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Residual stress and compression buckling of large welded equal-leg steel angles
Abstract In recent years, the use of large angle columns increased in response to the booming constructions of ultra-high-voltage (UHV) transmission towers. Although steel column stability had been studied extensively, fundamental researches on large welded angles were insufficient; the compression buckling strengths of such angles before and after galvanization were unclear. Therefore, this paper measured the residual stresses of welded L300 × 30 and L300 × 20 sections with the sectioning method. There were six non-galvanized and six galvanized specimens. It was found that hot-dip galvanization followed by immediate water cooling altered the residual stresses greatly. Based on the test data, two types of residual stress distribution models were proposed: one was for the non-galvanized welded angles and the other was for the galvanized ones. Next, finite element analyses using ABAQUS were conducted to study the influences of geometric imperfections, galvanization and through-thickness stress variations on the buckling strengths of welded angle columns. Finally, buckling strengths covering a wide range of slenderness ratios were calculated, forming the buckling curves of the large welded equal-leg angles. These curves were then compared with the existing Chinese, European and American design codes. The column design recommendations for the large welded equal-leg angles were given: it was suggested to use GB 50017 curve a, EC3 curve a0, or ASCE 10 curve with λ x,n ≤ 1 to design such angle columns.
Highlights Measure the residual stresses of L300 large welded equal-leg steel angles. Propose stress distribution models based on the residual stress measurements. Analyze effects of initial imperfections and galvanization on compression buckling strengths with FEMs. Recommend selections of design column curves based on Chinese, European and American design codes.
Residual stress and compression buckling of large welded equal-leg steel angles
Abstract In recent years, the use of large angle columns increased in response to the booming constructions of ultra-high-voltage (UHV) transmission towers. Although steel column stability had been studied extensively, fundamental researches on large welded angles were insufficient; the compression buckling strengths of such angles before and after galvanization were unclear. Therefore, this paper measured the residual stresses of welded L300 × 30 and L300 × 20 sections with the sectioning method. There were six non-galvanized and six galvanized specimens. It was found that hot-dip galvanization followed by immediate water cooling altered the residual stresses greatly. Based on the test data, two types of residual stress distribution models were proposed: one was for the non-galvanized welded angles and the other was for the galvanized ones. Next, finite element analyses using ABAQUS were conducted to study the influences of geometric imperfections, galvanization and through-thickness stress variations on the buckling strengths of welded angle columns. Finally, buckling strengths covering a wide range of slenderness ratios were calculated, forming the buckling curves of the large welded equal-leg angles. These curves were then compared with the existing Chinese, European and American design codes. The column design recommendations for the large welded equal-leg angles were given: it was suggested to use GB 50017 curve a, EC3 curve a0, or ASCE 10 curve with λ x,n ≤ 1 to design such angle columns.
Highlights Measure the residual stresses of L300 large welded equal-leg steel angles. Propose stress distribution models based on the residual stress measurements. Analyze effects of initial imperfections and galvanization on compression buckling strengths with FEMs. Recommend selections of design column curves based on Chinese, European and American design codes.
Residual stress and compression buckling of large welded equal-leg steel angles
Chou, An-Ping (Autor:in) / Shi, Gang (Autor:in) / Liu, Chenhao (Autor:in) / Zhou, Le (Autor:in)
24.12.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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