Design of CFST column-to-foundation/cap beam connections for moderate and high seismic regions

Stephens, Max T.; Lehman, Dawn E.; Roeder, Charles W.

doi:10.1016/j.engstruct.2016.05.023

Cited by 42 publications

(11 citation statements)

References 6 publications

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“…In this study, the PT bar had a nominal yield strength, fy_pt, of 930 MPa and was designed to behave elastically during the tests to ensure the self-centering capability of the columns. The footing and cap beam were scaled from the prototype bridge pier to have dimensions of 1.76×1.16×0.60 m and 2.20×0.74×0.50 m, respectively, and designed according to the capacity design rules to avoid any damage of these components during the experimental test [1,31]. A square hole of 0.20×0.20×0.15 m at the footing block allowed the anchorage of the PT bar at the bottom end.…”

Section: Post-tensioned Concrete-filled Steel Tube (Pcft) Column Spec...mentioning

confidence: 99%

“…According to the recommendation of Shen et al [11] and inspired by the embedded ring CFT connections developed by Stephens et al [27,31,32] and Leman et al [33], the ED bars can be substituted by steel shell extended into the footing of the connection with sufficient embedment length. This solution represents a more practical configuration for 'real-life' applications [27] and, although the rocking behavior at the base interface is precluded, the inclusion of PT bars is still beneficial for the column's self-centering capacity.…”

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confidence: 99%

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Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns

Shen

Freddi

2022

Engineering Structures

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Section: Post-tensioned Concrete-filled Steel Tube (Pcft) Column Spec...mentioning

confidence: 99%

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confidence: 99%

Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns

Shen

Freddi

2022

Engineering Structures

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“…In this Friction reduction treatment on sliding interface. The most common approach of reducing friction is to set a lowfriction sliding device between the two slipping surfaces including sliding cart or steel rollers (Cai et al, 2017;Zhang and Wang, 2000), low-friction sliding track (Stephens et al, 2016), PTFE plate (Wu et al, 2017). This method is convenient and can be easily set up in nearly all kinds of loading devices.…”

Section: Existing Treatment Methods On Lateral Friction Forcementioning

confidence: 99%

“…Many researchers have realized this problem and proposed different approaches to reduce or eliminate this influence, such as using some friction reduction treatment or new loading methods (Azizinamini et al, 1994; Fam et al, 2004; Guo and Lu, 2004; Lu and Lu, 2000; Naqvi and El-Salakawy, 2016; Saatcioglu and Ozcebe, 1989; Stephens et al, 2016; Wu et al, 2017; Yang, 2012; Zhang and Wang, 2000). All these methods and the corresponding test setup are further discussed in the following section.…”

Section: Introductionmentioning

confidence: 99%

Friction measurement and correction method in quasi-static tests of columns under combined axial and cyclic lateral loading

Wang

Feng

Shi

et al. 2019

Advances in Structural Engineering

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In quasi-static tests of large-scale structural columns and/or columns under large axial loads, the lateral friction force between the column and the loading system can become a significant problem: they may cause considerable deviation between the measured lateral force and the actual reaction force of the column, especially under large axial compression load. Many researchers have come up with different methods to reduce or eliminate the influence of such friction force. In this article, previous treatments on the lateral friction force in quasi-static tests are first discussed. A shear force measurement device, for accurate measurement of the friction force, is then presented and calibrated. Based on the friction forces measured by the device in real tests, a simple model is proposed to predict the lateral friction force in quasi-static tests. Using the model, the measured lateral force in such tests can be corrected to obtain the actual reaction force of the column when a friction measurement device is absent. The proposed model and the correction method are then validated using results from several previous tests.

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“…Various studies on connection between precast concrete elements in the bridges have been carried out ( 2 – 6 ). The Federal Highway Administration (FHWA) summarizes common connection details for prefabricated bridge elements ( 7 ).…”

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confidence: 99%

New Connection Detail to Connect Precast Column to Cap Beam using Ultra-High-Performance Concrete in Accelerated Bridge Construction Applications

Shafieifar

Farzad

Azizinamini

2018

Transportation Research Record

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Accelerated bridge construction (ABC) is a paradigm change in delivery of bridges. ABC minimizes the traffic interruption, enhances safety to public and workers by significantly reducing on-site construction activities, and results in longer-lasting bridges. The use of precast elements is gaining attention owing to inherent benefits of accelerated construction. Designing an economical connection is one of the main concerns for these structures. New improved materials such as ultra-high-performance concrete (UHPC) with superior characteristics can provide solutions for joining precast concrete elements. In this paper two types of column to cap beam connection using UHPC are proposed for seismic and non-seismic regions. Among the merits of the proposed details, large tolerances in construction and simplicity of the connection can be highlighted which facilitates and accelerates the on-site construction time. The experimental program was carried out to evaluate the performance and structural behavior of the proposed connections. Four specimens were subjected to constant axial compressive loads and cyclic lateral loading. Results of the experiment showed that the displacement ductility of the specimens, incorporating suggested details, demonstrated adequate levels of displacement ductility. More importantly, the proposed connections prevented the damage into capacity protected element—in this case the cap beam. Analytical and nonlinear finite element analysis on the specimens was carried out to better comprehend the behavior of the proposed connections.

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Design of CFST column-to-foundation/cap beam connections for moderate and high seismic regions

Cited by 42 publications

References 6 publications

Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns

Experimental and numerical investigations of the seismic behavior of socket and hybrid connections for PCFT bridge columns

Friction measurement and correction method in quasi-static tests of columns under combined axial and cyclic lateral loading

New Connection Detail to Connect Precast Column to Cap Beam using Ultra-High-Performance Concrete in Accelerated Bridge Construction Applications

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