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Advances in Bridge Engineering

Table 3 Vertical deformation exceedance thresholds of Specifications 3 and 4

From: A novel hybrid model for bridge dynamic early warning using LSTM-EM-GMM

Calculation basis

Early warning level

Maximum warning threshold (mm)

Specification 3

Maximum vertical deflection

[-1200, 1200]

Specification 4

Second level

[-383.78, 174.08]

Third level

[-479.73, 217.60]

  1. Specification 3 requires the maximum warning value of bridge deflection is f ≤ l/400, where f is the maximum vertical deflection (±) and l is the main span length; Specification 4 sets the level 2 maximum warning threshold to 0.8 times the design value, and the level 3 maximum warning threshold is defined as reaching the design value or occurring more than 10 times within a month
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