Experimental investigation of hybrid mechanical joints for L-shaped columns replacing conventional grouted sleeve connections

Nzabonimpa, J.D.; Hong, Won‐Kee

doi:10.1016/j.engstruct.2019.01.123

Cited by 15 publications

(34 citation statements)

References 18 publications

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“…Embedded elements, including L-shaped steels, rebars, and hoops were located inside host elements (upper and lower concrete columns) in present FE models, as shown in Figure 3. As described in a previous study of authors (Nzabonimpa and Hong 2019) and…”

Section: Defining Constraints and Materials Propertiesmentioning

confidence: 95%

“…However, joints for rectangular precast frames explored by these researchers do not fit into the connection of irregular precast columns that have an "L" shape as suggested by the present authors. Both experimental investigations of L-shaped dry mechanical joints to splice precast concrete frames were presented in (Hong 2019;Nzabonimpa and Hong 2019). In the present study, laminated mechanical plates were implemented in the design of a 20-story apartment building shown in Figure 1, replacing conventional wet precast connections such as sleeves.…”

Section: Motivation and The Significance Of The Studymentioning

confidence: 99%

“…(3) Fabrication of steel column with metal column plate (Nzabonimpa, and Hong 2019) (b) Nuts installed in the pit of column plates sufficient to encompass the height of one nut is used in this type; however, costs for bending all vertical rebars are required. In Figure 5(b)-(1) to 5(b)-(3) (Nzabonimpa, Hong, and Kim,2017a) with a pit type of connection, nuts threaded with rebars are accommodated in the counterbores of column plates without using a filler plate.…”

Section: Details Of the Connection Between Steel Plate And Rebarsmentioning

confidence: 99%

“…These displacements were created by an actuator. Gauges were installed on columns to measure strains of concrete, rebars, steel, and plates (Nzabonimpa and Hong 2019). Figure 13(c) shows test set-up of beam-column joint.…”

Section: Test Set-upmentioning

confidence: 99%

“…Test results of L-shaped dry mechanical joints splicing precast concrete frames can be found in our past work (Nzabonimpa and Hong 2019;Hong 2019). Constitutive relationships of embedded elements (L-shaped steels, rebars) were determined based on elastic-plastic property and constitutive relationships defined by elastic-softening behavior were utilized for interior stiffeners (headed studs).…”

Section: (1) Column-column Testmentioning

confidence: 99%

See 4 more Smart Citations

Strain evolution of mechanical joints for L-shaped precast columns Part II: Application to a tall building

Nguyen

Hong

Kim

2021

Journal of Asian Architecture and Building Engineering

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This study succeeded in an experimental investigation of the authors' previous studies in which L-shaped dry mechanical joints were developed and tested to demonstrate applicability to precast concrete frames. In their early study, the use of L-shaped dry mechanical joints assembling precast concrete frames was veri fied both experimentally, demonstrating all structural components at joint experimentally functioned well, supporting both cyclic and monolithic loads. In the present study, design recommendations and collateral benefits were provided to design tall building frames based on an extensive strain analysis, while improving joints using interior stiffeners to greatly enhance the structural performance of mechanical joints. How fast strains of joints are developed as deflections progressed was also explored based on rates of strain increase relative to deflection, while identifying degradation mechanism of mechanical joints (including rebars and steel sections attached to mechanical plates) that led to brittle failure modes. This study aims to provide design protocol for a 20-story apartment building with L-shaped precast columns spliced by mechanical plates. Beamcolumn joints were assembled by extended beam endplates, which were bolted to plates embedded in columns. A sufficient beam depth was determined by avoiding stress concentration exerted by extended beam endplates.

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Section: Defining Constraints and Materials Propertiesmentioning

confidence: 95%

Section: Motivation and The Significance Of The Studymentioning

confidence: 99%

Section: Details Of the Connection Between Steel Plate And Rebarsmentioning

confidence: 99%

Section: Test Set-upmentioning

confidence: 99%

Section: (1) Column-column Testmentioning

confidence: 99%

See 3 more Smart Citations

Strain evolution of mechanical joints for L-shaped precast columns Part II: Application to a tall building

Nguyen

Hong

Kim

2021

Journal of Asian Architecture and Building Engineering

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Seismic Performance of a Full-Scale Precast Concrete L-Shaped Column Frame Structure with a Grouted Connection

Qiao

Sun

et al. 2021

KSCE J Civ Eng

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Precast concrete frame structure with nonrectangular columns are becoming attractive to researchers and engineers owing to advantages such as avoiding column protrusion from walls and saving space. This paper presents the experimental investigation of a full-scale precast concrete frame structure with L-shaped columns (PCFS) subjected to reverse cyclic loading. The precast connection adopted grouted anchor connection. As a comparison and benchmark, one full-scale monolithic sample (RCFS) was also tested. The results indicates that the greater steel ratio in the grouted anchor connection region leads to a high local stiffness of the elements, which contributed to delaying occurrence of the first crack at the grouting holes. The failure mode, lateral load capacity, stiffness degradation, load-carrying capacity degradation, energy-dissipating capacity, ductility and interlayer residual deformation were compared between two specimens. PCFS specimen exhibited comparatively better hysteretic behavior, energy-dissipating capacity, residual deformation-resisting capacity and ductility. For RCFS and PCFS specimens, the peak load difference was within 7%. About 15% increases in ductility were observed for PCFS specimen compared with RCFS specimen. The test results would provide reference for the application of the precast concrete structure with nonrectangular columns in the new residential buildings.

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L-type hybrid precast frames with mechanical joints using laminated metal plates

Hong¹

2020

Hybrid Composite Precast Systems

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Experimental investigation of hybrid mechanical joints for L-shaped columns replacing conventional grouted sleeve connections

Cited by 15 publications

References 18 publications

Strain evolution of mechanical joints for L-shaped precast columns Part II: Application to a tall building

Strain evolution of mechanical joints for L-shaped precast columns Part II: Application to a tall building

Seismic Performance of a Full-Scale Precast Concrete L-Shaped Column Frame Structure with a Grouted Connection

L-type hybrid precast frames with mechanical joints using laminated metal plates

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