Semi-empirical model for shear strength of RC interior beam-column joints subjected to cyclic loads

Pauletta, Margherita; Marco, Caterina Di; Frappa, Giada; Somma, Giuliana; Pitacco, Igino; Miani, Marco; Das, Sreekanta; Russo, Gianpiero

doi:10.1016/j.engstruct.2020.111223

Cited by 31 publications

(7 citation statements)

References 23 publications

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“…The axial compressive load is a key factor for evaluating the seismic performance of column beam joints [30]. Figure 12 exhibits the skeleton curves, load capacity, ductility, and energy dissipation of the joints.…”

Section: Effect Of Axial Load Ratiomentioning

confidence: 99%

Study of the Seismic Behavior of Simplified RCS Joints via Nonlinear Finite Element Analysis

Li,

Wang,

Lin

et al. 2023

Buildings

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Compared to more complex structures, simply configured reinforced concrete column–steel beam (RCS) composite structures have more promising application prospects, especially in regions with moderate–high seismic levels, due to their ease of construction. However, the current understanding of the seismic performance of simplified RCS joints is not sufficient. Validated by experimental results, a nonlinear finite element analysis (FEA) model was developed in this study to reveal the seismic behavior of simplified RCS joints. Six vital design parameters, namely axial load ratio, concrete strength, yield strengths of steel webs and flanges, and diameters of transverse and longitudinal reinforcements, were comprehensively studied. Research has shown that the axial compression ratio has a significant impact on the failure mode and bearing capacity of joints. When the concrete strength increases, the load-bearing capacity of the joints significantly increases, while the brittleness of high-strength concrete leads to a decrease in its deformation capacity. In addition, when the steel beam strength is constant, higher flange and web yield strengths have a limited influence on crack propagation and strain development. The stirrup reinforcement ratio and longitudinal reinforcement ratio play a significant role in inhibiting crack propagation and improving the bearing capacity, respectively. With the help of the numerical results, six theoretical models introduced by national codes and other researchers were compared. Among them, the modified model proposed by Kanno demonstrated the highest accuracy and was the most suitable for simply configured RCS joints.

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Section: Effect Of Axial Load Ratiomentioning

confidence: 99%

Study of the Seismic Behavior of Simplified RCS Joints via Nonlinear Finite Element Analysis

Li,

Wang,

Lin

et al. 2023

Buildings

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“…The internal forces acting on the face of the joint core because of the applied seismic forces can be demonstrated, as given in Figure 1b. In Figure 1b, the "T s2 " is the compression force (C') in the beam section on the opposite side of the joint, but using the horizontal equilibrium equation to the beam cross-section gives C' = T s2 [43]. Therefore, T s2 is directly put in the equation by replacing C' with T s2 .…”

Section: Experimental Joint Shear Strengthmentioning

confidence: 99%

Development of an Analytical Model for the FRP Retrofitted Deficient Interior Reinforced Concrete Beam-Column Joints

et al. 2022

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Beam-column joints (BCJs) constructed until the 1970s carry a low shear capability due to the absence of shear reinforcement. Fiber-reinforced polymers (FRP) are more reliable than other materials to strengthen a weak BCJ. To date, plenty of analytical models have been developed to analyze the actual contribution of the FRP to the shear strength of RC BCJs. However, the models developed are either too complex in computational efforts or based on empirical coefficients that result in compromised results. The models that formulate the contribution of FRP to the shear strength of the FRP-strengthened deficient interior BCJ are very limited, and such models are too complex. An adequate BCJs’ FRP strain equation must still be developed to address these issues. Therefore, the FRP effective strain equation and contribution of FRP to RC BCJs are derived in this research work using an updated database of the appropriate BCJs. The initial analytical model of Bousselham, which Del Vecchio later improved, is further extended to FRP-strengthened deficient interior BCJs. For this purpose, an updated database of the 32 tests around the world of FRP-strengthened interior BCJs deficient in seismic reinforcement is prepared. Firstly, the experimental effective FRP strain is derived using the experimental database. Then, a power-type equation is derived for the effective FRP strain by considering the crucial parameters of the FRP-strengthened interior BCJs. Finally, the experimental shear strengths and those determined with the proposed equation of the FRP-strengthened joints are compared. The average ratio between the experimental and analytical (proposed model) joint shear strengths of the considered specimens ensured the accuracy of the suggested model. The suggested approach makes computing the FRP enhancements required to avoid shear failure in interior joints easy and reliable for researchers and field engineers interested in seismically reinforcing existing structures.

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“…Another lack of balance in the literature that must be highlighted is that most of the papers about anchors present experimental research works [3,9,11,20,22,[24][25][26][27][28][31][32][33][34][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51], empirical formulations [4,10,13,14,20,26,33,40,44,45,[52][53][54][55][56][57], and numerical analyses [3,32,35,36,[58][59]…”

Section: Gaping Absence In Literature About the Shear Anchormentioning

confidence: 99%

Shear Strength of an Anchor Post-Installed into a Hardened Concrete Member

Foraboschi

2022

SSRN Journal

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Semi-empirical model for shear strength of RC interior beam-column joints subjected to cyclic loads

Cited by 31 publications

References 23 publications

Study of the Seismic Behavior of Simplified RCS Joints via Nonlinear Finite Element Analysis

Study of the Seismic Behavior of Simplified RCS Joints via Nonlinear Finite Element Analysis

Development of an Analytical Model for the FRP Retrofitted Deficient Interior Reinforced Concrete Beam-Column Joints

Shear Strength of an Anchor Post-Installed into a Hardened Concrete Member

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