Plastic Hinge Relocation Methods for Emulative PC Beam–Column Connections

Eom, Tae-Sung; Park, Hong-Gun; Hwang, Hyeon‐Jong; Kang, Su-Min

doi:10.1061/(asce)st.1943-541x.0001378

Cited by 79 publications

(31 citation statements)

References 9 publications

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“…To relocate the plastic hinge zone, it is required that the flexural strengths M nj and M nj ′ are respectively larger than the flexural demands M uj and M uj ′ at the column face, as shown in Figure

M_{nj} \geq M_{uj} and M_{nj}^{'} \geq M_{uj}^{'} .

…”

Section: Experimental Schemementioning

confidence: 99%

“…In addition, to prevent the frame from “strong‐beam‐weak‐column” failure, the flexural strength of the column M c should also comply with the requirements of “strong‐column‐weak‐beam”, as given in Equation :

M_{c} \geq 1.2 M_{uj} and M_{c} \geq 1.2 M_{uj}^{'} .

Furthermore, according to Eom et al, the distance between the relocated plastic hinge and the beam‐column interface must comply with Equation below:

h_{j} / d_{b} \geq 20,

where d b is the diameter of the rebars and h j is the effective embedment length, as defined in Figure . Based on Equations to , the tolerance for d j can be derived as follows:

d_{j} \leq min ({},,, ((), 1 - \frac{M_{normaln}}{M_{nj}}) l_{s}, ((), 1 - \frac{M_{normaln}^{'}}{M_{nj}^{'}}) l_{s}, ((), 1 - \frac{1.2 M_{n}}{M_{normalc}}) l_{s} ((), 1 - \frac{1.2 M_{n}^{'}}{M_{normalc}}) l_{s}),

d_{j} \geq ((), 20 d_{b} - h_{c}) / 2,

where h c is the column width as shown in Figure .…”

Section: Experimental Schemementioning

confidence: 99%

“…Furthermore, according to Eom et al, 21 the distance between the relocated plastic hinge and the beam-column interface must comply with Equation 4 below:…”

Section: Design Requirements For Detailingmentioning

confidence: 99%

“…In the published literature, many detailing techniques have been developed for improving the seismic or progressive collapse performances of RC frames, taken into consideration the significant values of a rational structural detailing to structural safety. Eom et al summarized different detailing techniques for the beam‐column joints by relocating the beam plastic hinges away from the beam‐column interface. The seismic performance of two strengthening methods using 90° hooked and headed bars, and a weakening method using reduced section bars, were experimentally compared with the conventional beam‐column joints.…”

Section: Introductionmentioning

confidence: 99%

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A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

Lin

et al. 2019

Earthq Engng Struct Dyn

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Summary Earthquake‐induced building collapse and progressive collapse due to accidental local failure of vertical components are the two most common failure modes of reinforced concrete (RC) frame structures. Conventional design methods usually focus on the design requirements of a specific hazard but neglect the interactions between different designs. For example, the progressive collapse design of an RC frame often yields increased reinforcement and flexural strength of the beams. As a result, the seismic design principle of “strong‐column‐weak‐beam” may be violated, which may lead to unfavorable failure modes and weaken the seismic performance. To avoid these adverse effects of the progressive collapse design on the seismic resistance of RC frames, a novel structural detailing is proposed in this study. The proposed detailing technique intends to concurrently improve the seismic and progressive collapse performances of an RC frame by changing the layout of the newly added longitudinal reinforcement against progressive collapse without introducing any additional reinforcement. A six‐story RC frame is used as the prototype building for this investigation. Both cyclic and progressive collapse tests are conducted to validate the performance of the proposed structural detailing. Based on the experimental results, detailed finite element (FE) models of the RC frame with different reinforcement layouts are established. The seismic and progressive collapse resistances of different models are compared based on the incremental dynamic analysis (IDA) and nonlinear dynamic alternate path (AP) methods, respectively. The results indicate that the proposed structural detailing can effectively resolve the conflict between the seismic and progressive collapse designs.

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M_{nj} \geq M_{uj} and M_{nj}^{'} \geq M_{uj}^{'} .

…”

Section: Experimental Schemementioning

confidence: 99%

M_{c} \geq 1.2 M_{uj} and M_{c} \geq 1.2 M_{uj}^{'} .

Furthermore, according to Eom et al, the distance between the relocated plastic hinge and the beam‐column interface must comply with Equation below:

h_{j} / d_{b} \geq 20,

where d b is the diameter of the rebars and h j is the effective embedment length, as defined in Figure . Based on Equations to , the tolerance for d j can be derived as follows:

d_{j} \leq min ({},,, ((), 1 - \frac{M_{normaln}}{M_{nj}}) l_{s}, ((), 1 - \frac{M_{normaln}^{'}}{M_{nj}^{'}}) l_{s}, ((), 1 - \frac{1.2 M_{n}}{M_{normalc}}) l_{s} ((), 1 - \frac{1.2 M_{n}^{'}}{M_{normalc}}) l_{s}),

d_{j} \geq ((), 20 d_{b} - h_{c}) / 2,

where h c is the column width as shown in Figure .…”

Section: Experimental Schemementioning

confidence: 99%

“…Furthermore, according to Eom et al, 21 the distance between the relocated plastic hinge and the beam-column interface must comply with Equation 4 below:…”

Section: Design Requirements For Detailingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

Lin

et al. 2019

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The connection experimentally behaved better in terms of flexural strength, cracking, ductility, and energy dissipation than CIP specimens. Eom et al strengthened beams by employing 90° hooked beam bars and headed bars, respectively, and weakened beams by reducing the bar sections to relocate the plastic hinges away from column faces. Experimental study on the cruciform beam–column connections showed that the employed relocation methods successfully enhanced the seismic performance by significantly easing slip along the longitudinal beam reinforcement and joint shear cracking.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on effect of length of service hole on seismic behavior of exterior precast beam–column connections

Liu

Cai

Deng

et al. 2018

Structural Concrete

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Experimental study is reported on the seismic behavior of a type of exterior beamcolumn connections, which feature service holes in the connecting ends of the beams. Specimens with three typical lengths of the holes (450, 500, and 400 mm) are tested under quasi-static reversed cyclic loading with constant axial compression on columns. Failure modes, hysteretic and skeleton curves, energy dissipation capacity and ductility are investigated and effect of the length of the hole on the seismic behavior of the connection is studied. The results reveal satisfactory seismic performance of the connections with plastic hinges developed at the connecting ends of the beams and no damage to the joint regions. Comparisons between the specimens demonstrate that the connection with 500-mm long hole performs the greatest energy dissipation capacity and the greatest ductility with comparable load-carrying capacity to the connection with 400-mm long hole. Finally, it is feasible and reliable to follow the Chinese code to predict the load-carrying capacity of the connection, when the longitudinal reinforcement is symmetrically arranged. K E Y W O R D Sbeam-column connection, cyclic load, precast concrete, seismic behavior, test, U-shape

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Design and commissioning of novel test apparatus for underground structures and its application in seismic damage testing of prefabricated subway station

Chen,

Xu,

et al. 2024

Earthq Engng Struct Dyn

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This paper presents the design and commissioning of a novel pseudo‐static test apparatus for underground structures that accounts for soil‐structure interaction by simulating the soil with suitably designed springs. The developed apparatus was employed to conduct 1:10 large scale tests on a two‐story three‐span prefabricated subway station structure. Two comparative cyclic load tests were conducted: one involved the developed springs‐structure system; and one involved the structure alone (no springs). The test results demonstrated important differences in the damage location, damage degree, bearing capacity, and deformation capacity of the prefabricated subway station structure under the two loading conditions (i.e., with and without springs). The presence of springs (i.e., soil‐structure interaction) enhanced the lateral collapse resistance of the underground structure and affected the inter‐story displacement ratio (IDR) between the upper and lower layers of the two‐story prefabricated subway station structure. However, it did not affect the deformation coordination of the walls and columns of each layer. A finite element model of the prototype station was also established to conduct dynamic time history analysis simulating the soil‐structure interaction. The results from the dynamic analysis validated the effectiveness of the pseudo‐static test method employing the spring‐structure system. The excellent agreement between the calculated dynamic responses and the responses obtained from the pseudo static tests confirmed the ability of the developed apparatus to conduct seismic tests on complex large‐scale underground structures such as prefabricated subway stations. Thus, this test methodology might be utilized to attain valuable insights into the seismic performance of prefabricated subway stations at a relatively low cost and effort.

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Plastic Hinge Relocation Methods for Emulative PC Beam–Column Connections

Cited by 79 publications

References 9 publications

A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

Experimental study on effect of length of service hole on seismic behavior of exterior precast beam–column connections

Design and commissioning of novel test apparatus for underground structures and its application in seismic damage testing of prefabricated subway station

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