• Title/Summary/Keyword: Euro code

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A Study on the Flexural Minimum Reinforcement for Prevention of Brittle Failure Specified in KCI and EN Codes (유럽과 국내기준에 규정된 취성파괴 방지를 위한 휨 최소철근량 고찰)

  • Park, Sung-Jae;Kang, Tae-Sung;Moon, Do-Young
    • Journal of the Korea Concrete Institute
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    • v.26 no.2
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    • pp.211-218
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    • 2014
  • In the design of reinforced rectangular concrete beam structure, the minimum amount of flexural reinforcement is required to avoid brittle failure. KCI code is based on concept of ultimate strength and usually used as a model code. But bridge design code enacted by Ministry of land, transportation and maritime affairs in 2012 is based on concept of limit state and similar to Euro code EN 1992-2. This means that the minimum reinforcement presented in both design codes has different origination and safety margin. When rectangular concrete beams with minimum reinforcement are designed according to EN and KCI codes, the amount of minimum reinforcement specified in EN code is only 76% of that in KCI code. This makes the design engineers to be confused. In this study, flexural tests were conducted on nine beams with the two different minimum reinforcement specified in KCI and EN design codes. In results, the measured ratios of nominal strength to crack strength from the test were about 25% greater than those evaluated from the equations presented in KCI and EN codes. The EN beams having only 76% of the minimum reinforcement for the KCI beams were fractured by rupture of steel reinforcement but in ductile manner. It is confirmed that the minimum reinforcement concrete beams designed according to both codes have enough safety margin in flexural capacity and moreover in ductility.

An Investigation into differences between codes for the Moment Strength of Deck Plates (데크플레이트의 휨 강도에 관한 기준 비교 연구)

  • Shin, Tae Song
    • Journal of Korean Society of Steel Construction
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    • v.15 no.1
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    • pp.25-31
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    • 2003
  • This research aimed to experimentally and theoretically investigate the moment strength of deck plates. A moment experiment was carried out using a full-scale 14 specimen. To prevent local buckling, the point load was applied at 1/4 points. After the experiment, theoretical analysis was conducted and the differences between various codes were identified. The experimental results were compared with AISI (the American Iron and Steel Institute), EC (Euro Code) 3, and KS (Korea Standard) codes. Analysis results are summarized as follows: (1) the failure mode was influenced by local buckling at the midpoint of the beam and/or at the intermediate loading point: (2) if yielding first occurred at the tension side, the moment strength would increase as the plastic reservation of the tension zone acted: (3) the experimental results were closest to the EC3 codes in which the partial plastic reservation was considered; (4) statistical evaluation based on the EC3 Annex Z showed that the partial resistance safety coefficient calculated applying to the EC3 formula, $^{\circ}{_M}$, was placed within 1.1 which was the target value of EC3 code; and (5) the analytical power of AISI and KS codeswere expected to improve into the level of EC3 codes if the concept of plastic reservation of the tension side would be introduced to them.

Evaluation of Effective Temperature for Estimate Design Thermal Loads in Steel Deck of Steel Box Girder Bridges (강상자형교의 강바닥판에서 설계온도하중을 위한 유효온도 산정)

  • Shin, Dong-Wook;Kim, Kyoung-Nam;Choi, Chul-Ho;Lee, Seong-Haeng
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.6
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    • pp.77-87
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    • 2013
  • A present LSD (limited state design) code for temperature load in the domestic bridge design has applied a uniform standard for various bridge types. In this study, in order to calculate the effective temperature, a specimen of steel box girder bridge section with real size dimension was manufactured. For a year, the temperature data were measured at the 18 point in steel deck of steel box girder bridges specimen. Effective temperature within the cross section according to atmospheric temperature was calculated by this experiment data. The analyzed results were very similar correlation when compared with the effective temperature of the Euro Code. Therefore, the effective temperature which calculated based on the present data could be used as the basic data in order to present to the appropriate design criteria for the thermal loads on the domestic bridge design.

Charring Properties of Glued Laminated Timber Columns using Domestic Larch Exposed to High Temperatures (고온에 노출된 국내산 낙엽송 구조용 집성재 기둥의 탄화 특성)

  • An, Jae-Hong;Choi, Yun-Jeong;Kim, Se-Jong
    • Journal of the Korea Institute of Building Construction
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    • v.23 no.1
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    • pp.23-33
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    • 2023
  • It is widely known that the level of fire resistance of wooden structure is determined by a charring rate or charring depth, and these are adopted for fire design. In this study, specimens of domestic larch column with a lamination wooden type were prepared and the fire resistance properties such as the charring depth, load ratio and the specific charring rate suggested by EN Code investigated. Test results showed that as expected, the weakest part was the corner of the column, so that the charring depth of the corner was deeper than the other parts of the column. For the load ratio less than 0.9, it had little effect on the charring depth.

Optimum design of laterally-supported castellated beams using CBO algorithm

  • Kaveh, A.;Shokohi, F.
    • Steel and Composite Structures
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    • v.18 no.2
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    • pp.305-324
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    • 2015
  • In this study, two common types of laterally supported castellated beams are considered as design problems: beams with hexagonal openings and beams with circular openings. The main goal of manufacturing these beams is to increase the moment of inertia and section modulus, which results in greater strength and rigidity. These types of open-web beams have found widespread use, primarily in buildings, because of great savings in materials and construction costs. Hence, the minimum cost is taken as the design objective function and the Colliding Bodies Optimization (CBO) method is utilized for obtaining the solution of the design problem. The design methods used in this study are consistent with BS5950 Part 1 and Part 3, and Euro Code 3. A number of design examples are considered to optimize by CBO algorithm. Comparison of the optimal solution of the CBO algorithm with those of the Enhanced Charged System Search (ECSS) method demonstrate the capability of CBO in solving the present type of design problem. It is also observed that optimization results obtained by the CBO algorithm for three design examples have less cost in comparison to the results of the ECSS algorithm. From the results obtained in this paper, it can be concluded that the use of beam with hexagonal opening requires smaller amount of steel material and it is superior to the cellular beam from the cost point of view.

Explicit Nonlinear Finite Element Analysis for Flexure Behavior of FRP-Concrete Composite Beam (FRP-콘크리트 합성보의 휨거동에 관한 외연적 비선형 유한요소해석 연구)

  • Yoo, Seung Woon;Kang, Ga Ram
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.37 no.2
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    • pp.269-276
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    • 2017
  • In order to study ultimate flexure behavior of FRP-concrete composite structures which can replace reinforced concrete structures, ABAQUS, a general purpose analysis program, was utilized for numerical nonlinear analysis of structural performance and behavior characteristics of FRP-concrete composite beams. Explicit nonlinear finite element analysis was conducted and the numerical results were compared with previous experiments. Concrete damaged plasticity model was adopted as material properties of concrete and Euro code was used as compressive stress state. Nonlinear analysis was performed for four different types of FRP-concrete composite beams, and ultimate load and cracking pattern was compared and analyzed. The model suggested in this research was able to simulate ultimate load and cracking pattern properly, it is expected to be utilized in study of precise structural and behavioral characteristics of various FRP-concrete composite structures.

Establishing optimal gap size for precast beam bridges with a buffer-gap-elastomeric bearings system

  • Farag, Mousa M.N.;Mehanny, Sameh S.F.;Bakhoum, Mourad M.
    • Earthquakes and Structures
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    • v.9 no.1
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    • pp.195-219
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    • 2015
  • A partial (hybrid) seismic isolation scheme for precast girder bridges in the form of a "buffer-gap-elastomeric bearings" system has been endorsed in the literature as an efficient seismic design system. However, no guides exist to detail an optimal gap size for different configurations. A numerical study is established herein for different scenarios according to Euro code seismic requirements in order to develop guidelines for the selection of optimal buffer-gap arrangements for various design cases. Various schemes are hence designed for ductile and limited ductility behavior of the bridge piers for different seismic demand levels. Seven real ground records are selected to perform incremental dynamic analysis of the bridges up to failure. Bridges with typical short and high piers are studied; and different values of initial gaps at piers are also investigated varying from a zero gap (i.e., fully locked) condition up to an initial gap at piers that is three quarters the gap left at abutments. Among the main conclusions is that the as-built initial gaps at piers (and especially large gap sizes that are ${\geq}1/2$ as-built gaps at abutments) do not practically reduce the seismic design demand and do not affect the reserve capacity of the bridge against failure for bridges featuring long piers, especially when these bridges are designed a priori for ductile behavior. To the contrary, the "buffer-gap-elastomeric bearings" system is more effective for the bridge schemes with short piers having a large difference between the stiffness of the bearings and that of their supporting (much stiffer) squat piers, particularly for designs with limited ductility. Such effectiveness is even amplified for the case of larger initial as-built gap sizes at piers.

Analysis of extended end plate connection equipped with SMA bolts using component method

  • Toghroli, Ali;Nasirianfar, Mohammad Sadegh;Shariati, Ali;Khorami, Majid;Paknahad, Masoud;Ahmadi, Masoud;Gharehaghaj, Behnam;Zandi, Yousef
    • Steel and Composite Structures
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    • v.36 no.2
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    • pp.213-228
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    • 2020
  • Shape Memory Alloys (SMAs) are new materials used in various fields of science and engineering, one of which is civil engineering. Owing to their distinguished capabilities such as super elasticity, energy dissipation, and tolerating cyclic deformations, these materials have been of interest to engineers. On the other hand, the connections of a steel structure are of paramount importance because of their vulnerabilities during an earthquake. Therefore, it is indispensable to find approaches to augment the efficiency and safety of the connection. This research investigates the behavior of steel connections with extended end plates equipped hybridly with 8 rows of high strength bolts as well as Nitinol superelastic SMA bolts. The connections are studied using component method in dual form. In this method, the components affecting the connections behavior, such as beam flange, beam web, column web, extended end plate, and bolts are considered as parallel and series springs according to the Euro-Code3. Then, the nonlinear force- displacement response of the connection is presented in the form of moment-rotation curve. The results obtained from this survey demonstrate that the connection has ductility, in addition to its high strength, due to high ductility of SMA bolts.

Plantar foot pressure distribution depending on ground conditions and shoe type (지반조건과 신발의 종류에 따른 족저압 분포)

  • Kim, Sang-Hwan;Lee, Hye-Yoon;Kim, Yeon-Deok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.4
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    • pp.2899-2905
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    • 2015
  • This paper presents is a study on the pressure distribution families low in response to ground conditions. Indoor shoes, outdoor shoes, working shoes, are four categories of shoes sports shoes, has been used in the present study, Concrete to target men in their 20s of 45people wearing the 260mm(Euro Code EU40), the experiments were carried out in the sand ground. Measurement of stress and pressure at the time of walking, Techstorm company Insole System the measured toe of the foot using, foot binding, was the metatarsal, the low pressure come from Fujoku four areas measured. Depending on the shoes and ground conditions findings, the results of this study represents the distribution of other stress and pressure, is expected to be useful in the development of a wearable shoe sand soil.

A Study on the Enhancement of Fire Resistance Function in Primary Structure Department of Building Type Traditional Market (건물형 전통시장 화재발생시 피난안전성 확보를 위한 규모별 주요구조부 내화보강 연구)

  • Jang, Hye-Min;Hwang, Jung-Ha
    • Fire Science and Engineering
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    • v.34 no.4
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    • pp.87-95
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    • 2020
  • This study evaluates the safety of an asylum through a fire simulation of building Type traditional markets. We derive the building's indoor temperature, use the observed variation in temperature gradient to calculate the temperature of the main structure, and finally compares the time required to attain the limit temperature of the structure its time of escape. To ensure improved security of the asylum, the government has proposed a fire-resistance improvement plan for the major structural parts of buildings are not safe with thickness of 0.01 m and 0.035 m. F.ire-resistance reinforcement for small - and medium-sized vehicles is more than 0.025 m, in thickness; moreover safety can be ensured for medium and large-sized vehicles fire using fire resistant reinforcement of over 0.035 m. Accordingly, in order to ensure the safety of an asylum, fire-resistant reinforcement measures may be considered.