ABSTRACT

The displacement-based assessment procedure of Priestley and co-authors was formulated to provide either a pass-fail type of assessment or an indication of the likelihood of exceeding a selected limit state. To account for the effect of uncertainty in demand and capacity as part of the displacement-based assessment, it has also been shown that the SAC-FEMA approach can be adopted. In this work, the displacement-based assessment approach is improved by developing new relationships between intensity and inelastic displacement demand that permits the impact of multiple intensity levels on the likelihood of exceeding a limit state to be assessed contemporarily. The benefit of the new approach is illustrated by comparing the annual probability of exceeding key limit states as obtained through multi-stripe analyses with results obtained from the simplified approach. Results indicate that the simplified method performs reliably for the cases considered. Limitations with the new approach and future research needs are identified.

摘要

Priestley 和合著者的基于位移的评估程序被制定为提供通过-失败类型的评估或超过选定极限状态的可能性的指示。作为基于位移的评估的一部分，考虑到需求和容量不确定性的影响，还表明可以采用 SAC-FEMA 方法。在这项工作中，通过在强度和非弹性位移需求之间建立新的关系来改进基于位移的评估方法，该关系允许同时评估多个强度水平对超过极限状态的可能性的影响。通过将通过多条分析获得的超过关键极限状态的年度概率与从简化方法获得的结果进行比较来说明新方法的好处。结果表明，简化的方法在所考虑的情况下可靠地执行。确定了新方法的局限性和未来的研究需求。