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RISS 인기검색어
- 검색키워드
- 저자 : M. Longshithung Patton (검색결과 4 건)
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Buckling of Fixed-ended Concrete-filled Steel Columns under Axial Compression
M. Longshithung Patton,Konjengbam Darunkumar Singh 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.3
In recent years, due to a relatively high price increase of nickel alloys, there is an increase in demand for lean duplex stainless steel (LDSS) with a low nickel content of ~1.5%, such as grade EN 1.4162. LDSS offers roughly twice the strength compared to austenitic stainless steels and has great potential for expanding future structural possibilities, enabling a reduction in the section sizes leading to lighter structures. This paper reports the buckling behavior of fixed-ended concrete-filled LDSS tubular (CFDSST) columns with L-, T-, and +-shape (Non-Rectangular Sections or NRSs) sections and a representative square section with varying lengths through Finite Element (FE) analysis. The purpose is to compare and assess the strength and deformation characteristics as well as the failure modes of such columns. It is seen that concrete-filled tubular columns with NRSs offered a better performance for all lengths considered, especially the T-shaped and +-shaped sections, in terms of strength. The influence of the cross-sectional shapes on the εu becomes less significant with increasing λ, but becomes increasingly significant with decreasing λ . The design standards show over conservative results for square and L-shape sections and conservative for T-shape and +-shape sections.
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Finite Element Modelling of Concrete-filled Lean Duplex Stainless Steel Tubular Stub Columns
M. Longshithung Patton,Konjengbam Darunkumar Singh 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
This paper presents a finite element (FE) study on concrete-filled lean duplex slender stainless steel tubular (CFDSST) stubcolumns of square and L-, T-, and +-shape (Non-Rectangular Sections or NRSs) sections under pure axial compression. Theeffect of cross-sectional shape and concrete compressive strength, by considering equal steel consumption (i.e. equal crosssectionalarea) for all the square and NRSs sections have been reported. In CFDSST stub columns, the axial deformation (δu)at ultimate load (Pu) decreases with increasing concrete strengths, but increases as the sections changes from Square→L→T→+-shape. For normal concrete strength (≤40 MPa), NRSs appear to have similar or slightly enhanced Pu, in comparison withthe representaive square section. But in the case of a high strength concrete core (i.e. >40 MPa), NRSs are clearly at adisadvantage as far as the values of Pu is concerned, however as the NRSs are lighter by 37%, they still offer an attractive optionfor the designers. The FE strengths over predicts the EN 1994-1-1 (2004) specification by about an average of 21, 19, 14, and4% for the square, L, T, and +-shape sections, respectively.
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Structural behaviour of stainless steel stub column under axial compression: a FE study
Kevinguto Khate,M. Longshithung Patton,Comingstarful Marthong 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
This paper presents a Finite Element (FE) study on Lean Duplex Stainless Steel stub column with built-up sections subjected to pure axial compression with column web spacing varied at diff erent position across the column fl anges. The thicknesses of the steel sections were from 2 to 7 mm to encompass a range of section slenderness. The aim is to study and compare the strength and deformation capacities as well as the failure modes of the built-up stub columns. The FE results have been compared with the un-factored design strengths predicted through EN1993-1-4 (2006) + A1 (2015) and ASCE8-02 standards, Continuous Strength Method (CSM) and Direct Strength Method (DSM). The results showed that the design rules generally under predict the bearing capacities of the specimens. It’s been observed that the CSM method off ers improved mean resistance and reduced scatter for both classes of cross-sections (i.e. slender and stocky sections) compared to the EN1993-1-4 (2006) + A1 (2015) and ASCE 8-02 design rules which are known to be conservative for stocky cross-sections.
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Karma Hissey Lepcha,Allan Lambor Marbaniang,M. Longshithung Patton,Aarti Khyriemmujat 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.3
The fl exural behaviour of lean duplex stainless steel tubular beams with web openings is presented. A fi nite element study is carried out on lean duplex stainless steel sections with web openings to determine the eff ects of the perforations on the bending capacity, deformed shapes and local buckling characteristics. The study also aims in particular for a comparison between sections having circular or extended openings with a wide range of section slenderness. The bending capacities from the fi nite element results are also compared with the American specifi cation, European specifi cation along with direct strength method. Both ASCE and EN can give a good prediction of the design strengths, however, the direct strength method showed unconservative predictions. Modifi cations have been proposed to both the ASCE specifi cation and the direct strength method for LDSS sections with web openings.
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