Application of BP Neural Network Improved by Fireworks Algorithm on Suspender Damage Prediction of Long-Span Half-Through Arch Bridge

Table 2

Corrosion condition of anchor head.

Anchor head number		Damage type
		Condensation inside the protective cover and on the top of the anchor cup cover	Water accumulation in anchor cup	Rust degree of anchor cup	Volatility of butter	Rust degree of steel wire pier head
Upstream upper anchor head	UT3	Not have	Not have	Mild	Serious	Whitening
	UT4	Have	Many	Mild	Serious	Mild
	UT7	Have	Many	Mild	Serious	Mild
	UT8	Not have	Not have	Mild	Serious	Whitening
	UT10	Have	Many	Mild	Serious	Mild
	UT14	Have	Many	Mild	Serious	Mild
	UT20	Have	Few	Mild	Serious	Whitening
	UT26	Have	Many	Mild	Serious	Mild
	UT30	Have	Many	Mild	Serious	Mild
	UT38	Have	Few	Mild	Serious	Whitening
	UT41	Have	Many	Mild	Serious	Mild
	UT46	Have	Many	Mild	Serious	Mild
	UT47	Not have	Not have	Mild	Serious	Whitening
	UT51	Have	Many	Mild	Serious	Mild
	UT54	Not have	Not have	Mild	Serious	Whitening
	UT59	Not have	Not have	Mild	Serious	Whitening
Downstream upper anchor head	DT3	Not have	Not have	Mild	Serious	Whitening
	DT4	Have	Many	Mild	Serious	Mild
	DT6	Not have	Not have	Mild	Serious	Whitening
	DT10	Not have	Not have	Mild	Serious	Whitening
	DT14	Have	Few	Mild	Serious	Whitening
	DT20	Have	Few	Mild	Serious	Whitening
	DT21	Have	Many	Mild	Serious	Mild
	DT27	Have	Many	Mild	Serious	Mild
	DT31	Have	Many	Mild	Serious	Mild
	DT36	Have	Many	Mild	Serious	Mild
	DT40	Have	Many	Mild	Serious	Mild
	DT44	Have	Many	Mild	Serious	Mild
	DT48	Have	Few	Mild	Serious	Whitening
	DT51	Not have	Not have	Mild	Serious	Whitening
	DT55	Not have	Not have	Mild	Serious	Whitening
	DT58	Have	Many	Mild	Serious	Mild
Upstream lower anchor head	UB1	Not have	Not have	Mild	Serious	Whitening
	UB30	Have	Many	Mild	Serious	Mild
	UB60	Have	Few	Mild	Serious	Whitening
Downstream lower anchor head	DB1	Have	Not have	Mild	Serious	Whitening
	DB30	Have	Many	Mild	Serious	Mild
	DB60	Have	Few	Mild	Serious	Whitening