• Title/Summary/Keyword: Euro code

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GNSS 이용 시각비교 통합 모니터링

  • Kim, Jun-Hwan;Yang, Seong-Hun;Lee, Yeong-Gyu;Lee, Seung-U;Lee, Chang-Bok;Kim, Gi-Du
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.482-485
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    • 2006
  • 다채널 시각비교 수신기(R100-40T, Euro-80)를 이용한 GPS C/A 코드 시각비교 데이터와 Ashtech Z12T 수신기를 이용한 P3 코드 시각비교 데이터를 통합 모니터링함으로서, 간편하게 시각비교 결과를 확인 할 수 있게 GUI(Graphic User Interface) 환경으로 구현하였다. 수신기들은 현재 KRISS(Korea Research Institute of Standards and Science)에서 사용 중인 위성이용 시각비교 수신기들이다. 본 시각비교 통합 모니터링 프로세스를 통해서 GPS C/A code 시각비교 데이터와 P3 code 시각비교 데이터 각각을 비교 분석함으로써 시각비교 결과의 신뢰성을 검증하는데 사용한다.

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Overview of Seismic Loads and Application of Local Code Provisions for Tall Buildings in Baku, Azerbaijan

  • Choi, Hi Sun;Sze, James;Ihtiyar, Onur;Joseph, Leonard
    • International Journal of High-Rise Buildings
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    • v.3 no.1
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    • pp.65-71
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    • 2014
  • Baku, the capital of Azerbaijan, has seen a boom in construction in recent years. The old Baku city has been rapidly transforming into a new hub of high-rise buildings and lively cultural centers hosting the Euro Vision Song Contest in 2012 and European Games in 2015. A major population shift to Baku from its suburbs and the countryside has resulted in the doubling of Baku's population in the 4 years between 2009 and 2013. As of January 2013, Baku's population reached four million people, 43% of the citizens in Azerbaijan according to The State Statistical Committee of Azerbaijan. With this trend, the city needs more high-rise buildings to accommodate rapidly increasing demands for more housing and business space. Until the Azerbaijan Seismic Building Code was published in 2010 and became effective, many different seismic criteria, in terms of building codes and seismic intensities, were used for all new high-rise projects in Baku. Some designers used the SNIP (Russian) code with seismic level 9 or level 8 with 1 point penalty. Others used the Turkish code with Seismic Zone 1, UBC 97 with Zone 2 through 4, or IBC with Sa = 0.75 g through 1.0 g. The seismic intensity is now clarified with the Azerbaijan Seismic Building Code. However, the Azerbaijan Seismic Building Code is appropriate for low-rise buildings applications but may be inappropriate for high-rise project applications. This is because the code-defined response spectrum yields unrealistically conservative seismic forces for high-rise buildings with long periods, as compared to those determined by other internationally accepted building codes. This paper provides observations and recommendations for code-based seismic load assessment of high-rise buildings in the Baku area.

An Experimental Study on the Temperature Difference between the Top and Bottom Flange in Steel Girder without Concrete Slab (콘크리트 슬래브가 없는 강재주형에서 상하연 온도차에 대한 실측연구)

  • Shin, Dong-Wook;Kim, Kyoung-Nam;Jung, Kyoung-Sup;Lee, Seong-Haeng
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.18 no.4
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    • pp.99-106
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    • 2014
  • In order to study the reasonable design thermal loads, the steel box girder bridge specimen which have no concrete slab was manufactured with the real size dimension. The temperature data were measured for 5 month at the 18 thermo gauges which were attached according to height. The temperature differences between the top and bottom flange in steel box girder specimen were calculated and the temperature gradient models were proposed by the probabilistic method. This proposed model showed a correlation of approximately 97% when compared with the similar model of Euro Code. Thus, the temperature gradient models which were suggested in this study may be used as the basis data in calculating the design load temperature.

The design of reinforced concrete beams for shear in current practice: A new analytical model

  • Londhe, R.S.
    • Structural Engineering and Mechanics
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    • v.31 no.2
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    • pp.225-235
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    • 2009
  • The present paper reviews the shear design (of reinforced concrete beam) provisions of four different national codes and proposes a new but simplified shear strength empirical expression, incorporating variables such as compressive strength of concrete, percentage of longitudinal and vertical steel/s, depth of beam in terms of shear span-to-depth ratio, for reinforced concrete (RC) beams without shear reinforcement. The expression is based on the experimental investigation on RC beams without shear reinforcement. Further, the comparisons of shear design provisions of four National codes viz.: (i) IS 456-2000, (iii) BS 8110-1997, (iv) ACI 318-2002 (v) EuroCode-2-2002 and the proposed expression for the prediction of shear capacity of normal beam/s, have been made by solving a numerical example. The results of the numerical example worked out suggest that there is need for revision in the shear design procedure of different codes. Also, the proposed expression is less conservative among the IS, BS & Eurocode.

An Analysis and Evaluation of Fire Resistance Performance for the Protected Steel Columns in Korea (국내 피복 철골기둥의 내화 성능 분석 및 평가)

  • Shin, Tae Song
    • Journal of Korean Society of Steel Construction
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    • v.21 no.1
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    • pp.27-35
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    • 2009
  • Main structural steel members need fire-resistance measures to ensure their fire-resistance performance for a prescribed time. This paper analyzes and evaluates the fire-resistance performance of approved Korean fire-protection products for steel columns. These products are classified into products for board protection and for spray protection, samples of which were selected for the analysis. The fire-resistance performance was analyzed on the basis of Korean and European standards. The Korean standards are considered additional to the Euro-code standards for performance design. The Korean standards generally take more precautions to ensure safety on the temperature side, but require the reflection of material properties, the steel temperature calculation methodology, the profile factor, and the strength verification in a fire.

Appliance of Slab tracks on the Prestressed Concrete Bridges (슬래브궤도의 콘크리트교량 적용성 검토)

  • Kim, Nam-Hoon;Lim, Young-Su;Shin, Yong-Joon
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1037-1043
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    • 2007
  • The railroad systems with the ballast tracks have been widely used for a long time. But recently, the use of the slab track is being increased gradually with a technical developments. So, this paper deals with the appliance of the slab tracks on the railroad bridges. Firstly, review the design criteria of the railroad bridges related to the slab tracks for the stability and serviceability, based on DIN and EURO code. Then, perform the analysis of the railroad prestressed concrete bridges, and check whether the results of the analysis satisfy the design criteria. Finally, find the construction condition of bridges that all the design criteria are satisfied. As a result, to maintain the stability and serviceability of the bridges, bridges must have some restrictions, including a time of installation of the slab tracks. So, the construction schedule for the erection of the bridges will be carefully considered in case of the concrete railroad bridges with the slab tracks.

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Load Capacity Assesment of Reinforced Concrete Deep Beams using Nonlinear Finite Element Analysis (비선형 유한요소해석을 이용한 철근콘크리트 깊은 보의 내하력 평가)

  • Cheon Ju Hyun;Kim Tae Hoon;Lee Sang Cheol;Shin Hyun Mock
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.147-150
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    • 2005
  • This paper presents a method for the load capacity assesment of reinforcement concrete deep beams using nonlinear finite element analysis. A computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. From the results, determine the reliability index for the failure base from the Euro Code. Then, calculated additional reduction coefficient to satisfy the goals from the reliability analysis. The proposed numerical method for the load capacity assesment of reinforced concrete deep beams is verified by comparison with the others methods

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Flexible Concept Applicable to Railway (유연성 원리를 이용한 철도변 사면보강시스템 적용사레연구)

  • Choi Yu-Kyung;Choi Seung-Il;Ro Byung-Don;Kim Hyung-Min
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.203-210
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    • 2005
  • Rockey slopes adjacent to railways are disclosed from severe weathering and hazard of failure of themselves. Consequently it causes directly rockfall or landsliding on the railway. Conventional solutions-rigid system like rocksheds, shotcrete, retaining walls, etc to these causes are limited to protect train, rail, our properties and lives from the harmful attack - rockfall. debris flow and sliding. Flexible concept for solutions with passive and active type method based on Euro Code 7 capable of high energy absorption and light materials are rapidly replacing the rigid systems with natural friendly, early installation, cost and time saving and reducing danger in works all over the world.

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Influence of Various Parameter for Nonlinear Finite Element Analysis of FRP-Concrete Composite Beam Using Concrete Damaged Plasticity Model (콘크리트 손상 소성모델을 이용한 FRP-콘크리트 합성보의 비선형 유한요소해석에서 여러 변수들의 영향)

  • Yoo, Seung-Woon;Kang, Ga-Ram
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.2
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    • pp.697-703
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    • 2017
  • This paper examines the flexure behavior of FRP-concrete composite structure that can replace conventional reinforced concrete structure types. In order to investigate the structural performance and behavioral characteristics in numerical analysis means, ABAQUS, a general purpose finite element analysis program, was utilized for nonlinear finite element analysis, and the various variables and their influences were analyzed and compared with experimental results to suggest values optimized to this composite structure. The concrete damage plasticity model and Euro code for concrete were used. In the implicit finite element analysis, the convergence was ambiguous when geometrical and material nonlinearity were large, so the explicit finite element analysis used in this study was deemed to be appropriate. From the comparison with the experiment about concrete damaged plasticity model, 20mm for the mesh size, $30^{\circ}$ for the dilation angle, $100Nmm/mm^2$ for the value of fracture energy, 0.667 for Kc value, and the consideration of damage parameter were suggested believed to be appropriate. The numerical model suggested in this study was able to imitate the ultimate load and cracking pattern very well; therefore, it is expected to be utilized in research of various new material composite structures.

Reliability of Load-Carrying Capacity of RC Deep Beams (철근콘크리트 깊은 보의 내하력에 대한신뢰도 평가)

  • Cheon Ju-Hyun;Kim Tae-Hoon;Lee Sang-Cheol;Shin Hyun-Mock
    • Journal of the Korea Concrete Institute
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    • v.17 no.6 s.90
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    • pp.955-962
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    • 2005
  • Still no accurate theory exists for predicting ultimate shear strength of deep reinforced concrete beams because of the structural and material non-linearity after cracking. Currently, the load capacity assesment is performed for the upper structure of the bridges and containing non-reliability in the applications and results. The purpose in this study is to evaluate analytically the complex shear behaviors and normal strength for the reinforced concrete deep beams and to offer the accuracy load capacity assesment method based on the reliability theories. This paper presents a method for the load capacity assesment of reinforcement concrete deep beams using nonlinear finite element analysis. A computer program named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material non-linearity is taken Into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. From the results, determine the reliability index for the failure base on the Euro Code. Then, calculate additional reduction coefficient to satisfy the goals from the reliability analysis. The proposed numerical method for the load capacity assesment of reinforced concrete deep beams is verified by comparison with the others methods.