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تحلیل اجزاء محدود و تجربی رفتار پیوستگی بین آرماتور و بتن حاوی الیاف، میکروسیلیس و نانوسیلیس | ||
مدل سازی در مهندسی | ||
مقاله 11، دوره 16، شماره 54، مهر 1397، صفحه 153-166 اصل مقاله (1.79 M) | ||
نوع مقاله: پژوهشی | ||
شناسه دیجیتال (DOI): 10.22075/jme.2017.5812. | ||
نویسندگان | ||
حمید اسکندری* ؛ مسعود نعمتی نژاد | ||
دانشگاه حکیم سبزواری | ||
تاریخ دریافت: 24 بهمن 1394، تاریخ بازنگری: 24 تیر 1396، تاریخ پذیرش: 12 مهر 1396 | ||
چکیده | ||
رفتار پیوستگی بین آرماتور و بتن به جهت کاربرد روزافزون بتن مسلح در سازه های مختلف از جمله مهم ترین موضوعات مورد بررسی در دنیا میباشد. در این پژوهش کـه بهصورت آزمایشگاهی و مدلسازی اجزاء محدود توسط نرم افزار ABAQUS انجامگرفته است، 36 طرح اختلاط بتنی با سه نوع رده مقاومتی سیمان و با درصدهای مختلف الیاف پلیمری، میکروسیلیس و نانوسیلیس ساخته شده و تاثیر این مواد بر رفتار پیوستگی بین آرماتورهای فولادی و بـتن و برخی خـواص مکـانیکی بـتن ازجمله مقاومـت فشـاری آن سنجیده شده است. روش استفاده از فنر غیرخطی نیز جهت مدلسازی این رفتار پیوستگی ارائه شده و مورد تحلیل دینامیکی غیرخطی واقع شده است. نتایج حاکی از هماهنگی قابل قبول مدل با نتایج آزمایشگاهی دارد. همچنین نشان میدهد در این روش به دلیل وجود فنر، نحوه مش بندی المانها تاثیر ناچیزی بر نتایج پیوستگی- لغزش خواهد داشت. علاوه بر این، نتایج حاصل از آزمایشات و مقایسه آن با نتایج مدلسازی نشان میدهد که تاثیر الیاف در مقاومت پیوستگی ناچیز ولی در نحوه شکست بسیار موثر است. ترکیب توام میکرو و نانوسیلیس نیز میتواند باعث بهبود مقاومت پیوستگی در حدود 20% گردد به طوری که استفاده از درصدی برابر از این دو ماده بهترین نتایج مقاومت پیوستگی را به دنبال داشته است. | ||
کلیدواژهها | ||
بتن؛ الیاف؛ میکروسیلیس؛ نانوسیلیس؛ رفتار پیوستگی؛ مدلسازی اجزاء محدود؛ تحلیل دینامیکی غیرخطی؛ آزمایش Pull-out | ||
عنوان مقاله [English] | ||
Finite Element and Experimental Analysis of Bond Behavior Between Reinforcement and Concrete Containing Fibers, Silicafume and Nanosilica | ||
نویسندگان [English] | ||
Hamid Eskandari؛ Masoud Nematinejad | ||
چکیده [English] | ||
Bond behavior between reinforcement and concrete, due to increasing application of reinforced concrete, is one of the most important issues all over the world. In this research, which has been done experimentally and finite element (FE) modeling (using ABAQUS software), 36 mixtures are deigned considering three cement strength grades and various percentages of polymer fibers, silica fume and nano-silica. The effects of these admixtures on the bond behavior between concrete and reinforcement and also the compressive strength of concrete are investigated. The method of applying nonlinear spring (translator) for finite element modeling is presented and the model is analyzed using nonlinear dynamic analysis. The results yielded acceptable correlation between experimental and FE model. Since there are some translators in model, it can be mentioned that the results of bond slip are not influenced by meshing algorithm. Moreover, comparison of the experimental and FE results showed that while the effect of fiber in bond strength is negligible, it can be so effective in determining the failure shape. The combination of silica fume and nano silica can also improve the bond strength about 20% so that applying equal amount of these two admixtures may leads to the best strength results. | ||
کلیدواژهها [English] | ||
Concrete, Fibers, Silica Fume, Nanosilica, Bond behavior, Finite element modeling, nonlinear dynamic analysis, Pull-out Test | ||
مراجع | ||
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