Hubrid Experiments on Allowable Earthquake Energy Partioning of Hysteretic Structures

在本课题的第一部分中，地震输入能量被定义为作用于结构中所有损伤的地震输入能量的总和。这种能量转化为所有质量和构件的动能和势能，然后被结构的粘性或滞后行为吸收。在这项研究中，地震能量谱是新提出的实际设计程序的基础上的能量概念。该反应谱反映了给定自振周期和阻尼比的单位质量的地震输入能量。应用模态分析和所提出的谱，建立了复杂结构中总输入能量最小化和能量分配控制的数学公式。第二部分，通过混合试验，寻找结构构件的精确失效准则。由最大位移反应和滞回耗能定义的损伤指标能较好地反映结构的损伤程度。因此，它可以作为非弹性抗震设计的一个参数。

In the first part of this project, earthquake imput energy is defined as the total of applied earthquake imput energy to all messes in a structure. This energy goes into kinetic and potential energy of all masses and members and then it is absorbed by viscous or hysteretic behavior of structures. In this study, earthquake energy spectra are newly proposed for practical design procedures based on energy concept. The spectra show integrated earthquake input energy of an unit mass with given natural period and damping ratio. Mathematical formulation is conducted for minimization of the total imput energy and control of its partitioning in complex structures applying modal analysis and the proposed spectra.In the second part, hybrid experiments are conducted to find accurate failure criteria of structural members. The damage index which is defined form both maximum displacement response and absorbed total hysteretic energy is found to represent degree of structural damage fairly well. Hence it can be used as a parameter for inelastic earthquake resistant design.