Seismic Testing of the Slotted Beam Detail for Reinforced Concrete Structures

Muir, C.A.; Bull, D.K.; Pampanin, Stefano

doi:10.1061/9780784412848.228

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…The beam–column connection design adopted in this study is a partial depth slot (i.e., gap) introduced between the beam and the column to control damage. The slotted beam connection system experiences minimal beam elongation and achieves a non-tearing action under seismic loading [ 23 , 24 ]. The specimen was tested at the structural laboratory of the Pacific Earthquake Engineering Research (PEER) Center of UC Berkeley under quasi-static cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Distributed Fiber-Optic Strain Sensing of an Innovative Reinforced Concrete Beam–Column Connection

Zhang

Liu

Darwish

et al. 2022

Sensors

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Distributed fiber-optic sensing (DFOS) technologies have been used for decades to detect damage in infrastructure. One recent DFOS technology, Optical Frequency Domain Reflectometry (OFDR), has attracted attention from the structural engineering community because its high spatial resolution and refined accuracy could enable new monitoring possibilities and new insight regarding the behavior of reinforced concrete (RC) structures. The current research project explores the ability and potential of OFDR to measure distributed strain in RC structures through laboratory tests on an innovative beam–column connection, in which a partial slot joint was introduced between the beam and the column to control damage. In the test specimen, fiber-optic cables were embedded in both the steel reinforcement and concrete. The specimen was tested under quasi-static cyclic loading with increasing displacement demand at the structural laboratory of the Pacific Earthquake Engineering Research (PEER) Center of UC Berkeley. Different types of fiber-optic cables were embedded both in the concrete and the rebar. The influence of the cable coating and cable position are discussed. The DFOS results are compared with traditional measurements (DIC and LVDT). The high resolution of DFOS at small deformations provides new insights regarding the mechanical behavior of the slotted RC beam–column connection, including direct measurement of beam curvature, rebar deformation, and slot opening and closing. A major contribution of this work is the quantification of the performance and limitations of the DFOS system under large cyclic strains. Performance is quantified in terms of non-valid points (which occur in large strains when the DFOS analyzer does not return a strain value), maximum strain that can be reliably measured, crack width that causes cable rupture, and the effect of the cable coating on the measurements. Structural damage indices are also proposed based on the DFOS results. These damage indices correlate reasonably well with the maximum sustained drift, indicating the potential of using DFOS for RC structural damage assessment. The experimental data set is made publicly available.

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Section: Introductionmentioning

confidence: 99%

Distributed Fiber-Optic Strain Sensing of an Innovative Reinforced Concrete Beam–Column Connection

Zhang

Liu

Darwish

et al. 2022

Sensors

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“…Byrne et al (2012), and C. A. Muir et al (2013) tested slotted-beam connections and frames and verified that the slotted-beam structures had good seismic performance. Additionally, Oudah (2013) tested numerous specimens of slottedbeam connections to examine the effects of the vertical slot position on the seismic performance and damage to the connection.…”

Section: Introductionmentioning

confidence: 83%

A novel precast concrete beam-to-column connection with replaceable energy-dissipation connector: Experimental investigation and theoretical analysis

Tong

2021

Bull Earthquake Eng

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In order to avoid the damage of the connection due to the overstrength of beam strength, and the alternation of the strength hierarchy in the structural system. The additional bending moment produced by the combined action of the pressure generated by the concrete compression zone and the tension generated by the reinforcements needs to be reduced. A novel precast concrete beam-column connection is proposed herein. In the proposed connection, the precast beam is laid on a steel corbel embedded in the precast column. A novel replaceable energydissipation connector (REDC) is placed at the bottom of the steel corbel, which ensures that it is in the same horizontal position aligned with the longitudinal reinforcement at the bottom of the connection. In addition, there is a narrow vertical slot adjacent to the column face. The total yield capacity of the top reinforcement is larger than that of the bottom REDC energy-dissipation connector. Theory study focused on the structural features and mechanical mechanism of this novel precast connection. Three low-cycle quasi-static loading tests were carried out on a single full-2 scaled specimen by replacing three REDCs with different sizes. The cracking pattern of this novel precast connection, and the effects of different parameters of the REDCs on the energy-dissipation capacity and load capacity of the connections were discussed. By performing a finite-element simulation, a method for reducing the additional bending moment and keeping the top reinforcements always in elastic was developed. In addition, the relevant design suggestions were provided. The conclusion shows that the seismic performance of this novel precast concrete beamcolumn connection is excellent. The positive and negative bending moments of novel precast concrete beam-column connection both reduce the additional bending moment. In view of this, the bending moment of the novel connection is a controllable variable.

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“…Fewer and smaller cracks were also observed in the slotted system when compared to conventional connections. In phase II, two portions of the superassembly specimen were extracted for further testing after Phase one testing was completed [33,34]. There were three reasons for putting these to the test.…”

Section: Research Progress In the Behavior Of Slotted Reinforced Conc...mentioning

confidence: 99%

Slotted Reinforced Concrete Beam-Column Connection: State-of-the-Art Review

Sakr

Khalifa

Soliman

2022

Journal of Engineering Research

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Research on reinforced concrete (RC) beam-column connections has significantly increased during the past few decades. Interest in this topic is related to the importance of beam-column connections in maintaining the integrity of the whole structure. The slotted RC beam-column connection was investigated as a promising low damage beam-column connection replacement for conventional design. A slotted RC beam consists of a conventional RC beam, modified with a narrow vertical slot adjacent to the face of the column that runs approximately threequarters of the beam depth. This study reviews the literature on the mechanics and design of slotted beams, illustrating the works of various researchers on developing and modifying this innovative system. Then, the research progress in the behavior of slotted RC beams is briefly described, in chronological order, to place each contribution in a wider context. Extremely promising structural performance was observed due to minimum beam elongation, non-tearing action, minimum cracks, high energy dissipation, and stable hysteresis response. At the end of the study, a list of the main gaps that need further investigation and recommendations to fill out these gaps are provided.

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Seismic Testing of the Slotted Beam Detail for Reinforced Concrete Structures

Cited by 10 publications

References 6 publications

Distributed Fiber-Optic Strain Sensing of an Innovative Reinforced Concrete Beam–Column Connection

Distributed Fiber-Optic Strain Sensing of an Innovative Reinforced Concrete Beam–Column Connection

A novel precast concrete beam-to-column connection with replaceable energy-dissipation connector: Experimental investigation and theoretical analysis

Slotted Reinforced Concrete Beam-Column Connection: State-of-the-Art Review

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