Temperature Effect on Mechanical Properties and Damage Identification of Concrete Structure

Table 6

The first order natural frequencies under coupling effect of temperature and damage (Hz).

Damage severity (%)	Temperature (°C)
	−20	0	20	40	60
0	201.655	192.380	189.935	184.280	178.220
10	195.800	188.925	180.170	176.265	172.360
20	183.185	177.245	174.800	172.850	166.985
30	177.240	173.335	169.915	164.050	158.685
40	173.335	169.355	165.075	160.905	156.000