Structure OS
Assembling stiffness matrix
STRUCTURE OS — Real-Time Finite Element Analysis · Direct Stiffness Method
-- FPS
WEBGL2 · DSM
Structure
STORIES 5
BAYS X 3
BAYS Z 2
Load Case
INTENSITY 1.0×
Modal Analysis
View
DEFORM SCALE auto
Solver Metrics
NODES / MEMBERS--
FREE DOF--
HALF-BANDWIDTH--
ASSEMBLE--
FACTOR L·Lᵀ--
SOLVE + MODES--
Response
MAX DISPLACEMENT--
MAX DRIFT--
MAX UTILIZATION--
BASE SHEAR--
STEEL MASS--
T₁ FUNDAMENTAL--
Structural Intelligence
NEXUS · SI DIAGNOSIS
Utilization σvm/φFy
100%75%50%25%0%
DRAG orbit  ·  WHEEL zoom  ·  RIGHT-DRAG pan  ·  SPACE animate  ·  1–6 modes  ·  L load case  ·  D deform  ·  R reset  ·  ? keys

Structure OS — Controls

DRAGorbit camera
WHEELzoom
RIGHT-DRAG / SHIFTpan target
SPACEplay / pause mode animation (auto-orbit in static)
1 – 6animate mode shape 1–6 at true frequency ratios
0 / ESCreturn to static results
Lcycle load case
Dtoggle deformed shape
S / G / Fstress map / ghost frame / load vectors
+ / −deformation scale
Aauto orbit
Rreset camera
Elastic first-order analysis · 3D Euler–Bernoulli beam elements (12 DOF) · banded Cholesky LLᵀ · lumped-mass inverse-iteration eigensolver · ASCE-style equivalent lateral force with computed T₁ · W14×90 columns / W18×50 girders, A992 steel. P-Δ, connections and member buckling out of scope.