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RISS 인기검색어
- 검색키워드
- 저자 : Dung M. Lue (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Numerical Evaluation on Warping Constants of General cold-Formed Steel Open Sections
Dung M. Lue,Jui-Ling Liu,Ching-Hau Lin 한국강구조학회 2007 International Journal of Steel Structures Vol.7 No.4
The calculation of warping constant (Cw) for an open thin-walled open section is a tedious and dificult task and thuspresenting an obstacle to routine design. Although Cw formulas and values for selective cold-formed steel sections are availablein the AISI design manuals, most practicing engineers have limited idea of evaluating the warping constants for sections notlisted in the AISI design manuals. This paper proposes a detailed step-by-step numerical procedure for evaluating the warpingconstant of a general open thin-waled section. Comparison shows virtualy no diference between the calculated values andthose listed in the AISI design manuals. The proposed procedure is a reliable and useful tool for computing the warping
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The Compressive Strength of Slender C-shaped Cold-formed Steel Members with Web Openings
Dung M. Lue,Ping-Tsung Chung,Jui-Ling Liu,Chi-Ling Pan 한국강구조학회 2009 International Journal of Steel Structures Vol.9 No.3
This study investigated the compressive strength of slender C-shaped cold-formed steel members with web openings. The effective sectional area concept was adopted to conduct the analysis of cold-formed compressive members. The load-carrying capacity of compression member was calculated based on the sectional effective width as described in the AISI Standard. The study tested a total of 21 channel specimens including C-shaped cross-sections with and without web openings. Comparisons were made between the test results and the predictions based on both the AISI Standard and the ANSYS analysis. The results indicated that all the observed failure modes were of the flexural-torsional buckling classification. It was found that the reduction in the compression strength of the specimens with web openings seems to be negligible. In addition, the predictions based on the AISI Standard were conservative as compared with the test results of the specimens with web openings. Moreover, it appeared that the ANSYS finite element analysis was able to predict the ultimate loads and failure modes of the specimens. In the absence of test data and for the purpose of preliminary design, the ANSYS appears to provide quite an encouraging prediction capability. This study investigated the compressive strength of slender C-shaped cold-formed steel members with web openings. The effective sectional area concept was adopted to conduct the analysis of cold-formed compressive members. The load-carrying capacity of compression member was calculated based on the sectional effective width as described in the AISI Standard. The study tested a total of 21 channel specimens including C-shaped cross-sections with and without web openings. Comparisons were made between the test results and the predictions based on both the AISI Standard and the ANSYS analysis. The results indicated that all the observed failure modes were of the flexural-torsional buckling classification. It was found that the reduction in the compression strength of the specimens with web openings seems to be negligible. In addition, the predictions based on the AISI Standard were conservative as compared with the test results of the specimens with web openings. Moreover, it appeared that the ANSYS finite element analysis was able to predict the ultimate loads and failure modes of the specimens. In the absence of test data and for the purpose of preliminary design, the ANSYS appears to provide quite an encouraging prediction capability.
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Design Aid for Moment Strength of Built-up Crane Runway Girders
Wei T. Hsu,Dung M. Lue,Y. Frank Chen 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.3
The evaluation of elastic moment for built-up crane runway girders is not an easy task as the difficulty involves the calculation of torsional properties including warping constant, the coefficient of monosymmetry, and torsion constant. To date,all AISC specifications offer no specific formulas for determining the elastic critical moment for WC (W-shape with Cap channel) or SC (S-shape with Cap Channel) girders. They provide only the approximate formulas which were derived from singly symmetric I-sections. Based on this study, the AISC approximate formulas would underestimate the elastic critical moment of WC/SC girders by 6-25% depending upon the unbraced length. This paper first summarizes the theoretical and AISC formulas for WC/SC girders. Theoretical torsional properties and relevant design parameters for WC/SC girders are computed and arranged in tabular form for design purposes. With these design values made available, engineers can perform more rational evaluation of WC/SC girders more conveniently. Lastly, a simplified but rational design approach is proposed for all available WC and SC girders listed in the AISC design manuals.
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