Hysteretic behavior of exterior post-tensioned flat plate connections

Han, Sang Whan; Kee, Seong‐Hoon; Park, Young-Mi; Lee, Li-Hyung; Kang, Thomas H.‐K.

doi:10.1016/j.engstruct.2006.03.029

Cited by 28 publications

(14 citation statements)

References 2 publications

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“…The detail information on these specimens is available in Han et al (2006aHan et al ( , 2006bHan et al ( , 2009). Figure 7 shows the hysteretic behaviour of slab-column connection specimens PI-D30, PI-D50, PI-D50X and PE-D50 obtained from the numerical analyses and experiments.…”

Section: Pt Slab-column Connectionsmentioning

confidence: 99%

“…The hysteretic behaviour of the PT slab-column connections reported by Han et al (2006aHan et al ( , 2006bHan et al ( , 2009) is simulated by using the numerical connection model developed by this study. Software OpenSees (2007) is used.…”

Section: Pt Slab-column Connectionsmentioning

confidence: 99%

“…Previous studies (Han et al, 2006a(Han et al, , 2006b(Han et al, , 2009MartinezCruzado, 1993;Qaisrani, 1993) reported that a slab sagging moment could occur at PT slab-column connections under lateral force associated with design earthquake specified in current seismic design provisions; therefore, sufficient slab bottom reinforcement must be placed to avoid the formation of large cracks. Han et al (2009) demonstrated that slab bottom reinforcement passing through the column placed in accordance with ACI-ASCE 352 R.1 (ACI-ASCE Joint Committee 352, 1997) is effective in resisting unexpected sagging moments at PT slabcolumn connections.…”

Section: Introductionmentioning

confidence: 97%

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Effect of slab bottom reinforcement on seismic performance of post-tensioned flat plate frames

Han¹,

Moon

Park

2012

Magazine of Concrete Research

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Young-Mi ParkChief Engineer, Doosan Engineering and Construction Company, South KoreaThe purpose of this study is to evaluate the seismic performance of gravity-designed post-tensioned flat plate frames with and without slab bottom reinforcement passing through the column. In low and moderate seismic regions, the seismic demands may not control the design, and buildings are often designed considering only gravity loads. This study focuses on the seismic performance of gravity load designed post-tensioned flat plate frames. For this purpose, three-, six-and nine-storey post-tensioned flat plate frames are designed considering only gravity loads. For reinforced concrete flat plate frames, continuous slab bottom reinforcement (integrity reinforcement) passing through the column should be placed to prevent progressive collapse; however, for the post-tensioned flat plate frames, the slab bottom reinforcement is often omitted since the requirement for the slab bottom reinforcement for post-tensioned flat plates is not clearly specified in ACI 318-05. This study evaluates the seismic performance of the model frames by conducting non-linear static pushover analyses and non-linear response history analyses. For conducting non-linear response history analyses, six sets of ground motions are used as input ground motions, which represent two different hazard levels (return periods of 475 and 2475 years) and three different locations (Boston, Seattle and Los Angeles). An analytical model is developed for emulating the non-linear hysteretic behaviour and the failure mechanism of post-tensioned slab-column connections. This study shows that gravity-designed posttensioned flat plate frames have some seismic resistance. In addition, the seismic performance of post-tensioned flat plate frames is significantly improved by placing slab bottom reinforcement to pass through the column.

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Section: Pt Slab-column Connectionsmentioning

confidence: 99%

Section: Pt Slab-column Connectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Effect of slab bottom reinforcement on seismic performance of post-tensioned flat plate frames

Han¹,

Moon

Park

2012

Magazine of Concrete Research

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“…The second test specimen (EXPT-2) differed from the first only in terms of tendon spacing (Figure 10). The outer tendons were brought much closer to the column in order to minimise the effects of 'shear lag' , while also investigating the effect of increased precompression being placed on the joint (thought to reduce overall ductility of the connection, as shown in research by Han et al (2006)). …”

Section: Prototype and Test Specimen Designmentioning

confidence: 99%

Exterior post-tensioned band beam to column connections under earthquake loading

Davey

Abdouka

Al-Mahaidi

2016

Australian Journal of Structural Engineering

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Although post-tensioned wide band beams are an extremely common structural floor system in Australia, very little is known about their performance under seismic loading. This study presents the results of two half-scale exterior post-tensioned wide band beam to column connections under seismic loading. The specimens were designed and detailed in accordance with current Australian practice to AS 3600-2009 to resist gravity loading only. The first specimen had tendons evenly distributed throughout the beam width, while the second specimen had the outer tendons moved much closer to the column side face. Both specimens performed similarly and torsional damage to the edge beam was critical. Both specimens achieved drifts of 3.0% or higher prior to significant loss in capacity, which is greater than the imposed maximum drift limit in most design codes. A 3D finite element parametric analysis was undertaken using the experimental results to calibrate the model. In addition to ensuring all reinforcement is properly anchored, this analysis confirmed the importance of the edge beam in the behaviour of the overall connection. Providing closed ligatures in the edge beam to the side face of the column was found to be critical to ensuring overall ductility of the connection, as well as minimising additional torsion placed on the edge beam by concentrating reinforcement within the column width where possible.

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“…After the compounds have completed their transformation to ettringite, a longer term reaction of the belite (b-C 2 S, dicalcium silicate) phase into C-S-H continues for months (Ost 1975). Recently, newer technologies such as the use of CSA cement are increasingly popular for post-tensioned concrete floor structures because of the shrinkage-compensating characteristics and other advantages (Han et al 2006;Kang et al 2009;Yang and Kang 2011;Bondy 2011;Jeon et al 2015;Lee et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Pore Structure of Calcium Sulfoaluminate Paste and Durability of Concrete in Freeze–Thaw Environment

Bruyn

Bescher

Ramseyer

et al. 2016

Int J Concr Struct Mater

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Mercury intrusion and nitrogen sorption porosimetry were employed to investigate the pore structure of calcium sulfoaluminate (CSA) and portland cement pastes with cement-to-water ratio (w/c) of 0.40, 0.50, and 0.60. A unimodal distribution of pore size was drawn for CSA cement pastes, whereas a bimodal distribution was established for the portland cement pastes through analysis of mercury intrusion porosimetry. For the experimental results generated by nitrogen sorption porosimetry, the CSA cement pastes have a smaller and coarser pore volume than cement paste samples under the same w/c condition. The relative dynamic modulus and percentage weight loss were used for investigation of the concrete durability in freeze-thaw condition. When coarse aggregate with good freeze-thaw durability was mixed, air entrained portland cement concrete has the same durability in terms of relative dynamic modulus as CSA cement concrete in a freeze-thaw environment. The CSA cement concrete with poor performance of durability in a freeze-thaw environment demonstrates the improved durability by 300 % over portland cement concrete. The CSA concrete with good performance aggregate also exhibits less surface scaling in a freeze-thaw environment, losing 11 % less mass after 297 cycles.

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Hysteretic behavior of exterior post-tensioned flat plate connections

Cited by 28 publications

References 2 publications

Effect of slab bottom reinforcement on seismic performance of post-tensioned flat plate frames

Effect of slab bottom reinforcement on seismic performance of post-tensioned flat plate frames

Exterior post-tensioned band beam to column connections under earthquake loading

Pore Structure of Calcium Sulfoaluminate Paste and Durability of Concrete in Freeze–Thaw Environment

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