Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

Bossio, Antonio; Fabbrocino, Francesco; Lignola, Gian Piero; Prota, Andrea; Manfredi, Gaetano

doi:10.3390/polym7091479

Cited by 47 publications

(14 citation statements)

References 10 publications

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“…Future extensions of the present study (see, e.g., [28]) will focus on nano-, micro-and macroscale lattice reinforcements for a wide range composite materials, through a closed-loop approach including the computational design and the additive manufacturing of physical models via innovative, multimaterial deposition techniques. Such materials will be used, e.g., for the fabrication of innovative materials, and the structural retrofitting of existing buildings and historical constructions [29][30][31] [32]. An experimental characterization phase will implement and verify the theoretical predictions.…”

Section: Discussionmentioning

confidence: 99%

Optimal Design and Additive Manufacturing of Novel Reinforcing Elements for Composite Materials

Fabbrocino¹,

Farina²,

Amendola³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Section: Discussionmentioning

confidence: 99%

Optimal Design and Additive Manufacturing of Novel Reinforcing Elements for Composite Materials

Fabbrocino¹,

Farina²,

Amendola³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…Differently from internal joints (Bossio et al [29]), T-shaped joints are lacking in symmetry simplifications, and positive sign of shear needs to be distinguished from negative one. In order to explain proposed model application, a worked example is provided in the Appendix A and some model predictions were compared to experimental tests.…”

Section: Behaviour Of Proposed Model and Validationmentioning

confidence: 99%

Design Oriented Model for the Assessment of T-Shaped Beam-Column Joints in Reinforced Concrete Frames

et al. 2017

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Abstract:Beam-column joints represent very important elements of reinforced concrete (RC) structures. In fact, beams and columns, at the boundary, generate internal forces acting on concrete core and on reinforcement bars with a very high gradient. To fully understand the seismic performances and the failure modes of T-shaped beam-column joints (external corner-positioned) in RC structures, a simplified analytical model of joint behaviour is proposed and theoretical simulations have been performed. The model is based on the solution of a system of equilibrium equations of cracked joint portions designed to evaluate internal stresses at different values of column shear forces. The main aim of the proposed model is to identify the strength hierarchy. Limit values of different internal stresses allow us to detect the occurrence of different failure modes (namely the failure of the cracked joint, the bond failure of passing through bars, and the flexural/shear failures of columns or beams) associated with column shear forces; the smaller one represents the capacity of the joint. The present work, focusing on T-shaped joints, could represent a useful tool for designers to quantify the performance of new structures or of existing ones. In fact, such a tool allows us to push an initial undesired failure mode to a more appropriate one to be evaluated. Finally, some experimental results of tests available in literature are reported, analysed, and compared to the predictions of the proposed model (by means of a worked example) and of some international codes. The outcomes confirm that failure modes and corresponding joint capacities require an analytical model, like the proposed one, to be accurately predicted.

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“…In recent years, there have been numerous studies [18][19][20][21][22][23][24][25][26] analyzing the behavior of reinforced concrete joints. In particular, models with moment-curvature graphs are an interesting way to simulate the complex behavior of large structures [27].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Steel Reinforced Concrete (SRC) Joints

Belda

Irles

Segura

et al. 2019

Metals

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This paper presents a three-dimensional finite element model to confirm experimental tests carried out on steel reinforced concrete joints. The nonlinear behavior of this concrete is simulated, along with its reduced capability to resist large displacements in compression. The aim was to obtain the plastic behavior of reinforced concrete beams with a numerical model in the same way as obtained experimentally, in which the reduction of strength in the post-critical stage was considered to simulate behavior until structures collapsed. To do this, a nonlinear calculation was necessary to simulate the behavior of each material. Three numerical models provide a moment-curvature graph of the cross-section until collapse. Simulation of the structural elements is a powerful tool that avoids having to carry out expensive experimental tests. From the experimental results a finite element model is simulated for the non-linear analysis of steel reinforced concrete joints. It is possible to simulate the decreasing stress behavior of the concrete until reaching considerable displacement. A new procedure is discussed to capture the moment-curvature diagram. This diagram can be used in a simplified frame analysis, considering post-critical behavior for future research.Metals 2019, 9, 131 2 of 20 to analyze the real behavior of the beam from the elastic to plastic range and collapse. Load was defined as a prescribed displacement located in the center of the beam to know its plastic behavior. The first model, P03, was a 3.6 m long pinned beam with a concentrated load in the center, with a steel reinforcement of four bars (12 mm in diameter). The second model, P04, had the same reinforcement, but with the addition of a 2 m long HEB-100 cross-section in the central part. The third model, P05, was a reinforced concrete beam capable of supporting a similar load to the P04 model, but without the metallic section, with a steel reinforcement of two bars (16 mm in diameter) and two bars (20 mm in diameter) ( Figure 2). Our conclusions were similar to those reached by recognized studies with more complex frames in which loads were applied in a reverse direction, such as in reference [2]. Recent research, such as in reference [3], shows that high-strength reinforced concrete structures confined with tubular profiles and embedded metal profiles display the best behavior. Metals 2018, 8, x FOR PEER REVIEW 2 of 20chosen because of the test frame's characteristics. Different constructive solutions were considered to analyze the real behavior of the beam from the elastic to plastic range and collapse. Load was defined as a prescribed displacement located in the center of the beam to know its plastic behavior. The first model, P03, was a 3.6 m long pinned beam with a concentrated load in the center, with a steel reinforcement of four bars (12 mm in diameter). The second model, P04, had the same reinforcement, but with the addition of a 2 m long HEB-100 cross-section in the central part. The third model, P05, was a reinforced concrete beam capable...

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Simplified Model for Strengthening Design of Beam–Column Internal Joints in Reinforced Concrete Frames

Cited by 47 publications

References 10 publications

Optimal Design and Additive Manufacturing of Novel Reinforcing Elements for Composite Materials

Optimal Design and Additive Manufacturing of Novel Reinforcing Elements for Composite Materials

Design Oriented Model for the Assessment of T-Shaped Beam-Column Joints in Reinforced Concrete Frames

Numerical Simulation of Steel Reinforced Concrete (SRC) Joints

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