In previous studies by the authors, a precast pre-stressed beam to column joint was developed to provide framed structures with stable dissipative response and resilience. However, the interaction between beam, column and RC slab, if not properly governed, could compromise the good features of the joint. In this paper, the RC slab is equipped with a special connection with the beam to column joint that protects it from damage caused by the cyclic joint rotation under earthquake excitation. The connection system contains two regions. The RC slab is detached from the beam in the region around the column, while it is constrained to the beam by U-shaped connectors in the other region. The deformation mode of the beam-column-slab with the proposed connection is studied and its cyclic response is investigated by experimental tests. Two 0.6 scaled specimens are tested to identify the parameters that influence the performance of joint and slab, namely, the length of the regions of the connection and the beam restriction in orthogonal direction. A finite element model of the beam to column joint with RC slab is developed in ABAQUS environment and is calibrated based on the results of the tests. Hence, it is used to perform a parametric investigation that leads to the values of the parameters that optimize the perfor-mance of joint and slab in terms of bearing capacity, energy dissipation, residual deformation and damage state of the slab. Finally, these values are incorporated within a general design procedure of the connection between RC slab and beam to column joint.

Optimal design of the connection between RC slab and precast pre-stressed beam to column joint

Barbagallo, F;Marino, EM;
2022-01-01

Abstract

In previous studies by the authors, a precast pre-stressed beam to column joint was developed to provide framed structures with stable dissipative response and resilience. However, the interaction between beam, column and RC slab, if not properly governed, could compromise the good features of the joint. In this paper, the RC slab is equipped with a special connection with the beam to column joint that protects it from damage caused by the cyclic joint rotation under earthquake excitation. The connection system contains two regions. The RC slab is detached from the beam in the region around the column, while it is constrained to the beam by U-shaped connectors in the other region. The deformation mode of the beam-column-slab with the proposed connection is studied and its cyclic response is investigated by experimental tests. Two 0.6 scaled specimens are tested to identify the parameters that influence the performance of joint and slab, namely, the length of the regions of the connection and the beam restriction in orthogonal direction. A finite element model of the beam to column joint with RC slab is developed in ABAQUS environment and is calibrated based on the results of the tests. Hence, it is used to perform a parametric investigation that leads to the values of the parameters that optimize the perfor-mance of joint and slab in terms of bearing capacity, energy dissipation, residual deformation and damage state of the slab. Finally, these values are incorporated within a general design procedure of the connection between RC slab and beam to column joint.
RC slab
Precast structure
Quasi -static test
FE analysis
Resilience
Design method
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/545161
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