Parametric study on the assessment of the local buckling behavior of perforated square hollow sections with non-uniform wall thickness under axial compression

Öz

The aim of this rigorous parametric study is to explore the influence of perforations on the local buckling behavior of square hollow sections (SHSs) possessing non-uniform wall thickness. A finite element procedure followed in the current study has been first validated against existing test results documented for the local buckling behavior of the perforated SHS with uniform web and flange segment thickness under axial compression. The linear elastic eigenvalue buckling and elastoplastic buckling analyses have been implemented using the Abaqus engineering finite element code. The verification of the numerical procedure has been achieved by favorably comparing the finite element results with the existing test results in terms of the first local buckling mode shape and load-end shortening curves of the perforated SHS with uniform wall thickness. . The verified numerical procedure has been applied to the problem of finding the perforation effect on the local buckling response of the SHS with non-uniform thickness. Finite element analyses have been performed for four various web width-to-perforation diameter ratios ranging from 0.3 to 0.9. Finite element analysis results have revealed that the presence of perforations does not influence the local buckling mode shape of the SHS but considerably affects the critical local buckling loads. The results have put forth that increasing perforation diameter leads to a more pronounced and drastic decrease in the critical local buckling load. The outcomes of the study have also shown that the critical post-buckling load of the SHS with non-uniform wall thickness is less susceptible to perforations compared to the SHS with uniform wall thickness. The results obtained in the context of this parametric study have been made available to practical engineering for use in actual design of the perforated SHSs.

Anahtar Kelimeler

• Local Stability
• Square Hollow Section (SHS)
• Circular Web Openings
• Perforations
• Axial Compression
• Local Buckling Coefficients
• Finite Element Analysis

Düzgün olmayan duvar kalınlığına sahip delikli kare içi boş profillerin eksenel basınç altında yerel burkulma davranışının değerlendirilmesi üzerine parametrik çalışma

Öz

Bu titiz parametrik çalışmanın amacı, düzgün olmayan duvar kalınlığına sahip kare içi boş bölümlerin (SHS'ler) yerel burkulma davranışı üzerindeki deliklerin etkisini araştırmaktır. Mevcut çalışmada izlenen sonlu elemanlar prosedürü ilk olarak eksenel basınç altında düzgün yan duvar ve flanş kalınlığına sahip delikli SHS'nin yerel burkulma davranışı için belgelenen mevcut test sonuçlarına göre doğrulanmıştır. Doğrusal elastik özdeğer burkulması ve elastoplastik burkulma analizleri Abaqus mühendislik sonlu elemanlar kodu kullanılarak uygulanmıştır. Sayısal prosedürün doğrulanması, sonlu eleman sonuçlarının, tekdüze duvar kalınlığına sahip delikli SHS'nin ilk yerel burkulma modu şekli ve yük-deformasyon eğrileri açısından mevcut test sonuçlarıyla olumlu bir şekilde karşılaştırılması yoluyla elde edilmiştir. Doğrulanmış sayısal prosedür, düzgün olmayan kalınlıktaki SHS'nin yerel burkulma tepkisi üzerindeki delik etkisini bulma problemine uygulanmıştır. Sonlu eleman analizleri, 0.3 ile 0.9 arasında değişen dört farklı yan duvar genişliği/delik çapı oranı için gerçekleştirilmiştir. Sonlu eleman analizi sonuçları, deliklerin varlığının SHS'nin yerel burkulma modu şeklini etkilemediğini ancak kritik yerel burkulma yüklerini önemli ölçüde etkilediğini ortaya çıkarmıştır. Sonuçlar, delik çapının arttırılmasının, kritik yerel burkulma yükünde daha belirgin ve ciddi bir azalmaya yol açtığını ortaya koymuştur. Çalışmanın sonuçları ayrıca, eşit olmayan duvar kalınlığına sahip SHS'nin kritik burkulma sonrası yükünün, eşit duvar kalınlığına sahip SHS'ye kıyasla deliklere karşı daha az duyarlı olduğunu göstermiştir. Bu parametrik çalışma kapsamında elde edilen sonuçlar, delikli SHS'lerin gerçek tasarımında kullanılmak üzere pratik mühendisliğe sunulmuştur.

Anahtar Kelimeler

• Yerel Stabilite
• Kare kutu kesit
• Dairesel delik
• Dairesel boşluk
• Eksenel basma
• Yerel burkulma katsayısı
• Sonlu elemanlar analizi

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