Buckling constrained beam and column self-reset joint based on steel-shape memory alloy (SMA) plate set element and assembly method

Abstract

The invention discloses a buckling constrained beam and column self-reset joint based on a steel-shape memory alloy (SMA) plate set element and an assembly method. According to the buckling constrained beam and column self-reset joint based on the steel-SMA plate set element and the assembly method, a flange part adopts the combined connection of a T-shaped plate, an SMA bone-shaped connecting plate and a beam flange plate with U-shaped holes and long circular holes so as to realize the improvement of the force transmission performance of the joint; the U-shaped holes and the long circular holes are formed in a beam flange so as to realize the relative sliding of a beam and the SMA bone-shaped connecting plate, deformation is enabled to be mainly concentrated upon the SMA bone-shaped connecting plate, so that it is ensured that main components are in an elastic state; and meanwhile, the energy-dissipating capacity of the joint is improved through friction, so that the problem that theenergy-dissipating characteristic and the self-reset characteristic of an existing joint are difficult to combine at the same time is solved; and in addition, the combined connection can effectively solve the local buckling problem caused by the SMA bone-shaped connecting plate due to superelasticity. A rectangular end plate is welded to a beam web, SMA disk springs are further arranged, on the one hand, the energy-dissipating capacity of the joint is enhanced, on the other hand, the rotational deformation capacity of the joint is improved, and the good self-reset characteristic of the combined connection is better reflected.

Description

[0001] Technical field: [0002] The invention belongs to the field of structural engineering, and in particular relates to a buckling-constrained beam-column self-resetting node based on a steel-SMA plate group element and an assembly method thereof. [0003] Background technique: [0004] Steel structure is widely used in residential buildings, industrial plants and other places because of its advantages of light weight, high strength, good plastic toughness, uniform material, convenient construction and high comprehensive economic indicators. However, the survey of earthquake damage found that steel structure buildings are prone to large residual deformation due to excessive plastic deformation under earthquake action, which cannot meet the normal use requirements after the earthquake. Therefore, in order to reduce the residual deformation of the steel structure building, we must fully consider the strength, stiffness, stability, ductility and other mechanical properties of ...

AI Technical Summary

Problems solved by technology

This joint solves the defect that the energy dissipation performance and self-resetting performance of the existing joints are difficult to have at the same time, and also overcomes the prestressing requirements of the post-tensioned joints and the complicated design of SMA bolt joints. proposed a combined connection method of T-shaped steel plate and SMA bone-shaped connecting plate. The T-shaped steel plate and beam flange realized the buckling constraint on the SMA bone-shaped connecting plate; The relative movement between the SMA bone-shaped connecting plate and the beam flange under the action, and the pre-tightening force applied to the bolts provides normal stress for the SMA bone-shaped connecting plate and the steel beam flange to increase the friction and improve the energy dissipation capacity, so the deformation under the earthquake It is mainly concentrated on the SMA bone-shaped connecting plate to ensure that the main components are in an elastic state, and the self-resetting of the nodes after the earthquake can be realized by using the superelastic performance of the SMA material

Images