Consistent Criteria for Seismic Design of Weak Column StrongBeam Steel Frames

本项目探讨了弱柱-强梁（WCSB）弯矩框架在抗震设计中的应用。最近对这种钢框架的分析研究表明，与类似的强柱弱梁（SCWB）结构相比，WCSB框架可能大大增加了延性需求，降低了可用延性。这就提出了一个问题，即这些最近的变化是否保守。在这项研究中，合理的准则设计框架与WCSB配置将开发。本文将分析不同高度和几何形状的钢结构框架在不同的抗震设计准则和加速度记录下的非弹性抗震性能。分析将考虑和比较WCSB框架、类似的SCWB框架和在隔离层或单柱线上有弱柱的框架的响应。将计算和比较各种条件下的延性需求，并将比较出一些条件以供进一步的实验评估。研究结果将更好地理解弱柱框架的行为，并为改进设计程序提供基础。该研究提案已在1988年6月18日通过的一项决议中得到了加州结构工程师协会（SEAOC）地震学委员会的支持，并正在等待SEAOC州董事会对该支持的正式批准。它还得到了美国钢铁协会（AISI）抗震建筑规范委员会的支持，该委员会将成立一个咨询小组来进行这项研究。由于该课题的现实意义，包括加州结构工程师协会（SEAOC）在内的几个专业工程协会和规范委员会认可了这项研究。

This project investigates the use of weak column-strong beam (WCSB) moment frames for seismic resistant design. A recent analytical study of such a steel frame indicates that WCSB frames may have greatly increased ductility demand and reduced available ductility over that obtained in comparable strong column-weak beam (SCWB) structures. This raises a question as to whether these recent changes are conservative. In this study rational guidelines for the design of frames with the WCSB configuration will be developed. The inelastic seismic behavior of steel building frames of different heights and geometry subjected to different seismic design criteria and acceleration records will be analyzed. The analyses will consider and compare the response for WCSB frames, comparable SCWB frames, and frames with weak columns at isolated stories or single column lines. The ductility demand will be computed and compared for the various conditions, and the comparison will isolate a few conditions for further experimental evaluation. The results will provide a better understanding of the behavior of weak column frames and form a basis for improved design procedures. This research proposal has received the support of the Structural Engineers Association of California (SEAOC) Seismology Committee in a resolution passed June 18, 1988, and formal approval of this support by the SEAOC State Board of Directors is pending. It is also supported by the American Iron and Steel Institute (AISI) Seismic Building Codes Committee, and this committee will establish an Advisory Panel for the conduct of the research. Several professional engineering associations and code committees including the Structural Engineers Association of California (SEAOC) endorsed this study due to the practical significance of the subject.