A novel approach to model a nonlinear frame element with semi-rigid connections in OpenSees structural analysis program

Date

2023-8-18

Author

Türkbey, Memduh Ümit

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Steel moment frames are structural systems composed of prefabricated steel elements assembled at the site. When a multistorey steel moment frame is exposed to an excessive lateral excitation that causes the yielding of the steel material, inelastic deformations develop along the length of column and beam members, as well as on the connection regions between the beams and columns, and columns and base supports. In the conventional approach used to model this plasticity mechanism in a computer-aided structural analysis, the yielding state of beam elements and the adjacent beam-to-column connections are separately computed at each time step by analyzing the current non-linear material and geometric behavior of each element, and the resulting forces are summed up to compute the nodal response of the structure. As an alternative to the conventional approach, in the scope of this thesis, a new beam integration method, which eliminates the need to model the beam element and its adjacent semi-rigid beam-to-column connections separately and combines their nonlinear responses in a numerical integration rule, is introduced as a new proposed approach to the structural modeling in OpenSees. And the advantages of using this proposed approach in nonlinear structural analysis are demonstrated by making various comparisons to conventional models.

Subject Keywords

Semirigid, Connections, Rotational, Integration, OpenSees

URI

https://hdl.handle.net/11511/105257

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Graduate School of Natural and Applied Sciences, Thesis