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<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; "><i><span style="font-family: 'Times New Roman'; ">Name:
Qingzhao Kong <o:p></o:p></span></i></p>
<p class="MsoNormal" style="font-size: 14px; "><i><span style="font-family: 'Times New Roman'; ">Time: Jan 27/2015
8:30AM - 10:30AM<br>
Location: Large conference room</span></i><o:p></o:p></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; "><b>Chair of the Committee</b>: </p><p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; ">Dr. Gangbing
Song, Professor <span style="font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; "><b><br></b></p><p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; "><b>Committee Members: </b></p><p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; ">Dr.<b>
</b>Matthew Franchek, Professor </p><p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; line-height: normal; ">Dr. Li Sun, Associate
Professor <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; "><span style="font-family: Calibri, sans-serif; ">Dr.
Yi-Lung Mo, Professor </span><span style="font-size: 14px; font-family: Calibri, sans-serif; "> </span></p><p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; ">Dr. Mo Li, Assistant
Professor <b><o:p></o:p></b></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; margin-left: 112.5pt; "><o:p> </o:p></p>
<p class="MsoNormal" align="center" style="font-size: 14px; text-align: center; "><b><span style="font-family: 'Times New Roman'; ">Abstract<o:p></o:p></span></b></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Recent structural failures in both
developing and developed countries highlight the importance of structural health
monitoring, which has the ability to provide early warning based on real time
monitoring of the structure of interest. The versatile functions and low cost
of piezoceramic material has demonstrated its capability as transducers in
structural health monitoring. This dissertation investigated modeling and
innovative applications using piezoceramic based smart aggregate transducers
for health monitoring of various structures.<o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">A theoretical and experimental modeling
study of piezoceramic based smart aggregates were firstly conducted.
Fundamental equations of a smart aggregate were established and numerical
simulations were performed. The resonance and anti-resonance frequencies of a
smart aggregate sample were computed, and were later verified by experimental
tests. <o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Many structural failures were initiated
by cracks. A chapter of this dissertation is devoted to crack detection using
piezoceramic based transducers. Two types of structures, a pipeline and a
concrete column, were investigated. For the pipeline structure, an active
sensing system with distributed actuators and sensors detects the crack and
monitor the crack development. For the concrete column, the cyclic crack
open-close condition was determined by embedded smart aggregates using wavelet
packet-based structural damage index. <o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Steel plate reinforced concrete
structures are increasingly used in civil engineering. However, the bonding
between the steel plate and the concrete is not well studied nor well known.
This dissertation investigates detection of bond slip between the steel plate
and concrete using smart aggregates. With appropriate deployment of smart
aggregates in concrete structure and steel plate surface, shear stress induced
bond slip phenomenon was monitored in real time. The severity of debonding was
also characterized using the proposed method.<o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Concrete structures are often used as
underground containment for nuclear materials. Cracks and underground water are
a lethal combination to migrate the radioactive pollution. This dissertation proposed an effective
active sensing based method to detect concrete cracks and to further detect
water presence in these concrete cracks, as experimentally demonstrated. <o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Concrete is the most popular structural
material and understanding its very early age (0-20 hours) hydration
performance is of great importance. This dissertation proposes a novel approach
to this topic using smart aggregate based active sensing approach. Both time
domain and frequency domain analyses were conducted and the proposed approach
can clearly identify the three distinct states, the liquid state, the
transition state, and the hardened state, during the concrete hydration
process.<o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; margin-bottom: 0.0001pt; text-align: justify; text-indent: 0.5in; line-height: normal; "><span style="font-family: 'Times New Roman'; ">Soil freeze-thaw condition plays an
important role in structural soil interaction in cold regions. The last chapter
of this dissertation presents an innovative active sensing based method to
monitor soil freeze-thaw condition using embedded smart aggregates. Since wave
propagation is highly sensitive to the mechanical properties of soil during the
freezing and thawing process, the received stress wave can be an effective
indicator to determine the soil status. A wavelet packet-based soil frozen
index was proposed and successfully applied to monitor the soil freezing or
thawing status.<o:p></o:p></span></p>
<p class="MsoNormal" style="font-size: 14px; "><o:p> </o:p></p>
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