model elastomeric bearing in midas civil

Step 1: Defining Properties of Non Linear Links Model -> Boundaries -> General Link Propertiesīase Isolators: Lead Rubber Bearing Isolator Friction Pendulum System Isolator R(x,xa) : Viscous Damping Fs(x): Variable Stiffness The response spectrum analysis uses the natural periods from the eigenvalue analysis. D) Effective modal mass.Įigenvalue analyses must precede dynamic analyses such as Modal Time History analysis or Response spectrum analysis. Step 2: Eigen Value Analysis Results A) Natural modes (or mode shapes) B) Natural periods (or frequencies) C) Modal participation factors. To convert the final stage Cable forces to be used for determining cable stiffness for the Eigen Value Analysis The Ritz Vectors are generated reflecting the spatial distribution or the characteristics of the dynamic loading. Ritz Vectors Unlike the natural eigenvalue modes, load dependent Ritz vectors produce more reliable results in dynamic analyses with relatively fewer modes.

Using influence coefficient to reanalyze construction stage Set constraints and calculate unknown load factor by step The unknown load factor can take that into consider and the program can perform iterations to find the pretension in the cable which will include the time dependent effect. The material Properties changes with time and the cable pretension force depends on the creep. Unknown Load Factor With Time Dependent Materials Lack of Fit Force: It calculates the additional pretension required for cable installationħ. Implication with Forward Construction Stage Analysis What is Unknown Load Factor ? Ans: It is a feature with which you can calculate the cable pretension force that would satisfy certain constraints in terms of displacements, bending moments etc.Ĭheck the Design forces for the deck, pylon and cables and modify.īridging Your Innovations to Realities Cable Stayed Bridge Height of Pylonsĭetermination of Cable Forces 1. Steps of Design : Determination of Cable Forces for FullyĬheck for Resisting Moments of Deck and Pylon Section

Elastic Catenary CableĬable Bridges are highly indeterminate structures:Ĭhange of Cable Stiffness with Pretension High IndeterminacyĬable Shape and pretension are in turn dependent on the load applied on the cable.: Load AppliedĬable Stiffness can be determined as per the following two techniques: 1.

Stiffness of the cable is dependent on : 1. Cable Tension Forces in Construction Stagesīridging Your Innovations to Realities Project Applications

Model elastomeric bearing in midas civil