Operational Modal Analysis: A Tool for Assessing Changes on Structural Health State of Historical Constructions after Consolidation and Reinforcement Works—Jura Chapel (Jerez de la Frontera, Spain)

Table 4

Comparison of modal results on the intrados and the extrados of the vault.

Mode number	Frequency before works (EFDD, Hz)			Frequency after works (EFDD, Hz)
	Extrados	Intrados	% dif.	Extrados	Intrados	% dif.
1	—	0.19	—	—	—	—
2	3.34	2.97	12.6	3.27	3.23	1.23
3	4.83	4.59	5.22	4.82	4.77	1.04
4	6.06	6.00	1.00	7.22	7.20	0.27
5	8.37	8.02	4.36	8.97	9.01	0.44
6	10.20	10.40	1.96	10.42	10.40	0.19