Research On Experiment And Seismic Design Mothedology Of RC Frame Structure Base On Energy

Although a lot of advancement has been achieved since energy-based methods were presentedin1950s, many issues on energy are worth for further study. Based on the energy concept, anexperimental research was conducted on the energy dissipation capacity of reinforced concretecolumn specimens, and the main damage index models were compared according to the test data. Inthe paper, the elastic-plastic three-dimensional structure analysis program CANNY applicabilitywas verified, and the influence of damping on energy reaction were analyzed.Through inputting of188seismic records according to the site classification of Chinese seismic code, the three-segmentelastic input energy spectra and then an elastic-plastic input energy spectra are proposed based on thecompound intensity indicator. On this basis, a method to evaluate theE h/EIratio is proposed.Vertical distribution of seismic input energy is analyzed, and a design method of changing the inputenergy demand into the equivalent acceleration demand is proposed. The following findings andconclusions are reached:(1) Eight specimens of reinforced concrete columns under cyclic loading were conducted. Onthis basis, damage index model for comparative study were conducted, and the use of suggestionsare proposed.(2)The three-dimensional structure analysis program CANNY was verified by using the actualtest data and the actual works of component-level and structural level, and the CANNY is shown agood energy analysis software.(3) The viscous damping and complex damping, the measured damping ratio data and analysis,etc. were introduced according to the research results in the literatures. The influence of differentdamping models on seismic response of frame structure has been studied, and proposals are putforward.(4) Describes the main input ground motion parameters, including ground motion amplitude,frequency characteristics, duration and the composite ground motion parameters. This paper arguesthat energy-based design methodology must also consider the factors of the magnitude, frequencycharacteristics and duration. Through inputting of188seismic records according to the siteclassification of Chinese seismic code, three-segment elastic energy spectra are proposed based onnormalization methods.(5) A statistical analysis is conducted on the48records belong to the four sites, respectively.The elastic-plastic SDOF system input energy spectra are proposed based on the compoundintensity indicator, and fitting formulas are put forward for the convenience of the designapplication. On this basis, a method to evaluate theE h/EIratio is proposed. (6) Confirmation study on the decomposition of the input energy of elastic MDOF system to theinput energy of elastic SDOF system is conducted. Vertical distribution of the hysteretic energy isanalyzed. The study shows that the vertical distribution of the hysteretic energy is not trapezoidaland lognormal distribution, and a practical formula can not be extracted from.(7) A design method of changing the input energy demand into the equivalent accelerationdemand is proposed, and the China's establishment of site classification rules and the ductility orstrength reduction factor of structures are taken into account in the method.