Structural Coupling of Two Nonlinear Structures

2015-02-02
Tepe, Çağrı
Ciğeroğlu, Ender
In mechanical design, modeling and analysis of a complex structure can be simplified with dividing the structure into substructures; therefore, any change in the structure can be addressed easily which is referred as “structural coupling”. Utilization of proper coupling techniques, it is possible to understand the behavior of the whole structure by considering the behavior of its substructures. For linear structures, coupling is a common technique; however, in most of the engineering structures, nonlinearities are also encountered; therefore, it is required to extend linear coupling methods to nonlinear systems. Although, there exists studies on nonlinear coupling, existing methods are limited to coupling of structures where one substructure is linear and the other is nonlinear or two linear substructures coupled with a nonlinear element. In this paper, a structural coupling method is proposed to couple two-nonlinear substructures. Similar to linear coupling methods, the proposed method considers the compatibility of internal forces at the connection degrees of freedom in addition to displacements. Since, the substructures are nonlinear, the resulting system of nonlinear differential equations are converted into a set of nonlinear algebraic equations by using Describing Function Method, which are solved by using Newton’s method with arc-length continuation.
Structural Coupling of Two Nonlinear Structures, XXXII: Conference & Exposition on Structural Dynamics, 2 - 05 Şubat 2015

Suggestions

Structural coupling of two nonlinear structures
Tepe, Çağrı; Ciğeroğlu, Ender; Department of Mechanical Engineering (2018)
In mechanical design, modelling and analysis of a complex structure can be simplified with dividing the structure into substructures; therefore, any change in the structure can be addressed easily which is referred as “structural coupling”. Utilization of proper coupling techniques, it is possible to understand the behavior of the whole structure by considering the behavior of its substructures. For linear structures, coupling is a common technique; however, in most of the engineering structures, nonlineari...
Nonlinear Structural Coupling: Experimental Application
Kalaycioglu, Taner; Özgüven, Hasan Nevzat (2014-02-06)
In this work, the nonlinear structural modification/coupling technique proposed recently by the authors is applied to a test system in order to study the applicability of the method to real structures. The technique is based on calculating the frequency response functions of a modified system from those of the original system and the dynamic stiffness matrix of the nonlinear modifying part. The modification can also be in the form of coupling a nonlinear system to the original system. The test system used i...
Harmonic Response of Large Engineering Structures with Nonlinear Modifications
Kalaycioglu, Taner; Özgüven, Hasan Nevzat (2011-07-06)
In a structural design, the structure may need to be modified and for each modification its dynamic characteristics may need to be determined by reanalyzing the structure dynamically. Since computational time and cost are very critical in design processes, structural modification methods become decisive, particularly for large systems, in predicting the dynamic behavior of modified structures from those of the original and modifying structures. Due to nonlinearity in most engineering structures, linearity a...
FINITE-ELEMENT ANALYSIS OF PRESTRESSED AND REINFORCED-CONCRETE STRUCTURES
ELMEZAINI, N; CITIPITIOGLU, E (American Society of Civil Engineers (ASCE), 1991-10-01)
A practical and powerful technique for the discrete representation of reinforcement in finite element analysis of prestressed and reinforced concrete structures is presented. Isoparametric quadratic and cubic finite elements with movable nodes are developed utilizing a correction technique for mapping distortion. Reinforcing bars and/or prestressing tendons are modeled independently of the concrete mesh. Perfect or no bond as well as any bond-slip model can easily be represented. The procedure is succes...
Modeling of the nonlinear behavior of steel framed structures with semi rigid connections
Sarıtaş, Afşin; Özel, Halil Fırat (null; 2015-07-21)
A mixed formulation frame finite element with internal semi-rigid connections is presented for the nonlinear analysis of steel structures. Proposed element provides accurate responses for spread of inelasticity along element length by monitoring the nonlinear responses of several crosssections, where spread of inelasticity over each section is captured with fiber discretization. Each material point on the section considers inelastic coupling between normal stress and shear stress. The formulation of the ele...
Citation Formats
Ç. Tepe and E. Ciğeroğlu, “Structural Coupling of Two Nonlinear Structures,” presented at the Structural Coupling of Two Nonlinear Structures, XXXII: Conference & Exposition on Structural Dynamics, 2 - 05 Şubat 2015, 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82660.