ENERGY BALANCE BASED SEISMIC DESIGN METHOD OFRC STRUCTURES CONSIDERING CYCLIC BEHAVIORUNDER EARTHQUAKE

摘要

The primary objective of this study is to decide the Required Strength(Py) to control maximumdeformation by expressing the intensity of earthquake(seismic demand) with both total inputenergy(ED) and equivalent number of inelastic cycles(ND), and by applying energy balancemethod for equivalent Single-Degree-Of-Freedom(SDOF) system. Firstly, dynamic inelasticresponse is substituted to the stationary response and ND is defined as the amount which totalinput energy is divided by maximum momentary input energy. Secondly, energy dissipation modelof structure is shown in the stationary response and then Py to control the average of maximumdeformation is calculated by solving the energy balance. To predict transient response, MaximumDeformation Ratio (MDR) is estimated using both the maximum ductility factor and thehysteretic loop area. As a conclusion of these investigations, it is shown that the assumptions onthe model of energy dissipation and the definition of ND (that is, EIV concept) are generallyvalid. And the accuracy on calculation method of Py is almost high. For further improvement ofthe accuracy, however, it is important to estimate MDR accurately, particularly in the case ofJMAKOBE which is known to have occurred by the fracture of active fault.