Experimental investigation of the overall buckling behaviour of 960 MPa high strength steel columns |
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| Affiliation: | 1. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China;2. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia;1. Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China;2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;1. College of Civil Engineering, Tongji University, Shanghai, China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Dept. of Architecture & Architectural Engineering, Seoul National University, Seoul 151-742, Republic of Korea;2. Dept. of Building Structure and Materials Research, Steel Structure Research Division, RIST, Incheon 406-840, Republic of Korea;3. Korea Railroad Research Institute, Uiwang 437-757, Republic of Korea;1. College of Civil Engineering, Tongji University, Shanghai, China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education, Chongqing 400045, China;2. School of Civil Engineering, Chongqing University, Chongqing 400045, China;3. School of Civil, Environmental & Mining Engineering, University of Western Australia, Australia |
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| Abstract: | Investigations of the mechanical performance of high strength steel structures have become a research hotspot in civil and structural engineering, and existing experimental studies of their overall buckling behaviour have hitherto focused mainly on columns fabricated from either 460 MPa or 690 MPa steels. The present study describes an experimental programme including six pin-ended 960 MPa steel columns under axial compression. Both welded I- and box-section specimens are considered. The initial geometric imperfections and cross-sectional residual stresses are reported, with the axial loading, deformation and the strain distributions at the mid-length section being monitored during the testing. The buckling mode is clarified, and the buckling capacity is compared with design results according to current national design codes. Based on the experimental results, a finite element model is described and validated, and then used to perform a large number of parametric studies, considering different cross-sectional dimensions and column slendernesses. It is found that all specimens failed by overall flexural buckling, and the corresponding column curves in current design codes underestimate the dimensionless buckling strength of 960 MPa steel columns. Higher and more adequate column curves are suggested for such columns, and new column curves are proposed based on a non-linear fitting of the parametric results. |
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