Application of Near Surface Mounted (NSM) technique for Seismic Retrofitting of Heritage Buildings
نویسندگان
چکیده مقاله:
The high vulnerability of the cultural buildings due to seismic actions urged researchers to retrofit them using reversible and compatible techniques. The application of fiber reinforced polymer (FRP) for enhancing the structural behavior of masonry buildings, under seismic actions, has been studied by many researchers. The near-surface mounting (NSM) technique is a relatively new retrofitting approach that involves bonding FRP bars/strips inserted into grooves cut of mortar joints. This method is an appropriate technique to be used in seismic retrofitting of heritage buildings, because of its low influence on the global mass, high strength-to-weight ratios, minimum durability concern, ease of handling, flexibility and fast installation that improve on-site productivity, low impact of building functions, and low architectural and structural interventions. No.1 Educational heritage building of Tabriz Islamic Art University has flexible diaphragms with unreinforced masonry walls as lateral and gravitational resisting system. The masonry walls have no tie beams or columns and appropriate connection to the floors. Furthermore, the building has irregularity in plane because of length to width ratio more than 3. Another deficiency of this building to resist seismic load is related to the existence of small percentage of masonry wall in transversal direction compared with longitudinal direction, which can be result in torsional irregularity in the structure. The aim of this paper is to investigate the effectiveness of applying NSM technique on seismic performance of this heritage building. For this purpose, a 3D Equivalent frame model was created in 3Muri software to simulate the structural behavior of strengthened masonry walls. The masonry was modeled by macro-modeling approach and FRP bars/strips were modeled as attaching to the masonry walls. A safety index value according to “Guidelines for evaluation and mitigation of seismic risk to cultural heritage”, have been calculated to evaluate the seismic behavior of the building before and after applying retrofitting method. The selected safety index depends on shear strength of the structure, site seismic hazard zone and the desired building performance level. Nonlinear static analysis has been employed by 3Muri software to evaluate the safety index for selected limit states including Ultimate Limit State (SLU) and Damage Limit State (SLD). The distribution of lateral load is done in two different modes; proportional to the shape of the first mode and proportional to story mass. Based on the results of twenty-four pushover analysis, it has been concluded that inserting the FRP strips to the masonry walls and adding new masonry walls reinforced by FRP bars, increase the safety index significantly in both directions, especially in the transversal direction. Also it has been observed that shear strength of the building increased considerably after applying the retrofitting design relative to the existing condition. More uniform distribution of the safety index between different analyses was another positive effect of using this technique. The results of this research demonstrated the advantages of using NSM technique for seismic performance of heritage buildings and are based on a numerical modeling and pushover analysis which uses the performance criteria of safety index, while more experimental and numerical studies are proposed for future studies.
منابع مشابه
application of upfc based on svpwm for power quality improvement
در سالهای اخیر،اختلالات کیفیت توان مهمترین موضوع می باشد که محققان زیادی را برای پیدا کردن راه حلی برای حل آن علاقه مند ساخته است.امروزه کیفیت توان در سیستم قدرت برای مراکز صنعتی،تجاری وکاربردهای بیمارستانی مسئله مهمی می باشد.مشکل ولتاژمثل شرایط افت ولتاژواضافه جریان ناشی از اتصال کوتاه مدار یا وقوع خطا در سیستم بیشتر مورد توجه می باشد. برای مطالعه افت ولتاژ واضافه جریان،محققان زیادی کار کرده ...
15 صفحه اولan application of fuzzy logic for car insurance underwriting
در ایران بیمه خودرو سهم بزرگی در صنعت بیمه دارد. تعیین حق بیمه مناسب و عادلانه نیازمند طبقه بندی خریداران بیمه نامه براساس خطرات احتمالی آنها است. عوامل ریسکی فراوانی می تواند بر این قیمت گذاری تاثیر بگذارد. طبقه بندی و تعیین میزان تاثیر گذاری هر عامل ریسکی بر قیمت گذاری بیمه خودرو پیچیدگی خاصی دارد. در این پایان نامه سعی در ارائه راهی جدید برای طبقه بندی عوامل ریسکی با استفاده از اصول و روش ها...
Investigating Efficiency of Shotcrete for Retrofitting Masonry Buildings
One of a feasible and efficient method to retrofit structures is spraying shotcrete which is widely applied around the world. Shotcrete is concrete with fine aggregates which are sprayed through a hose and by air pressure coat at high velocity onto a surface. In the current research, three masonry schools from different regions of Iran are selected. The retrofitted wall surfaces have been prepa...
متن کاملThe Effect of Analysis Methods on the Response of Steel Dual-System Frame Buildings for Seismic Retrofitting
In the present paper, the focus is on the evaluation of steel dual-system frame buildings using four main types of structural analysis (Linear Static, Linear Dynamic, Nonlinear Static and Nonlinear Dynamic Analyses) with regard to "Seismic Rehabilitation Code for Existing Buildings in Iran" (based on FEMA 273 and 356) where the first two authors of the article tend to follow the previous work (...
متن کاملSeismic Conservation Strategies for Cultural Heritage Buildings in Switzerland
Cultural heritage buildings were typically built without considering seismic action and are therefore potentially susceptible to earthquake damage. The performance states and protection objectives developed for ordinary buildings are not directly applicable since they do not address the cultural importance of the heritage buildings. This paper proposes a seismic conservation strategy for cultur...
متن کاملapplication and construction of carbon paste modified electrodes developed for determination of metal ions in some real samples
ساخت الکترودهاِی اصلاح شده ِیکِی از چالشهاِی همِیشگِی در دانش شیمِی بوِیژه شیمِی تجزیه مِی باشد ،که با در نظر گرفتن سادگِی ساخت، کاربردی بودن و ارزان بودن روش مِی توان به باارزش بودن چنِین سنسورهاِی پِی برد.آنچه که در ادامه آورده شده به ساخت و کاربرد الکترودهاِی اصلاح شده با استفاده از نانو ذرات در اندازه گِیرِی ولتامترِی آهن وکادمِیم اشاره دارد. کار اول اختصاص دارد به ساخت الکترود خمِیر کربن اصلاح شده با لِیگاند داِ...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ذخیره در منابع من قبلا به منابع من ذحیره شده{@ msg_add @}
عنوان ژورنال
دوره 6 شماره None
صفحات 97- 118
تاریخ انتشار 2020-06
با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.
کلمات کلیدی برای این مقاله ارائه نشده است
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023