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Shin, Myoungsu,LaFave, James M. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.18 No.5
In seismic analysis of moment-resisting frames, beam-column connections are often modeled with rigid joint zones. However, it has been demonstrated that, in ductile reinforced concrete (RC) moment-resisting frames designed based on current codes (to say nothing of older non-ductile frames), the joint zones are in fact not rigid, but rather undergo significant shear deformations that contribute greatly to global drift. Therefore, the "rigid joint" assumption may result in misinterpretation of the global performance characteristics of frames and could consequently lead to miscalculation of strength and ductility demands on constituent frame members. The primary objective of this paper is to propose a rational method for estimating the hysteretic joint shear behavior of RC connections and for incorporating this behavior into frame analysis. The authors tested four RC edge beam-column-slab connection subassemblies subjected to earthquake-type lateral loading; hysteretic joint shear behavior is investigated based on these tests and other laboratory tests reported in the literature. An analytical scheme employing the modified compression field theory (MCFT) is developed to approximate joint shear stress vs. joint shear strain response. A connection model capable of explicitly considering hysteretic joint shear behavior is then formulated for nonlinear structural analysis. In the model, a joint is represented by rigid elements located along the joint edges and nonlinear rotational springs embedded in one of the four hinges linking adjacent rigid elements. The connection model is able to well represent the experimental hysteretic joint shear behavior and overall load-displacement response of connection subassemblies.
Towards optimal design of high‐rise building tube systems
Shin, Myoungsu,Kang, Thomas H.‐,K.,Pimentel, Benjamin John Wiley Sons, Ltd. 2012 The structural design of tall and special building Vol.21 No.6
<P><B>Abstract</B></P><P>The primary objectives of this study are to investigate effects of varying design parameters on the tube action and shear lag behaviour of a typical reinforced concrete frame‐wall tube building, and propose optimal design approaches for similar tube structures. A parametric study was conducted with selected key design variables on the performance of a 55‐storey hotel building planned in New York City. The lateral force resistance of the case study building is primarily exerted by exterior shear walls in one direction and by exterior moment frames in the other direction, enhanced by the tube action credited to the connection of the walls and the frames. The design variables considered for the parametric study include the column depth, beam depth, column width and beam width of the moment frames. The performance of each model was assessed in terms of overall and critical (maximum) storey drifts, force distributions between various lateral force‐resisting members and shear lag behaviour. Overall, the effects of the column depth (column dimension parallel to the frame direction) on the tube action and shear lag behaviour were more prominent than the other member dimensions. Copyright © 2010 John Wiley & Sons, Ltd.</P>
신명수 ( Shin Myoungsu ),안은종 ( Ahn Eunjong ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
최근 비파괴 시험 기법에서 일반적으로 활용되고 있는 50 kHz 내외의 Coherent wave 성분을 활용한 분석 기법이 아닌 150 kHz 이상의 고주파를 가진하여 Incoherent wave 성분 기반의 초음파 기법(확산초음파, 코다파 간섭 기법 등)을 통하여 콘크리트 재료 성능 평가 및 특성화 연구가 활발히 진행되고 있다. 비균질성 재료인 콘크리트 내부에서 회절, 산란, 반사 등을 일으키는 Incoherent wave 성분을 활용한 기법은 파장과 비슷하거나 작은 크기인 mm 규모의 미세균열 손상 평가에 강점을 갖고 있지만, mm 크기의 공극을 채우고 있는 수분 함유량에도 민감하게 변화하게 있는 실정이다. 따라서, 본 연구에서는 완전 포화된 콘크리트를 건조 시키면서 콘크리트 내부의 수분 함유량과 확산초음파 파라미터의 변화를 비교분석하고자 한다.
이명수(Myoungsu Lee),김기성(Kisung Kim),신만재(Manjae Shin) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Small domestic injection manufacturers are struggling due to the quality management techniques, lack of expertise and lack of competitiveness of the aging facilities. It is also a lack of integrated management of raw materials, process, tooling and equipment. And the action after the failure and equipment failure occurred. Decreased utilization, fixed costs per unit increased, leading to a vicious cycle is repeated loss of cost competitiveness. So, we implemented a quality management system following the same intelligent. 1) Real-time Data collection technique considering a variety and compatibility of injection molding machine 2) DB knowledge management technology to improve the accuracy of the work 3) Fool-Proof Technology for prevent operator error 4) systematic maintenance management techniques for improve equipment efficiency 5) advanced quality management techniques using statistical process control techniques 6) failure prediction technology using intelligent algorithms
Gwon, Seongwoo,Shin, Myoungsu Elsevier 2019 Construction and Building Materials Vol.228 No.-
<P><B>Abstract</B></P> <P>This study investigates the effects of micro-filler characteristics and mixing temperature on the rheological properties of fresh modified sulfur polymer composites. Modified sulfur was used as the binder, and a blend of Portland cement and fly ash was used as the micro-filler in the sulfur composites. Different micro-filler volumetric ratios were used (15, 25, and 35%), and the composition ratios of Portland cement to fly ash used were 1:0, 3:1, 1:1, 1:3, and 0:1. Two temperatures, 120 and 140 °C, were selected considering that the temperatures of sulfur composites usually range from 120 to 140 °C at casting. Moreover, the correlation between mini slump flow and yield stress was examined. In addition, the compressive strengths of various hardened sulfur composites were compared with respect to the effect of micro-filler. An increase in the micro-filler volumetric ratio generally caused an exponential growth of both yield stress and plastic viscosity. The rheological properties generally increased as the cement-to-fly ash ratio increased, and this effect was distinct with 35% micro-filler. The increase in the mixing temperature from 120 to 140 °C caused a considerable increase in both yield stress and plastic viscosity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The rheological properties of fresh modified sulfur polymer composites were investigated. </LI> <LI> A blend of Portland cement and fly ash was used as the micro-filler in the sulfur composites. </LI> <LI> The increase of micro-filler volume ratio caused an exponential growth of yield stress and plastic viscosity. </LI> <LI> The rheological properties generally increased as the cement-to-fly ash ratio increased. </LI> <LI> The change of mixing temperature had a significant effect on the rheological properties. </LI> </UL> </P>
Nonlinear modeling parameters of RC coupling beams in a coupled wall system
Gwon, Seongwoo,Shin, Myoungsu,Pimentel, Benjamin,Lee, Deokjung 테크노프레스 2014 Earthquakes and structures Vol.7 No.5
ASCE/SEI 41-13 provides modeling parameters and numerical acceptance criteria for various types of members that are useful for evaluating the seismic performance of reinforced concrete (RC) building structures. To accurately evaluate the global performance of a coupled wall system, it is crucial to first properly define the component behaviors (i.e., force-displacement relationships of shear walls and coupling beams). However, only a few studies have investigated on the modeling of RC coupling beams subjected to earthquake loading to date. The main objective of this study is to assess the reliability of ASCE 41-13 modeling parameters specified for RC coupling beams with various design details, based on a database compiling almost all coupling beam tests available worldwide. Several recently developed coupling beam models are also reviewed. Finally, a rational method is proposed for determining the chord yield rotation of RC coupling beams.