Nonlinear finite element study on the improvement of shear capacity in reinforced concrete T-Section beams by an alternative diagonal shear reinforcement

Demir, Aydın; Öztürk, Hakan; Sümer, Yusuf

doi:10.1016/j.engstruct.2016.04.029

Cited by 51 publications

(21 citation statements)

References 19 publications

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“…where σ is actual stress and σ( ) is nominal stress. e shear lag coefficient is related to the wide span ratio, support conditions, load form, cross-sectional shape and size, material properties, and location of the section [23][24][25]. In the final analysis, the shear lag is caused by uneven distribution of the longitudinal normal stress caused by internal force; its size and distribution are related to the internal force state; that is, the bending moment is related to the axial force.…”

Section: Distribution Of Shear Lag Effect During Construction Stagementioning

confidence: 99%

PC Cable‐Stayed Bridge Main Girder Shear Lag Effects: Assessment of Single Cable Plane in Construction Stage

Sun

Bao

2020

Advances in Materials Science and Engineering

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A model test and finite element analysis were conducted in this study to determine the distribution law of shear lag effect in the main beam section, a box girder, during the cable-stayed bridge construction process. The experimental and theoretical results were compared in an example of loading the control section. The stress value of the cable tension area of the main beam upper edge was found to markedly change when tensiling the cable force and was accompanied by prominent shear lag effect. After a hanging basket load was applied, the main beam of certain sections showed alternating positive and negative shear lag characteristics. The shear lag distribution law in the box girder of the single-cable-plane prestressed concrete cable-stayed bridge along the longitudinal direction was determined in order to observe the stress distribution of the girder. The results show that finite element analysis of the plane bar system should be conducted at different positions in the bridge under construction; the calculated shear lag coefficient of the cable force acting at the cable end of the cantilever reflects the actual force. In the beam segments between the cable forces, the shear lag coefficient determined by the ratio of the bending moment to the axial force reflects the actual stress at the cable force action point. In the midspan beam section between the action points of cable forces, the shear lag coefficient of the bending moment reflects the actual stress. The section shear lag coefficient can be obtained by linear interpolation of the beam section between the cable action point and the middle of the span.

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Section: Distribution Of Shear Lag Effect During Construction Stagementioning

confidence: 99%

PC Cable‐Stayed Bridge Main Girder Shear Lag Effects: Assessment of Single Cable Plane in Construction Stage

Sun

Bao

2020

Advances in Materials Science and Engineering

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“…The Concrete Damaged Plasticity inbuilt model is adopted, whereas for steel an "elastic-ideal plastic" model is used [7,[9][10][11][12]. The CDP model based on the material properties is listed in Table 1.…”

Section: Numerical Modelmentioning

confidence: 99%

“…The purpose is to achieve the best correlation with the laboratory tests results. Also, analysis is performed to find parameters of the key impact on response and their value ranges which can be used in further investigations [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of surface based cohesive parameters on static performance of concrete composite T-shaped beams

Jabłoński

Halicka

2019

MATEC Web Conf.

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The study presented constitutes the next step of authors’ investigations on the concrete composite T-shaped beams. The comparison of the failure modes and crack patterns of numerical models and beams tested was performed previously. In this paper, analyses concentrate on determination the proper values of cohesive surface parameters ensuring the high conformity of deformation and strains of the numerical model to the experimental results. In the particular series of beams the interfaces between concrete parts are varied as follows: reinforced joint with normal and tangential interactions only (BZ/S2/A), non-reinforced joint with adhesion (BZ/P), and reinforced joint with adhesion (BZ/P+S). Material properties used in numerical model are based on obtained in the laboratory ones. Furthermore, the ‘traction–separation’ law in the ABAQUS software defining the cohesion surface is used and analysis of the cohesive parameters response to interface roughness is carried out. The results show a strong dependence between the cohesion surface parameters and the response of the composite beam. A very good convergence of the numerical model with the experimental results in terms of ‘force-displacement’ relationship is achieved. Finally the parameters defined in the ABAQUS are determined, which have a key impact on the beams response.

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“…Although joints have a restricted area, they are strongly involved in the transfer of forces, mostly under earthquakes. In particular, they often present low shear strength in the joints, leading to brittle shear failures [1,2]. An inadequate design can lead to a shear failure of beam-column joints and to a consequent collapse of the structure [3], particularly in the case of earthquakes [4][5][6][7], even if they are expected to be safe according to classical seismic evaluations that column shear, the tensile forces of longitudinal bars that cross the joint panel are named F1, F2, F7, and F8, and the compressive forces (assumed as acting at the position of the bars) are named F3, F4, F5, and F6, while the F9, F10 are the resultant force carried by stirrups and/or eventual external reinforcement, and C is the concrete compressive resultants on half of the diagonal (i.e., 0.5H b /sin ϑ) of the joint panel.…”

Section: Introductionmentioning

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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Nonlinear finite element study on the improvement of shear capacity in reinforced concrete T-Section beams by an alternative diagonal shear reinforcement

Cited by 51 publications

References 19 publications

PC Cable‐Stayed Bridge Main Girder Shear Lag Effects: Assessment of Single Cable Plane in Construction Stage

PC Cable‐Stayed Bridge Main Girder Shear Lag Effects: Assessment of Single Cable Plane in Construction Stage

Influence of surface based cohesive parameters on static performance of concrete composite T-shaped beams

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

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