رفتارهای خمشی و برشی در تیرها بتونی
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رفتارهای خمشی و برشی در تیرها بتونی

عنوان فارسی مقاله: مدل سازی کارآمد رفتارهای خمشی و برشی در تیرها و ستون های بتونی مسلح در معرض بارگذاری ضربه ای کم سرعت
عنوان انگلیسی مقاله: Efficient modeling of flexural and shear behaviors in reinforced concrete beams and columns subjected to low-velocity impact loading
مجله/کنفرانس: سازه های مهندسی – Engineering Structures
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: سازه
کلمات کلیدی فارسی: مدل سازی کارآمد، تیرها و ستون های بتونی مسلح، پاسخ های ضربه ای، عناصر ستونی میله ای بخش فیبر، رفتار برشی
کلمات کلیدی انگلیسی: Efficient modeling، Reinforced concrete beams and columns، Impact responses، Fiber-section beam-column elements، Shear behaviors
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
نمایه: Scopus – Master Journals List – JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.engstruct.2019.05.082
دانشگاه: Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2019
ایمپکت فاکتور: 3.604 در سال 2018
شاخص H_index: 114 در سال 2019
شاخص SJR: 1.628 در سال 2018
شناسه ISSN: 0141-0296
شاخص Quartile (چارک): Q1 در سال 2018
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 29
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: E12414
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1. Introduction


2. Modeling of flexure-dominated failure in RC beams


3. Modeling of shear failure in RC members


4. Modeling of RC columns and validations


5. Summary of the proposed method and discussions


6. Conclusions


Acknowledgments


Appendix A. Supplementary material


Research Data


References

نمونه متن انگلیسی مقاله

Abstract


Detailed finite element (FE) models with 3-D solid elements are typically used to simulate impact behaviors of reinforced concrete (RC) beams and columns. However, the method usually requires a substantial amount of time and effort to model concrete and reinforcement and conduct nonlinear contact-impact analyses. Also, the accuracy of the method cannot be guaranteed due to the limitations in concrete material models implemented in general-purpose FE codes. In this paper, an efficient modeling method is proposed to capture both flexural and shear behaviors of RC beams and columns under low-velocity impact loading. A macroelement-based contact model was developed in the proposed method to capture interaction behaviors between impacting objects and RC members. In the contact model, a compression-only spring with an initial gap behavior was used to account for the stiffness and the kinematic response of an impacting object, and a combination of an elastic spring and a viscous damper in parallel was employed to simulate the contact stiffness and damping. By properly approximating the strain-rate effects, traditional fiber-section elements were demonstrated to be capable of predicting impact-induced flexural failures for RC members. On this basis, a general approach for both flexural- and shearcritical RC columns under impact loading was presented with the inclusion of additional shear springs in the fiber-section elements. Nearly fifty impact tests on RC beams and columns reported in the literature were employed to validate the proposed modeling method. Comparisons between the experimental and numerical results indicate that failure modes of the impacted members can be identified explicitly by the use of the proposed modeling method. Also, reasonable agreements were achieved for the impact forces and the impact-induced responses obtained from the impact tests and the analyses. The proposed method can be readily implemented without coding in any FE software as long as traditional fiber-section elements, and discrete macroelements are available. This feature would offer an advantage for the applications of the proposed method such as when assessing the structural response and vulnerability of a bridge structure subjected to vessel and vehicle collisions.


Introduction


Numerous catastrophic accidents such as vessel or vehicle collisions with reinforced concrete (RC) columns happened in recent years around the world [1–4]. In this context, many impact tests have been carried out to clarify the behaviors of RC beams and columns subjected to impact loading (e.g. [5–11]). However, it might be unrealistic always to perform physical experiments because of the massive investments in the economy and time. On the other hand, relatively small-scale RC specimens are usually used in these impact tests due to the limits in laboratory space and the capacity of impact testing facilities. Strictly speaking, these experimental results only partially addressed the impact behaviors of full-scale RC members. Hence, analysis methods should be well established based on these test data to efficiently and accurately assess the responses of RC members under impact loading. Currently, many studies have been carried out to develop detailed FE models with the use of general-purpose contact-impact nonlinear FE codes (e.g., LS-DYNA and ABAQUS) for RC members under impact loads [12–17]. Among these studies, 3-D solid elements were mostly used for concrete while beam/truss elements were employed to model reinforcing rebars.

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