Anti-buckling supporting member with lattice type double-rectangular-pipe cross section

Abstract

An anti-buckling supporting member with a lattice type double-rectangular-pipe cross section comprises two anti-buckling branches which are connected through a plurality of steel batten plates, wherein each branch adopts an anti-buckling supporting member provided with a linear core and a restraint concrete-filled rectangular steel pipe; long edges of the two branches are parallelly arranged at appropriate intervals, a lattice type member formed by connecting the plurality of steel batten plates which are distributed longitudinally is taken as a whole for common work, the steel batten plates and branch short edges, namely short edges of the restraint rectangular steel pipes, are in welded connection through trihedral angle welding seams; and end parts of the linear cross section cores of the two branches extend out of circumferential restraint members, and are connected through a ribbed plate to form an H-shaped cross section which can be connected with a frame member through a high-strength bolt and a connecting plate. The lattice type cross section can increase inertia moment of the whole cross section of the anti-buckling supporting member and the whole flexural rigidity, thereby particularly suitable for a design of a large-tonnage anti-buckling support member, the support end part is conveniently connected with the frame member, and the lower branch still can sufficiently play energy-dissipating capacity when eccentric bending moment is added.

Description

technical field [0001] The invention relates to a novel buckling-resistant energy-dissipating support member, which belongs to the technical field of structural engineering. technical background [0002] The anti-buckling bracing member is a new type of anti-lateral force member with excellent energy dissipation and shock absorption effect, and generally consists of two parts: the inner core member and the outer restraint member. Under the action of small earthquakes, the anti-buckling support members maintain elasticity and provide sufficient lateral stiffness for the main structure; under the action of moderate and large earthquakes, the inner core will not buckle under compression due to the constraints of the peripheral components, and the tension will not occur. Under repeated compressive loads, the inner core can enter yield in its entire section, and the hysteresis curve is very full, which can consume a large amount of seismic input energy. After the Northridge Eart...

AI Technical Summary

Problems solved by technology

However, if this type of member is used in the design of buckling-resistant support members with large tonnage requirements, its cross-sectional size will inevitably be made large, and the self-weight of the support member will double. cost, on the other hand, the structure will withstand greater seismic action during an earthquake

In addition, the buckling-resistant support members in the frame structure inevitably bear a certain additional bending moment due to eccentric installation or rigid connection of nodes, and it is difficult to achieve ideal axial compression.

The current research shows that the additional bending moment existing at the end connection may lead to premature failure of buckling-resistant brace members, and their energy dissipation capacity cannot be fully utilized

Images