Effects On Seismic Design And Performance Based On Different Seismic Fortification Intensity For Reinforced Concrete Frame Structure

Performance-based seismic design relies on seismic fortification level, which ismainly performed by seismic fortification intensity and ground motion parameters. Thereasonable selection of seismic fortification intensity will directly affect the realiza tionof the seismic performance objectives. Our country is compiling the fifth generation ofThe seismic intensity zoning map, and the adjustment of intensity will bring changeson seismic design and performance of structures. So it is siginificant to research therealization of multi-level seismic performance objectives and the effects on seismicdesign and performance of RC frame structure under different seismic intensity for thedevelopment of performance-based seismic design and the reasonable adjustment ofseismic fortification intensity.In this paper, which is based on Pushover analysis and takes seismic fortificationintensity as seismic design variables, the effects on seismic performance is studied byusing different seismic fortification intensity in performance-based seismic design ofRC frame structure. The main research works are as follows: Three groups (18) of RCframe structures are designed by PKPM software according to different floors andseismic fortification intensity. The effects on the structure section size, the amount ofconcrete and rebar, and other main parameters of the overall control structurerationality are compared and analysed, so that it is possible to study the deformationcharacteristics and the dynamic characteristics of structures under different seismicfortification intensity. By using SAP2000software,12RC frame structures areanalyzed by Pushover analysis, and several key problems of Pushover analysis arestudied. The paper compares several methods of establishihing inelastic demandspectrum and analyzes the differences between the improved elastic responsespectrum-based equivalent damping ratio method with the traditional method. At thelast part of this paper, basing on general rule for performance-based seismic design ofbuildings, it puts forward a comprehensive classification standard level of seismicperformance of RC frame structures by combing inter-story drift angle of structurewith plastic hinge of component, and the standard is used to evaluate the seismicperformance and assess the seismic performance level of4eight-floor structure modelsunder earthquake of different levels which designed based on different seismicfortification intensity. It mainly analyzes the effects on seismic performance of structures which designed based on different seismic fortification intensity.