Addis Ababa University Addis Ababa Institute of Technology School of Civil and Environmental Engineering STUDY ON FLEXURAL BUCKLING CURVES FOR HOT FINISHED HOLLOW SECTIONS By Temesgen Abiy Advisor: Dr. Shifferaw Taye Sponsor: Ethiopian Roads Authority (ERA) March 2018 A thesis submitted to the School of Graduate Studies of Addis Ababa University in partial fulfillment of the requirements for the degree of Master of Science in Structural Engineering