Modeling of nonlinear behavior of steel beam to column semi-rigid connections with 3-d solid finite elements

Download
2013
Azap, Nurettin Murat
In steel structural systems, beam to column connections are usually assumed either rigid or pinned in practice. In reality rigid connections have some flexibility and shear connections have some rigidity incorporated in their real behavior with significant nonlinearity included, as well; thus this behavior results into the categorization of some connections as semi-rigid. Beam to column connection regions contain one or more of the following components: angles, plates, welds, and bolts. Understanding the physical actions occurring between all these parts is crucial. In this regards the development and use of numerical tools and also further experimental studies trying to identify the monotonic and cyclic behavior of semi-rigid connections have gained significant attention. Detailed modeling and analysis of structural members by using advanced finite element programs is very common nowadays. Conducting experiments may supplement verification of numerical simulations; however experimental works may not be practical in some cases. Despite the advance in computer technology, for the modeling of the complex interaction of geometric and material nonlinearities in steel semi-rigid connections the use of regular computers may not always suffice in terms of computer power and large amounts of analysis time is still needed. In this thesis 3-D finite element modeling and analysis of semi-rigid connections is undertaken, where for this purpose a special type of bolted beam to column connection is chosen due to its truly semi-rigid characteristic. Previous experiments conducted on this connection type in the last three decades are considered for the numerical study undertaken in this thesis. Results obtained from numerical simulations are compared with experimental data and the reliability of 3-D modeling of connections with the use of advanced nonlinear finite element programs is assessed. In order to model bolted beam to column connections accurately in a numerical simulation for all connection topologies, detailed understanding of the nonlinearities that need to be taken into account during the use of finite element software should be well known. In this regards, special attention has been given in this thesis for the presentation of how a bolted beam to column connection region shall be modeled, as well.

Suggestions

A Finite element model for partially restrained steel beam to column connections
Köseoğlu, Ahmet; Sarıtaş, Afşin; Department of Civil Engineering (2013)
In the analyses of steel framed structures it is customary to assume the beam to column connections as either fully rigid which means that all moments are transferred from beam to column with negligible rotation or ideally pinned that resists negligible moment. This assumption is reasonable for some types of connections. However when considering steel connections such as bolted-bolted double web angle connections it can be seen that the behavior of these connections is in between the two extreme cases. Thus...
A Parametric study on the influence of semi-rigid connection nonlinearity on steel special moment frames
Metin, Tolga; Sarıtaş, Afşin; Department of Civil Engineering (2013)
In practice, steel frames are analyzed and designed by assuming all beam to column connections as either rigid or simple. In real life, there are no such idealizations as rigid or simple and all connections would actually belong to a group of connections named as semi rigid connections. Various difficulties exist in modeling an accurate non-linear behavior of a steel structure, where one of these challenges is the modeling of semi-rigid behavior of connections. A detailed finite element model would take int...
Inelastic seismic response analysis and design of torsionally coupled systems
Kaatsız, Kaan; Sucuoğlu, Haluk; Department of Civil Engineering (2019)
Torsional coupling due to irregular placement of load resisting members and/or uneven mass distribution along a story plan is a very common phenomenon in structural systems. Unsymmetrical-plan buildings with stiffness and/or mass asymmetry behave considerably different compared to regular buildings when they are subjected to earthquake-induced forces. Modern earthquake resistant design related code provisions that employ capacity design principles aim to achieve a certain amount of ductility in the structur...
Optimal wind bracing systems for multi-storey steel buildings
Uslu, Cafer Harun; Sarıtaş, Afşin; Department of Civil Engineering (2009)
Two types of connection are generally considered in the design of steel structures in practice. These are classified as completely rigid (moment) and simple (shear) connections. In theory, completely rigid connections can not undergo rotation and simple connections can not transfer moment. However, in reality rigid connections have a relative flexibility which makes them to rotate and simple connections have some reserve capacity to transfer moments. In many modern design specifications, this fact is realiz...
Analysis of silo supporting ring beams resting on discrete supports
Zeybek, Ozer; Topkaya, Cem; Rotter, J. Michael (Elsevier BV, 2019-02-01)
Elevated cylindrical metal silos are often supported on a ring beam which rests on discrete column supports. The ring beam plays an important role in redistributing the majority of the discrete forces from the column supports into a more uniform stress state in the cylindrical wall, which is necessary to reduce the potential for buckling of the shell wall.
Citation Formats
N. M. Azap, “Modeling of nonlinear behavior of steel beam to column semi-rigid connections with 3-d solid finite elements,” M.S. - Master of Science, Middle East Technical University, 2013.