مقاله انگلیسی رایگان در مورد ارزیابی تعمیرات برای ترکهای خستگی ناشی از اعوجاج در یک مجموعه پل دو طبقه – الزویر ۲۰۱۹

elsevier

 

مشخصات مقاله
ترجمه عنوان مقاله ارزیابی تعمیرات برای ترکهای خستگی ناشی از اعوجاج در یک مجموعه پل دو طبقه مقاوم سازی شده در برابر لرزه
عنوان انگلیسی مقاله Repair assessment for distortion-induced fatigue cracks in a seismically retrofitted double-deck bridge complex
انتشار مقاله سال ۲۰۱۹
تعداد صفحات مقاله انگلیسی ۱۱ صفحه
هزینه دانلود مقاله انگلیسی رایگان میباشد.
پایگاه داده نشریه الزویر
نوع نگارش مقاله
مقاله کوتاه (Short communication)
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نمایه (index) Scopus – Master Journals List – JCR
نوع مقاله ISI
فرمت مقاله انگلیسی  PDF
ایمپکت فاکتور(IF)
۳٫۶۰۴ در سال ۲۰۱۸
شاخص H_index ۱۱۴ در سال ۲۰۱۹
شاخص SJR ۱٫۶۲۸ در سال ۲۰۱۸
شناسه ISSN ۰۱۴۱-۰۲۹۶
شاخص Quartile (چارک) Q1 در سال ۲۰۱۸
مدل مفهومی ندارد
پرسشنامه ندارد
متغیر ندارد
رفرنس دارد
رشته های مرتبط مهندسی عمران
گرایش های مرتبط سازه، مدیریت ساخت، زلزله
نوع ارائه مقاله
ژورنال
مجله  سازه های مهندسی – Engineering Structures
دانشگاه Parks College of Aviation, Engineering and Technology, Saint Louis University, St. Louis, MO 63103, United States
کلمات کلیدی خستگی ناشی از اعوجاج، ترک خوردگی Web-gap، مقاوم سازی لرزه ای، خسارت، آزمایش میدان، آزمایش بار
کلمات کلیدی انگلیسی Distortion-induced fatigue، Web-gap cracking، Seismic retrofit، Damage، Field test، Load testing
شناسه دیجیتال – doi
https://doi.org/10.1016/j.engstruct.2019.01.004
کد محصول E11500
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فهرست مطالب مقاله:
Abstract

۱- Introduction

۲- Bridge description

۳- Bridge instrumentation

۴- Test procedure

۵- Field test results

۶- Finite element analysis

۷- Summary and conclusions

References

 

بخشی از متن مقاله:

Abstract

Many steel bridges in the United States designed before the mid-1980s are highly susceptible to distortion-induced fatigue cracking. This vulnerability is substantially increased if the out-of-plane driving force caused by differential girder displacement is increased for any reason. This research examines one such case where a double-deck bridge complex, originally built in the 1960s, was retrofitted to improve seismic performance. As part of the retrofit, single angle K-type diaphragms were replaced with stiffer double-angle cross-type diaphragms. This seismic retrofit led to an increase in web-gap stresses, and within approximately one year following the retrofit, inspectors identified numerous fatigue cracks in the web of longitudinal girders where connection plates terminate near top flanges. A repair measure was implemented to provide a positive connection between the connection plate and the girder flange. The purpose was to reduce the high stress concentrations in the web-gap region by restricting the out-of-plane distortion in the web-gap region. Field tests were carried out in addition to developing finite element (FE) models to investigate the efficacy of the repair technique. The results confirmed a significant decrease in the web-gap stress after implementation of the repair, and a subsequent FE analysis showed that the new load path through the repair angle section did not introduce a new fatigue sensitive area. In fact, the repair resulted in stresses well below the constant amplitude fatigue threshold (CAFT) for this type of detail.

Introduction

Most continuous-span double-deck viaducts built in the San Francisco Bay Area during the 1950s and 1960s were damaged during the 1989 Loma Prieta earthquake [1]. The deficiencies in these viaducts led to an immediate review of all double-deck bridge structures in the United States. One particular seismic retrofit project (and the focus of this work) involved a Midwestern double-deck bridge complex with substructure and superstructure elements without adequate capacity based on current seismic criteria [2,3]. A seismic retrofit strategy was adopted based on the criteria described in the FHWA Seismic Retrofitting Manual for Highway Bridges [4]. Almost immediately following completion of the seismic retrofit, horseshoe-shaped cracks were identified in the unstiffened regions (frequently called the web gap) of the longitudinal girders where the original K-type diaphragms were replaced with new, stiffer cross-diaphragms. This problem mostly occurs in bridges built in the United States prior to the mid-1980s when the design specifications required connection plates to have a tight-fit detail at the girder flanges, but not welded [5–۷]. Normally, part of the connection plate, attached to plate girders, must be clipped to clear the web-to-flange weld resulting in a soft and short section that is more flexible in the transverse direction than the rest of the girder’s height. This area in the web is known as the web-gap region. Cracks originating in this region are likely the result of secondary stresses resulting from out-of-plane distortion in the unstiffened web-gap region and account for approximately 90% of all fatigue cracking [23]. As a result, a significant number of older bridges have been affected by distortion-induced fatigue cracking in the web-gap region.

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