Analysis Of Energy Response In Aseismatic Frame Structures

The purpose of the performance-based aseismatic design is to meet the owner's requirement and the building's minimal capacity demand. In the course of the earthquake, structures will absorb, transfer and dissipate the seismic energy. And buildings will collapse or not is decided by their capacity of distortion and dissipating hysteretic energy. Therefore, structures must own the anticipated competence of distortion and dissipating hysteretic energy.Research about the energy response used to betake story model to analyze. But during the earthquake, the distortion of beams and columns in frame structures will influence each other, so the member model will describe the response of the displacement, force and energy of buildings more precise than story model. Thus this thesis uses the member model to analyze displacement and energy response of aseismatic structures in order to provide materials for developing the method of performance-based design.The work done in this paper is mainly as follows:1. A five-story frame building's displacement and energy response are discussed under three different types earthquake waves (L, M and S type). On the base of the discussion, the author finds that the hysteretic energy of the building is an important capacity index of aseismatic structures.2. The differences of the displacement damage rule and the two-parameter damage model (displacement and energy) are contrasted. Also the distinction between Park-Ang model and Niu's model is discussed. The author calculates the damage index of beams and columns by member model and contrasts the distinction when the beam's damage index is multiplied by different coefficients, thus points out the beam's damage coefficient is determined by the aseismatic capacity level of structures and the owner's demand.3. The ratio of beam's energy to column's energy is studied when the axial compression ration and reinforcement percentage are changed. At the same time influence effects about the ratio are discussed.4. From the energy response point of view, the disadvantage of the two-index method used to select earthquake waves for time history analysis is discussed in this paper. The duration and the energy distribution of the strong ground motion should be considered for selecting waves is put forward.