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

由混凝土填充管（CFT）柱与相对薄壁钢管组成的组合结构，已在美国和远东地区的建筑施工中得到应用。一般来说，在这种类型的建筑中，钢梁被框架到每层的这些柱上。钢梁与CFT柱连接的细节和设计标准几乎不存在。这个项目的总体目标是制定一个经济的连接细节，将钢梁连接到CFT柱，并提供相应的设计规定。本次调查的重点是开发全约束（FR）型钢连接细节，用于10至20层楼高的建筑物的CFT柱，以及根据“NEHRP制定新建筑物抗震法规的建议规定”定义的抗震性能类别D和E。连接细节的选择和设计规定开发将考虑以下问题:a)水平的延性,b)经济和施工能力,c)避免在强调的钢壳部分CFI列,d)预防损伤的共同区域列通过塑性铰的位置移动到安全距离列的脸,e)利用复合混凝土板和钢梁之间的行动。至少有两种结构构型将被研究。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。本文的研究成果将填补这一技术空白，加快复合结构在建筑行业的应用。本项目为国家科学基金94- 154 CIS招标项目“复合材料和混合结构的研究”。

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".