مقاله انگلیسی رایگان در مورد ارزیابی تعمیرات برای ترکهای خستگی ناشی از اعوجاج در یک مجموعه پل دو طبقه – الزویر ۲۰۱۹
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) |
مقاله بیس | این مقاله بیس نمیباشد |
نمایه (index) | Scopus – Master Journals List – JCR |
نوع مقاله | ISI |
فرمت مقاله انگلیسی | |
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 |
وضعیت ترجمه مقاله | ترجمه آماده این مقاله موجود نمیباشد. میتوانید از طریق دکمه پایین سفارش دهید. |
دانلود رایگان مقاله | دانلود رایگان مقاله انگلیسی |
سفارش ترجمه این مقاله | سفارش ترجمه این مقاله |
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. |