Earthquake Engineering Research - HKU Libraries - The University ...

592
2.3 Sampling rate
Structural monitoring requires a relatively high sampling rate. A minimum of 100 sps (samples per
second) per channel is required. Again, the last two systems (See Table 1.1) provide up to 500 sps per
channel
2.4 Data broadcasting
For real-time monitoring, the data needs to be broadcasted to multiple remote stations. Each station
should have software capable of recording, analyzing, and comparing data with different userspecified
design limits and take different actions based on exceedance criteria.
3. ENGINEERING NEEDS
From engineers point of view the structural monitoring has different aspects. This is because different
specialties are interested in:
• Overall structural response
• Structural elements behavior
• Structural elements fatigue (long term monitoring combined with statistical analysis)
• Soil-structure interaction
This information is provided by different type of sensors. The system must be able to accept signals
from all sensors, group them on categories, distribute remotely the signals to each user based on the
field of interest, and provide the specific analysis tools for each user. All these functions are to be
handled by the Central recording system (called server) and distributed in real-time to remote stations
(called clients).
Again, the last two systems (See Table 1.1) cover all these requirements.
4. TURN-KEY SYSTEM
Digitexx Data Systems, Inc. developed two systems (one with 16-bit and the second with 24-bit
resolution) capable of performing ail functions described above. The system has been developed to
use COTS components. Digitexx developed the software package following the concept presented in
Figure 4.1.