Loadbearing capacity and deformability of vertical joints in structural walls of large panel buildings

Cholewicki, A.

doi:10.1016/0007-3628(71)90009-0

Cited by 30 publications

(22 citation statements)

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“…For a plane joint specimen, two stages of joint behavior were revealed, precracking and postcracking. Parameters such as, amount and spacing of transverse joint reinforcement, strength of joint concrete, and width of joint affect the shear strength of a joint . For a joint with castellation, the number and geometry of the shear keys affect the shear strength .…”

Section: Literature Reviewmentioning

confidence: 99%

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Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading

Biswal

Prasad

Sengupta

2018

Structural Concrete

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A precast wall‐type building is constructed by stacking wall panels and slabs. This paper presents a study of the in‐plane shear behavior of vertical grouted joints between precast panels. Thirteen jointed wall panel specimens were tested under direct shear. Based on the results, analytical expressions were developed to predict the shear load versus slip behavior. These can be used in computational models of precast wall type buildings, through modeling of shear springs between the panels. To demonstrate the application, a numerical analysis of an isolated jointed shear wall was performed. The wall was modeled for three cases, (a) monolithic wall, (b) two walls with a gap and (c) two walls with shear links. Based on non‐linear pushover analysis, it was demonstrated that the modeling of jointed walls using shear links reduces the conservatism inherent in a model neglecting the shear transfer across the joint.

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Section: Literature Reviewmentioning

confidence: 99%

“…The expressions proposed by Cholewicki, Chakrabarti et al, Abdul‐Wahab and Sarsam, and Chatveera and Nimityongskul were considered to compare the values of ultimate capacity. The residual strength was compared with ACI‐318 and BS8110.…”

Section: Comparison With Existing Modelsmentioning

confidence: 99%

Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading

Biswal

Prasad

Sengupta

2018

Structural Concrete

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“…Hansen et al summarized the early work on this topic in a report, which constitutes the work of the CIB commission W23A. The experimental programs that served as basis for the commission's report include the work of Halasz and Tantow, Cholewicki, Pommeret, and Fauchart and Cortini, who used similar test setups as the one used in the present study. Shear tests with other test setups to investigate factors that influence the load‐carrying capacity have also been published .…”

Section: Previous Investigations On Shear Connectionsmentioning

confidence: 99%

Test and analysis of a new ductile shear connection design for RC shear walls

Sørensen

Hoang

Olesen

et al. 2017

Structural Concrete

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Funding informationDanish Association for Precast Concrete Elements; COWI Foundation. This paper presents a new and construction-friendly shear connection for the assembly of precast reinforced concrete shear wall elements. In the proposed design, the precast elements have indented interfaces and are connected by a narrow zone grouted with mortar and reinforced with overlapping U-bar loops. Contrary to conventional shear connections, the planes of the U-bar loops are here parallel to the plane of the wall elements. This feature enables a constructionfriendly installation of the elements without the risk of rebars clashing. The core of mortar inside each U-bar loop is reinforced with a transverse double T-headed bar to ensure transfer of tension between the overlapping U-bars. Push-off tests show that a significantly ductile load-displacement response can be obtained by the new solution as compared to the performance of the conventional keyed shear connection design. The influence of the interface indentation geometry was investigated experimentally and the failure modes in the push-off tests were identified by use of digital image correlation (DIC). For strength prediction, rigid plastic upper-bound models have been developed with inspiration from the observed failure mechanisms. Satisfactory agreement between tests and calculations has been obtained. K E Y W O R D Sconcrete plasticity, digital image correlation, ductility, keyed shear connections, robustness | INTRODUCTIONStructural solutions based on precast concrete elements are often more economically feasible than in situ cast solutions, because precast technology enables a reduction of construction time as well as labor cost. When using precast solutions, the on-site work mostly consists of assembling and connecting the precast elements into an integrated structural system. Hence, connection designs that are constructionfriendly play an important role for the overall cost reduction. It is, however, a challenge to design connections that are easy to construct and at the same time have structural performance (in terms of strength and ductility) which can be compared with that of in situ cast solutions. In cases with unusual structural geometry, it may be necessary to supplement the advantages of precast construction with in situ cast solutions in selected zones. An example of how current precast solutions have been pushed to the limit can be studied in References 1 and 2 that report on the design and construction of a landmark building in Copenhagen, Denmark. The leaning characteristic of the building imposed serious challenges to the design of the shear connections between the precast panels for insurance of overall structural stability.Currently, structural continuity between precast shear panels is established by use of narrow keyed connections containing overlapping U-bars and grouted with mortar (see Figure 1). However, with this conventional solution, which has been used since the 1960s, it is difficult to obtain full structural continuity because the ...

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“…The focus has mainly been on the load carrying capacity and the design aspects of the joint configuration. The report by Hansen et al (1976) summarizes the work of the CIB commission W23A and the experimental programs that served as basis for the commissions work, including the work of Cholewicki (1971), Pommeret (1972), and Fauchart and Cortini (1972) who used similar test setups as presented in this work. Later on Nimityongskul and Liu (1980), Chakrabarti et al (1981), Abdul-Wahab (1986), and Serrette et al (1989) performed tests with different test setups also investigating factors influencing the load carrying capacity.…”

Section: Previous Investigationsmentioning

confidence: 99%

Construction-friendly ductile shear joints for precast concrete panels

Sørensen¹,

Hoang²,

Fischer³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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The scope of this paper is the shear capacity of in-situ cast joints between precast concrete panels. Current practice with vertical lowering of the wall panels experiences difficulties in the assembly phase, since the traditional U-bar connection requires an overlap in a horizontal plane to allow for the mounting of a vertical locking bar. Where limited space is available bending and subsequent straightening of the U-bars are required to assemble the adjacent panels, a procedure which imposes substantial ductility requirements on the reinforcement as well as some manual workload. This paper introduces a construction-friendly design with U-bars overlapping in the same plane as the panel itself. The design allows for a trouble-free vertical lowering of the panels without pre or post processing of the preinstalled reinforcement loops. Furthermore, an overall more ductile behavior of the joint is obtained. The solution is tested in a push-off experimental setup and the influence of important geometric parameters of the keyed shear joint is investigated. The first peak load carrying capacity is assessed using plasticity models, and the failure modes are identified by the use of digital image correlation. The upper bound models produce satisfactory results capturing the experimental tendencies and predicting the mode of shear failure in the shear keys.

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Loadbearing capacity and deformability of vertical joints in structural walls of large panel buildings

Cited by 30 publications

References 0 publications

Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading

Study of shear behavior of grouted vertical joints between precast concrete wall panels under direct shear loading

Test and analysis of a new ductile shear connection design for RC shear walls

Construction-friendly ductile shear joints for precast concrete panels

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