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Cheongwon, South Korea

Lee C.-H.,Research Institute of Structural Engineering and System | Ju Y.K.,Korea University | Min J.-K.,Built Environment Materials Center | Lho S.-H.,Structural Engineering Research Institute | Kim S.-D.,Korea University
Engineering Structures | Year: 2015

This paper describes the cyclic performance of non-uniform steel strip dampers. The shapes proposed are (a) a dumbbell-shaped strip, (b) a tapered strip, and (c) an hourglass-shaped strip. Each of these strip shapes was designed to reduce stress concentration when subjected to cyclic loadings. In order to evaluate the performance of the dampers, six specimens were tested cyclically. Cumulative damage caused by hysteretic motion was effectively distributed throughout the entire height of the strips, and SEM microstructures of the fracture surfaces represented a typical ductile failure mode. The experimental results showed that the proposed strip dampers indicate excellent seismic performance compared to conventional prismatic slit dampers. Furthermore, it was verified that structural performance can be accurately estimated using the design equations presented in the paper. © 2015 Elsevier Ltd. Source


Kim H.,Kyung Hee University | Park J.W.,UNISON eTech Co. | Park J.Y.,Built Environment Materials Center | Lee Y.H.,Kyung Hee University | Kim D.-J.,Kyung Hee University
Indian Journal of Engineering and Materials Sciences | Year: 2015

This study proposes a steel grid shear wall that can provide a sufficient lateral resistance and can be used as a seismic retrofit solution for existing buildings. An experiment is performed on reinforced concrete (RC) frames with and without the steel grid shear wall. These frame specimens are subjected to combined axial and cyclic lateral loads that are applied by using three actuators. The experimental results show that the RC frame specimen with the proposed shear wall can retain higher lateral strength and ductility than the one without the steel grid wall. © 2015 National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved. Source


Kim H.,Kyung Hee University | Lee Y.H.,Kyung Hee University | Park H.,Kyung Hee University | Kim D.-J.,Kyung Hee University | And 2 more authors.
Journal of Vibroengineering | Year: 2015

In this paper, we investigate the performance of a new lead rubber damper (LRD) and its applicability to a full-scale structure. This device is more advanced than existing lead-rubber based isolation devices. In contrast to the existing devices, multiple lead cores are installed in the LRD in order to enhance the performance of the laminated rubber and lead. It is able to perform effectively under the application of shear force. An experiment was performed to investigate its dependency on the level of shear strain and frequency. The applicability of this new device to a full-scale structure is also examined by performing a vibration test on a five floor modal-test tower. © 2015, JVE INTERNATIONAL LTD. Source


Park H.I.,Built Environment Materials Center | Hong S.R.,Built Environment Materials Center | Kang C.,Korea Infrastructure Safety and Technology Corporation | Kim J.M.,Kongju National University
Asian Journal of Chemistry | Year: 2014

A general method to expand the urban green space is to utilize the artificial ground that is unutilized in cities, such as buildings and rooftops. This artificial ground mainly utilizes light-weight artificial soil that in addition to being light-weight has economic feasibility and functionality. The processing technology of bottom ash in thermal power stations shows a tendency to change from the wet process to the dry process. The dry process bottom ash, which arises from the new process, are expected to be utilized as light-weight artificial soil, because they are poor in water, salt and unburned carbon, which are not the characteristics of the existing wet process bottom ash and have a lower density than general aggregate. Therefore, in this study, the suitability of artificial soil composed of dry process bottom ash was evaluated by comparing it to perlite, which is presently predominantly used as artificial soil. This study shows that the coefficient of permeability, saturation bulk density, pH, EC, total amount of nitrogen and organic matter contents of dry process bottom ash are similar to those of perlite. It is concluded that the dry process bottom ash can be utilized as artificial soil. Source

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