The Influence Analysis Of Different Forms Of Energy Dissipation Devices Upon Staggered Steel Truss Framing System

At present, domestic steel industry has a lot of pressure on destocking. Compared to developed countries, steel construction accounts for a small portion of the market in China. The 13th Five-Year Plan proposes to develop prefabricated construction. Staggered steel truss structure system has the advantages of better economy, neat component forms and easy to mass-production. However, seismic performance of staggered steel truss structure system is not very good, because of this, it can't be wildly used in high seismic fortification intensity sites, the range of application is limited. The research of staggered steel truss structure system started in the 1860s, and there has been more than 20 years since domestic scholars began to study this structure system. But the research of applying different forms of energy dissipation devices to staggered steel truss structure system is not comprehensive.In order to improve the seismic performance of staggered steel truss structure system and promote this structure system, this paper utilized MIDAS/gen software platform, applied Y-shaped eccentrically braced steel frame and viscoelastic damper on Staggered steel truss structure system and study the changes of deformation and forces. Specific work and conclusions carried out as follows:(1) Build spatial models of a Y-shaped eccentrically braced staggered-steel truss system and a concentrically braced system. Conduct elastic and elastic-plastic time history analysis. Discuss impacts of Y-shaped eccentric braces upon structural deformations and load of members.(2) Build co-working mechanical model of staggered-steel truss system with viscoelastic dampers. Conduct elastic and elastic-plastic time history analysis. Discuss differences between controlled and uncontrolled structures in structural deformations and load of members.(3) Build co-working mechanical model of staggered-steel truss system with energy-consuming eccentrically braces.for elasticity and plasticity analysis. Conduct elastic and elastic-plastic time history analysis. Discuss differences between controlled and uncontrolled structures in structural deformations and load of members.(4) Summarize features of impacts of different energy consumptions upon a staggered-steel truss system. Active beam link can reduce the deformation of structure, reduce load of members of its own panel. Viscoelastic dampers can reduce deformation and weaken dynamic response of structure. And viscoelastic dampers have a good control upon braces of the whole truss unit, but column axial force will increase.(5) Energy-consuming eccentrically brace consists of active beam link and viscoelastic damper. The influence of active beam link upon staggered-steel truss system is more profound than viscoelastic damper. Energy-consuming eccentrically brace can reduce the deformation of sturcture and column axial force, however the control of dynamic response of structure and the whole truss unit are not as good as viscoelastic dampers.