Seismic Energy Analysis Of Multiple-story And High-story Reinforced Concrete Buildings

Based on the energy balance principle, this paper has researched the behavior of themultiple-story and high-story reinforced concrete buildings under the seismic loads, use the nonlinearsoftware PERFORM-3D for elasto-plastic analysis when the seismic structure under the severeearthquake, analyzing the effect of total input energy and energy consumption under differentground motion characteristics, like different earthquake intensities, different seismic spectra(epicentral distance, predominant period, characteristic period), different seismic durations,researched the relationship between the energy（total input energy，hysteresis energy，dampingenergy） and seismic peak acceleration. Also we have researched the distribution mechanism ofhysteretic energy at the inner-storey and structure components that effected by different structurestiffness. The main works and conclusions are as follows:According to the research requirements, choose the multi-story frame and high-story frameshear-wall reinforcement concrete structure as the researching objects, using software ETABS todesign and build the numerical model of the structure.Using fiber section method to define the numerical property of frame beam, frame column andshear-wall in the analytical model, the coupling-beams and floor slab were simulated by beamelements and shell elements. The constitutive relationship for the rebar is ideal elastoplastic andconcrete is nonlinear plastic. The66seismic waves are download from the pacific earthquake agency,according to these different characteristics, these waves were divided into different groups, whichmake it convenient to research the effect with different ground motion characteristics.The total input energy and structure consumption energy affected by seismic intensity will bestudied by adjusting the seismic peak acceleration, the result shows that the total input energy andstructure consumption energy will increase with the peak acceleration increasing; the proportion ofhysteretic energy in the total input energy increasing with the peak acceleration increasing, but theincreasing rate decreases, the proportion of damping energy in the total input energy increases at firstand then decreases and finally becomes stable; the structure member which consumes the mostenergy, the proportion of hysteretic energy on it decreases with the peak acceleration increasing, butfor the structure member which consumes few energy, the proportion of hysteretic energy on itincreases with the peak acceleration increasing.Use the different seismic spectra characteristics like epicentral distance, characteristic period,predominant period et al to study the seismic structure response under the different frequency spectra,The result shows that the total input energy and structure consumption energy are strongly affected by the seismic frequency spectra, but the effect about the proportion of hysteretic energy is weak,compared with the epicentral distance and predominant period, the characteristic period is better toreflect the effect of frequency spectra.Choosing36waves to analyze the energy acting on the structure that afected by seismicduration time, among the36waves,12waves are with short duration time,12waves with midduration time and12waves with long duration time. The statistical data shows that when seismicwith long duration acting on the structure, the energy were more powerful than the seismic withshort duration action, but the proportion of the energy is not terribly affected by seismic duration.This paper has researched the energy act on the structure affected by total stiffness, storystiffness and member stiffness of the structure. When the total stiffness of the structure increases, theproportion of hysteretic energy will decrease and the proportion of damping energy will increase,the energy consumption increases for the large-energy consumption member, the energyconsumption decreasse for the lower-energy consumption member; when the storey stiffnessdecreases, the proportion of hysteretic energy will decreases as well. When the stiffness of themember decreases, the energy consumption will decrease...