NEXT PLUS: Seismic Assessment Procedures

该项目的主要目标是开发近期（正在进行）和长期的程序，以简洁、明确、严谨地表示现实多自由度（MDOF）结构的非线性行为的概率分析，并通过将它们应用于现有结构来证明它们在建筑实践领域的适用性。研究了多自由度结构的减载系数R的概念；这个r因子捕获了结构和地震记录的弹性后动力相互作用。这项任务将确定R因子在多大程度上依赖于大小和距离，从而确定何时需要对具体地点进行分析。对损伤措施的依赖性和框架/基础问题也将进行研究。在大多数情况下，现有的（基于单一自由度的线性）地震危险度图足以适用这些程序；可能包含危害相关问题的主要部分。该程序将反映非线性响应和容量中的附加不确定性。该项目将为结构的非线性行为及其对地震因素的依赖提供新的认识。它将为建筑设计专业对一套实用程序的需求提供重要的答案；它将为目前的建筑设计格式提供在机械上和概率上都是国际一致的。* * *

9423596 Cornell The project's primary objectives are to develop near-term (on going) and longer-term procedures for succinct, explicit, yet rigorous, representation of the probabilistic analysis of nonlinear behavior of realistic multi-degree-of- freedom (MDOF) structures and to demonstrate their applicability in the domain of building practice by applying them as existing structures. The concept of the load reduction factor, R, for multidegree-of-freedom structures will be studied; this R-factor captures the post-elastic, dynamic interaction of the structures and the earthquake record. This task will determine the degree to which this R factor depends on even magnitude and distance, and hence when it might require Site-specific analysis. Dependence on damage measure and frame/foundation issues will also be studied. In most cases existing (linear single degree-of- freedom based) seismic hazard maps will be adequate for application of these procedures; may contain the dominant portions of the hazard-related issues. The procedures will reflect the additional uncertainties in nonlinear response and capacity. The project will provide new understanding about nonlinear behavior of structures and their dependence on seismological factors. It will produce significant answers to the building design profession's need for a set of practical procedures; it will provide to current building design formats that are internationally consistent both mechanically and probabilistically. ***