http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Todor Vacev (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Analysis of Stressed Skin Behaviour of a Steel Façade Frame Under Varying Structural Conditions
Todor Vacev,Andrija Zorić,Slobodan Ranković,Miloš Milić,Stepa Paunović,Ivan Nešović 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.1
Steel structures are traditionally designed neglecting the in-plane bearing capacity of the cladding. However, the cladding can act in coordination with the main structure, behaving as a diaphragm and contributing to its spatial stability, enabling the so-called stressed skin concept design . The subject of this paper was an analysis of behaviour of a sample steel frame cladded with corrugated sheet metal, and connected to each other by self-tapping screws. Various conditions regarding the set and the number of fastening devices, as well as method of numerical modelling of fasteners, type of the corrugated sheet metal, and overall dimensions of the frame were analysed using FEM and ANSYS workbench software, including geometric and material nonlinearity. Results can serve as useful and reliable design guidelines, and as an argument for further propagation of the stressed skin concept design as a rational design approach for steel structures.
-
Todor Vacev,Ivan Nešović,Miloš Milić,Andrija Zorić,Stepa Paunović 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
Profi led sheets are widely used in modern steel structures, either as cladding or as casing in composite structures. Strength calculation of such structures is a crucial design issue, and it represents a complex task because one must deal with thinwalled structures that have complicated cross-section shape. Manufacturers of these structural elements provide data about its strength, mostly based on experimental testing. However, catalogues provide little data about the supporting conditions at the ends that may have infl uence on structural strength. In this research, the fi nite element method analysis with geometrical and material nonlinearity and contact analysis in the support zones was applied for the strength calculation of a profi led steel sheet with very high depth. The analysis encompassed determination of the ultimate limit strength and serviceability limit strength with limited defl ection. All analyses were conducted for surface load applied over the area of one sheet. Thereat, infl uence of several factors related to support conditions was considered: friction on the supports, support width, and number of fasteners. Failure mechanisms were also analysed. Obtained results were compared with other sources and methods, like analytical solution, manufacturer’s software, and catalogue data. Results of the research showed that behaviour and strength of those elements depend to the great extent on end support detailing, which cannot be encompassed by classical calculation methods and linear analysis. Signifi cance of the support conditions was proven, and attention was paid on absence of such data in published catalogues.
-
Stressed Skin Design Versus Braced Frame Design Through Efficient Numerical Modelling
Todor Vacev,Andrija Zorić,Miloš Milić,Stepa Paunović,Ivan Nešović 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.4
Steel frame structures are traditionally designed with bracings that stabilize the main bearing structure. Another approach is to apply the “stressed skin design” where the cladding structure takes the role of the bracings. In this research, the two approaches were analysed and compared in order to fi nd advantages of any. A typical steel frame structure was chosen, and for the cladding, trapezoidal sheet metal was selected. Optional bracings were also considered. All static analyses were done using the fi nite element method (FEM) and ANSYS Workbench software, including geometric and material nonlinearity. The structure was loaded perpendicularly to its gable, thus simulating typical wind action. Number of fasteners connecting the cladding and the frame is crucial for the “stressed skin design” concept, so this parameter was varied through the analysis. The stiff ness of the fastener devices was simulated in two ways: (1) simplifi ed, by merging of the adjacent nodes of the cladding and the frame, and (2) more accurately, using special joint elements with prescribed stiff ness. Obtained stresses and deformations were compared, and they showed obvious advantages of the “stressed skin design” over braced frame design, both in structural, and in economical aspect. In addition, important practical guidelines for the “stressed skin design” using FEM were proposed.
-
Zoran Bonic´,Nebojsˇ a Davidovic´,Todor Vacev,Nikola Romic,Elefterija Zlatanovic´,Jelena Savicˇ 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.4
Punching shear resistance of column footings and foundation slabs varies significantly in different standards. The reason for this is because standards define differently the position of the critical perimeter in which the punching shear resistance should be determined, and quantify the influences of the main parameters like effective depth, shear slenderness, compressive strength of concrete, longitudinal reinforcement ratio and tension yield stress of reinforcement in different ways. In order to quantify the level of safety in Eurocode 2 and in fib MC 2010, their design results are compared with the test results of the series of footings tested in completely realistic boundary conditions in terms of the subgrade soil. Besides the performed tests results, the analysis of the other investigations of the footing punching rested on the real soil is also included. Thus was obtained the answer to the question how individual characteristics of the footings and of the soil affect the punching bearing resistance and how accurately Eurocode 2 and fib MC 2010 predict the bearing capacity of the tested column footings. At the end, based on the test results and on the tests of others, and on and performed numerical analyses, a possible modification of Eurocode 2 in the field of reinforced concrete footing was proposed.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
