Influence of Boundary Conditions on the Critical and Failure Load in the GFPR Channel Cross-Section Columns Subjected to Compression

The paper deals with experimental investigation and numerical analysis on influence of boundary conditions on critical load, post-buckling behaviour and failure load of compressed composite channel-section columns. The columns were made of 8-ply glass–epoxy laminate. The six different layers arrangement were considered. Tests were conducted using two test stands. In the first of them, special self-aligning grips with spherical bearings were used. In the second stand contains a stiff plate and a table. The stiff plate was mounted to the upper jaw and has only one degree of freedom (vertical movement). The table with spherical bearing which is mounted in the bottom jaw has 3 DOF (rotations about three perpendicular axes). The strain-gauges technique has been used for all tested specimens. Additionally the second stand has been equipped with the ARAMIS system for non-contact 3D displacement measurements. Numerical analysis was conducted using ANSYS software. Two models were prepared with boundary conditions corresponding to test stands. The critical load values were determined using following methods: the load vs. square of strain difference P−(e1−e2)2, the load vs. strain difference P−(e1−e2) curve inflection point method. To the failure load estimation the Tsai-Wu criterion and maximum stress criterion have been applied.

[1]  Kent A. Harries,et al.  Compressive strength equation for GFRP square tube columns , 2014 .

[2]  Viorel Ungureanu,et al.  Plastic mechanisms database for thin-walled cold-formed steel members in compression and bending , 2010 .

[3]  Chiara Bisagni,et al.  Perturbation-based imperfection analysis for composite cylindrical shells buckling in compression , 2013 .

[4]  T. R. Smith.  The local buckling of box girders under bending stresses , 1969 .

[5]  T. C. Chu,et al.  Three-dimensional displacement measurements using digital image correlation and photogrammic analysis , 1990 .

[6]  H. Dębski,et al.  Experimental investigation of channel-section composite profiles’ behavior with various sequences of plies subjected to static compression , 2013 .

[7]  Nuno Silvestre,et al.  Experimental and numerical study on the structural behavior of eccentrically loaded GFRP columns , 2013 .

[8]  Geoffrey Turvey,et al.  A computational and experimental analysis of the buckling, postbuckling and initial failure of pultruded GRP columns , 2006 .

[9]  F. C. Campbell.  Manufacturing technology for aerospace structural materials , 2006 .

[10]  Christos Kassapoglou,et al.  Design and Analysis of Composite Structures: With Applications to Aerospace Structures , 2010 .

[11]  Tomasz Kubiak,et al.  Selected problems concerning determination of the buckling load of channel section beams and columns , 2015 .

[12]  Benjamin W. Schafer,et al.  Local, Distortional, and Euler Buckling of Thin-Walled Columns , 2002 .

[13]  T. Kubiak,et al.  Estimation of load-carrying capacity for thin-walled composite beams , 2015 .

[14]  H. Dębski,et al.  On buckling collapse and failure analysis of thin-walled composite lipped-channel columns subjected to uniaxial compression , 2014 .

[15]  Richard Degenhardt,et al.  Numerical characterization of imperfection sensitive composite structures , 2014 .

[16]  Gregory J. Hancock,et al.  COMPRESSION TESTS OF LONG WELDED I-SECTION COLUMNS , 1986 .

[17]  Sébastien Mistou,et al.  Global behaviour of a composite stiffened panel in buckling. Part 2: Experimental investigation , 2012 .

[18]  Teoman Peköz,et al.  Locally Buckled Thin-Walled Columns , 1984 .

[19]  John S. Tomblin,et al.  A phenomenological design equation for FRP columns with interaction between local and global buckling , 1994 .