ستونهای فولادی با مقطع توخالی تقویت شده با پرشدگی بتن تحت پیش بارگذاری
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ستونهای فولادی با مقطع توخالی تقویت شده با پرشدگی بتن تحت پیش بارگذاری

عنوان فارسی مقاله: رفتار و طراحی ستونهای فولادی با مقطع توخالی دایره ای تقویت شده با پرشدگی بتن تحت پیش بارگذاری
عنوان انگلیسی مقاله: Behaviour and design of circular hollow section steel columns strengthened by infilling concrete under preload
مجله/کنفرانس: مجله تحقیقات فولاد ساختمانی - Journal Of Constructional Steel Research
رشته های تحصیلی مرتبط: عمران
گرایش های تحصیلی مرتبط: سازه، مدیریت ساخت
کلمات کلیدی فارسی: کمانش كل، ستون هاي فولادي با مقطع توخالی دایره ای، پیش بارگذاری، بتن توپر، تقويت، روش طراحي
کلمات کلیدی انگلیسی: Overall buckling، CHS steel columns، Preload، Infilled concrete، Strengthening، Design method
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus - Master Journals List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.jcsr.2019.05.001
دانشگاه: Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3/171 در سال 2018
شاخص H_index: 81 در سال 2019
شاخص SJR: 1/719 در سال 2018
شناسه ISSN: 0143-974X
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 13
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: بله
آیا این مقاله مدل مفهومی دارد: دارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E13114
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

ABSTRACT


1- Introduction


2- Experimental programme


3- Numerical modelling


4- Proposed design method


5- Conclusions


References

نمونه متن انگلیسی مقاله

ABSTRACT


The objective of this work is to develop design guidance for existing hollow steel columns that are retrofitted by infilling concrete into the tubes. The primary challenge is the unknown effect of the existing preload on the steel columns prior to the concrete infill. Composite performance and buckling behaviour of circular hollow section (CHS) steel columns strengthened by infilling concrete under preload was experimentally and numerically investigated in this study. A total of 34 CHS steel columns were tested under pin-ended boundary conditions, and the overall buckling failure modes and corresponding ultimate buckling resistances were recorded. Prior to the member testing, material properties of the steel columns and the infilled concrete were attained. By means of the finite element (FE) software package ABAQUS, elaborate FE models for the CHS columns strengthened by infilling concrete were developed and validated against the obtained test results, which were further verified with other available test data. Using the validated FE models, systematic parametric studies were conducted to examine the influences of the major factors affecting the ultimate capacities of the CHS columns strengthened by infilling concrete, including preload ratios, steel and concrete strengths, steel ratios, initial global imperfections, eccentricity ratios and column slenderness ratios. The obtained test and numerical results were therefore utilised to develop design criteria for predicting the overall buckling resistance of CHS steel columns strengthened by infilling concrete. In view of the difficulty of determining the key parameters in practice and the uncertainty of the strengthening process, a new simplified design coefficient was proposed, taking into account the influence of the preload. It has been demonstrated that accurate and reasonable strength predictions can be provided by the proposed design method.


Introduction


Strengthening existing steel structures is often imperative due to additional imposed loads or alterations of primary function [1]. Methods used to reinforce steel structures include welding cover plates [2–4], bonding steel plates or fibre reinforced polymer materials [5–7], external post-tensioning using tendons [8–10]. For steel tubular columns, infilling concrete into the tube columns is another feasible retrofit technique that has little effect on both the appearance and the net area. The infilled concrete benefits from the confining effect provided by the steel tube and may also delay the occurrence of local buckling [11–14]. As a result, the load-carrying capacity of an existing steel tubular column can be significantly enhanced. It is noted that the infilling concrete will introduce additional self-weight to the structural system, yet this can be considered in the retrofitting process, with additional design checks to be conducted. Generally, it would be essential to unload the columns prior to strengthening. However, it is inconvenient and often infeasible to unload the column before strengthening, therefore the strengthening process is carried out while the member is subjected to self-weight and external actions [15–17]. The composite strength and flexural stiffness is sensitive to this existing load; therefore, in this paper, the overall buckling behaviour of circular hollow section (CHS) steel columns strengthened by infilling concrete under preload is investigated.

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