipe restraint type self-resetting buckling-restrained support device, and the device comprises an inner restraint steel pipe, an outer restraint steel pipe, a first energy-consuming steel pipe, a second energy-consuming steel pipe, two guide pipes, two positioning plates, two positioning end plates, two outer end plates, two connecting end plates, two groups of butterfly springs and two inner end plates. The multistage yielding double-pipe restraint type self-resetting buckling-restrained support device can yield for multiple times in stagesunder the action of an earthquake, and has equivalent self-resetting capability when the support is pressed or pulled, so that the symmetry of a tension-compression hysteresis curve of the support isensured, and the stress performance of the support is stably exerted.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a multi-stage yielding double-pipe-constrained self-resetting anti-buckling support device. Background technique [0002] Due to the uncertainty and complexity of the earthquake action, the structure may be severely damaged by an earthquake greater than the fortification intensity; at the same time, even if the structure does not collapse after being subjected to an earthquake with the fortification intensity, some special components are severely damaged and cannot Reinforcement and repairs lead to structures that can only be torn down and rebuilt, resulting in huge waste. [0003] The recoverable functional structure provides an effective solution to the above problems. The recoverable functional structure is a new type of shock-absorbing control structure, which mainly includes replaceable structural components, swing structures and self-resetting structures. In order to real...

AI Technical Summary

Problems solved by technology

First of all, in the existing products, the core energy-dissipating parts are usually equally distributed along the length of the support, the yield point is single, and the stiffness degrades seriously. energy, but causes the displacement of the structure to increase rapidly

Secondly, one of the main forms of the existing self-resetting anti-buckling brace is to combine the concrete-constrained energy-dissipating inner core with unbonded prestressed tendons, which is heavy and inconvenient to install; the prestressed tendons cannot fully exert their performance , resulting in unstable support performance, asymmetric tension and compression hysteresis, and reduced energy dissipation capacity; there is a loss of prestress, resulting in a significant difference between the performance of the support in use and the design performance

Thirdly, the buckling-resistant bracing members constrained by square casings have obvious strong and weak axes. Considering the randomness of the earthquake, it may lead to buckling and instability of the braces along the weak axes under the action of earthquakes; while the existing circular steel-pipe-constrained buckling-resistant bracing Need to set multiple welds at the end, which is difficult to construct

Finally, the compactness has a great influence on the bearing capacity and buckling mode of the concrete-filled anti-buckling brace, and improper fabrication will seriously affect the energy dissipation capacity of the brace

Images