Finite element modelling for static behaviour analysis of suspension bridges with varying rigidity of main cables

Abstract

The paper presents a summary of numerical analysis on static behaviour of suspension bridges with varying rigidity of cables. The primary purpose of this study was to compare suspension systems with flexible and rigid cables and to determine the influence of varying rigidity of cables on the response of bridge members under the action of uniformly distributed symmetrical and unsymmetrical static loading. The finite element analysis of a three-dimensional bridge model was performed. In the first model, the cable is modelled as TRUSS3D element, in the second model as BEAM3D element. In both models, the hangers and backstays are TRUSS3D elements and stiffening girder as BEAM3D element. It is shown that a suitable increase of main cable's bending stiffness can effectively reduce the displacements, internal forces and stresses of suspension systems. Recommendations for appropriate stiffness are given.

Simplified Method of Determination of Natural-Vibration Frequencies of Prestressed Suspension Bridge

“…The elastic displacements are maximal at the centre of span in case of symmetrical load application. The kinematic displacements are caused by initial parabolic shape change, resulting from non-symmetrical or local loads [6][7], see Fig. 1.…”

Stability and Ductility of Structures

“…While mentioning publications prepared for the last 5 years, the following ones are worth being quoted: Doleček et al 2009;Grigorjeva et al 2008;Kala et al 2005;Kreja et al 2005;Kudzys and Kvedaras 2006;Kudzys andKliukas 2008a, 2008b;Kudzys 2009;Kuranovas et al 2009;Malesza and Miedzialowski 2006;Mang et al 2009;Mazzolani et al 2009;Samofalov and Šlivinskas 2009;Šapalas et al 2005;Zergua and Naimi 2006;Žiliuklas et al 2006;Žiliukas 2008.…”

Static Analysis and Simplified Design of Suspension Bridges Having Various Rigidity of Cables

“…The cross sections of the rigid cable and stiffening girder are selected and the dead load is computed. The rigid cable shape and initial sag can be determined according to recommendations given in the author's reference (Grigorjeva et al 2004).…”

“…Similar approach can be used for suspension bridges with stiffened cables. Although any of the well-known theories are complex and involves several procedures and approximations, a new concept of solving displacement equation in the analysis of suspension systems with stiffened cables is given by the authors in reference (Grigorjeva et al 2004). The primary objective of the proposed method is to give a simplified and adaptable design procedure to provide design aids for suspension system evaluation and practical recommendations.…”

“…Two outside spans are carried on two pairs of stout chains united by powerful ties. To give the suspension bridge more stable appearance, the authors also proposed to use the cables of varying bending stiffness (Grigorjeva et al 2004).…”