مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی مهار آرماتورهای طولی تیر بتن‌آرمه در اتصال با مقطع فولادی محاط در ستون بتن‌آرمه

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
2 استاد ممتاز، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
3 استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران
چکیده
در سال‌های اخیر استفاده از ستون‌های مرکب در سازه‌های بلند افزایش یافته است. یکی از مهم‌ترین موضوعات در بحث اتصالات کامپوزیت، اتصال مناسب بین مقطع فولادی محاط در ستون بتن‌آرمه و تیر بتن‌آرمه است. در این پژوهش، سه نمونه آزمایشگاهی جهت بررسی اثر همزمان استفاده از مقطع فولادی در ستون بتن‌آرمه، مقطع فولادی در ناحیه اتصال (قطعه انتقالی) تیر بتن‌آرمه به مقطع فولادی محاط در ستون بتن‌آرمه و مهار آرماتورهای طولی تیر بتن‌آرمه به روش اتصال جوشی و ارائه یک اتصال کامپوزیت جدید طراحی و ساخته شده و تحت بارگذاری چرخه‌ای قرار گرفته است. پارامترهای اصلی این آزمایش بررسی اثر استفاده مقطع فولادی محاط در ستون بتن‌آرمه، قطعه انتقالی در ناحیه اتصال و نحوه مهار آرماتورهای طولی تیر به روش اتصال جوشی، بر ظرفیت باربری اتصال، سختی، انرژی تلف شده و شکل‌پذیری اتصال بوده است. نتایج نشان می‌دهد ظرفیت باربری نمونه با مقطع فولادی در ستون بتن‌آرمه و قطعه انتقالی در ناحیه اتصال تیر و مهار آرماتورهای طولی تیر به روش اتصال جوشی، نسبت به نمونه تیر و ستون بتن‌آرمه و نمونه تیر بتن‌آرمه و مقطع فولادی محاط در ستون بتن‌آرمه، به ترتیب 35% و 26% افزایش یافته است. سختی نمونه با مقطع فولادی در ستون بتن‌آرمه و قطعه انتقالی در ناحیه اتصال تیر و همچنین مهار آرماتورهای طولی تیر به روش اتصال جوشی، نسبت به نمونه تیر بتن‌آرمه و مقطع فولادی محاط در ستون بتن‌آرمه 60% افزایش یافته و نمونه با مقطع فولادی محاط در ستون بتن‌آرمه نسبت به تیر و ستون بتن‌آرمه %44 افزایش یافته است. نتایج شکل‌پذیری نمونه‌ها، نشان می‌دهد نمونه دارای قطعه انتقالی در ناحیه اتصال تیر و مقطع فولادی محاط در ستون بتن‌آرمه نسبت به نمونه با مقطع فولادی محاط در ستون بتن‌آرمه 5% و نمونه با مقطع فولادی محاط در ستون بتن‌آرمه نسبت به نمونه با تیر و ستون بتن‌آرمه 8% افزایش یافته است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigation of Longitudinal Reinforcement Anchorage of Reinforced Concrete Beam at the Joint with Steel Encased Reinforced Concrete Column

نویسندگان English

Seyedeh Marzieh Qiyami Taklymi 1
Ali Kheyroddin 2
Omid Rezaifar 3
1 Ph.D. Candidate, Department of Civil Engineering, Semnan University
2 Distinguished Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده English

In this study, three experimental specimens were fabricated and subjected to cyclic loading to investigate the simultaneous effect of the steel encased in the reinforced concrete column and the use of a steel in the joint region (transition part) between the reinforced concrete beam and the steel encased in the reinforced concrete column. Additionally, the longitudinal reinforcement bars of the reinforced concrete beam were anchored using welded connections, introducing a new type of composite joint. The main parameters examined in this study include the effect of the steel encased in the reinforced concrete column, the transition part in the joint region, and the anchorage method of longitudinal beam reinforcements using welded connections on the load-bearing capacity, stiffness, energy dissipation, and ductility of the joint. The load-bearing capacity of the specimen incorporating the steel encased in the column and the transition part, along with welded anchorage of longitudinal beam reinforcements, increased by 35% and 26% compared to the reinforced concrete beam-column specimen and the reinforced concrete beam with a steel encased in the column, respectively. The stiffness of the specimen incorporating the steel encased in the column, the transition part, and the welded anchorage of longitudinal beam reinforcements increased by 60% compared to the specimen with a reinforced concrete beam and a steel encased in the column. The stiffness of the specimen with a steel encased in the column increased by 44% compared to the fully reinforced concrete beam-column specimen. The ductility results show that the specimen with the transition part and the steel encased in the column exhibited a 5% increase in ductility compared to the specimen with only the steel encased in the column. The specimen with the steel encased in the column showed an 8% increase in ductility compared to the fully reinforced concrete beam-column specimen.

کلیدواژه‌ها English

Steel Encased in the Reinforced Concrete Column
Reiforced Concrete Beam
Transition Part
Anchorage of Reinforcement
Welded Connections
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  • تاریخ دریافت 17 بهمن 1403
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