Lateral distortional buckling of cellular composite-beams
Abstract In the region of negative bending moments of continuous and semi-continuous steel and concrete composite beams, the inferior portion of the steel section is subjected to compression while the top flange is restricted by the slab, which may cause a global instability limit state know as late...
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| Language: | English |
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Instituto Brasileiro do Concreto (IBRACON)
2018-04-01
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| Series: | Revista IBRACON de Estruturas e Materiais |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952018000200331&tlng=pt |
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| author | A. D. PIASSI J. V. DIAS A. F. G. CALENZANI F. C. C. MENANDRO |
| author_facet | A. D. PIASSI J. V. DIAS A. F. G. CALENZANI F. C. C. MENANDRO |
| author_sort | A. D. PIASSI |
| collection | DOAJ |
| description | Abstract In the region of negative bending moments of continuous and semi-continuous steel and concrete composite beams, the inferior portion of the steel section is subjected to compression while the top flange is restricted by the slab, which may cause a global instability limit state know as lateral distortional buckling (LDB) characterized by a lateral displacement and rotation of the bottom flange with a distortion of the section’s web when it doesn’t have enough flexural rigidity. The ABNT NBR 8800:2008 provides an approximate procedure for the verification of this limit state, in which the resistant moment to LDB is obtained from the elastic critical moment in the negative moment region. One of the essential parameters for the evaluation of the critical moment is the composite beam’s rotational rigidity. This procedure is restricted only to to steel and concrete composite beams with sections that have plane webs. In this paper, an equation for the calculation of the rotational rigidity of cellular sections was developed in order to determine the LDB elastic critical moment. The formulation was verified by numerical analyses performed in ANSYS and its efficiency was confirmed. Finally, the procedure described in ABNT NBR 8800:2008 for the calculation of the critical LDB moment was expanded to composite beams with cellular sections in a numerical example with the appropriate modifications in geometric properties and rotational rigidity. |
| first_indexed | 2024-12-21T00:26:50Z |
| format | Article |
| id | doaj.art-53c5238f10a345539b607b9baeced077 |
| institution | Directory Open Access Journal |
| issn | 1983-4195 |
| language | English |
| last_indexed | 2024-12-21T00:26:50Z |
| publishDate | 2018-04-01 |
| publisher | Instituto Brasileiro do Concreto (IBRACON) |
| record_format | Article |
| series | Revista IBRACON de Estruturas e Materiais |
| spelling | doaj.art-53c5238f10a345539b607b9baeced0772022-12-21T19:21:58ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-41952018-04-0111233135610.1590/s1983-41952018000200007Lateral distortional buckling of cellular composite-beamsA. D. PIASSIJ. V. DIASA. F. G. CALENZANIF. C. C. MENANDROAbstract In the region of negative bending moments of continuous and semi-continuous steel and concrete composite beams, the inferior portion of the steel section is subjected to compression while the top flange is restricted by the slab, which may cause a global instability limit state know as lateral distortional buckling (LDB) characterized by a lateral displacement and rotation of the bottom flange with a distortion of the section’s web when it doesn’t have enough flexural rigidity. The ABNT NBR 8800:2008 provides an approximate procedure for the verification of this limit state, in which the resistant moment to LDB is obtained from the elastic critical moment in the negative moment region. One of the essential parameters for the evaluation of the critical moment is the composite beam’s rotational rigidity. This procedure is restricted only to to steel and concrete composite beams with sections that have plane webs. In this paper, an equation for the calculation of the rotational rigidity of cellular sections was developed in order to determine the LDB elastic critical moment. The formulation was verified by numerical analyses performed in ANSYS and its efficiency was confirmed. Finally, the procedure described in ABNT NBR 8800:2008 for the calculation of the critical LDB moment was expanded to composite beams with cellular sections in a numerical example with the appropriate modifications in geometric properties and rotational rigidity.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952018000200331&tlng=ptcellular profilerotational stiffnesslateral distortional bucklingelastic critical moment |
| spellingShingle | A. D. PIASSI J. V. DIAS A. F. G. CALENZANI F. C. C. MENANDRO Lateral distortional buckling of cellular composite-beams Revista IBRACON de Estruturas e Materiais cellular profile rotational stiffness lateral distortional buckling elastic critical moment |
| title | Lateral distortional buckling of cellular composite-beams |
| title_full | Lateral distortional buckling of cellular composite-beams |
| title_fullStr | Lateral distortional buckling of cellular composite-beams |
| title_full_unstemmed | Lateral distortional buckling of cellular composite-beams |
| title_short | Lateral distortional buckling of cellular composite-beams |
| title_sort | lateral distortional buckling of cellular composite beams |
| topic | cellular profile rotational stiffness lateral distortional buckling elastic critical moment |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952018000200331&tlng=pt |
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