Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure

Table 1

Test data of baseplate from Gomez [17] tests and evaluation of for different types of soil based on Melchers [16].

BP thickness; (mm)	/	(EI/H)	Type of soil	(EI/H)	(EI/H)
25.4	0	1.24	Soft clay	0	0
			Loose sand	0	0
			Dense sand and gravel	0	0
			Basalt	0	0
	0.16	3.49	Soft clay	0.14	0.14
			Loose sand	1.82	1.20
			Dense sand and gravel	8.55	2.48
			Basalt	3590	3.49
	0.27	5.81	Soft clay	0.15	0.15
			Loose sand	1.95	1.46
			Dense sand and gravel	9.19	3.56
			Basalt	3863	5.80
38.1	0.16	3.07	Soft clay	0.12	0.12
			Loose sand	1.57	1.04
			Dense sand and gravel	7.33	2.17
			Basalt	3097	3.07
50.8	0.16	3.02	Soft clay	0.12	0.12
			Loose sand	1.54	1.02
			Dense sand and gravel	7.25	2.13
			Basalt	3046	3.01

The test’s column section was W200 7, Grade 300.
For tests that were conducted several times, the median results are presented in the table.
The footing is assumed to be rigid relative to the soil that it rests on, with dimension of 1.2 m 1.2 m.
is the nominal column section capacity and is the applied axial force to the column.