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논문 기본 정보

자료유형
학술저널
저자정보
Mohammed Ali Al‑Osta (King Fahd University of Petroleum and Minerals (KFUPM)) Umais Khan (King Fahd University of Petroleum and Minerals (KFUPM)) Mohammed Hussain Baluch (King Fahd University of Petroleum and Minerals (KFUPM)) Muhammad Kalimur Rahman (King Fahd University of Petroleum, & Minerals (KFUPM))
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.5
발행연도
2018.7
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683 - 702 (20page)

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초록· 키워드

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The focus of this paper is to investigate the effect of column axial load levels on the performance of shear deficient reinforced concrete beam column joints (BCJs) under monotonic and cyclic loading. The problem of interaction between shear stress in BCJ and axial load on column has been addressed in this work by initially postulating a mechanistic model and substantiated by an experimental test program. This was achieved by conducting appropriate tests on seven BCJ sub-assemblies subjected to monotonic and reversed cyclic loading, with varying levels of the column axial load. Experimental results were further validated using a finite element model in an ABAQUS environment. The effect of variation of compressive strength of concrete was considered in a subsequent parametric study, in order to obtain sufficient data, and utilized to develop a new shear strength model for BCJs which includes influences of all the important parameters required to predict the shear strength of BCJs. The results showed that column axial load affects the seismic performance of BCJs significantly. Experimental results demonstrated that at initial stages of loading, increase in axial load enhances the shear capacity of the joint and reduces its ductility. However, when the column axial load/axial strength ratio increases to about 0.6–0.7, shear strength starts to decrease rapidly, leading to pure axial failure of the joint. The magnitude of axial load/axial capacity ratio also dictates the failure mode and development of crack patterns in BCJs. Results of reverse cyclic tests on BCJs showed that high value of axial load/axial capacity ratio increases the initial stiffness of BCJ but rate of stiffness degradation is accelerated after peak strength attenuation.
#shear failure #beam-column joints #axial load #monotonic #reverse cyclic tests #finite element model #mechanistic model

목차

Abstract
1. Introduction
2. Evaluation of Existing BCJ’s Shear Strength Models
3. Mechanics of BCJ’s
4. Experimental Program
5. Experimental Results and Discussions
6. Numerical Modeling of BCJs
7. Shear Strength Equation for BCJs
8. Conclusions
References

참고문헌 (20)

참고문헌 신청
ACI Committee, 318-14. (2014). Building code requirements for structural concrete and commentary. ACI-ASCE Committee 352. (2002). Recommendations for design of beam-column connections in monolithic reinforced concrete structures. Farmington Hills: American Concrete Institute. Al-Osta, M., Al-Khatib, A., Baluch, M., Azad, A., & Rahman, M. (2017). Performance of hybrid beam-column joint cast with high strength concrete. Earthquakes and Structures, 12(6), 603?617. Antonopoulos, C. P., & Triantafillou, T. C. (2003). Experimental investigation of FRP strengthened RC beam-column joints. ACSE Journal of Composites for Construction, 7(1), 39?49. Bakir, P. G., & Boduroglu, H. M. (2002). A new design equation for predicting the joint shear strength of monotonically loaded exterior beam-column joints. Engineering Structures, 24(8), 1105?1117.

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