Experimental and Numerical Investigations on the Seismic Behavior of Lightly Reinforced Concrete Beam-Column Joints

Li, Bing; Tran, Cao Thanh Ngoc; Pan, Tso–Chien

doi:10.1061/(asce)st.1943-541x.0000040

Cited by 27 publications

(10 citation statements)

References 4 publications

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“…At present semi-empirical formulas for predicting the joint shear strength based on test results are given in the concrete structure design code (GB 50010-2010, 2010) as shown by formula (1), but the specification is too simple and no specific calculation method for the sandwich joint is recommended in structural analysis. Previous research focused on the plane joint, while the tests results of the space beam–column joints with slabs indicate that the analysis model needs further study (Li et al, 2009; Park and Mosalam, 2013). Based on the strut-and-tie model, a softened strut-and-tie model which considers concrete softening was developed by Hwang and Lee (2000).…”

Section: Shear Carrying Capacitymentioning

confidence: 99%

Mechanical performance of space sandwich joints under bidirectional cyclic loading

Hou

Chen

Yan

et al. 2018

Advances in Structural Engineering

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In high-rise buildings with high-strength concrete column and normal-strength concrete floor, the beams and slabs are usually cast in a continuous fashion through the beam–column joint to simplify construction, and this results in the lower strength concrete at the beam–column joint core (sandwich joint). It will influence the capacity of the joint. In this article, three groups of three-dimensional specimens consisting of sandwich joint specimens and corresponding traditional joint specimens were tested under bidirectional reversed cyclic loads to investigate seismic performance, including the failure mode, ductility, energy dissipation, and deformation. The test results show that the beam–column joint core can be cast with normal-strength concrete when the column concrete strength is less than 1.5 times that of the beam. However, when the ratio exceeds 1.5, the failure mode of the joint may change from beams flexural failure to joint shear failure and additional strengthening measures should be taken. Finally, the formula for calculating shear capacity of the three-dimensional sandwich joints is presented, and the predictions are compared to the experimental results.

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Section: Shear Carrying Capacitymentioning

confidence: 99%

Mechanical performance of space sandwich joints under bidirectional cyclic loading

Hou

Chen

Yan

et al. 2018

Advances in Structural Engineering

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“…The mechanical properties of SCC have been widely investigated (Tsonos et al 1993; Persson The results mentioned the aggregate interlock contribution in the shear capacity of high-strength concrete. In the case of numerical investigations, some studies are in the literature that reported success in simulating highly nonlinear problems also vital models for concrete and steel (Li B et al 2009 andDashti et al2017).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Reinforcing Bars Ratio Effects on SCC Beam-Column Joint Performance

Ghatte¹

2019

Uludağ University Journal of the Faculty of Engineering

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Beam-column joints require a high ductility during the unexpected loadings that necessitate the need for ductile concrete in such unprotected locations. Alternatively, self-compacting concrete (SCC) is a sort of concrete which has generated tremendous interest throughout the last decades in order to reach a ductile structural elements during the seismic actions. Specific properties of this type of concrete include high performance, high resistance against segregation and needless to internal or external vibration in order to compact. In the seismic regions, ductility is one of the most important factors in the design of reinforced concrete (RC) members, especially structural joints flexural performance; it is due to the enhance in the capability of plastic deformability. This paper describes load-displacement behavior of experimental and theoretical analysis of four SCC beam-column joints with different percentage of the ratio of the reinforcing bars (ρ). In the theoretical phase of this investigation three-dimensional nonlinear finite element method (FEM) model i.e., Seismostruct was used and the load-deflection diagrams were plotted to compare the test results with the numerical output. The experimental results and nonlinear FEM modeling indicate that using SCC as a workable concrete in beam-column joints of reinforced concrete structures has satisfactory performance in terms of ductility and energy dissipations. Öz:Yüksek süneklik gerektiren kolon-kiriş düğüm noktaları gibi korunmasız bölgelerde, beklenmedik yüklemeler altında, sünek betona ihtiyaç duyulmaktadır. Alternatif olarak, kendiliğinden yerleşen beton (KYB), deprem etkisi altinda elemanların daha sünek davranış gösteren bir yapıya ulaşmak için son yıllarda büyük ilgi yaratan bir beton türüdür. Bu tipteki betonların belirgin özellikleri yüksek performans, segregasyona karşı yüksek direnç ve yerleşme için iç veya dış vibrasyona ihtiyaç duyulmamasıdır. Deprem bölgelerinde, süneklik, özellikle eğilmeye maruz kalan yapısal bağlantı noktalarının performansında önemli bir faktördür ve bu davranış plastik yerdeğiştirme kapasitesindeki artıştan kaynaklanmaktadır. Bu makalede, KYB kullanılan ve farklı donatı oranlarındaki dört adet kolon-kiriş düğüm noktasının yük-yerdeğiştirme davranışının deneysel ve teorik analizleri açıklanmaktadır. Bu araştırmanın teorik aşamasında, üç boyutlu sonlu elemanlar metodu (SEM), Seismostruct doğrusal olmayan yazılımı kullanılarak, deneysel-nümerik sonuçlar karşılaştırılmış ve yük-yerdeğiştirme diyagramları çizdirilmiştir. Deneysel sonuçlar ve doğrusal olmayan SEM modeli, kolon-kiriş düğüm noktalarında işlenebilir beton olarak KYB'un kullanımının, betonarme yapılarda süneklik ve enerji yutma kapasitesi bakımından tatmin edici bir performansa sahip olduğunu göstermiştir.

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“…This paper presents an analytical model developed to predict the cyclic performance of high-strength self-compacting concrete (HSSCC) beam-column joints. So far, various micro analyses [2,3] have been performed to assess/predict the seismic performance of conventionally vibrated BCJs of normal/medium strength concrete (of compressive strength between 30 and 70 MPa). When dealing with HSSCC, the highstrength material properties as well as the differences in the mix proportion may affect the mechanical properties (such as modulus of elasticity and bond) in comparison to the normal concrete.…”

Section: Introductionmentioning

confidence: 99%

“…For the numerical investigations reported in this study, a finite element analysis program DIANA [4] was chosen as it is known to be capable of convincingly dealing with the complexities and nonlinearities involved in modelling reinforced concrete. It was chosen not only because of its reported success in simulating highly nonlinear problems [1,2,5,6], but also because it has multiple constitutive models for concrete and steel to choose from. Three experimentally tested HSSCC beam-column subassemblies were modelled and analysed using DIANA.…”

Section: Introductionmentioning

confidence: 99%

Cyclic response analysis of high-strength self-compacting concrete beam-column joints

Ashtiani¹,

Dhakal

Scott

2018

BNZSEE

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In this paper, finite element analysis software “DIANA” is implemented to simulate quasi-static cyclic loading test results of three full-scale beam-column joints cast with high-strength self-compacting concrete (HSSCC). The specimens were designed according to the New Zealand concrete standard (NZS3101 2006). Material models for concrete and steel were calibrated based on the physical characteristics of the materials derived either from laboratory tests or using expressions available in literature. Two-dimensional curved-shell elements were used in modelling the specimens. As the specimens were designed following the code requirements for seismic actions, bond between the reinforcement and concrete was assumed as perfect. In order to obtain a more representative prediction, both the longitudinal and transverse reinforcement were modelled in their actual locations. Pushover analyses were first conducted to check the mesh sensitivity; after which the modelled specimens were subjected to reversed cyclic loading histories applied in the experimental tests. Seismically important response parameters such as damping, stiffness, concrete and steel contributions in the joint shear resistance, joint shear deformation, strain development in the joint stirrups, elongation of the plastic hinge zone, development of compressive stress, and cracking pattern were extracted from the analytical predictions and compared to the experimental results. It was found that the adopted modelling and analysis approach was capable of predicting cyclic performance of HSSCC beam-column subassemblies with reasonable accuracy.

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Experimental and Numerical Investigations on the Seismic Behavior of Lightly Reinforced Concrete Beam-Column Joints

Cited by 27 publications

References 4 publications

Mechanical performance of space sandwich joints under bidirectional cyclic loading

Mechanical performance of space sandwich joints under bidirectional cyclic loading

Evaluation of Reinforcing Bars Ratio Effects on SCC Beam-Column Joint Performance

Cyclic response analysis of high-strength self-compacting concrete beam-column joints

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