Post-tensioning self-resetting joints capable of multi-stage energy dissipation and assembling method for post-tensioning self-resetting joints

Abstract

The invention discloses post-tensioning self-resetting joints capable of multi-stage energy dissipation and an assembling method for the post-tensioning self-resetting joints. The joints can slide relative to one another, and provide energy dissipation under small deformation through a mode of unilateral friction between a T-shaped piece and a beam flange, with increasement of deformation of openings of the joints, an SMA damper connected with a T-shaped plate begins to enter a phase transition energy dissipation phase, and introduced metal damping cannot increase residual deformation of the joints at the same prestress level; and for avoiding the characteristic of low redundancy of the post-tensioning joints, contact pressure-bearing of a bolt rod connecting the T-shaped piece and the beam flange and the oblong hole wall of the beam flange is allowed through an oblong hole, and under extreme conditions, collapse can be effectively resisted. According to the post-tensioning self-resetting joints, under small to middle seisms, friction damping is used for energy dissipation, energy dissipation in a combined energy dissipation mode can be realized by cooperating with SMA phase transition under middle to large seisms, and by means of post-tensioning prestress reinforcements, complete resetting is realized; and under the extreme conditions, joint force transfer is transformed intocollapse resistance in a hole wall pressure-bearing mode, and multi-stage energy dissipation and the multi-redundancy property are realized.

Description

Technical field: [0001] The invention belongs to the field of structural engineering, and in particular relates to a post-tension self-resetting node based on SMA damping and friction mechanism with multi-stage energy consumption and an assembly method thereof. Background technique: [0002] Steel has the characteristics of light weight, high strength, high elastic modulus, and high toughness, and is widely used in the field of structural engineering, especially complex long-span structures such as bridges and stadiums. Compared with steel structure components, the connection parts of the components are subjected to complex forces and poor reliability due to sudden changes in stiffness and uneven construction quality. They are usually weak areas of the structure. At present, the steel structure node connections mainly have the following forms: full welding Connections, bolted connections and bolted and welded hybrid connections. Considering labor costs and assembly requirem...

AI Technical Summary

Problems solved by technology

The post-tension self-resetting joint based on SMA damping and friction mechanism multi-stage energy dissipation solves the difficulty of anchoring caused by the high initial prestress level of the post-tensioning joint due to the guarantee of restorability and the sharp decrease in the rotational stiffness of the joint after unloading The problem; solve the problem that the SMA node has less initial stiffness and insufficient energy consumption, resulting in a larger demand for interstory displacement and interstory acceleration under earthquakes

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