• Title, Summary, Keyword: deformation compatibility

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Shear Behavioral Model based on Shear Deformation Compatibility in Reinforced Concrete Members (전단변형적합조건에 기반한 철근콘크리트 부재의 전단 해석 모델)

  • Kim, Woo;Rhee, Chang-Shin;Jeong, Jae-Pyong
    • Journal of the Korea Concrete Institute
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    • v.18 no.3
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    • pp.379-388
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    • 2006
  • This paper presents a model for evaluating the contribution by arch action to shear resistance in shear-critical reinforced concrete beams. Based on the relationship between shear and bending moment in beams subjected to combined shear and bending, the behavior of a beam is explicitly divided into two base components of the flexural action and the tied arch action. The compatibility condition of the shear deformation that deviates from Bernoulli bending plane is formulated utilizing the smeared truss idealization with an inclined compression chord. The Modified Compression Filed Theory is employed to calculate the shear deformation of the web, and the relative axial displacements of the compression and the tension chord by the shear flow are also calculated. From this shear compatibility condition in a beam, the shear contribution by the arch action is numerically decoupled. Then the validity of the model is examined by applying the model to some selected test beams in literatures. The results may confirm the rationale of the proposed behavioral model.

EXPERIMENTAL EVALUATION OF USED CARS FOR FRONTAL COLLISION COMPATIBILITY

  • Lim, J.H.;Park, I.S.;Heo, S.J.
    • International Journal of Automotive Technology
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    • v.7 no.6
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    • pp.715-720
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    • 2006
  • This research investigates injury values and vehicle deformation for vehicle frontal crash compatibility. To investigate compatibility in an individual case, it is possible to impact two vehicles and evaluate the injury values and deformations in both vehicles. In this study, four tests were conducted to evaluate compatibility. A large and mini vehicle were subjected to a frontal car-to-car crash test at a speed of 48.3 km/h with an offset of 40%. An inclination car-to-car crash test using the large and small vehicle were conducted at 30 km/h at a $30^{\circ}$ angle. The results of the 48.3 km/h, car-to-car frontal crash revealed extremely high injury values on the chest and upper leg of the Hybrid III 50% driver dummy with seatbelt in the mini vehicle compared to the large vehicle. For the 30 km/h, car-to-car inclination crash, however, injury values in the small vehicle were 1.5 times higher compared to the large vehicle.

A Study on the Service Load State Behavior of Reinforced Concrete Plate Member

  • Bhang, Jee-Hwan;Kang, Won-Ho
    • KCI Concrete Journal
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    • v.12 no.2
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    • pp.55-72
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    • 2000
  • This paper proposes a mechanical model to describe the load-deformation responses of the reinforced concrete plate members under service load state. An Analytical method is introduced on the basis of the rotating crack model which considers equilibrium, compatibility conditions, load-strain relationship of cracked member, and constitutive law for materials. The tension stiffening effect in reinforced concrete structures is taken into account by the average tensile stress-strain relationship from the load-strain relationship for the cracked member and the constitutive law for material. The strain compatibility is used to find out the crack direction because the crack direction is an unknown variable in the equilibrium and compatibility conditions. The proposed theory is verified by the numerous experimental data such as the crack direction, moment-steel strain relationship, moment-crack width relationship. The present paper can provide some basis for the provision of the definition of serviceability for plate structures of which reinforcements are deviated from the principal stresses, because the present code defines the serviceability by the deflection, crack control, vibration and fatigue basically for the skeletal members. The proposed theory is applicable to predict the service load state behavior of a variety of reinforced concrete plate structures such as skew slab bridges, the deck of skew girder bridges.

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Unified theory of reinforced concrete-A summary

  • Hsu, Thomas T.C.
    • Structural Engineering and Mechanics
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    • v.2 no.1
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    • pp.1-16
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    • 1994
  • A unified theory has recently been developed for reinforced concrete structures (Hsu 1993), subjected to the four basic actions - bending, axial load, shear and torsion. The theory has five components, namely, the struts-and-ties model, the equilibrium (or plasticity) truss model, the Bernoulli compatibility truss model, the Mohr compatibility truss model and the softened truss model. Because the last three models can satisfy the stress equilibrium, the strain compatibility and the constitutive laws of materials, they can predict not only the strength, but also the load-deformation history of a member. In this paper the five models are summarized to illustrate their intrinsic consistency.

Blank Design and Strain Prediction in Sheete Metal Forming Process (박판금속 성형공정에서의 블랭크 설계및 변형률 예측)

  • Lee, Choong-Ho;Huh, Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.6
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    • pp.1810-1818
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    • 1996
  • A new finite elemetn approach is introduced for direct prediction of bland shapes and strain distributions from desired final shapes in sheet metal forming. The approach deals with the geometric compatibility of finite elements, plastic deformation theory, minimization of plastic work with constraints, and a proper initial guess. The algorithm developed is applied to cylindrical cup drawing, square cup drawing, and fron fender forming to confirm its validity by demonstratin reasonable accurate numerical results of each problems. Rapid calculation with this algorithm enables easy determination of various process variables for design of sheet metal forming process.

Evaluation of Long-Term Performance of Geostrip Reinforcements Considering Deformation Behaviors (변형거동을 고려한 지오스트립 보강재의 장기성능 평가)

  • Jeon, Han-Yong;Chung, Youn-In
    • Textile Science and Engineering
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    • v.43 no.4
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    • pp.159-165
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    • 2006
  • Strain compatibility was applied to examine the limit of long-term allowable strength determination for geostrip as geosynthetic reinforcement. Creep test was performed for geostrip reinforcements according to SIM(step isothermal method) to obtain isochronous curve. Through the isochronous curve of geostrip reinforcements, the long-term allowable tensile properties of geostrip reinforcements was interpreted and analyzed.

A Study on Co-Injection Resin Transfer Molding

  • Gonzalez, Alfredo;Lee, Doh-Hoon;Lee, Woo-Il;Um, Moon-Kwang;Byun, Joon-Hyung;Kim, Young-Min;Chung, Seung-Hwang;Lee, Byoung-Ho
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.111-116
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    • 2005
  • In this study the compatibility of Epoxy resin with Phenolic using three different separation layer techniques was investigated; some important process variables such as pressure, flow front and deformation were monitored in order to get a better understanding of the process.

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Shear Deformation Characteristics of Concrete Beams Strengthened with Steel/FRP Bar (철근 및 FRP Bar 콘크리트보의 전단변형 특성)

  • Shin, Geun-Ok;Rhee, Chang-Shin;Kim, Dae-Joong;Kim, Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.277-280
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    • 2006
  • This paper deals with the shear deformation charateristics of concrete beams strengthened with steel/FRP Bar. Applying the shear behavioral model based on shear deformation compatibility to RC beams tested by Ahmed K. El-Sayed et al.(2006), their transverse deformation in the web are calculated at ultimated loads after decoupling the shear carried by arch action in each beams. The calculated transverse deformation at ultimated loads are nearly same for the different reinforcement ratio. From these results, the temporary transverse deformation limit criterion is deduced. Using the proposed temporary limit criterion, the shear strength of concrete beams strengthen with FRP Bar tested by Ahmed K. El-Sayed et al.(2006) is predicted. These predicted values are compared with the measured values and the results are also compared with the current ACI and JSCE equation. The proposed method predicts the ultimate shear capacities more accurately than the equation of ACI and JSCE code. The predictions by the ACI and JSCE code are founded to be very conservative.

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A Study on Shear Deformation Characteristics of RC Beams (RC보의 전단변형 특성에 관한 연구)

  • Kim, Min-Joong;Jeong, Kil-Sang;Kim, Dae-Joong;Kim, Woo
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.273-276
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    • 2006
  • This paper presents shear deformation characteristics in reinforced concrete beams. Based on the relationship between shear and bending moment in beams subjected to combined shear and bending, the behavior of a beam is explicitly divided into two base components of the flexural action and the tied arch action. Transverse elongation of the web and deflections are calculated from shear compatibility condition in a beam and compared with test results.

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Effect of shear deformation on adhesive stresses in plated concrete beams: Analytical solutions

  • Touati, Mahmoud;Tounsi, Abdelouahed;Benguediab, Mohamed
    • Computers and Concrete
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    • v.15 no.3
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    • pp.337-355
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    • 2015
  • In this scientific work, an improved analytical solution for adhesive stresses in a concrete beam bonded with the FRP plate is developed by including the effect of the adherend shear deformations. The analysis is based on the deformation compatibility approach where both the shear and normal stresses are assumed to be invariant across the adhesive layer thickness. The shear stress distribution is supposed to be parabolic across the depth of the adherends in computing the adhesive shear stress and Timoshenko's beam theory is employed in predicting adhesive normal stress to consider the shear deformation. Numerical results from the present analysis are presented both to demonstrate the advantages of the present solution over existing ones and to illustrate the main characteristics of adhesive stress distributions.