Structure analyzing method, device, and non-transitory computer-readable medium

A structure analyzing device, characterized in that a hardware processor is configured to implement a process, comprising:

• establishing a spatial-temporal discrete governing model comprising an equivalent nodal secant damping coefficient and an equivalent nodal secant stiffness coefficient at a current time step for a discontinuous nonlinear structure based on a finite element analysis;
• repeatedly calculating until convergence a secant damping coefficient slope and a secant stiffness coefficient slope based on known parameters, the known equivalent nodal secant damping coefficient and the known equivalent nodal secant stiffness coefficient at a previous time step through a computer iteration algorithm performed by the hardware processor;
• and
• replacing the equivalent nodal secant damping coefficient and the equivalent nodal secant stiffness coefficient by the converged secant damping coefficient slope and the converged secant stiffness coefficient slope acting as initial values for a next time step.

A non-transitory computer-readable medium storing a program causing a computer to execute a process, comprising:

• establishing a spatial-temporal discrete governing model comprising an equivalent nodal secant damping coefficient and an equivalent nodal secant stiffness coefficient at a current time step for a discontinuous nonlinear structure based on a finite element analysis;
• repeatedly calculating until convergence a secant damping coefficient slope and a secant stiffness coefficient slope based on known parameters, the known equivalent nodal secant damping coefficient and the known equivalent nodal secant stiffness coefficient at a previous time step through a computer iteration algorithm performed by the computer;
• and
• replacing the equivalent nodal secant damping coefficient and the equivalent nodal secant stiffness coefficient by the converged secant damping coefficient slope and the converged secant stiffness coefficient slope acting as initial values for a next time step.