Headed Bar Connections Between Precast Concrete Elements: Design Recommendations and Practical Applications

Vella, Jean Paul; Vollum, Robert L.; Kotecha, Raj

doi:10.1016/j.istruc.2018.06.008

Cited by 21 publications

(4 citation statements)

References 14 publications

(33 reference statements)

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“…In 2018, Vella et al [18] conducted a study on the design and behavior of the connections between precast concrete elements using overlapping headed bars. These are connections filled with cast-in concrete and can be used to solve the issue of the tensile and shear forces generated between hollow-core PC slabs and PC rim beams.…”

Section: Introductionmentioning

confidence: 99%

Shear Tests on Subassemblies Representing the Single-Anchored Connection between Precast Concrete Wall Panels and Reinforced Concrete Frames

Park,

Ha,

Song

et al. 2023

Buildings

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Many deformations occur in old RC structures, and the method of reinforcing them using PC members standardized and manufactured in the same mold has difficulty in coping with all deformations (construction error); as a solution to this, overlapping anchor shear connections consisting of three concrete segments have been proposed. This study proposes a special connection for strengthening existing reinforced concrete (RC) framed structures that are more than 30 years old with precast concrete (PC) members. The proposed overlapped anchor connection consists of two anchor groups installed in three concrete segments, which can accommodate deformation by adjusting the height of the concrete connection segment. In this study, the unique shear behavior of the overlapped anchor connection was investigated by analyzing the shear resistance of the single-anchor connection with one post-installed anchor and one cast-in anchor. Eleven specimens of anchored connection models were constructed and push-out tested, and the experimental parameters were analyzed. The shear strength of the single-anchor connection was calculated using a proposed design formula based on the American anchor design code, and the shear strength ratios of the experimental shear strengths to the calculated values were 0.93 on average. The proposed design formula can predict the shear behavior and expected effects of the proposed connection even in differing designs.

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Section: Introductionmentioning

confidence: 99%

Shear Tests on Subassemblies Representing the Single-Anchored Connection between Precast Concrete Wall Panels and Reinforced Concrete Frames

Park,

Ha,

Song

et al. 2023

Buildings

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“…The reinforcement had a diameter of 25 mm, and the headed bars were square-shaped with a side length of 70 mm. Based on both experimental and numerical results, a design procedure for headed bar joints was established using a model incorporating struts and tie rods [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Research on the Distributive Relationship between Bond Force and Bearing Pressure for Anchorage Force by Headed Bars

Miao,

Yang,

Zhou

et al. 2023

Buildings

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Anchorage force comprises bond force and bearing pressure when headed bars are used. Pull-out tests were conducted on 120 concrete specimens to derive a method for calculating the bond force for reinforcement in straight anchor sections at the yield moment. The parameters include the diameter d, embedded length lae, and yield strength fy of the reinforcement, as well as the strength grade of the concrete fcg. The experimental results indicated that the specimens underwent three failure modes depending primarily on the embedded length lae. The nominal average bond stress τu concept was proposed and the difference between τu and the actual average bond stress τ caused by the headed bars was observed. To reduce the difference between the τu and τ values, the correction coefficient γ was proposed. Analysis indicated that γ increased with an increase in the lae/d (on average, 146% higher than the initial value) and decreased with an increase in the fy/ft (on average, 33% less than the initial value). A formula was developed to calculate γ, and the bond force in the straight anchor sections at the yield moment for the reinforcement was determined. Thus, a distributive relationship was established for the anchorage force, the bond force, and the bearing pressure.

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“…By developing more trust in new materials such as fiber reinforced concrete and ultra-high-performance concrete through the successful experiments on their performance (Dadmand et al, 2020a,b;Pourbaba et al, 2018Pourbaba et al, , 2019, some researchers used these materials in their proposed connections (Deng et al, 2020). In recent studies, the application of post-tension tendons (Guan et al, 2019;Song et al, 2021), headed bars and headed studs (Vella et al, 2018) were also suggested. Most research on semimonolithic joints indicates their relatively good performance (Esmaeili and Ahooghalandary, 2019).…”

Section: Introductionmentioning

confidence: 99%

Cyclic tests on two novel welded flange plate connections in precast concrete moment resisting frames

Ahooghalandary

Esmaeili

Mirrezaei

2022

Advances in Structural Engineering

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Precast concrete moment resistant beam-to-column connections, usually designed in form of semi-monolithic connections which require in-situ concrete casting leading to a complicated assembling process. Additionally, using concrete with different ages in a connection causes cold joints and shrinkage problems. To overcome these issues, in this study, two steel beam-to-column connections (SBCs) were proposed and designed for precast concrete moment resisting frames. Compared to the semi-monolithic connections, proposed connections exclude protruding bars, resulting in a facile and rapid installation. Regarding the inverse T shape, these connections provide a better condition for installing the precast slabs and consequently reduce structural floor thickness. To evaluate the connections, two precast and one in-situ specimens were made and tested on a 2/3 scale and a cyclic load pattern was used to evaluate their performance. Test results indicate that the proposed SBCs have a maximum resistance and ductility until 1.5 and 0.9 times the in-situ concrete beam-to-column connection (ICBC), respectively. ACI374.1-05 criteria including strength and stiffness degradation ratio as well as energy dissipation ratio at drift 4% were employed to evaluate the qualification of the proposed connections. One of the proposed connections met all seismic requirements of ACI374.1-05. The plastic hinge locations were estimated by measuring the strains of rebars and steel parts of the connections. Results revealed that on the contrary to ICBC, the plastic hinge formation in proposed SBCs developed out of the beam-column joint which coincides with the strong-column and weak-beam principle in precast frames and postpones the total fracture mechanism of structure.

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Headed Bar Connections Between Precast Concrete Elements: Design Recommendations and Practical Applications

Cited by 21 publications

References 14 publications

Shear Tests on Subassemblies Representing the Single-Anchored Connection between Precast Concrete Wall Panels and Reinforced Concrete Frames

Shear Tests on Subassemblies Representing the Single-Anchored Connection between Precast Concrete Wall Panels and Reinforced Concrete Frames

Research on the Distributive Relationship between Bond Force and Bearing Pressure for Anchorage Force by Headed Bars

Cyclic tests on two novel welded flange plate connections in precast concrete moment resisting frames

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