تجزیه کمانش تیرهای جدار نازک تحت فشار اختیاری با شرایط مرزی عمومی
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تجزیه کمانش تیرهای جدار نازک تحت فشار اختیاری با شرایط مرزی عمومی

عنوان فارسی مقاله: تجزیه و تحلیل کمانش تیرهای جدار نازک تحت فشار اختیاری با شرایط مرزی عمومی با استفاده از تئوری تیرهای مرتبه بالاتر
عنوان انگلیسی مقاله: Buckling analysis of thin-walled box beams under arbitrary loads with general boundary conditions using higher-order beam theory
مجله/کنفرانس: مجله علوم مکانیک و فناوری - Journal of Mechanical Science and Technology
رشته های تحصیلی مرتبط: مکانیک
گرایش های تحصیلی مرتبط: طراحی کاربردی، ساخت و تولید
کلمات کلیدی فارسی: رفتار کمانش، تغییر شکل مقطعی، حالت کمانش موضعی/عمومی، نظریه تیرهای مرتبه بالاتر (HoBT)، تیرهای جدار نازک
کلمات کلیدی انگلیسی: Buckling behavior، Cross-sectional deformation، Global/local buckling mode، Higher-order beam theory (HoBT)، Thin-walled box beam
نمایه: Scopus - Master journals - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1007/s12206-019-0430-y
دانشگاه: WCU Multiscale Mechanical Design Division, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
ناشر: اسپرینگر - Springer
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 1/482 در سال 2018
شاخص H_index: 40 در سال 2019
شاخص SJR: 0/576 در سال 2018
شناسه ISSN: 1738-494X
شاخص Quartile (چارک): Q2 در سال 2018
فرمت مقاله انگلیسی: pdf
تعداد صفحات مقاله انگلیسی: 17
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E13071
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Employed higher-order beam theory (HoBT)


3- Buckling analysis based on HoBT


4- Finite element formulation


5- Numerical examples


6- Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


When a higher-order or generalized beam theory is used for the buckling analysis of thin-walled beams, the analysis accuracy critically depends on the number and shapes of the cross-sectional modes associated with warping and distortion. In the study, we propose to use the hierarchically-derived cross-sectional modes consistent with the higher-order beam theory for the analysis of pre-buckling stress and buckling load. The proposed formulation is applicable to any box beams subjected to arbitrary loads and general boundary conditions. We demonstrate the effectiveness of the proposed method by performing buckling analyses for axial, bending, torsional, and general loadings. Length-to-height ratios of the beams are also varied from 1 to 100. If up to fifty cross-sectional and rigid-body modes are employed, the calculated buckling loads are found to match favorably those predicted by the shell finite element analysis. In that a unified buckling analysis under general loads is developed for box beams, the present study is expected to contribute towards new possibilities for the efficient buckling analysis of more general box beam structures involving several joints.


Introduction


In contrast to solid beams, thin-walled beams involve global and local buckling modes when they buckle. Local modes involve localized cross-sectional deformations at several points along the beam axis. Specifically, these modes stem from the buckling of the wall plates of a thin-walled beam. A dominant deformation pattern in local modes is distortion, i.e., a sectional in-plane deformation. Cross-sectional deformations of box beams are developed even in global buckling, and thus the classical Euler or Timoshenko beam theories cannot accurately predict the buckling loads and modes of thin-walled beams. The accuracy by these classical beam theories becomes worse especially when the box beams are not long. In the case when a box beam is shorter than a certain length, a local buckling mode appears as the primary buckling mode because the buckling of wall plates forming a box beam is dominant. Prior to proposing a method to accurately predict the buckling phenomenon of thin-walled box beams with a higher-order beam theory, we will review related extant investigations to validate the need for an alternative approach as discussed in the study. If a thin-walled box beam is viewed as a plate structure, a discrete plate model can be employed as in Refs. [1-3]. In the aforementioned studies, a thin-walled beam is considered as an assembly of thin plates having various boundary conditions. Typically, different boundary conditions are considered based on loading and bonding conditions between the wall plates of a box beam. Because they used a plate theory, the analysis was more complicated than that using a (higher-order) beam theory. The finite strip methods were proposed by Refs. [4-8], in which the distortional deformations of the beam section were taken into account. Methods mainly considering warping were also proposed [9-12]. In these methods, nodal displacements at each corner were used as the beam degrees of freedom (DOFs) to describe warping deformation.

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