Study On Acceleration Response Spectra Characteristics Of Typical Steel Structures

According to statistics,the cost of functional non-structural components in modern large buildings can be as much as 70%～80% of the total building cost on average.Among the casualties and property losses caused by earthquakes,the loss caused by the destruction of non-structural components of buildings and their systems accounts for an increasing proportion.Although the seismic design requirements for non-structural systems are clearly put forward in the Code for Seismic Design of Buildings(GB 50011-2010),the rationality of the parameter such as floor amplification coefficient based on the concept of floor acceleration response spectrum is still worth discussing,especially for the applicability of steel structures built in large numbers in recent years in China.Taking this as a starting point,this paper studies the floor acceleration response spectrum analysis of three types of typical steel structures,namely steel frame,concentrically braced frame and eccentrically braced frame,based on the elastic and elasto-plastic time-history response analysis method.The main research contents are as follows:1.The concept of floor acceleration response spectrum and the development history of seismic research on non-structural components at home and abroad are introduced,and the key objectives of this study are proposed.2.Based on our country "code for seismic design of buildings on site type and design earthquake group,from structure design software PKPM ground motion record database and PEER ground motion records in the database,for each example structure,100 natural ground motions acceleration records are selected for time history analysis.From the actual engineering cases,a total of 25 typical prototype calculation examples of steel frame,steel frame center brace and steel frame eccentric brace are selected and determined for the research in this paper.3.Prototype is established for the above three kinds of 25 example structure finite element analysis model,has carried on the different article 104 under the condition of peak acceleration records input of elastic and elasto-plastic seismic response time history analysis,and get all the floor acceleration response of the structure of each case,and on this basis,the structure of all 25 examples calculated floor acceleration response spectrum analysis.Through a lot of calculation and analysis,the amplification rules of the three kinds of steel structures(PFA/PGA,PSA/PFA,PSA/PGA)along the height of the structure are given,and compared with the formulas of ASCE7-16,IBC 2015 and GB50011-2010.Through data fitting analysis,a simplified calculation formula for each type of steel structure is given.4.For considering soil-structure interaction on the influence law of structure of floor response spectrum,this article selects a typical multi-layer steel framework structure finite element model established the soil-structure interaction analysis,whether conducted considering soil-structure interaction analysis,preliminary analysis gives the soil-structure interaction on floor acceleration amplification reaction and the influence law of floor response spectrum.