Midas Civil numerical analysis model is the structural model abstraction described in the Midas-Civil-Analysis-Reference: nodes locate the structure, finite elements convert members and continua into numerical data, and boundary conditions describe connection to adjacent bodies or supports.
How It Works
The manual emphasizes three coordinate layers. Global coordinates define the model reference frame. Element coordinates define member or element-local quantities. Node local coordinates let users prescribe constraints, boundary springs, displacements, and reactions in arbitrary directions.
The model is intentionally simplified from the real structure. The manual's practical warning is that simplification must stay inside the analysis purpose: element type, mesh idealization, member offsets, boundary assumptions, and local axes can strongly change the computed response.
Solver Development Notes
Input data should separate nodes, element connectivity, element type, material, stiffness/section data, and boundary/link definitions.
Coordinate transformations are first-class data, not postprocessing details.
A custom solver needs diagnostics for missing stiffness, inconsistent local axes, overconstraints, and boundary assumptions.
Verification should include model-equivalence checks: same physical bridge member modeled with different element or offset choices should be compared intentionally.
김경종