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현장타설 끼움벽체로 보강된 비내진 상세를 갖는 철근콘크리트 골조의 비선형 해석
박우철(Park Woo-Cheol),박완신(Park Wan-Shin),한병찬(Han Byung-Chan),윤현도(Yun Hyun-Do),정수영(Chung Soo-Young) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2
Hysteresis failure models for inelastic behavior of macro-models of infilled lightly reinforced concrete frames have been developed. This models are empirical expressions relating three hysteresis parameters which are the simulating deteriorating behavior of strength (β), stiffness (α), and bond slip (γ) to materials and geometric properties of LRC frames. The incorporation of the hysteresis failure models into computer program IDARC-2D is described. Estimate the values for three parameters α, β and γ which best fit the benchmark hysteresis loops. The system identification procedure performs a trial and error search for a set of initial values of α, β and γ such that the cumulative error between the predicted and experimentally observed hysteretic energy is minimized. Multi-variable regressions were performed to relate α, β, γ as functions of the specimen's material and geometric properties and reinforcement parameters. The empirical expressions resulting from these regression analyses are the hysteresis failure models. This models were validated against benchmark results and used in a parametric study to evaluate the influence of certain variables to the behavior of reinforced concrete frame with infill crp wall.
끼움벽체로 보강된 비내진 상세를 갖는 철근콘크리트 골조의 비선형 해석
박우철 ( Park¸ Woo-cheol ),박완신 ( Park¸ Yoan-sin ),한병찬 ( Han¸ Byung-chan ),윤현도 ( Yun¸ Hyun-do ),정수영 ( Chung¸ Soo-young ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.1
Hysteresis failure models for inelastic behavior of macro-models of infilled lightly reinforced concrete frames have been developed. This models are empirical expressions relating three hysteresis parameters which are the simulating deteriorating behavior of strength ( β ), stiffness ( α ),and bond slip (γ) to materials and geometric properties of RC frames. The incorporation of the hysteresis failure models into computer program IDARC-2D is described. Estimate the values for three parameters α, β,and γ which best fit the benchmark hysteresis loops(Aoyama 1984). The system identification procedure performs a trial and error search for a set of initial values of α, β, and γ such that the cumulative error between the predicted and experimentally observed hysteretic energy is minimized. This models were validated against benchmark results and used in a parametric study to evaluate the influence of certain variables to the behavior of infilled lightly reinforced concrete frames.
Euler-Lagrange Coupling 기법을 이용한 Tire-Mud 연성해석
박우철(Woo Cheol Park),김기운(Kee-Woon Kim),우종식(Jong Sik Woo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Vehicles, such as an agricultural tractor, construction vehicle, mobile machinery, and 4-wheel drive vehicle, are often operated on the mud terrain. In many cases, the mud terrain is deformable; therefore, the deformation should be taken into consideration in order to assess the off-the-road performance of a tire. Recent progress in computational mechanics enabled us to simulate the large scale coupling problem, in which the deformation of tire structure and of surrounding medium can be interactively considered. Using CEL(Coupling Eulerian and Lagrangian) technology, hydroplaning phenomena and tire traction on snow have been predicted. In this study, the simulation methodology of Euler and Lagrangian coupling problems is developed for pneumatic tires of arbitrary tread patterns. The Finite Element Method (FEM) and the Finite Volume Method (FVM) are used for structural and for soil-tire interaction analysis, respectively. The soil is modeled as an elastoplastic material with a specified yield criterion and a nonlinear elasticity. The material constants are referred to measurement data using the TST paper. Finally, the traction evaluation of the tire in mud field is predicted, and has a good result.
현장타설 끼움벽체로 보강된 철근콘크리트 골조의 비선형 이력거동에 관한 해석적 연구
이지훈 ( Lee Jee-hoon ),장기영 ( Jang Gi-young ),박우철 ( Park Woo-cheol ),윤현도 ( Yun Hyun-do ),정수영 ( Chung Soo-young ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
To develope an analytical tool for assessing seismic performance of lightly reinforced concrete frame strengthened with CIP infill wall, hysteresis failure models were developed and incorporated into computer program IDARC for dynamic analysis of LRC frame. These models are empirical expressions relating three hysteresis parameters which are the simulating deterioration behavior of stiffness(α), strength(β), pinching( γ ) to materials and geometric properties of reinforced concrete frame. The empirical expressions resulting from these regression analysis are the hysteresis failure models. Empirical expressions were developed for estimations of ultimate lateral shear strength, story drift ratio, ductility factor of existing reinforced concrete frame. The expression provide "benchmark" values for quick estimations of seismic capacity of reinforce concrete framstrengthened with CIP infill wall.