Numerical and experimental study of the BUEEP connection using an inner box

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Numerical and experimental study of the BUEEP connection using an inner box

Seyed Mahdi Rafiei Tekieh a, Amir Peyman Zandi a,*, Malek Houshang Pashaei b
a Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran
b Structural Engineer, Ista Gouya Consulting Engineers, Tehran, Iran
A R T I C L E I N F O
Keywords:
Inner box
Continuity plate
Box-column
Moment steel connection
Bolted extended end-plate connection
Cyclic test
A B S T R A C T
In this paper, a prefabricated part called Inner Box is proposed to be embedded in box-columns at the connection
zones to solve the well-known problems of the box-column connections, namely the inaccessibility of the interior
side of the box-columns for both continuity plates welding and bolt tightening. The inner box contains four sideplates
and two continuity plates assembled like a cube. Nuts are encased with specially designed gadgets welded
to inner box side-plates preparing for a direct bolted connection. Fabrication, nondestructive tests, and repairs of
typical inner boxes are practically and economically justified. For optimization study on IB dimensions, nonlinear
finite element modeling is used. Then a full-scale specimen of the optimized connection is tested under
cyclic loading. Test results, according to AISC 341–22, approve the connection’s seismic qualification in the
range of the tested dimensions. The test specimen and FEM models show good agreement. Finally, some design
criteria are proposed by numerical sensitivity studies.

 

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