Influence of Axial Load on the Seismic Behavior of RC Beam-Column Joints with Wide Beam

Masi, Angelo; Santarsiero, Giuseppe; Mossucca, Antonello; Nigro, Domenico Salvatore

doi:10.4028/www.scientific.net/amm.508.208

Cited by 22 publications

(18 citation statements)

References 9 publications

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“…As previous experimental studies demonstrated [25,26], the fragile failure mechanism of code conforming wide beam-column joints where damage and slip phenomena occurring to the beam rebars bonded out of the column core cause sudden strength decay and, as a consequence, a low displacement ductility ratio. Before setting up a new expensive experimental program to assess the feasibility of such an FRP-based strengthening intervention, a detailed numerical model by using the finite element software package ATENA 3D [27] has been developed.…”

Section: Introductionmentioning

confidence: 99%

FE Modelling of the Seismic Behavior of Wide Beam-Column Joints Strengthened with CFRP Systems

Santarsiero¹

2018

Buildings

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A large share of reinforced concrete (RC) framed buildings is provided with wide beams being a type of beam allowing greater freedom in the architectural arrangement of interiors, beyond further advantage due to fewer formworks needed during the construction. Nevertheless, little attention has been devoted to the seismic vulnerability of this kind of framed RC buildings as well as to the study of strengthening systems purposely developed for wide beams and wide beam-column connections. Under these premises, this paper proposes simple strengthening solutions made by Fibre Reinforced Polymers (FRP) systems able to effectively improve seismic capacity through feasible arrangement suitable in case a wide beam is present. On the basis of wide beam-column joints previously tested without strengthening system, detailed nonlinear finite element models were calibrated. Then, an FRP strengthening intervention based on a brand new arrangement was modeled in order to perform additional simulations under seismic actions. This way, the effectiveness of the strengthening intervention was assessed finding out that significant strength and ductility increments were achieved with a relatively simple and cheap strengthening arrangement. Additional research would be desirable in the form of experimental tests on the simulated wide beam-column joints.

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Section: Introductionmentioning

confidence: 99%

FE Modelling of the Seismic Behavior of Wide Beam-Column Joints Strengthened with CFRP Systems

Santarsiero¹

2018

Buildings

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“…Besides, the influence of temperature on the failure modality of stub CFST structural members could be referred to in Yan et al [99] (low temperature) and Lyu et al [97] (high temperature). Finally, Angelo et al [100] and Kulkarni et al [101] have tested and discussed about the failure of rectangular CFST structural members in junction with wide beam for earthquake engineering application. It is worth mentioning that only rectangular CFST columns (i.e., depth/width ratio greater than 1) were collected for investigation.…”

Section: Data Used and Selection Of Variablesmentioning

confidence: 99%

Optimization of Artificial Intelligence System by Evolutionary Algorithm for Prediction of Axial Capacity of Rectangular Concrete Filled Steel Tubes under Compression

Nguyen

Tran

et al. 2020

Materials

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Concrete filled steel tubes (CFSTs) show advantageous applications in the field of construction, especially for a high axial load capacity. The challenge in using such structure lies in the selection of many parameters constituting CFST, which necessitates defining complex relationships between the components and the corresponding properties. The axial capacity (P u ) of CFST is among the most important mechanical properties. In this study, the possibility of using a feedforward neural network (FNN) to predict P u was investigated. Furthermore, an evolutionary optimization algorithm, namely invasive weed optimization (IWO), was used for tuning and optimizing the FNN weights and biases to construct a hybrid FNN-IWO model and improve its prediction performance. The results showed that the FNN-IWO algorithm is an excellent predictor of P u , with a value of R 2 of up to 0.979. The advantage of FNN-IWO was also pointed out with the gains in accuracy of 47.9%, 49.2%, and 6.5% for root mean square error (RMSE), mean absolute error (MAE), and R 2 , respectively, compared with simulation using the single FNN. Finally, the performance in predicting the P u in the function of structural parameters such as depth/width ratio, thickness of steel tube, yield stress of steel, concrete compressive strength, and slenderness ratio was investigated and discussed.Materials 2020, 13, 1205 2 of 25 larger energy absorption capacity [7], convenient construction [11], economy of materials [12][13][14], and excellent seismic and refractory performance [15]. In particular, this type of structure can reduce the environmental burden by removing formwork [16], reusing steel pipes, and using high quality concrete with recycled aggregate [17]. The characteristics of CFST are that the steel material is located far from the central axis so the rigidity of the column is very large, and thus it also contributes to increasing the moment of inertia of the structure [5,18]. The ideal form of concrete core works against the compressive load and hinders the local buckling state of the steel pipe. Therefore, the CFST structures are often used in locations subject to large compressive loads [9,15,19]. The CFST columns are mainly divided into square columns, round columns, and rectangular columns, based on different cross-sectional forms [15]. In particular, the square and rectangular CFST columns have the advantage of easy connection and reliable work with other structural members such as beams, walls, and panels [20]. Compared with square CFST columns, rectangular columns have irregular bending stiffness along different axes, so this type of column is suitable for the mechanical behavior of members including arch ribs, pillars, abutments, and piers, and other structural members under load actions vary greatly from vertical to horizontal [6]. Because the scope of application of rectangular CFST columns is quite wide and this column is mainly subjected to compression, the main purpose of the paper is to analyze and evaluate the ultimate bearing capacity of...

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“…The maximum axial load considered and well documented in the form of shear strength equation is 0.42 f ′ c A g as in the case of Sarsam and Phillips (1985). Masi et al (2014) conducted experimental work on full-scale beam-column joints with wide beam to study the effect of axial load on the behavior of BCJ; the values of axial load ratio considered were 0.15 and 0.3. The results showed that the deformation and ductility are affected by the magnitude of column axial load.…”

Section: Introductionmentioning

confidence: 99%

Effects of Variation of Axial Load on Seismic Performance of Shear Deficient RC Exterior BCJs

Al‐Osta

Khan

Baluch

et al. 2018

Int J Concr Struct Mater

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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. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Influence of Axial Load on the Seismic Behavior of RC Beam-Column Joints with Wide Beam

Cited by 22 publications

References 9 publications

FE Modelling of the Seismic Behavior of Wide Beam-Column Joints Strengthened with CFRP Systems

FE Modelling of the Seismic Behavior of Wide Beam-Column Joints Strengthened with CFRP Systems

Optimization of Artificial Intelligence System by Evolutionary Algorithm for Prediction of Axial Capacity of Rectangular Concrete Filled Steel Tubes under Compression

Effects of Variation of Axial Load on Seismic Performance of Shear Deficient RC Exterior BCJs

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