Biaxial bending of slender HSC columns and tubes filled with concrete under short- and long-term loads: I) Theory

摘要: An analytical method that calculates both the short- and long-term response of slender columns made high-strength concrete (HSC) tubes filled with generalized end conditions subjected to transverse loads along span axial load at ends (causing a single or double curvature under uniaxial biaxial bending) is presented. The proposed method, which an extension previously developed by authors, capable predicting not only complete load-rotation load-deflection curves (both ascending descending parts) but also maximum capacity. can be analyzed include solid hollow (rectangular, circular, oval, C-, T-, L-, any arbitrary shape) cross sections circular rectangular steel HSC. fiber used calculate moment-curvature diagrams different levels applied (i.e., M-P-φ curves), Gauss integration (for sum contributions fibers parallel neutral axis) lateral rotations deflections column span. Long-term effects, such as creep shrinkage concrete, are included. However, effects shear deformations torsion member validity presented in companion paper compared against experimental results for over seventy specimens reported technical literature researchers.