Structural Walls in Earthquake-Resistant Buildings. Dynamic Analysis of Isolated Structural Walls -Representative Loading History.

摘要

An analytical investigation attempts to estimate the maximum forces and deformations that can reasonably be expected in critical regions of structural walls subjected to strong ground motion. This document deals with the qualitative description of 'a representative loading history'which can be used in testing isolated structural wall specimens under slowly reversing loads. One hundred and seventy rotational response histories,representing a broad range of parameter values,are examined. The representative loading history is described in terms of the magnitude of the largest rotational deformation that can reasonably be expected in the hinging region of isolated walls,the total number of cycles of such large-amplitude deformations,and the sequence in which these large-amplitude deformations occur relative to deformations of lesser amplitude. Also considered are the forces (moments and shears) that can accompany these deformations. For the isolated walls considered in this study,the maximum number of large-amplitude cycles that can reasonably be expected for a 20-second duration of strong ground motion is six. A significant result is the fact that the first large-amplitude cycle of deformation can occur early in the response,with hardly any inelastic cycle preceding it.