University of Qom Civil Infrastructure Researches 2783-140X 10 2 2024 12 21 A Parametric Study on the Bending Capacity of Dented Hollow Circular Section A Parametric Study on the Bending Capacity of Dented Hollow Circular Section 147 161 3127 10.22091/cer.2024.11423.1578 FA Vahid Akrami Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran. 0000-0002-1464-2683 Nazanin Mazloumi Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran. 0009-0009-0338-5042 Hamed Rahman Shokrgozar Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran. 0000-0003-1521-7934 Journal Article 2024 10 03 Thin-walled steel Circular Hollow Sections (CHS) are widely used in various structures and are subjected to different loads and various types of damages. Previous research has primarily focused on the axial capacity of these sections. This paper provides a numerical study on the bending capacity of damaged CHS sections and the effects of various factors, including damage severity, bending moment angle, and wall slenderness ratio. Modeling for this study was conducted using Abaqus software, and results were validated against previous experimental data. The findings indicate that damage severity and the wall slenderness ratio are the two main parameters affecting the ultimate capacity of the damaged CHS. As these parameters increase, the ultimate capacity of the section significantly decreases. For a damage depth equal to 20% of the section diameter, the reduction in bending capacity varies from 20% for a slenderness ratio of 33.3 to over 36% for a slenderness ratio of 125. This reduction maximizes when damage is located on the compressive face of the cylinder. It was also observed that the length of the member and the location of the damage along it have a negligible effect on the bending capacity. Finally, a relation is provided to estimate the reduction of bending strength due to damage, and is compared with numerical results. This relation is applicable for CHS section with wall-slenderness ratios between 33.3 and 125, length-to-diameter ratios of 4 to 6, damage depth ratios of 0 to 0.2, and bending moment angles of 0 to 90 degrees. Thin-walled steel Circular Hollow Sections (CHS) are widely used in various structures and are subjected to different loads and various types of damages. Previous research has primarily focused on the axial capacity of these sections. This paper provides a numerical study on the bending capacity of damaged CHS sections and the effects of various factors, including damage severity, bending moment angle, and wall slenderness ratio. Modeling for this study was conducted using Abaqus software, and results were validated against previous experimental data. The findings indicate that damage severity and the wall slenderness ratio are the two main parameters affecting the ultimate capacity of the damaged CHS. As these parameters increase, the ultimate capacity of the section significantly decreases. For a damage depth equal to 20% of the section diameter, the reduction in bending capacity varies from 20% for a slenderness ratio of 33.3 to over 36% for a slenderness ratio of 125. This reduction maximizes when damage is located on the compressive face of the cylinder. It was also observed that the length of the member and the location of the damage along it have a negligible effect on the bending capacity. Finally, a relation is provided to estimate the reduction of bending strength due to damage, and is compared with numerical results. This relation is applicable for CHS section with wall-slenderness ratios between 33.3 and 125, length-to-diameter ratios of 4 to 6, damage depth ratios of 0 to 0.2, and bending moment angles of 0 to 90 degrees. https://cer.qom.ac.ir/article_3127_61384821e091cf1e24b3266a77734238.pdf