Connection of I-beam to box-column by a short stub beam. (December 2016)

• Record Type: Journal Article
• Authors: Erfani, Saeed; Asnafi, Ahmad Ali; Goudarzi, Alireza
• Is Part Of: Journal of constructional steel research. Volume 127(2016:Dec.)
• Page Start: 136
• Page End: 150
• Publication Date: 2016-12
• Subjects: AISC American Institute of Steel Construction -- ASTM American Society of the International Association for Testing and Materials -- bf Width of beam flange -- bp Width of end-plate -- db Depth of connecting beam -- dbt Bolt diameter -- dc Depth of column -- CJP Complete-Joint-Penetration -- Fy Specified minimum yield stress of the yielding element -- Fu Specified minimum tensile strength of the yielding element -- g Horizontal distance between bolts -- Gr Grade -- Lp Length of end-plate -- Lb Length of beam -- M0.04 The measured flexural resistance of the connection, determined at the column face at a story drift angle of 0.04 rad -- M− 0.04 The measured flexural resistance of the connection, determined at the column face at a story drift angle of − 0.04 rad -- Mmax The maximum measured flexural resistance of the connection, determined at the column face -- Mp Nominal plastic flexural strength -- Mpb Expected flexural strengths of the beams -- Mpc Nominal flexural strengths of the columns -- Pb Vertical distance between the inner and outer row of bolts in an 8ES connection -- Pf Vertical distance from the beam tension flange to the nearest bolt row -- Pf bott Vertical distance from the beam tension flange to the nearest bottom bolt row -- Pf top Vertical distance from the beam tension flange to the nearest top bolt row -- SAC Structural engineers association of California-Applied technology council-California universities for research in earthquake engineering -- tc Thickness of column flange and web -- tf Thickness of beam flange -- tp Thickness of end-plate -- tw Thickness of beam web -- Zx Plastic section modulus about the x-axis -- θM max Total rotation corresponding to maximum load carrying capacity; Box-column -- Moment connection -- End-plate -- Bolt -- Stub beam -- Link beam; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2016.07.025
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: Box-columns are frequently used in moment resisting frames due to the numerous advantages they offer. Accordingly, bolted extended end-plate moment connections are widely used in steel structures due to their advantages such as easy fabrication and fast erection. However, some problems such as inaccessibility to the inside of box-columns for assembling the continuity plates as well as fastening the bolts prevent the wide applications of these connections to connect I-beams to box-columns. The present study aims to solve these problems by proposing two new connection configurations. In these connection models, a short stub beam is used to connect I-beams to box-columns by bolted end plate connection. These connection models have different force transfer mechanisms so that the use of continuity plates should be necessary for the first model while it can be omitted in the second model. The behavior of these connection models is investigated under cyclic loading by using finite element method. To validate modeling techniques used in this study including the mesh and element types, material properties and contact elements, the numerical results of an end-plate connection model are compared with experimental data. Then, for each connection model, eight specimens including four-bolt unstiffened and eight-bolt stiffened extended end-plate connections are analyzed under cyclic loading. All the specimens studied in this program were shown to undergo the 0.05 rad total story drift with the AISC seismic provision requirements being satisfied. Highlights: Two new connection configurations are proposed to connect I-beams to box-columns. The two configurations are different in force transfer mechanism. The behavior of these connection models is investigated under cyclic loading using finite element method. The modeling method was verified against experimental results The analysis results approved that the proposed connections are satisfying AISC seismic provisions.