Effects of different types of corrosion on seismic performance of circular hollow section T-joints subjected to coupling load

IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL
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Abstract

The purpose of this paper is to investigate the effects of different types of corrosion on seismic performances of circular hollow section (CHS) T-joints subjected to in-plane cyclic load. Firstly, the validity of a numerical modeling method introducing the actual corrosion morphological characteristics was verified by comparing with experimental results. Subsequently, the influences of different corrosion characteristic parameters (corrosion types, corrosion position and corrosion level) on the hysteresis behaviors of CHS T-joints under the cyclic bending load were discussed in detail, and the analysis results indicated: 1) compared with the pitting damage, the degradation behavior of CHS T-joints with the equivalent uniform corrosion was closer to that of the CHS T-joints with the actual corrosion morphology; 2) the degradation level of cyclic bearing capacities of CHS T-joints with the general corrosion was higher than that of CHS T-joints with brace or chord corrosion under the same condition; 3) the increase in dimension of the single pit had little influence on affecting the hysteresis behavior of CHS T-joints, the bearing capacities and energy dissipation of CHS T-joints significantly decreased with the increasing distribution density of pits, even leading to the change of failure mode of CHS T-joint under cyclic bending load; 4) when the volume loss of different types of corrosion was similar, the higher the local corrosion damage, the more serious the seismic performance degradation of CHS T-joints. When the volume loss caused by different types of corrosion was transferred to the thickness loss, the ultimate capacities of corroded CHS T-joints could be calculated by applying the existing formulas. However, the calculation value was lower than the numerical results due to overestimating the adverse effects of corrosion on the axial bearing capacity of CHS T-joints.
不同类型的腐蚀对承受耦合载荷的圆形空心截面 T 型接头抗震性能的影响
本文旨在研究不同类型的腐蚀对承受面内循环载荷的圆形空心截面(CHS)T 型接头抗震性能的影响。首先,通过与实验结果比较,验证了引入实际腐蚀形态特征的数值建模方法的有效性。随后,详细讨论了不同腐蚀特征参数(腐蚀类型、腐蚀位置和腐蚀程度)对循环弯曲载荷下 CHS T 型接头滞后行为的影响,分析结果表明1)与点蚀破坏相比,等效均匀腐蚀的 CHS T 型接头的退化行为更接近于实际腐蚀形态的 CHS T 型接头;2)在相同条件下,一般腐蚀的 CHS T 型接头的循环承载力退化程度高于支撑或弦腐蚀的 CHS T 型接头;3)单个凹坑尺寸的增大对 CHS T 型接头的滞回行为影响不大,随着凹坑分布密度的增大,CHS T 型接头的承载力和耗能明显降低,甚至导致循环弯曲荷载作用下 CHS T 型接头破坏模式的改变;4)当不同类型腐蚀造成的体积损失相近时,局部腐蚀破坏程度越高,CHS T 型接头的抗震性能退化越严重。当不同类型腐蚀造成的体积损失转移到厚度损失时,可以通过应用现有公式计算出腐蚀 CHS T 型接头的极限承载力。然而,由于高估了腐蚀对 CHS T 型接头轴向承载能力的不利影响,计算值低于数值结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.30
自引率
13.30%
发文量
208
审稿时长
17 months
期刊介绍: Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.
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