Analysis Of Shear Distribution Rate In The Dual Lateral Force Resistant System Of Steel Frame-central Braced

Steel frame-central braced frame system is one of the most commonly used dual lateral force resistant systems in high-rise steel structures. It is widely used in high-rise building structures as an effective and economical seismic structure system. While this system is considered inadequately in design, it may suffer seriously damage even collapse under strong earthquake actions occurred infrequently.In order to achieve the purpose of multi-protected system of earthquake-resistant, the stiffness of the framework needs to be adjusted properly during the design of frame-central braced frame system. However, there are still some divergences in partial adjustment of domestic regulations on the framework of the implementation of methods. Meanwhile, hardly any information about the influence of artificially adjusting to the elasticity and plastic dynamic response of structure (after the failure of local layer support, especially) were introduced.This paper base on the finite element program ABAQUS which consider of geometric nonlinearity and material nonlinearity. The results computed by ABAQUS and that obtained by the experiment on the vibration table are compared. The simulated results and the experimental results are matched perfectly that give the feasibility of using ABAQUS to carry out the elastic-plasticity time history analysis and to the correlative parameters. Meanwhile, it is economy to transform the computed models created by PKPM into ABAQUS by using programed Python language.Base on the parameters existent, response spectrum analysis and time history analysis of elasticity and elastic-plasticity analysis are carried out on a practical engineering. The results calculated by PKPM, SAP2000 and ABAQUS are compared and the differences are discussed. The plasticity development process of structural unit of overall building under rare earthquake is analized. The results show that the frame could be the second guarantee-line to prevent the collapse of structure after the brace fails under rare earthquake when the frame part is followed the shear adjustment in the code.In order to investigate the rationality of shear adjustment on steel frame-central braced system in the code, sixteen models of regular structure according to different stories, design intensity and whether make the shear adjustment by the code are calculated by PKPM. And the time history analysis under the rare earthquake is worked on the same models described above by the finite element software ABAQUS. Make the elastic-plasticity story displacement angle stipulated in the code as the measurable indicators, the analysis shows that the shear distribution rate of frame part in the steel frame-central braced system of regular structure could satisfy that each story of frame could undertake at least 25% shearing forces of this story instead of 25% of total shearing forces in bottom.