Giant buckling-preventing support frame structure system

Abstract

The invention relates to a giant buckling-preventing support frame structure system and belongs to the technical field of structural engineering. The giant buckling-preventing support frame structure system comprises giant columns, giant truss beams, frame columns, floor plates and giant buckling-preventing support components. The long giant buckling-preventing support components are obliquely disposed on the outer vertical faces of the structure system, and the tips of the giant buckling-preventing support components are connected with the giant columns and the giant truss beams through pins. The giant buckling-preventing support components span multiple floors and are connected with the floor plates at corresponding positions so as to restraint the displacement of the giant buckling-preventing support components in the direction vertical to the structure vertical faces. The giant buckling-preventing support frame structure system has the advantages that under a normal use and small earthquake condition, the buckling-preventing support components have the function similar to the function of central supports, necessary bearing capability and lateral stiffness are provided to the structure system; under a large earthquake action, the buckling-preventing support components can dissipate earthquake input energy by repeated inner core tension compression yield, additional damping is provided to a building, the earthquake action on the building is reduced, and energy dissipation and earthquake reduction are achieved.

Description

technical field [0001] The invention relates to a giant anti-buckling support frame structure system, which belongs to the technical field of structural engineering. Background technique [0002] With the continuous development of structural engineering technology, the building structure is also developing in two directions of large span and high floor. The greater the height of the building, the more significant the impact of horizontal loads such as wind loads and earthquake loads on the building structure. The mega-frame structure system is a widely used high-rise structure system. In the traditional mega-truss structure system, oblique giant central supports spanning multiple floors are generally used to ensure the stability of the structural system. The giant central support ends are connected with giant columns or giant trusses The beams are connected. [0003] The giant central support generally adopts pure steel members or reinforced concrete members. The giant cen...

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Problems solved by technology

[0004] Under the first approach, in order to prevent axial buckling due to excessively large support slenderness ratio, the strength plays a controlling role in the design, and then the central support section is made very large. This approach has the following disadvantages: (1 ) The size of the central support section is large, which wastes material and generates a large additional load on the structure

(2) The large-tonnage central support increases the self-weight of the structure, which increases the inertial force of the structure under earthquake load, which in turn leads to the failure and collapse of the structure under large earthquakes

(3) The seismic influence coefficient curve given in my country's current "Code for Seismic Resistance of Buildings" (GB50011-2010) shows that when the natural vibration period T of the structure exceeds the characteristic period T g , the seismic influence coefficient α decreases significantly with the increase of T, and formula (i) shows that T is located at T g ~5T g The attenuation curve of the seismic influence coefficient α at time between ∆; the large-section oblique central support and the giant frame form a stable triangular truss system, which will greatly increase the structural stiffness and greatly reduce the natural vibration period T of the structure. According to formula (i), The seismic influence coefficient α will be significantly increased accordingly, that is, a more significant load effect will be generated under the earthquake load, which will have an adverse effect on the structure

[0009] Under the second approach, the design is controlled by stability, which means that the central support is prone to buckling under large earthquakes, which will cause the following problems: (1) The central support arranged in a herringbone shape, when the compression bar buckles , will generate unbalanced shear force and axial force in the middle of the beam connecting the end of the central support, which will easily lead to the destruction of the beam

(2) Under the action of earthquake load, when the central support buckles, its axial compression stiffness drops sharply, even negative stiffness occurs, and the structure is prone to damage due to insufficient lateral stiffness

(3) The properties of the central support, which are prone to compression buckling and tension-compression stress asymmetry, make the hysteretic curve under repeated loads not full, and cannot play a good role in energy dissipation and shock absorption.

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