NUMERICAL ANALYSIS OF TRUSS SYSTEMS WITH STIFFENED FLATTENED END-BARS

  • ANA AMELIA OLIVEIRA MAZON Federal University of São João del-Rei
  • ARLENE MARIA SARMANHO FEDERAL UNIVERSITY OF OURO PRETO
  • GABRIEL VIEIRA NUNES Federal Institute Minas Gerais
  • LUCAS ROQUETE Federal University of São João del-Rei
  • LUIZ HENRIQUE NEIVA Federal University of Ouro Preto
  • FLÁVIO TEIXEIRA DE SOUZA Federal Institute Minas Gerais
Keywords: STEEL STRUCTURES, PLANE TRUSSES, NUMERICAL ANALYSIS, CIRCULAR HOLLOW SECTIONS

Abstract

CIRCULAR HOLLOW SECTIONS ARE USUALLY USED IN LONG-SPAN ROOF TRUSS SYSTEMS. ONE OF THE TYPOLOGY FOR CONNECTING ELEMENTS IN SUCH STRUC-TURES INVOLVES THE FLATTENING OF BAR ENDS. THIS ARTICLE PRESENTS THE NUMERICAL ANALYSIS OF A PLANE TRUSS COMPOSED OF CIRCULAR HOLLOW SECTIONS, IN WHICH DIAGONAL BARS HAVE FLATTENED ENDS. IN THIS SENSE, A NEW FLATTENING TYPOLOGY CALLED STIFFENED FLATTENING IS PROPOSED, CHARACTERIZED BY A NON-FLAT GEOMETRY, WITH THE CREATION OF STIFFENERS IN THE LATERAL EDGES OF THE DIAGONAL FLATTENED ENDS. THE DIAGONAL CONNECTING SYSTEM WITH THE CHORD MEMBERS USES CONNECTING PLATES. THE PLATES ARE WELDED TO THE CHORDS AND THE DIAGONALS ARE CONNECTED TO LATTER THROUGH A SINGLE BOLT. THE NUMERICAL ANALYSIS USING FINITE ELEMENTS METHOD WAS DEVELOPED IN TWO STAGES THROUGH ANSYS SOFTWARE WITH THE PARAMETRIC DESIGN LANGUAGE (APDL), IN WHICH PARAMETERS SUCH AS GEOMETRY, MATERIALS, ELEMENT TYPES, BOUNDARY CONDITIONS AND LOADS ARE SPECIFIED. A NON-LINEAR ANALYSIS WAS PERFORMED USING SHELL ELEMENTS ON THE CHORDS, DIAGONALS, PLATES AND WELDS, AND CONTACT ELEMENTS BETWEEN THE DIAGONALS WITH STIFFENED FLATTENED ENDS AND THE CONNECTING PLATES. INITIALLY, A NUMERICAL STUDY OF THE CONNECTING NODE AND THE STIFFENED FLATTENED END WAS PERFORMED, AND THE RESULTS DIRECTED THE MODELING OF THE PLANE TRUSS. THE NUMERICAL RESULTS WERE CALIBRATED WITH THE EXPERIMENTAL TRUSS RESULTS IN FULL SCALE. THE NUMERICAL RESULT OF THE PLANE TRUSS WAS ALSO COMPARED TO A THEORETICAL STUDY, CONSIDERING THE AXIAL LOAD ECCENTRICITY APPLIED IN THE DIAGONAL WITH STIFFENED FLATTENED ENDS. THE STUDY WAS BASED ON THE CONSIDERATION OF COMBINED EFFECTS OF AXIAL FORCE AND BENDING MOMENT PROVIDED BY THE BRAZILIAN STANDARD ABNT NBR 8800:2008. THE FINAL RESULTS INDICATE THAT THE NUMERICAL MODEL PROPOSED IS EFFICIENT AND HAS GOOD CORRELATION WITH THE EXPERIMENTAL AND THEORETICAL RESULTS.

Author Biographies

ANA AMELIA OLIVEIRA MAZON, Federal University of São João del-Rei

Associate Professor, Department of Technology in Civil Engeneering, Computer Science & Humanities

ARLENE MARIA SARMANHO, FEDERAL UNIVERSITY OF OURO PRETO

Associate Professor, Civil Department

GABRIEL VIEIRA NUNES, Federal Institute Minas Gerais

Assistant Professor, Department of Building, Federal Institute Minas Gerais

LUCAS ROQUETE, Federal University of São João del-Rei

Assistant Professor, Department of Technology in Civil Engeneering, Computer Science & Humanities, 

LUIZ HENRIQUE NEIVA, Federal University of Ouro Preto

Civil Engineering, Department of Civil Engineering, Federal University of Ouro Preto

FLÁVIO TEIXEIRA DE SOUZA, Federal Institute Minas Gerais

Associate Professor, Department of Building, Federal Institute Minas Gerais

Published
2018-02-05
Section
Articles