TY - JOUR
T1 - Geometric Imperfection Measurements and Validations on Cold-Formed Steel Channels Using 3D Noncontact Laser Scanner
AU - Selvaraj, Sivaganesh
AU - Madhavan, Mahendrakumar
N1 - Funding Information:
The investigation reported in this paper was funded by Science Engineering and Research Board (SERB) Research Grant (SB/ S3/CEE/046/2014), Department of Science and Technology (DST), Government of India. In particular, the authors would like to acknowledge the support offered by Milind Kulkarni, Scientist G, SERB, and V. Kalyanaraman, Emeritus Professor at IIT Madras. The authors would also like to thank N.E. Shanmugam, formerly with National University of Singapore, and James S. Davidson, Auburn University, for their critical comments on the manuscript.
Publisher Copyright:
© 2018 American Society of Civil Engineers.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - A three-dimensional (3D) noncontact laser-scanning method to quantify the deviations in cold-formed steel (CFS) channel sections (plain and lipped) is presented. The methodologies to segregate the different categories of imperfections from the deviations in the geometry of CFS member are also presented. A total of 24 different C-sections (minimum of six samples in each section) with varying cross-sectional parameters totaling 188 specimens were studied. The nature of imperfections in the CFS members was found to correlate with geometric properties such as slenderness ratios, torsional constant, and plate slenderness. The bow and camber imperfection (global out-of-straightness) in the members is presented with respect to the minor and major axis slenderness ratios. A new combined global and cross-sectional parameter (J/L) is introduced against the deviation caused by twisting of the CFS member. To predict the imperfection magnitudes based on their geometrical properties, a new set of expressions are suggested.
AB - A three-dimensional (3D) noncontact laser-scanning method to quantify the deviations in cold-formed steel (CFS) channel sections (plain and lipped) is presented. The methodologies to segregate the different categories of imperfections from the deviations in the geometry of CFS member are also presented. A total of 24 different C-sections (minimum of six samples in each section) with varying cross-sectional parameters totaling 188 specimens were studied. The nature of imperfections in the CFS members was found to correlate with geometric properties such as slenderness ratios, torsional constant, and plate slenderness. The bow and camber imperfection (global out-of-straightness) in the members is presented with respect to the minor and major axis slenderness ratios. A new combined global and cross-sectional parameter (J/L) is introduced against the deviation caused by twisting of the CFS member. To predict the imperfection magnitudes based on their geometrical properties, a new set of expressions are suggested.
KW - 3D non-contact laser scan
KW - Cold-formed steel
KW - Geometric imperfections
KW - Imperfection magnitude predictions
UR - http://www.scopus.com/inward/record.url?scp=85042003127&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)ST.1943-541X.0001993
DO - 10.1061/(ASCE)ST.1943-541X.0001993
M3 - Journal article
AN - SCOPUS:85042003127
SN - 0733-9445
VL - 144
JO - Journal of Structural Engineering (United States)
JF - Journal of Structural Engineering (United States)
IS - 3
M1 - 04018010
ER -