Research of Damage Index of Reinforced Concrete Structure

This thesis is for the purpose of discussing the damage index of buildings under the earthquake over the years of definition by scholars, the so-called damage index,is refers to the structure to receive a succession of structure response parameter which under the earthquake function, and to establish a set of computation flow the damaged condition size. We may because of the damage index, to cognitive structure of extent of damage preliminary to judge this structure whether suits the housing or use again.
We use the structure to suffer a strong earthquake to make the system enter the non-linearity, cause the natural frequency of structure to start to change and judges its damage. This thesis simulates behavior of the nonlinear system in use Least-Squares Method to get the equivalent linear damping and frequency, and confirms its accuracy by Newmark-β Method, after judges the extent of damage of structure by the Maximum softening damage index, and improves it by the frequency with stiffness relations to damage index to promote its sensitivity. Then uses Park and Ang damage index this index is formed by the structure displacement and the energy dissipation under the carrying capacity, and considered its structural material parameter, the Maximum softening damage index, stiffness destruction index and Park and the Ang destruction index will do reorganizes and compares its good and bad points.
Finally, we can get the time history and material parameter of frames of one layer three cross frame collapse tests in National Center for Research on Earthquake Engineering to treat as measured value, carries on the example analysis. By way of identification as well as calculates result of each destruction index to make a comparison.