Cyclic testing of replaceable damper: Earthquake-resilient prefabricated column-flange beam-column joint

Experimental investigation of new internal-diaphragm connections to CFT columns under cyclic loading

Detailing of I-beam-to-CHS column joints with external diaphragm plates for seismic actions

An innovative resilient rocking column with replaceable steel slit dampers: Experimental program on seismic performance

Ductile moment-resisting frames using cold-formed steel sections: An analytical investigation

I-beam to box–column connection by a vertical plate passing through the column

Moment-connection between I-beam and built-up square column by a diagonal through plate

Experimental study of a replaceable steel coupling beam with an end-plate connection

Box column is used as one of the most desirable sections between the designers in Iran and most Asian countries .this section as column has considerable benefits such as high biaxial bending strength and higher plastic to elastic section modulus ratio which is an effective factor for force controlled components .In typical beam to column connection for this type of column section , one need to provide horizontal continuity plates in box section which is challenge in construction phase and there is no chance to provide them in hot rolled box section . This paper elucidates the seismic behavior of through-plates moment connections to box columns for use in steel moment resisting frames. This connection has lot of economical benefits such as no need to horizontal continuity plates and satisfying the weak beam-strong column criteria in the connection region .they might serve as panel zone plates as well. According to high shear demand in panel zone of beam to column joint one should use the doublers plates in order to decrease the shear demand in this sensitive part of structure but this plates have no possibility to mobilize the load transfer mechanism in column web and transfer them to column flanges. Finite element analysis was conducted to elucidate the seismic behavior of this connection; the results of finite element analysis established the effectiveness of the through plate in mitigating local stress concentrations and forming the plastic hinge zone in the beam away from the beam to column interface. The moment rotation hystersis graphs from sub-assemblage show a desirable seismic performance of this connection .the seismic behavior of this connection also has been investigated in diamond box columns.

Numerical Evaluation of Through Plate Beam to Box Column Connection

Reduced beam section (RBS) moment resisting connections are among the most economical and practical rigid steel connections for high rise buildings that developed after the 1994 Northridge, earthquake. Section weakening concept in the plastic hinge region of beam cause to reduction of beam plastic section modulus in this region, and force plastic hinge to occur within the reduced section. In the ordinary RBS connection mostly portions of the beam flanges are selectively trimmed in the region adjacent to the beam-to-column connection that causes the plastic hinge to form in weakening section. This paper presents a new RBS connection that has been used aforesaid weakening concept in it, with this difference that corrugated plate webs instead of beam flange cutting were used in limited specific length near the column face. Corrugated plates because of their accordion effect don’t have bending rigidity. Then using of these plates in plastic hinge region reduces the beam plastic section modulus and plastic hinge is formed in corrugated region. For investigating the seismic behavior and performance of new RBS moment connection, finite element analyses were executed. All of the analytical results of new RBS connection were compared with ordinary RBS connection results. This comparison shows that the corrugated webs will improve the plastic stability and provide capability of large plastic rotation at the plastic hinge location without any appreciable buckling and brittle fractures in this region. Comparison of the seismic performance of new RBS connection with ordinary reduced beam section connection (dogbone connection) led to the conclusion that new RBS connection allows for the most stable motonic response at large story drift levels.

Numerical Evaluation of New Reduced Beam Section Moment Connection

Farhad Keshavarzi

Papers

I-beam to box–column connection by a vertical plate passing through the column

Moment-connection between I-beam and built-up square column by a diagonal through plate

Experimental study of a replaceable steel coupling beam with an end-plate connection

Numerical Evaluation of Through Plate Beam to Box Column Connection

Numerical Evaluation of New Reduced Beam Section Moment Connection