Journal of Hebei University of Science and Technology (Feb 2022)
Research on bending-torsional behaviors of steel-concrete composite beam with corrugated steel webs
Abstract
To further reveal the cracking mechanism and the bending-torsional failure mode caused by the bending-torsional behaviors of the steel-concrete composite beam with corrugated steel webs,model experiments were conducted on five test beams under the combined bending-torsional load.Combined with ANSYS finite element analysis,reduction factors for both the cracking bending moment and torsional moment were proposed,and the bending-torsional correlation formula between the ultimate bending moment and torsional moment was suggested.The results show that,with the increase of the ratio of bending moment,the cracking torsional moment increases,while the cracking bending moment and the angle between the inclined crack and the longitudinal axis decrease gradually;the failure mode is changed from bending failure of normal section to torsional failure which is characterized by a main inclined crack and the inclined compressed concrete column reaching to the ultimate strain.When the torsional bending ratio k≤[BF]0.15[BFQ],the torsional moment has little influence on the ultimate bending moment;when k≥[BF]0.6[BFQ],the bending moment has little influence on the ultimate torsional moment;when [BF]0.15[BFQ]<k<[BF]0.6[BFQ],both the ultimate bending moment and the torsional moment are reduced apparently by the combined bending-torsional effect with a monotone decreasing linear correlation.The experimental study can reveal the interaction between the bending and torsional properties of composite beams with corrugated steel webs in a certain range of k,which reveals the cracking mechanism and bending torsion failure mode of concrete slabs under bending and torsion,provides some reference for the study of the bending and torsional properties of composite beams with corrugated steel webs in other range of k.[HQ]
