{"fatigue": {"crit_eid": "696", "crit_location": {"x": 122.3455, "y": 16.218}, "sigma_range_MPa": [-143.53469924639788, -114.00829069548294], "sigma_std_MPa": 5.1067511516151525, "n_cycles": 509, "hist_edges": [0.0, 5.0, 10.0, 15.0, 20.0, 25.0, 30.0, 35.0], "hist_counts": [409, 53, 33, 12, 0, 2, 0], "ranges_above_25_MPa": 2, "max_range_MPa": 27.62179530071272, "JTG_Delta_D_MPa": 91.0, "damage_6_months": 2.1283874905998376e-09, "damage_per_year": 4.648372878525354e-09, "life_years": 100000.0, "life_years_raw": 215129041.0930285, "life_cap_years": 100000.0, "life_is_capped": true, "fatigue_scope": "hourly slow-varying stress from support/temperature inversion; vehicle stress cycles are not included", "validity_note": "This is a slow-varying stress damage screen, not a formal traffic fatigue life prediction.", "s_n_formula": "N = 2×10^6 · (91/Δσ)^3 [Class 60 双线性, JTG D64-2015 Ch.10]", "sigma_series_hint": "σ(t) 每小时，用于 rainflow 计数；小时级数据会过滤车辆高频循环"}, "overturning": {"summary": "连续梁 + 每墩 3 支座 + 支座横距 ±15m，倾覆几乎不可能（稳定比 >> 2.5）", "method": "静力法：M_抵抗 / M_倾覆。恒载 × y_max = 抵抗矩；2 车道极限偏载 × 5m 偏心 = 倾覆矩", "lift_risk_bearings": [{"label": "ZX1-M1", "R_min": 429.204, "safety_margin_pct": 64.84722682246104}, {"label": "ZX1-M2", "R_min": 3000.665, "safety_margin_pct": 89.54038694744439}, {"label": "ZX1-M3", "R_min": 455.747, "safety_margin_pct": 65.16584701454352}, {"label": "ZX2-M1", "R_min": 6429.223, "safety_margin_pct": 94.03257841856525}, {"label": "ZX2-M2", "R_min": 13529.217, "safety_margin_pct": 88.24743653365847}, {"label": "ZX2-M3", "R_min": 4027.6174975112003, "safety_margin_pct": 91.684126993693}, {"label": "ZX3-M1", "R_min": 7043.124, "safety_margin_pct": 95.2392944680985}, {"label": "ZX3-M2", "R_min": 13720.436, "safety_margin_pct": 87.02547116617484}, {"label": "ZX3-M3", "R_min": 5565.491, "safety_margin_pct": 93.33889785004475}, {"label": "ZX4-M1", "R_min": 562.775, "safety_margin_pct": 66.78055125123245}, {"label": "ZX4-M2", "R_min": 3299.916, "safety_margin_pct": 90.44082128636423}, {"label": "ZX4-M3", "R_min": 714.327, "safety_margin_pct": 76.12492451292974}], "all_bearings_always_compressed": true, "min_R_ever_kN": 429.204, "pier_stability": {"ZX1": {"y_bearings_m": [14.75, 2.0, -8.81], "y_max_m": 14.75, "R_mean_kN": 4712.420380699891, "M_resist_kNm": 69508.2006153234, "M_overturn_worst_kNm": 18000.0, "stability_ratio": 3.8615667008513}, "ZX2": {"y_bearings_m": [15.25, -0.086, -15.25], "y_max_m": 15.25, "R_mean_kN": 26561.15992938589, "M_resist_kNm": 405057.6889231348, "M_overturn_worst_kNm": 18000.0, "stability_ratio": 22.503204940174157}, "ZX3": {"y_bearings_m": [15.25, 0.0, -15.25], "y_max_m": 15.25, "R_mean_kN": 29123.857906638485, "M_resist_kNm": 444138.8330762369, "M_overturn_worst_kNm": 18000.0, "stability_ratio": 24.674379615346492}, "ZX4": {"y_bearings_m": [15.25, 0.0, -15.25], "y_max_m": 15.25, "R_mean_kN": 5429.786363500746, "M_resist_kNm": 82804.24204338637, "M_overturn_worst_kNm": 18000.0, "stability_ratio": 4.600235669077021}}, "JTG_D60_threshold": "JTG D60 4.1.7: 稳定系数 K ≥ 1.5 (ULS 反力矩)", "worst_K": 3.8615667008513, "verdict": "PASS"}}