• Title, Summary, Keyword: Eurocode

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Review of Design Provisions for Earthquake Resistance of RC Structures in Eurocode 8 (RC 구조물에 대한 Eurocode 8의 내진설계 규준 검토)

  • 이한선;허윤섭;이주은
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.677-682
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    • 1999
  • In this paper, the basic concepts and main characteristics in Eurocode 8, which deals with earthquake-resistant design, are reviewed regarding the design of reinforced concrete structures. Eurocode uses the limit-state design method to satisfy the requirements of safety and serviceability. This kind of information can serve to establish the up-coming Korean seismic code which is comprehensive and appropriate to the moderate seismicity region by constituting an important part in the basic data-pool.

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Limit states design for tunnels: related researches and present state of application (터널 한계상태설계법 관련 연구 및 적용 동향)

  • Kim, Hong-Moon;Kim, Dong-Kook;Lee, Sang-Duk
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.3
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    • pp.341-346
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    • 2014
  • The representative Limit State Design(LSD) codes, AASHTO LRFD and Eurocodes, are widely being applied when designing civil structures. However, these codes are only applying tunnel lining design and segments design for shield tunnels. Recently in Europe, the Eurocode 7 committee was trying to create a research group called EG12, but they reluctantly decided not to create EG12 since it could have an impact on some of the other Eurocodes(including Eerocodes 2 and 3). Still there is an effort to continue researching LSD for tunnelling. LSD method will become the norm for the field of civil structural design in the near future. Therefore, it is important to fully understand Eurocode7:Geotechnical design in connection with Eurocode 2 and Eurocode 3. In addition, it is essential to follow international research trends and also to research for application to tunnelling.

Study on Deflection Evaluation for High-strength Concrete of KCI Specification and Eurocode 2 (콘크리트구조설계기준과 Eurocode 2의 고강도 콘크리트 처짐 산정에 관한 연구)

  • Lee, In-Ju;Kim, Tae-Wan;Kim, Sung-Hu;Son, Chang-Du;Park, Sun-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.989-992
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    • 2008
  • Recently, high-strength concrete has been frequently used for long-span bridges and high-rise buildings. Deflection of reinforced concrete structures is uncertain, so that many researchers have proposed various equations in order to predict deflection through experiments. Domestic concrete specification offers a procedure to evaluate deflection using effective moment of inertia which was proposed by Branson. However, it is inaccurate for high strength concrete compared to the method suggested in Eurocode 2 in that Eurocode 2 predicts deflection by using curvature integration of effective moment of inertia. In this study, experimental data about deflection of reinforced concrete beams were analyzed to compare domestic standard and Eurocode 2.

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An Analytical Study on Encased Steel Composite Columns Fire Resistance According to Axial Force Ratio (화재시 축력비에 따른 매입형 합성기둥의 내화성능에 대한 해석적 연구)

  • Kim, Ye-Som;Choi, Byong-Jeong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.1
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    • pp.97-107
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    • 2020
  • In this study, finite element analysis was carried out through the finite element analysis program (ANSYS) to investigate the fire resistance of composite columns in fire. Transient heat transfer analysis and static structural analysis were performed according to ASTM E 119 heating curve and axial force ratio 0.7, 0.6, 0.5 by applying stress-strain curves according to temperature, and loading heating experiments were carried out under the same conditions. In addition, the nominal compressive strength of the composite column according to the heating time according to the standard(Eurocode 4) was calculated and expressed as the axial force ratio and compared with the analytical and experimental values. Through the analysis, As a result of finite element analysis, the fire resistance time was 180 minutes and similar value to the experimental value was obtained, whereas the fire resistance time 150 minutes and 60 minutes were derived from the axial force ratios 0.6 and 0.7. In addition, it was confirmed that the fire resistance time according to the axial force ratio calculated according to the reference equation (Eurocode 4) was lower than the actual experimental value. However, it was confirmed that the standard(Eurocode 4) was higher than the experimental value at the axial force ratio of 0.7. Accordingly, it is possible to confirm the fire resistance characteristics(time-axial force ratio relationship) of the SRC column at high axial force, and to use the experimental and anaylsis data of the SRC column as the data for verification based on Eurocode.

Seismic design of irregular space steel frames using advanced methods of analysis

  • Vasilopoulos, A.A.;Bazeos, N.;Beskos, D.E.
    • Steel and Composite Structures
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    • v.8 no.1
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    • pp.53-83
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    • 2008
  • A rational and efficient seismic design methodology for irregular space steel frames using advanced methods of analysis in the framework of Eurocodes 8 and 3 is presented. This design methodology employs an advanced static or dynamic finite element method of analysis that takes into account geometrical and material non-linearities and member and frame imperfections. The inelastic static analysis (pushover) is employed with multimodal load along the height of the building combining the first few modes. The inelastic dynamic method in the time domain is employed with accelerograms taken from real earthquakes scaled so as to be compatible with the elastic design spectrum of Eurocode 8. The design procedure starts with assumed member sections, continues with the checking of the damage and ultimate limit states requirements, the serviceability requirements and ends with the adjustment of member sizes. Thus it can sufficiently capture the limit states of displacements, rotations, strength, stability and damage of the structure and its individual members so that separate member capacity checks through the interaction equations of Eurocode 3 or the usage of the conservative and crude q-factor suggested in Eurocode 8 are not required. Two numerical examples dealing with the seismic design of irregular space steel moment resisting frames are presented to illustrate the proposed method and demonstrate its advantages. The first considers a seven storey geometrically regular frame with in-plan eccentricities, while the second a six storey frame with a setback.

Eurocode 4: A modern code for the design of composite structures

  • Stark, Jan
    • Steel and Composite Structures
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    • v.5 no.4
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    • pp.327-343
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    • 2005
  • The European Standards Organisation (CEN) has planned to develop a complete set of harmonized European building standards. The Eurocodes, being the design standards, form part of this total system of European standards, together with standards for fabrication and erection and product standards. After a period of experimental use of the ENV(European Pre Standard)-versions of the Eurocodes, these are now converted into official EN's (European Standards). Design of composite steel and concrete buildings and bridges is covered by Eurocode 4. An overview will be given of the historic development of Eurocode 4, the structure and contents of the EN version and the present status and planning for completion. The Eurocode treatment of some selected technical items will be presented in more detail.

Numerical calculation of the wind action on buildings using Eurocode 1 atmospheric boundary layer velocity profiles

  • Lopes, M.F.P.;Paixao Conde, J.M.;Gomes, M. Gloria;Ferreira, J.G.
    • Wind and Structures
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    • v.13 no.6
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    • pp.487-498
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    • 2010
  • When designing structures to the wind action, the variation of the mean wind velocity and turbulence parameters with the height above the ground must be taken into account. This paper presents the numerical simulation results of atmospheric boundary layer (ABL) airflows, in a numerical domain with no obstacles and with a cubic building. The results of the flow characterization, obtained with the FLUENT CFD code were performed using the ${\kappa}-{\varepsilon}$ turbulence model with the MMK modification. The mean velocity and turbulence intensity profiles in the inflow boundary were defined in accordance with the Eurocode 1.4, for different conditions of aerodynamic roughness. The maintenance of the velocity and turbulence characteristics along the domain were evaluated in an empty domain for uniform incident flow and the ABL Eurocode velocity profiles. The pressure coefficients on a cubic building were calculated using these inflow conditions.

Flexural strength of circular concrete-filled tubes

  • Lee, Minsun;Kang, Thomas H.-K.
    • Advances in Computational Design
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    • v.1 no.4
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    • pp.297-313
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    • 2016
  • The flexural strength of circular concrete-filled tubes (CCFT) can be estimated by several codes such as ACI, AISC, and Eurocode 4. In AISC and Eurocode, two methods are recommended, which are the strain compatibility method (SCM) and the plastic stress distribution method (PSDM). The SCM of AISC is almost the same as the SCM of the ACI method, while the SCM of Eurocode is similar to the ACI method. Only the assumption of the compressive stress of concrete is different. The PSDM of Eurocode approach is also similar to the PSDM of AISC, but they have different definitions of material strength. The PSDM of AISC is relatively easier to use, because AISC provides closed-form equations for calculating the flexural strength. However, due to the complexity of calculation of circular shapes, it is quite difficult to determine the flexural strength of CCFT following other methods. Furthermore, all these methods give different estimations. In this study, an effort is made to review and compare the codes to identify their differences. The study also develops a computing program for the flexural strength of circular concrete filled tubes under pure bending that is in accordance with the codes. Finally, the developed computing algorithm, which is programmed in MATLAB, is used to generate design aid graphs for various steel grades and a variety of strengths of steel and concrete. These design aid graphs for CCFT beams can be used as a preliminary design tool.

An extension of an improved forced based design procedure for 3D steel structures

  • Peres, R.;Castro, J.M.;Bento, R.
    • Steel and Composite Structures
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    • v.22 no.5
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    • pp.1115-1140
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    • 2016
  • This paper proposes an extension of the Improved Forced Based Design procedure to 3D steel structures. The Improved Forced Based Design (IFBD) procedure consists of a more rational sequence of the design checks proposed in Eurocode 8 and involves a more realistic selection of the behaviour factor instead of selecting an empirical value based on the ductility class and lateral resisting system adopted. The design procedure was tested on a group of four 3D steel structures, composed by moment-resisting frames with three storeys height and the same plan configuration in all storeys. The plan configuration was defined in order to target lateral restrained or unrestrained systems as well as plan regular or irregular structures. The same group of structures was also designed according to the force-based process prescribed in Eurocode 8. The member sizes obtained through the two approaches were compared and the seismic performance was assessed through nonlinear static and time-history analyses. The limit states referred to structural and non-structural damage, considering the two levels design approach, which are the serviceability and the ultimate limit states, were examined. The results obtained reveal that the IFBD leads to more economical structures that still comply with the performance requirements prescribed in Eurocode 8.