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Ryan McDaniel,Shishuang Sun,Genda Chen,David Pommerenke,James Drewniak 국제구조공학회 2005 Smart Structures and Systems, An International Jou Vol.1 No.2
A new design of distributed crack sensors based on the topological change of transmission line cables is presented for the condition assessment of reinforced concrete (RC) structures during and immediately after an earthquake event. This study is primarily focused on the performance of cable sensors under dynamic loading, particularly a feature that allows for some memory of the crack history of an RC member. This feature enables the post-earthquake condition assessment of structural members such as RC columns, in which the earthquake-induced cracks are closed immediately after an earthquake event due to gravity loads, and are visually undetectable. Factors affecting the onset of the feature were investigated experimentally with small-scale RC beams under cyclic loading. Test results indicated that both crack width and the number of loading cycles were instrumental in the onset of the memory feature of cable sensors. Practical issues related to dynamic acquisition with the sensors are discussed. The sensors were proven to be fatigue resistant from shake table tests of RC columns. The sensors continued to show useful performance after the columns can no longer support additional loads.
Chen, Genda,McDaniel, Ryan,Sun, Shishuang,Pommerenke, David,Drewniak, James Techno-Press 2005 Smart Structures and Systems, An International Jou Vol.1 No.2
A new design of distributed crack sensors based on the topological change of transmission line cables is presented for the condition assessment of reinforced concrete (RC) structures during and immediately after an earthquake event. This study is primarily focused on the performance of cable sensors under dynamic loading, particularly a feature that allows for some "memory" of the crack history of an RC member. This feature enables the post-earthquake condition assessment of structural members such as RC columns, in which the earthquake-induced cracks are closed immediately after an earthquake event due to gravity loads, and are visually undetectable. Factors affecting the onset of the feature were investigated experimentally with small-scale RC beams under cyclic loading. Test results indicated that both crack width and the number of loading cycles were instrumental in the onset of the memory feature of cable sensors. Practical issues related to dynamic acquisition with the sensors are discussed. The sensors were proven to be fatigue resistant from shake table tests of RC columns. The sensors continued to show useful performance after the columns can no longer support additional loads.
Jingook Kim,Jun Fan,Ruehli, A. E.,Joungho Kim,Drewniak, J. L. IEEE 2011 IEEE transactions on microwave theory and techniqu Vol.59 No.8
<P>Partial inductances are computed herein for the via transitions between parallel planes. A hybrid method proposed for the inductance calculation correlates the definition of the partial inductance and a resonant cavity model. The hybrid method is corroborated by comparison with the partial-element equivalent-circuit and the cavity methods, as well as measurements. The portions of the plane net and via net inductances are quantified, and the contribution of each plane current to the plane net inductance is quantitatively analyzed.</P>
Equivalent Circuit Model for Power Bus Design in Multi-Layer PCBs With Via Arrays
Jingook Kim,Shringarpure, K,Jun Fan,Joungho Kim,Drewniak, J L IEEE 2011 IEEE microwave and wireless components letters Vol.21 No.2
<P>An equivalent circuit model for multilayer power planes with multiple via arrays is proposed. The complexity of the actual geometry is greatly reduced in the circuit model with the accuracy maintained. The model is corroborated by measurements.</P>