LIVE ASSESSMENT
—
Long-Span Structural Integrity Index
—
LSII
—
LOADING…
LSII = 0.35·(β/β_t) + 0.30·(1−D)
+ 0.20·R_struct + 0.15·(λ_cr/λ_t)
Accuracy ±2.94% · Forecast 24–48h
Safety Bounds — Real-Time
Reliability β
—
≥ 3.50 target
Fatigue D_max
— M
< 0.80 limit
Buckling λ_cr
—
≥ 2.00 margin
Redundancy R
—
≥ 0.70 bound
Module Outputs — Current Cycle
ΔF Redistrib.
— %
DLRM nominal
P_f Failure
—×10⁻⁴
LSSAM within
DCR Collapse
—
≤ 2.00 (GSA)
LSTM +48h
—
AISL forecast
Span Member Force Map — Cable-Stayed Bridge
M1 M2 — HOT-SPOT M3 P1 P2 → V_wind
━ OK member ━ Elevated cable K·u = f
Load Redistribution — ΔF / F_nominal
M1 — Side span—
M2 — Main span (hot-spot)—
M3 — Far side span—
Four-Module Assessment Pipeline — DLRM · LSSAM · FARM · AISL
DLRM
Dynamic Load
Redistribution Module
—
R_struct
—
ΔF_max
—
Members
42
LSSAM
Long-Span Stability
Assessment Module
—
β index
—
λ_cr
—
θ P-Δ
—
FARM
Fatigue Accumulation
& Reliability Module
—
D_max
—
FAT class
FAT90
Cycles/h
—
AISL
AI-Assisted
Support Layer
—
Model
XGB+LSTM
+48h LSII
—
Conf.
—
LSII — 72-Hour History & 48-Hour AISL Forecast
Direct stiffness + FARM + LSSAM composite · Governance thresholds · Physics-constrained LSTM projection
0.65 CRITICAL0.75 MITIGATION0.90 MONITORINGSTEADY STATE
Fatigue Damage Map — D(x,t)
30 instrumented connections · Palmgren–Miner · IIW hot-spot · FAT90
D<0.300.30–0.60>0.60Goodman corr.
48h AISL Trajectory Forecast
XGBoost anomaly + physics-constrained LSTM · ±σ band
0.800.901.00 NOW
T+0hT+12hT+24hT+36hT+48h
Governing Equations
LOAD-SPAN v1.0.0 analytical core
Eq. 1 — Global Stiffness · Force Redistribution
K · u = f → ΔF_member = K_m · Δu_m
Eq. 2 — Euler Critical Load (Buckling)
P_cr = π² · E · I / (K · L)²
Eq. 4 — Cornell–Hasofer–Lind Reliability
β = (μ_R − μ_S) / √(σ_R² + σ_S²) → P_f = Φ(−β)
Eq. 6 — Long-Span Structural Integrity Index
LSII = 0.35·(β/β_t) + 0.30·(1−D)
        + 0.20·R_s + 0.15·(λ_cr/λ_t)
Safety Bounds & Governance Thresholds
SPAN-SAFETY-01 · v1.0.0 certification bounds
ParameterCurrentBoundStatus
LSII—≥ 0.90Steady
β index—≥ 3.50OK
D_fatigue—< 0.80OK
λ_cr—≥ 2.00OK
R_struct—≥ 0.70OK
DCR (GSA)—≤ 2.00Watch
P_f—< 1×10⁻³OK
Validation v1.0.0
LSII Accuracy±2.94%β Detection94.9%Fatigue MAE2.53%λ_cr Error±3.9%