Free-interface Component Mode Synthesis Technique with Link Substructure as Super-element

Abstract:

According to the definition of link substructure in component mode synthesis (CMS) method,link substructure is essentially a kind of super element with the interface degree of freedoms(DOFs).A new technique of free-interface CMS,compatible for both displacement and force on interfaces,was then presented,by transforming link substructure into super element with Guyan static condensation or dynamic condensation.The new technique not only retains free-interface CMS’s advantages of reducing the system DOF efficiently and high accuracy,but also can deal with lumped damping reasonably,thus,it has a widespread application in dynamic analysis of the structures with local non-linearity.Then,the application of the proposed technique was shown by modal and seismic response analysis of a truss bridge in which the girder and brace are lead rubber bearings (LRB) linked.Regarding LRB as super element link substructure,the calculation accuracy and efficiency of Guyan and dynamic condensation methods are compared with finite element method (FEM) or direct integration method.Furthermore,inherent characteristic results of the truss bridge under different LRB disposition forms were obtained.