Seismic Analysis and Design of Steel Frames with Partially Restrained Connections

9526809 Haldar将对考虑所有主要耗能源的部分约束连接钢框架的非弹性地震反应行为进行全面研究。该程序尽可能实际地考虑几何非线性，包括在PR连接存在时由于漂移引起的P-delta效应、材料非线性、PR连接处的加载和再加载行为以及阻尼。采用非线性随机有限元算法考虑参数的不确定性。将进行可靠性分析，以推广在实验和确定性分析期间所做的观察结果，并对设计进行编纂。然后将制定与强度要求相一致的适用性要求。将研究局部、层间和整体延性的几种定义，特别是对多自由度结构的延性，并将确定最适当的定义。常用的钢框架，包括弯矩框架，支撑框架，双系统与同心和偏心支撑将进行研究。设计因素将被重新评估和引入到带PR连接的钢框架的抗震设计中。该研究将补充SAC由FEMA资助的钢框架结构地震分析的第二阶段研究。该项目将涉及工业贸易和协会，如美国钢结构协会（AISC）和美国钢铁协会（AISI）。* * *

9526809 Haldar A comprehensive study will be conducted on the inelastic seismic response behavior of steel frames with partially restrained (PR) connections considering all major sources of energy dissipation. The procedure considers as realistically as possible the geometric nonlinearity including the P-delta effect due to drift in the presence of PR connections, material nonlinearity, loading and reloading behavior at the PR connections, and damping. Uncertainty in the parameters will be considered using a nonlinear stochastic finite element algorithm. Reliability analysis will be conducted to generalize the observations made during the experiments and deterministic analyses, and for codification of design. Serviceability requirements consistent with the strength requirements will then be formulated. Several definitions of local, interstory and global ductility will be investigated, particularly for the multiple degree of freedom structures, and the most appropriate definition will be identified. Commonly used steel frames including moment- residing frames, braced frames, dual systems with concentric and eccentric braces will be investigated. Design factors will be re-evaluated and introduced for the seismic design of steel frames with PR connections. The study will complement SAC's Phase II study on seismic analysis of steel framed structures which is funded by FEMA. The project will involve industry trade and associations such as the American Institute of Steel Construction (AISC) and the American Iron and Steel Institute (AISI). ***