10 Ambient Vibration Testing of Two Highly Irregular Tall Buildings in Shanghai 91 the comprehensive layout of all setups. The acquisition length of each setup is 1 h with a sampling rate of 512 Hz, and all sensors are leveled and photographically recorded before every measurement. It should be noticed that due to the limitation of memory of each partition, only 51 min length of data were recorded by using sampling rate of 512 Hz. 10.3.3 AV Testing of SIDC AV Testing of SIDC was carried out on Thursday, May 7th, 2015. Due to the security control, the testing personnel were only allowed to access the elevator and the surrounding areas. Therefore, for both the main and the secondary towers, sensors were placed at same locations of each tested floor around the elevator corridor. Before the main setups, two pre-setups were carried out to synchronize the internal clock as previous experiment. In total eight sensors were utilized in all three setups of the test. Considering the unique structural system, sensor No.1 and No. 9 were selected as reference sensors and placed at the top floor of both main and secondary buildings, its location will remain unchanged throughout the entire test. During each setup, all sensors were placed parallel to the stair well core wall next to the corner and face to the north side of the building. Fig. 10.6 shows the comprehensive layout of all setups. A more detailed illustration can be found in Fig. 10.7 from top view of the building. For the main tower, the sensors were strictly put around the right elevator corridor, while for the secondary tower, a larger area was captured. Two sensors were placed on the top floor of the two towers as reference points and kept recording for the duration of test. Reference sensor of the main tower was placed on 24th floor at the location highlighted in Fig. 10.8 left. For secondary tower, reference sensor was placed in the stairwell between 11th and 12th floor, as shown in Fig. 10.8 right. A total of 6 setups were tested on the testing day, with 3 setups for main tower, 2 setups for secondary tower and 1 setup for basement. The test last from 11:37 pm to 17:34 pm, with acquisition length of 30 min for each setup and a sampling rate of 512 Hz. Table 10.2 summarizes the start and stop time as well as tested floors for each setup. Fig. 10.6 Setup plan from south elevation view and top view of two towers
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