• Title/Summary/Keyword: proposed equation

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Proposal on the Prediction Equation of Ultimate stress of External Tendon for the Prestressed Concrete Beams with External Tendons (외부 PSC 보에서 외부강선의 극한 응력 예측식 제안)

  • Yoo, Sung-Won;Ha, Heon-Jae
    • Journal of the Korean Society of Safety
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    • v.25 no.5
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    • pp.44-53
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    • 2010
  • Recently, the external prestressed concrete structures are increasingly being built. The mechanical behavior of prestressed concrete beams with unbonded tendon is different from that of normal bonded PSC beams in that the increment of tendon stress was derived by whole member behavior. By this reason, the ultimate stress of external tendon is smaller than that of bonded tendon or internal unbonded tendon. However, in the domestic and abroad code, the equation of ultimate stress of external tendon is not suggested yet, and the equation of ultimate stress of internal unbonded tendon is used instead of that of external tendon. Therefore, in this paper, after effective variables of ultimate stress of external tendon were analyzed, the analytical equation of ultimate stress of external tendon was proposed. And the reasonable coefficients were proposed by statistical work of test results of 25 beam with external tendon. Finally, the practical proposed equation of ultimate stress of external tendon was proposed with analytical and statistical model. The equation of ACI-318 and AASHTO 1994 were not matched with test results and had no correlations, and the proposed equation was well matched with test results. So the proposed equation in this paper will be a effective basis for the evaluation of external tendons in analysis and design.

Model Equation for Shear Strength of Reinforced Concrete Beams without Web Reinforcement (전단보강근이 없는 철근콘크리트 보의 전단강도 예측 모델식 제안)

  • 김진근;박연동
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.04a
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    • pp.124-129
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    • 1993
  • In this study, a simple and accurate model equation for prediction of shear strength of reinforce concrete beams without web, reinforcement is proposed based on basic shear transfer mechanism and modified Bazant's size effect law. The proposed equation includes the effects of concrete strength, longitudinal steel ratio, shear span to depth ratio and effective depth. Comparisons with published experimental data indicate that the proposed equation estimates properly the effects of these factors. Among many equations, ACI code equation, Zsutty's equation and Bazant's equation are selected for comparison. As the result, the accuracy of the proposed equation is better than that of any other equations.

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Dynamic Analysis of Concrete Rigid Barriers by Computer Simulation (컴퓨터 시뮬레이션에 의한 콘크리트 교량난간의 동적거동 분석)

  • 김재일;안재석;박진환;우광성
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2004.04a
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    • pp.217-224
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    • 2004
  • This paper proposed a new impact equation by analyzing the form of the proposal section 1 and section 2 proposed by Korea Highway Corporation, F-type, NJ-type and SS-type with HVOSM program Because the impact equation proposed by Ministry Construction & Transportation(1992) considered an only impact velocity, the values of impact loads calculated by HVOSM program are 21.5∼44 times as large as those using equation of MCT. The values of HVOSM program are 1.4 times as large as those of Olson's model because Olson's equation consider impact vehicle, impact velocity and impact angle. But, it does not consider geometric characters, while HVOSM program considers characters. Considering the shapes of sections and the conditions of colliding, HVOSM program can calculate imuact load. As Multiple Regression Analysis is conducted with the calculated values, the R² values of the proposed equations are 0.984 in SB1∼SB3 and 0.958 in SB4∼SB6. After all, the equation proposed in this study have better results than Olson's equation.

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Prediction of Shear Strength in High-Strength Concrete Beams Considering Size Effect (크기효과를 고려한 고강도 콘크리트 보의 전단강도 예측식 제안)

  • 배영훈;윤영수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.878-883
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    • 2003
  • To modify some problems of ACI shear provisions, ultimate shear strength equation considering size effect and arch action to compute shear strength in high-strength concrete beams without stirrups is presented in this research. Three basic equations, namely size reduction factor, rho factor, and arch action factor, are derived from crack band model of fracture mechanics, analysis of previous some shear equations for longitudinal reinforcement ratio, and concrete strut described as linear function in deep beams. Constants of basic equations are determined using statistical analysis of previous shear testing data. To verify proposed shear equation for each variable, namely d, , ρ, f/sub c/' and aid, about 250 experimental data are used and proposed shear equation is compared with ACI 318-99 code, CEB-FIP Model code, Kim & Park's equation and Zsutty's equation. While proposed shear equation is simpler than other shear equations, it is shown to be economical predictions and reasonable safety margin. Hence proposed shear strength equation is expected to be applied to practice shear design.

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Calculation of Consolidation Settlement considering Primary and Secondary Settlement (1차와 2차 침하를 고려한 압밀침하량 계산식의 제안)

  • Lee, Dal-Won;Jeong, Seong-Gyu
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2003.10a
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    • pp.159-162
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    • 2003
  • In this study, it was proposed that a modified equation for estimating consolidation settlement on soft clay ground, which separate total settlement into primary and secondary settlement equation. The settlement by the proposed equation and by the measured settlements from laboratory model test was compared and verified for its application. It was appeared that the proposed equation from the laboratory model test approached to be more realistic comparing to the result of Terzaghi's equation. From the above application, it was concluded that the final settlement prediction by the Hyperbolic, Asaoka methods is needed to measure the initial period of settlement but the proposed equation could be much applicable in the lacking condition of measured data of the initial period.

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A Consolidation Settlement Prediction Considering Primary and Secondary Consolidation (1차와 2차 침하를 고려한 압밀침하량 예측)

  • Lee, Dal-Won;Jeong, Seong-Gyu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.47 no.1
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    • pp.61-68
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    • 2005
  • In this study, it was proposed that an equation for predicting consolidation settlement on soft clay ground, which separate total settlement into primary and secondary consolidation settlement equation. The consolidation settlements by the proposed equation and by the measured settlements from laboratory model test were compared and verified for its application. It was appeared that the proposed equation from the laboratory model test approach to be more realistic comparing to !the result of Terzaghi's equation. From the above application, it was concluded that the final settlement prediction by. the Hyperbolic, Asaoka methods is needed to the initial settlement but the proposed equation could be much applicable in the lacking condition of measured data of the initial period.

Evaluation of Minimum Shear Reinforcement Content of Reinforced Concrete Beams (철근콘크리트 보의 최소전단철근비 예측)

  • 윤성현;이정윤;김상우
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.253-258
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    • 2002
  • An evaluation equation of the minimum shear reinforcement content for reinforced concrete beams was theoretically proposed. The proposed equation takes into account the effects of compressive strength of concrete, longitudinal reinforcement content and shear span ratio. The proposed equation was compared with the current ACI 318-99 and CSA A23.3-94 codes.

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Verification of Proposed Design Equation for Stress Evaluation of Unbonded Tendons (비부착 긴장재의 응력을 평가하기 위해 제안된 설계식의 타당성검증)

  • Lim, Jae-Hyung;Moon, Jeong-Ho;Lee, Li-Hyung
    • Magazine of the Korea Concrete Institute
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    • v.11 no.2
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    • pp.127-137
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    • 1999
  • In the previous study in relation to the current study, a test program for the verification of the proposed design equation was carried with fourteen prestressed concrete beams with unbonded tendons. Experimental results were compared with the computed results by the proposed design equations. The previous design equations are ACI code, AASHTO LRFD code, the analysis equation with the strain compatibility, Harajli/Kanj' design equation, Chakrabarti' design equation. As a result of comparative studies, it turned out that the proposed design equation could predict the ultimate tendon stress with comparatively high accuracy.

ON SOLVING FUZZY EQUATION

  • Hong, Dug-Hun
    • Journal of applied mathematics & informatics
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    • v.8 no.1
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    • pp.213-223
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    • 2001
  • The use of fuzzy number over interval of confidence instead of possibilitic consideration for solving fuzzy equation is proposed. This approach of solving fuzzy equation by interval arithmetic and ${\alpha}$-cuts has a considerable advantage. Through theoretical analysis, an illustrative example and computational results, we show that the proposed approach is more general and straight-forword.

A Modified Equation of Parameter of Surface Blast Load (표면 폭발하중 파라메타의 수정 산정식)

  • Jeon, Doo-Jin;Kim, Ki-Tae;Han, Sang-Eul
    • Journal of Korean Association for Spatial Structures
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    • v.17 no.3
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    • pp.75-82
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    • 2017
  • The Kingery-Bulmash equation is the most common equation to calculate blast load. However, the Kingery-Bulmash equation is complicated. In this paper, a modified equation for surface blast load is proposed. The equation is based on Kingery-Bulmash equation. The proposed equation requires a brief calculation process, and the number of coefficients is reduced under 5. As a result, each parameter obtained by using the modified equation has less than 1% of error range comparing with the result by using Kingery-Bulmash equation. The modified equation may replace the original equation with brief process to calculate.