Study On Steel Frame Structural Influencing Coefficient

Medium earthquake and strong earthquake will make structure into the elastic-plasticstage, structural deformation will consume part of the earthquake energy, thesame displacement under the bottom of the seismic response of shear is significantlyless than the elastic response of the bottom of the shear, combined with a number offactors, making the structure in the elastic-plastic state solution become very complicatedseismic action, the use of structural influence coefficient reduction can be drawn fromelastic-plastic earthquake response. To simplify the calculations, the introduction ofnational seismic code structures are the influence coefficient concept, but the structuredefinition of the influence coefficient is different.The abroad coefficient factors to consider a more comprehensive, most consider theductility level, structural systems and materials and other factors, our specification doesnot consider the differences in type of structure, ductility level, cycle and in whichthe earthquake risk environment, the influence coefficients of all the structure to take thesame structure, is clearly not reasonable.The existing "Seismic Design of Buildings seismic standards"(GB5009-2010)(hereinafter referred to as "10seismic norms") pursuant to the "three levels, two-stage"principle, the extension from "89seismic norms" from the use of "small earthquakeflexible design"law, and did not consider the impact of structural ductility of reinforcedconcrete structures, steel structures and structural systems are used all kinds of structuraleffects of a single coefficient (2.8125), which take the same seismic coefficient. Ductilityof steel as well, here led to the design of seismic steel value is too large, large amount ofsteel, limiting the development of steel in China.This paper compares the impact of foreign major structural seismic code coefficientvalues, analysis of the structure of China’s seismic code development and changes inimpact factor, analysis of China’s current "10anti-seismic norms" in the calculation ofseismic deficiencies, get the following conclusions:"10anti-seismic norms "implicit in thestructure of impact factor value of2.8125the fixed value, without considering thedifferent structures of the impact ductility of the earthquake, seismic calculations in thelack of objectivity. This design of six multi-storey steel frame, calculated using SAP2000for Pushoveranalysis, and resulting impact on the structure of steel factor. The results show that:According to China’s "10anti-seismic norms" for steel design, structural effects of taking2.8125coefficient to6-layer steel frame and under6-layer steel frame values of theseismic action is too large.