## 3 Results
### Blake-Table Data
The relative TAC, computed with respect to the pre-earthquake WN) and shown in the first row of Figure 16, has the highest increase for tests #7 and #9, after which significantly increased structural damage states have been noted (see Table 3). The TAC value does not increase between tests #7 and #8, indicating that the aftershock did not further damage the structure. The capacity of data-driven indicators to accelerate post-earthquake assessment by identifying buildings that do not sustain additional damage could be a major contributor to accelerated post-earthquake recovery. In addition, the _TAC_, when calculated in an absolute manner, provides a clear separation between non-damaging earthquakes (#1 and #2) and damaging earthquakes as well as between slight and extensive damage. This is a necessary starting point for successful building tagging based on a traffic-light logic. In addition, when compared to visually observed DGs (EMS98 damage scale), the TAC provides a more refined information about damage damage, which could be of interest for subsequent re-pair design. While a popular feature and producing good results with the simulated case study, the change in natural frequency (\(\Delta f_{1}\), shown in the second row of Figure 16) is sensitive to damage but does not scale well with the observed severity of damage, as the relative decrease in this DSF is higher for the minor damage sustained in the first four tests than for the major structural damage sustained in tests #6 and #8. Given no WN tests have been conducted following the aftershock, this DSF cannot be evaluated for test #7. The stiffness proxy, \(KPRX\), is reported in the third row of Figure 16) and when calculated with respect to the pre-earthquake WN contains useful information to separate small damage (\(DG1\)) from more severe damage (\(DG\geq 2\)). However, the \(KPRX\) does not scale well with the nonlinearity indicators and is not able to track the absolute damage with respect to the initial \"healthy\" building state, as the frequency range (\(m\) in Equation (11)) is not updated and thus, the \(KPRX\) becomes noisy. The change in the phase-angle of the cross power-spectral density, \(PAAC\) (see fourth row of Figure 16), derived from post-earthquake WN excitation, is very sensitive to damage, yet it does not scale well with the two nonlinearity indicators (hysteretic work and peak roof drift ratio). While the relative formulation of this DSF is a good source to detect the appearance of new cracks and significant damage, it fails to detect the growth of cracks, such as those caused by earthquakes #4 and #5). Figure 16: Comparison of acceleration-based DSFs with the hysteretic work (**left**) and peak transient roof drift (**right**) observed on the shake-table tests performed by [PERSON] et al. (2018). DSFs are represented for two changing reference conditions: healthy state and pre-earthquake state. In a similar manner, the time-domain correlation of wavelet coefficients (\(WLC\)) provides a good separation between minor damage and significant structural damage (from test #6). In addition, the increment in damage after the sixth test was dominated by the peak roof drift ratio, while in the previous tests, the hysteretic work dominated the \(PAindex\), as shown in Figure A2. The application of DSFs on the shake-table data confirms the observation that they provide complementary information and thus, a combination of several DSFs would be optimal. For instance, the \(TAC\) contains information about the overall damage state, while \(PAAC\) provides useful information about increasing the extent of damage (appearance of new cracks). Furthermore, \(WLC\) shows a good separation between minor damage and severe nonlinearity due to displacement beyond the elastic, mostly linear, range. Given the observation that DSFs may track the absolute and the incremental damage sustained by structures, the \(TAC\) and the \(WLC\), which can be both calculated for shorter time windows (see Table 1), are evaluated in greater detail.