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This paper considers the problem of shear building damage estimation subject to earthquake ground excitation using the Kalman filtering approach. The structural damage is assumed to take the form of reduced elemental stiffness. Two damage estimation algorithms are proposed: one is the multiple model approach via the optimal two-stage Kalman estimator (OTSKE), and the other is the robust two-stage Kalman filter (RTSKF), an unbiased minimum-variance filtering approach to determine the locations and extents of the damage stiffness. A numerical example of a six-storey shear plane frame structure subject to base excitation is used to illustrate the usefulness of the proposed results.

Nowadays, the civil infrastructures are subjected to disasters such as fires, floods, and earthquakes. Recently, the novel concept of Internet of Things (IoT) is known to be useful for managing crisis situations via providing a good disaster management and emergency response information. This paper addresses the civil infrastructure issue of health monitoring and disaster management by introducing IoT technology. A concept of internet of civil infrastructure (IoCI) framework is also proposed in this paper. The proposed framework is a three layered architecture. Among them, the top layer is a wireless sensor network (WSN) client which is deployed in civil infrastructure to perform specific tasks such as sensing, data processing, and acknowledgement. The middle layer is an information exchange web service (IEWS) through which all the information such as sensor data, structural health and location are exchanged, while the remaining layer is a mobile device based information platform for data representation, control, and event notification.

In this paper, the break-away and break-in (BABI) condition used in root-locus approach for two-parameter linear control systemsis derived. The condition for one-parameter control system can also be obtained from those results, which agrees with the well-known results by using sensitivity function (e.g., Kuo, 2009). Based on those conditions, an algorithm is proposed to construct the PD control gains of linear control systems for meeting designed specifications of timing response. Compared with the conventional design by using root-contours, the proposed approach can give a guideline for choosing control gains instead of those obtained by trial-and-error from the root-contours scheme. An example of the 3rd-order linear systemwith PD control is also given to demonstrate the feasibility of the proposed design.