Behavior and Strength of Headed Stud–SFRCC Shear Connection. II: Strength Evaluation

Luo, Yunbiao; Hoki, Kazuaki; Hayashi, Kazuhiro; Nakashima, Masayoshi

doi:10.1061/(asce)st.1943-541x.0001372

Cited by 36 publications

(7 citation statements)

References 8 publications

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“…In a healthy condition, this slip should be considered minimal; however, if an extreme event occurs, ductility must be ensured by the deformation of the studs, as established in the Eurocode EN 1994EN -1 (2005. Luo et al (2015b) demonstrate that studs embedded in UHPFRC are able to provide higher ductility than when embedded in concrete. Another PI may be extracted from the strain and deflection measurements.…”

Section: Static Testmentioning

confidence: 82%

Getting More Out of Existing Structures: Steel Bridge Strengthening via UHPFRC

Martín-Sanz

Tatsis

Damjanović

et al. 2019

Front. Built Environ.

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Ultra-high-performance fiber-reinforced cement-based composite (UHPFRC) has been increasingly adopted for rehabilitation projects over the past two decades, proving itself as a reliable, cost-efficient and sustainable alternative against conventional methods. High compressive strength, low permeability and high ductility are some of the characteristics that render UHPFRC an excellent material for repairing existing aged infrastructure. UHPFRC is most commonly applied as a surface layer for strengthening and rehabilitating concrete structures such as bridge decks or building slabs. However, its implementation with steel structures has so far been limited. In this work, the UHPFRC strengthening of a steel bridge is investigated both in simulation as well as in the laboratory, by exploiting a real-world case study: the Buna Bridge. This Croatian riveted steel bridge, constructed in 1893, repaired in 1953, and decommissioned since 2010, was removed from its original location and transported to laboratory facilities for testing prior to and after rehabilitation via addition of UHPFRC slab. The testing campaign includes static and dynamic experiments featuring state-of-the-art monitoring systems such as embedded fiber optics, acoustic emission sensors and digital image correlation. The information obtained prior to rehabilitation serves for characterization of the actual condition of the structure and allows the design of the rehabilitation solution. The UHPFRC slab thickness was optimized to deliver optimal fatigue and ultimate capacity improvement at reasonable cost. Once the design was implemented, a second round of experiments was conducted in order to confirm the validity of the solution, with particular attention allocated to the interface between the steel substrate and the UHPFRC overlay, as the connection between both materials may result in a weak contact point. A detailed fatigue analysis, based on updated FEM models prior to and after strengthening, combined with the results of a reliability analysis prove the benefits of adoption of such a solution via the significant extension of the structural lifespan.

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Section: Static Testmentioning

confidence: 82%

Getting More Out of Existing Structures: Steel Bridge Strengthening via UHPFRC

Martín-Sanz

Tatsis

Damjanović

et al. 2019

Front. Built Environ.

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“…Figure 16 shows the damage of the thin UHPC layer, short stud connectors, and PE interface in various steel-UHPC composite decks. In Figure 16, the stud's equivalent plastic strain (PEEQ) is greater than 0.2, indicating that the stud fracture (Luo et al, 2016). The equivalent plastic strain (PEEQ) of UHPC is greater than 0.03, indicating the failure of UHPC (Luo et al, 2016).…”

Section: Discussionmentioning

confidence: 98%

“…In Figure 16, the stud's equivalent plastic strain (PEEQ) is greater than 0.2, indicating that the stud fracture (Luo et al, 2016). The equivalent plastic strain (PEEQ) of UHPC is greater than 0.03, indicating the failure of UHPC (Luo et al, 2016). In addition, when the interface element's stiffness degradation (SDEG) reaches 1, the PE interface fails.…”

Section: Discussionmentioning

confidence: 99%

Bending behavior of steel-UHPC composite bridge deck based on epoxy adhesive

Jiang

Deng

et al. 2022

Front. Mater.

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Using ultra-high performance concrete (UHPC) as the pavement layer on the orthotropic steel deck (OSD) can greatly enhance the rigidity to solve the fatigue cracking of the steel deck and the resulting damage to the pavement layer. However, the thin UHPC layer limits the extensive use of the short stud connector. In this study, three types of interfaces were designed by introducing different additives into the epoxy matrix, and the shear properties of each interface and short stud connector were compared. Then, the influence of short stud connectors and optimized interface on the composite bridge deck’s bending property was analyzed through the composite bridge deck’s bending test. Moreover, the mechanical behavior of the interface in the composite bridge deck is discussed based on the finite element model. The results show that the ultimate load of the composite bridge deck with the optimized interface is reduced by 21.5% compared with that of the composite bridge deck with the short stud connector. However, the composite bridge deck with the optimized interface has higher bending stiffness before failure and is less affected by cyclic loading. Moreover, the composite bridge deck with the optimized interface is unsuitable for cyclic loading conditions when the defect area reaches 30%. Finally, the numerical simulation of the composite bridge deck with the optimized interface is successfully realized based on the cohesive zone model, and the applicability of the interface in the composite bridge deck is verified.

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“…Luo et al [23] proposed an empirical equation to evaluate the shear resistance of welded headed stud embedded in ultra-high performance concrete (UHPC) by considering the contribution of welded collar portion at the root of the headed stud. The ultimate shear capacity is given as:…”

Section: Shear Resistancementioning

confidence: 99%

Shear Behavior of Novel Demountable Bolted Shear Connector for Prefabricated Composite Beam

2022

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Bolted shear connectors offer alternatives to achieve steel-concrete composite action instead of conventional welded headed studs especially for prefabricated constructions and demountable composite structures. This paper firstly proposed a new type of demountable steel-concrete bolted shear connectors based on the double-nut friction-grip high strength bolted connector, which modify the upper nut into conical locking nut. This paper performed ten full scale push-out tests to study shear behaviors of the developed new type of connectors. Testing parameters included bolt configuration, strength, diameter of bolts and strength of infilled grout. Test results indicate that shear behaviors and slip capacity of the conventional bolted connectors are significantly improved when the bolted connector incorporating with conical locking nut. The influences of these studied parameters on shear behaviour of novel bolted shear connectors are revealed and discussed. The developed novel demountable connector exhibits an average 25% improvement in ultimate shear resistance over conventional bolted connectors. Moreover, the shear stiffness of the developed bolted connectors is about six times of the conventional bolted connector through eliminating the clearance between steel flange hole and bolt shank.

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Behavior and Strength of Headed Stud–SFRCC Shear Connection. II: Strength Evaluation

Cited by 36 publications

References 8 publications

Getting More Out of Existing Structures: Steel Bridge Strengthening via UHPFRC

Getting More Out of Existing Structures: Steel Bridge Strengthening via UHPFRC

Bending behavior of steel-UHPC composite bridge deck based on epoxy adhesive

Shear Behavior of Novel Demountable Bolted Shear Connector for Prefabricated Composite Beam

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