A Seismic Demand Model for Bridges Based on IM and EDP Parameter Matching and Bidirectional Optimization

Table 3

List of selected 24 IMs.

Number	Abbreviation	Definition	Number	Abbreviation	Definition
1	PGA	Max acceleration	13	VSI	Velocity spectrum intensity
2	PGV	Max velocity	14	IH	Housner intensity
3	PGD	Max displacement	15	SMA	Sustained maximum acceleration
4	PGV/PGA	Vmax/Amax	16	SMV	Sustained maximum velocity
5	Arms	Root-mean-square of acceleration	17	EDA	Effective design acceleration
6	Vrms	Root-mean-square of velocity	18	MIV	Max incremental velocity
7	Drms	Root-mean-square of displacement	19	IP	Impulsivity index
8	IA	Arias intensity	20	SAavg	Average spectral acceleration
9	IC	Characteristic intensity	21	SA (T1)	Spectrum acceleration at T1
10	SED	Specific energy density	22	SA (T2)	Spectrum acceleration at T2
11	CAV	Cumulative absolute velocity	23	SA (1.5T1)	1.5 times SA (T1)
12	ASI	Acceleration spectrum intensity	24	SA (2T1)	2 times SA (T1)