The Failure Mechanism Study Of Improved Lateral V-shaped Eccentrically Braced Steel Frame Structure

The traditional eccentric support structure is provided with a section of energy dissipation beam, and the number of energy dissipation beams is more, and the side V-type eccentric support structure is a new type of eccentric support structure. Layer to set a section of energy absorbing beam, reducing the amount of energy-consuming beam, to some extent also reduced the number of floor repair after the earthquake and the number of energy-saving beam replacement. According to the shortcomings of the present research on the V-type eccentric support structure of the V-shaped eccentric support structure, two improvements are proposed for the general-side V-shaped eccentric bracing structure: (1) The beam-column connection nodes are strengthened by the modified cover plate method,(2) in the side of the V-shaped eccentric support steel frame structure on the support of the diagonal link in series A friction energy dissipation device, the forrmation of side V-type energy consumption eccentric support steel frame structure, according to "the use of two energy-consuming components work together,common energy consumption," the idea of using friction energy dissipation device to dissipate part of the seismic energy, energy absorbed by energy absorbing beams.The main work of this paper is as follows: (1) to read a large number of literatures,summarize the current situation and shortcomings of eccentric support structure at home and abroad. (2) The finite element model of the V-shaped eccentric support structure and the V-type eccentric support structure of the side V-type energy dissipation device are strengthened by using the ANSYS software. The finite element model of the V-shaped eccentric support structure and the V- the internal force distribution characteristics of the structure under the condition of horizontal monotonous loading and cyclic loading, the energy dissipation mechanism and the deformation characteristics of the energy absorbing beam section. (3) The influence of the parameters on the energy dissipation mechanism, the failure mechanism and the seismic performance of the V-shaped eccentric braced steel frame with different parameters are studied.Through the analysis of this paper can be drawn: (1) The ultimate bearing capacity and ultimate displacement of the model are improved by the addition of the cover plate method, but the stress in the cover plate area is obviously smaller than that of the energy absorbing beam section, and the shear Hinges and bending hinges, and to avoid tearing damage in the steel column flange, to achieve the purpose of the node program design; (2) The improvement of the thickness of the cover plate and the increase of the thickness of the connecting plate have little effect on the bearing capacity and rigidity of the model, but it will reduce the energy dissipation capacity of the model. Therefore, it is suggested that when designing the improved cover plate scheme. The thickness of the cover plate and the connecting plate can meet the structural requirements in the seismic code and need not be increased; (3) The installation of the energy amplifier on the diagonal bar increases the ultimate bearing capacity, ultimate displacement and energy dissipation capacity of the model, and reduces the energy and rotational deformation of the energy absorbing beam, thus reducing the energy dissipation The degree of damage to the design of the purpose of the energy amplifier; (4) After the main and auxiliary plate thickness increases, the stiffness, bearing capacity and total energy consumption of the structure are slightly improved. Therefore, in the design side V-type energy consumption eccentric support structure, the main and auxiliary plate thickness in the design requirements to meet the premise of the appropriate thickening.