• Title/Summary/Keyword: tension field action

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Strip Angle Changes in Accordance with the Deformation Mode of Seismic Steel Plate Shear Wall Systems (내진 강판전단벽시스템의 변형모드에 따른 스트립앵글 변화)

  • Lee, Kangmin;Li, Rui;Chen, Liuyi;Oh, Keun Yeong;Kim, Woo Seok
    • Journal of Korean Society of Steel Construction
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    • v.25 no.5
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    • pp.497-507
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    • 2013
  • This study investigated the tension-field action induced strip angle changes and deformed mode shapes of SPSW for high-rise structures subjected to lateral forces. Based on the numerical analysis 3, 9, 14 and 20 story structures, shear and flexural modes were identified by comparing the numerical analysis results to the predicted strength by theory. Shear deformation mode exhibited a constant angle in tension-field; whereas, flexural mode of the numerical results, differed from the tension-field action theory.

Analytical investigation of thin steel plate shear walls with screwed infill plate

  • Vatansever, Cuneyt;Berman, Jeffrey W.
    • Steel and Composite Structures
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    • v.19 no.5
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    • pp.1145-1165
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    • 2015
  • A behavior model for screw connections is developed to provide a better representation of the nonlinear response of thin steel plate shear walls (TSPSWs) with infill plates attached to the boundary frame members via self-drilling screws. This analytical representation is based on the load-bearing deformation relationship between the infill plate and the screw threads. The model can be easily implemented in strip models of TSPSWs where the tension field action of the infill plates is represented by a series of parallel discrete tension-only strips. Previously reported experimental results from tests of two different TSPSWs are used to provide experimental validation of the modeling approach. The beam-to-column connection behavior was also included in the analyses using a four parameter rotational spring model that was calibrated to a test of an identical frame as used for the TSPSW specimens but without the infill plates. The complete TSPSW models consisting of strips representing the infill plates, zero length elements representing the load-bearing deformation response of the screw connection at each end of the strips and the four parameter spring model at each beam-to-column connection are shown to have good agreement with the experimental results. The resulting models should enable design and analysis of TSPSWs for both new construction and retrofit of existing buildings.

Ultimate load behavior of horizontally curved composite plate girders

  • Shanmugam, N.E.;Basher, M.A.;Khalim, A.R.
    • Steel and Composite Structures
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    • v.9 no.4
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    • pp.325-348
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    • 2009
  • This paper is concerned with steel-concrete composite plate girders curved in plan. At the design stage these girders are assumed sometimes to act independent of the deck slabs resting on them in order to simplify the analysis. The advantage of composite action between the steel girders and concrete deck is not utilized. Finite element modeling of such composite action in plate girders is considered in this paper. Details of the finite element modeling and the non-linear analysis of the girders are presented along with the results obtained. Tension field action in the web panels similar to those observed in the straight plate girders is also noticed in these girders. Finite element and experimental results in respect of curved steel plate girders and straight composite plate girders tested by other researchers are presented first to assess the accuracy of the modeling. Effects of parameters such as curvature, steel flange width and web panel width that affect the behavior of composite girders are then considered in the analyses. An approximate method to predict the ultimate strength of horizontally curved composite plate girders is also presented.

Plastic Analysis of Steel Plate Shear Panels using Strip Model (스트립 모델을 이용한 강판 전단패널의 소성 해석)

  • Lee, Myung Ho;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.18 no.1
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    • pp.71-80
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    • 2006
  • The behaviors of steel-plate shear panels were investigated through an experimental and analytical study, using mild steel (S40). Steel-plate shear panels buckle at small loads, and their strength is based on the shear panel's postbuckling strength due to tension field action. In design practice, however, the capacity of steel-plate shear panels is limited to the elastic buckling strength of shear panels. Th e National Standard on Limit States Design of Steel Structures, CAN/CSA-S16.1-94 (1994) contains a guideline for the analysis of thi n, unstiffened, steel-plate shear walls using the strip model. In this paper, the structural capacity of shear panels was evaluated using the results of the experiment and of the strip model analysis.

Framed Steel Plate Wall subject to Cyclic Lateral Load (주기하중을 받는 골조강판벽의 실험연구)

  • Park, Hong Gun;Kwack, Jae Hyuk;Jeon, Sang Woo;Kim, Won Ki
    • Journal of Korean Society of Steel Construction
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    • v.16 no.6 s.73
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    • pp.781-792
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    • 2004
  • Experiments were performed to study the cyclic behavior of framed steel walls with thin web plates. Five specimens of single-bay and three-story steel plate walls were tested for cyclic lateral load. The parameters for the test specimens included the plate thickness and the column strength. Based on the test results, the strength, deformability, and energy dissipation capacity of the framed steel walls were studied. The test results showed that the behavioral characteristics of the framed steel walls with thin web plates were different in many aspects from those of the conventional braced frame, and the steel wall with a stiffened web plate exhibited cantilever action, high strength, and low ductility. With the framed steel plate walls, local plate buckling and tension-field action developed in the thin web plates, and plastic deformation was uniformly distributed along the wall's height. As a result, the framed steel plate walls exhibited combined flexural and shear deformation, but they also showed high strength and energy dissipation capacity. Moreover, such walls have high deformability, which was equivalent to that of the conventional moment frame. Frame members such as columns and beams, however, must be designed to resist the tension-field action of the thin web plates. If the column does not have sufficient strength, and if its sections are not compact enough, the overall strength of the framed steel wall might be significantly decreased by the development of the soft-story mechanism. The framed steel walls with thin web plates have advantages, such as high deformability and high strength. Therefore, they can be used as ductile elements in earthquake-resistant systems.

Sound Radiation Analysis for Structure Vibration Noise Control of Vehicle Tire under The Action of Random Moving Line Forces (불규칙 이동분포하중을 받는 차량 타이어의 구조 진동소음 제어를 위한 음향방사 해석)

  • Kim Byoung-sam
    • Proceedings of the Acoustical Society of Korea Conference
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    • autumn
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    • pp.221-224
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    • 2004
  • A theoretical model has been studied to describe the sound radiation analysis for structure vibration noise of vehicle tires under the action of random moving line forces. When a tire is analyzed, it had been modeled as curved beams with distributed springs and dash pots that represent the radial , tangential stiffness and damping of tire, respectively. The reaction due to fluid loading on the vibratory response of the curved beam is taken into account. The curved beam is assumed to occupy the plane y=0 and to be axially infinite. The curved beam material and elastic foundation are assumed to be lossless Bernoulli-Euler beam theory including a tension force, damping coefficient and stiffness of foundation will be employed. The expression for sound power is integrated numerically and the results examined as a function of Mach number, wave-number ratio and stiffness factor. The experimental investigation for structure vibration noise of vehicle tire under the action of random moving line forces has been made. Based on the Spatial Transformation of Sound Field techniques, the sound power and sound radiation are measured. Results strongly suggest that operation condition in the tire material properties and design factors of the tire govern the sound power and sound radiation characteristics.

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Wilson's Demarcation of Field: Outline for Reconsideration

  • Choi, Jeong Youl;Choi, Ho Tack
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.584-586
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    • 2009
  • Dualized program for building Public Administration scholarship in Korea has been, in a sense, a result of theoretical tension between the two positions, politics/administration dualism vs. politics/administration monism. The program has maintained its integrity by its dependence on a foundational question, "Is administration a different field of action from politics?" Korean community for the study of public administration has maintained its oneness by internally asking this question even though the two external philosophical positions were relatively indubitable. Strating from the well-known changes in the community, this brief outline for the future full exegesis tries to read carefully one point shown in the second chapter of one of the most seminal proposals for foundation of modern Public Administration, one paragrahp in the second chapter of "The Study of Administration" by Woodrow Wilson. What was the contemporary meaning of Wilson's classic distinction made in 1887? Keeping this research question in our mind, we will attempt to prepare for the full understanding of a kind of internal distinction Wilson explicitly draws between the constitutional and the administrative.

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Long-Term Treatment with Enalapril Depresses Endothelin and Neuropeptide Y-induced Vasoactive Action in Spontaneously Hypertensive Rats (선천성 고혈압흰쥐에서 Endothelin과 Neuropeptide Y에 의한 심혈관계 반응에 Enalapril 장기처치가 미치는 영향)

  • Kim, Kwon-Bae;Sohn, Uy-Dong;Kim, Choong-Young
    • The Korean Journal of Pharmacology
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    • v.28 no.1
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    • pp.49-60
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    • 1992
  • This study was designed to evaluate the responses of cardiovascular system to endothelin (ET) and neuropeptide Y (NPY) in 12 week-old SHR treated with or without enalapril (ENP) for 6 weeks. The diastolic blood pressure and heart rate were lower in ENP-treated SHR than in control. The pressor response to intravenous, but not intracerebroventricular, ET or NPY was attenuated by ENP treatment. The chronotropic action induced by electrical stimulation was attenuated by ENP or ET. The negative chronotropic action of ET was blocked by yohimbine. The increase in aortic tension induced by electrical field stimulation (EFS) was depressed in ENP-treated group as compared with non-treated group, and enhanced by ET, but not NPY, in the non-treated group. The ET-induced increase in tension was enhanced by removal of endothelium in the control group but not in ENP-treated group. The plasma concentration of norepinephrine and ET-induced increase in concentration of norepinephrine and epinephrine in plasma were decreased in ENP-treated group. These results suggest that preventive effect of enalapril on the development of hypertension may result from depressing vasoactive action of endothelin and neuropeptide Y, and sympathetic neurotransmission at peripheral nervous system.

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Design of composite plate girders under shear loading

  • Shanmugam, N.E.;Baskar, K.
    • Steel and Composite Structures
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    • v.6 no.1
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    • pp.1-14
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    • 2006
  • Experiments have been carried out on six composite and two plain steel plate girders under shear loading to understand the elastic and inelastic behaviour of such girders. The failure mechanism assumed and used to develop design equations is normally based on the failure patterns observed in the experiments. Therefore, different types of cracks and failure patterns observed in the experiments are reviewed briefly first. Based on the observed failure patterns, a design method to predict the ultimate shear capacity of composite plate girders is proposed in this paper. The values of ultimate shear capacity obtained using the proposed design method are compared with the corresponding experimental values and it is found that the proposed method is able to predict the shear capacity accurately.

Ultimate load behaviour of tapered steel plate girders

  • Shanmugam, N.E.;Min, Hu
    • Steel and Composite Structures
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    • v.7 no.6
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    • pp.469-486
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    • 2007
  • The paper is concerned with the behavior of tapered steel plate girders, primarily subjected to shear loading; experimental as well as finite element results obtained from the studies are presented in this paper. In the experimental study, 11 large-scale girders, one of uniform section and 10 tapered, were tested to failure and all girders were analysed by finite element method. The results are compared and the accuracy of the finite element modeling established. A parametric study was carried out with thickness of web, loading direction and taper angle as parameters. An analytical model, based on Cardiff model for girders of uniform cross-section, is also proposed in the paper.