Ductile Connections in Precast Concrete Moment Resisting Frames

Ertas, Onur; Özden, Şevket; Özturan, Turan

doi:10.15554/pcij.05012006.66.76

Cited by 107 publications

(46 citation statements)

References 14 publications

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“…Performance of reduced scaled and full scaled dry and wet precast exterior beam column connections were evaluated by conducting experiments under reversed cyclic loading (Vidjeapriya & Jaya, 2012Ertas et al 2006;Joshi et al, 2005). Different means for precast beam column connections were adopted such as connection using dowel bar, dowel bar with cleat angles, cleat angles with single stiffener and double stiffener, tie rod and steel plates, use of cast in place concrete in beam and column, composite connection with welding, bolted connections etc.…”

Section: Literature Surveymentioning

confidence: 99%

Experimental Study on Precast Beam Column Connections Constructed Using RC Corbel and Steel Billet under Progressive Collapse Scenario

Nimse¹,

Joshi²,

Patel³

2015

Structures Congress 2015

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Progressive collapse denotes a failure of a major portion of a structure that has been initiated by failure of a relatively small part of the structure such as failure of any vertical load carrying element (typically columns). Failure of large part of any structure will results in to substantial loss of human lives and natural resources. Therefore, it is important to prevent progressive collapse which is also known as disproportionate collapse. Now a days, there is increasing trend towards construction of buildings using precast concrete. In precast concrete construction, all the components of structures are produced in controlled environment and they are being connected appropriately at site. Connections are the most critical elements of any precast structure, because in past major collapse of precast structure took place because of connection failure. In this study, behavior of four different reduced 1/3 rd scaled precast specimens having wet and dry connections is investigated under column removal scenario and their performance is compared with monolithic connection. Precast specimens considered for the study are constructed by adopting different detailing having column with RC corbel and column with steel billet for connection with precast beam. Performance of specimen is evaluated on the basis of ultimate load carrying capacity, maximum deflection and deflection measured along the span of the beam. From the results, better performance of precast connections is observed up to elastic phase but later on strength of dry precast connections degrades more as compared to monolithic connection. Wet precast connections exhibit superior performance as compared to monolithic connection, which advocates replacement of monolithic connection with appropriate connection detailing. From the results, is also observed that precast connections constructed using RC corbel performs better as compared to those constructed using steel billet. Structures Congress 2015 1101

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Section: Literature Surveymentioning

confidence: 99%

Experimental Study on Precast Beam Column Connections Constructed Using RC Corbel and Steel Billet under Progressive Collapse Scenario

Nimse¹,

Joshi²,

Patel³

2015

Structures Congress 2015

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“…Experimental studies on post-tensioned connections showed that increase in mild reinforcement ratio results in improved ductility and energy dissipation capacities. However, in some cases premature buckling and rupture of mild reinforcement may occur before reaching the drift ratios that the connection can sustain (Cheok et al 1993;Priestley et al 1999;ACI T1.2 2003;Ertas et al 2006). It is proposed that, unbonding of reinforcing bars over a length of precast beam and column elements in a sleeve can reduce the strain demands and prevent rupture which leads significant degradation in strength (Cheok et al 1996;Pampanin et al 2001;Belleri et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…However, there are a limited number of experimental studies on the behavior of hybrid (emulativewelded) connections in the literature. Ertas et al (2006) tested half-scaled one exterior beam-column connection where the first diagonal crack near the connection was reported at 2.2% drift ratio and the beam bottom rebars ruptured at the first cycle of 3.5% drift ratio. Yuksel et al (2015) tested five half-scaled exterior hybrid connections including a slab which are subjected to monotonic and cyclic drifts applied at the beam tip.…”

Section: Introductionmentioning

confidence: 99%

Experimental Cyclic Behavior of Precast Hybrid Beam-Column Connections with Welded Components

Girgin

Mısır

Kahraman

2017

Int J Concr Struct Mater

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Post-earthquake observations revealed that seismic performance of beam-column connections in precast concrete structures affect the overall response extensively. Seismic design of precast reinforced concrete structures requires improved beamcolumn connections to transfer reversed load effects between structural elements. In Turkey, hybrid beam-column connections with welded components have been applied extensively in precast concrete industry for decades. Beam bottom longitudinal rebars are welded to beam end plates while top longitudinal rebars are placed to designated gaps in joint panels before casting of topping concrete in this type of connections. The paper presents the major findings of an experimental test programme including one monolithic and five precast hybrid half scale specimens representing interior beam-column connections of a moment frame of high ductility level. The required welding area between beam bottom longitudinal rebars and beam-end plates were calculated based on welding coefficients considered as a test parameter. It is observed that the maximum strain developed in the beam bottom flexural reinforcement plays an important role in the overall behavior of the connections. Two additional specimens which include unbonded lengths on the longitudinal rebars to reduce that strain demands were also tested. Strength, stiffness and energy dissipation characteristics of test specimens were investigated with respect to test variables. Seismic performances of test specimens were evaluated by obtaining damage indices.

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“…Senel and Kayhan [10] conducted a case study to explore precast building fragility based on damage assessment using non-linear time history analysis. Ertas et al [11] carried out a series of tests. In these tests, many models were developed and investigated using cast-in-place concrete in the beamcolumn connection.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on a Proposed Moment-Resisting Connection for Precast Concrete Frames

et al. 2017

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Abstract. This paper presents the test results of a proposed ductile moment-resisting beam-column connection for precast concrete frames and a developed 3D nonlinear niteelement model of this connection featuring several di erent details to predict its behavior under cyclic loading based on the loading of ACI T1.1-01. In this connection, precast concrete beam and column are connected to each other by steel linkage element. This method is able to create concrete structures of higher quality by minimizing in-situ concreting, maximizing the speed of construction, and using ductile and exchangeable elements in sensible locations of the connection. Two types of bolted and welded connections were compared with the monolithic connection in terms of sti ness, strength, energy dissipation capacity, and ductility factor. All specimens satis ed all criteria of ACI T1.1-01. To investigate the behavior of these connections, a 3D nonlinear nite-element model was simulated. Numerical results showed good agreement with experimental results. The initial sti ness of monolithic connection specimen was greater than that of bolted connection and welded connection specimens. Even though the beam's moment capacity of the two welded and bolted samples was slightly more than that of monolithic sample, the ductility factors in these samples were slightly less than those in monolithic sample.

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Ductile Connections in Precast Concrete Moment Resisting Frames

Cited by 107 publications

References 14 publications

Experimental Study on Precast Beam Column Connections Constructed Using RC Corbel and Steel Billet under Progressive Collapse Scenario

Experimental Study on Precast Beam Column Connections Constructed Using RC Corbel and Steel Billet under Progressive Collapse Scenario

Experimental Cyclic Behavior of Precast Hybrid Beam-Column Connections with Welded Components

Experimental and Numerical Study on a Proposed Moment-Resisting Connection for Precast Concrete Frames

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