بررسی پارامتریک ظرفیت خمشی مقطع توخالی مدور آسیب‌دیده

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران.

10.22091/cer.2024.11423.1578

چکیده

مقاطع توخالی مدور (CHS) جدار نازک فولادی به دلیل کاربرد گسترده در سازه‌های مختلف، در معرض بارهای مختلف و آسیب‌های گوناگون قرار دارند. تحقیقات پیشین عمدتا بر بررسی ظرفیت محوری این مقاطع متمرکز می‌باشد. این مقاله به بررسی ظرفیت خمشی مقطع CHS آسیب‌دیده و تأثیر عوامل مختلفی از جمله شدت آسیب، زاویه بارگذاری خمشی و لاغری جداره به روش عددی می‌پردازد. مدل‌سازی‌های تحقیق با استفاده از نرم‌افزار آباکوس و صحت‌سنجی نتایج با داده‌های تجربی قبلی انجام شده است. نتایج نشان می‌دهند که شدت آسیب و نسبت لاغری جداره دو پارامتر اصلی تأثیرگذار بر ظرفیت نهایی پوسته استوانه‌ای آسیب‌دیده می‌باشند. با افزایش این دو پارامتر، ظرفیت نهایی مقطع به طور قابل‌توجهی کاهش می‌یابد. برای عمق آسیب برابر با 20% قطر مقطع، مقدار کاهش ظرفیت خمشی از 20% برای مقطع با لاغری جداره 33.3 تا بیش از 36% برای مقطع با لاغری جداره 125 متغیر می‌باشد. آسیب وارده زمانی بیشترین تأثیر کاهنده خود را دارد که در وجه فشاری استوانه قرار گیرد. همچنین ملاحظه شد که طول عضو و محل آسیب در طول آن تأثیر ناچیزی بر ظرفیت خمشی نمونه‌ دارد. نهایتا رابطه‌ای برای برآورد کاهش مقاومت خمشی ناشی از بروز آسیب در این اعضا ارائه و با نتایج تحلیل‌های عددی مقایسه شده است. این رابطه برای مقطع CHS با لاغری جداره بین 33.3 تا 125، نسبت طول به قطر 4 تا 6، نسبت عمق آسیب صفر تا 0.2 و زاویه بارگذاری خمشی صفر تا 90 درجه قابل استفاده می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Parametric Study on the Bending Capacity of Dented Hollow Circular Section

نویسندگان [English]

  • Vahid Akrami
  • Nazanin Mazloumi
  • Hamed Rahman Shokrgozar
Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده [English]

Thin-walled steel Circular Hollow Sections (CHS) are widely used in various structures and are subjected to different loads and various types of damages. Previous research has primarily focused on the axial capacity of these sections. This paper provides a numerical study on the bending capacity of damaged CHS sections and the effects of various factors, including damage severity, bending moment angle, and wall slenderness ratio. Modeling for this study was conducted using Abaqus software, and results were validated against previous experimental data. The findings indicate that damage severity and the wall slenderness ratio are the two main parameters affecting the ultimate capacity of the damaged CHS. As these parameters increase, the ultimate capacity of the section significantly decreases. For a damage depth equal to 20% of the section diameter, the reduction in bending capacity varies from 20% for a slenderness ratio of 33.3 to over 36% for a slenderness ratio of 125. This reduction maximizes when damage is located on the compressive face of the cylinder. It was also observed that the length of the member and the location of the damage along it have a negligible effect on the bending capacity. Finally, a relation is provided to estimate the reduction of bending strength due to damage, and is compared with numerical results. This relation is applicable for CHS section with wall-slenderness ratios between 33.3 and 125, length-to-diameter ratios of 4 to 6, damage depth ratios of 0 to 0.2, and bending moment angles of 0 to 90 degrees.

کلیدواژه‌ها [English]

  • Circular Hollow Sec-tions (CHS)
  • Bending Capacity
  • Damage Severity
  • Wall slenderness ratio
  • Finite Element Analysis

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