Development of Detail and Design Criteria for Steel Beam to Concrete Filled Tube Column Connections in Seismic Regions

9520280 Azizinamini由相对薄壁钢管的混凝土填充管（CFT）柱组成的组合结构已经在美国和远东的建筑结构中使用。 一般来说，在这种类型的建筑中，钢梁在每个楼层都被框架到这些柱上。 连接钢梁和钢管混凝土柱的细节和设计标准几乎不存在。 本项目的总体目标是为连接钢梁和钢管混凝土柱开发一种经济的连接详图，并提供相应的设计规定。 本调查的重点是为10至20层高的建筑物的CFT柱开发完全约束（FR）型钢连接详图，并根据“NEHRP新建筑抗震法规制定建议规定”定义抗震性能类别D和E。 待选择的连接详图和待制定的设计规定将考虑以下问题：a）延性水平，B）经济性和可施工性，c）避免对CFI柱的钢壳部分施加过度应力，d）通过将塑性铰的位置移动到远离柱表面的某个安全距离来防止柱的接合区域的损坏，e）利用混凝土板和钢梁之间的组合作用。 将研究至少两种结构配置。 将进行考虑不同地面运动的静态和动态线性和非弹性分析，以确定连接所需的延性水平。 将进行有限元分析和实验研究，以制定连接细节和设计规定。 本研究的结果应填补这一技术空白，加快复合材料结构在建筑业的接受。 本课题是NSF 94- 154“复合材料与混合结构研究”的CIS征集项目。

9520280 Azizinamini Composite construction consisting of concrete filled tube (CFT) columns with relatively thin-walled steel tubes, has been used in building construction in U.S. and Far East. In general, in this type of construction, steel beams are framed to these columns at each floor level. Detail and design criteria for connecting steel beams to CFT columns are almost non existent. The overall objectives of this project are to develop an economical connection detail for connecting steel beams to CFT columns and provide accompanying design provisions. The focus of this investigation is to develop the Fully Restrained (FR) type steel connection detail for CFT columns for buildings ranging from 10 to 20 stories high and for seismic performance categories D and E defined per "NEHRP Recommended Provisions for the Development of Seismic Regulations for New Buildings". The connection detail to be selected and design provisions to be developed will give consideration to the following issues: a) level of ductility, b) economy and constructability, c) avoiding over stressing the steel shell portion of the CFI columns, d) preventing damage to the joint region of the column by moving the location of the plastic hinge to some safe distance away from the column face, e) taking advantage of composite action between the concrete slab and the steel beam. At least two structural configurations will be investigated. static and dynamic linear and inelastic analyses considering different ground motions will be conducted to establish a level of ductility required for the connection. Both finite element analysis and experimental study will be carried out to develop the connection detail and design provisions. Results of this research should fulfill this technology gap and expedite acceptance of composite structures in construction industry. This is a project supported under NSF 94- 154 a CIS Solicitation "Research on Composite and Hybrid Structu res".