Elastic buckling and vibration analysis

Features:

NIDA provides verstile nonlinear solution methods

Seismic evaluation (response spectrum, pushover, time-history)

Large deflection analysis of shell structures

Load and construction sequences analysis

Plastic hinge method

Semi-rigid connection

Elimination of effective length assumption

Consideration of P-Δ, P-δ effects and initial imperfections;

Second-order (Direct) analysis to CoPHK / BS 5950 /Eurocode3

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Elastic buckling and vibration analysis

Eigenvalue bucking analysis

Eigenvalue bucking analysis is used to determine the buckling modes and elastic buckling load factors of a structure.

Elastic critical load factor l is defined as ratio of elastic buckling load to design load.

Modal analysis

Modal analysis is used to determine the undamped free-vibration mode shapes and natural frequencies of a structure. Modal analysis is used as the basis for modal superposition in response-spectrum and modal time-history analysis cases. Both lump mass and consistent mass assumptions are allowed to form the mass matrix.