Mechanical model for punching shear capacity of rectangular slab‐column connections

Farzam, Masood; Sadaghian, Hamed

doi:10.1002/suco.201700213

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…The simulation of fiber-reinforced concrete (FRC) beam behavior was carried out us ing ATENA [39] in conjunction with the GID [40] pre-processor software. This softwar has been previously used in numerous research to simulate the behavior of normal con crete [41][42][43][44][45] and FRCs [7][8][9][10]. As there is currently no standardized method for modeling FRC, an inverse analysis based on the software developers' guidelines [39] was employed to derive the post-cracking tensile stress versus fracture strain relationship for FRCs.…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

Experimental Investigation of Shear Behavior in High-Strength Concrete Beams Reinforced with Hooked-End Steel Fibers and High-Strength Steel Rebars

Alizadeh,

Moradi Shaghaghi,

Pourbaba

et al. 2023

Buildings

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Shear failure is an unfavorable phenomenon as it is a brittle type of failure; however, adding rebars and fibers to a concrete beam can minimize its detrimental effects. The objective of this study was to experimentally investigate the shear behavior of high-strength concrete (HC) beams reinforced with hooked-end (H) steel fibers and high-strength steel (HS) rebars under three-point bending tests. For this purpose, nine HC beams (300 × 250 × 1150 mm in dimension) were cast with 0%, 1%, and 2% H fibers by volume in three longitudinal rebar ratios (i.e., 1.5%, 2.0%, and 3.1%) and compared with beams without fibers. Furthermore, numerical analyses were performed to validate the experimental results and compare them with design codes. The results showed that, irrespective of the fiber content or longitudinal rebar ratio, the beams failed in shear. Increasing the rebar ratio and fiber content increased the shear capacity to as high as 100% (for the specimen with 3% rebar and 2% fiber compared to its counterpart with 1% rebar and 2% fiber). In addition, the research-based equations proposed in the literature either overestimated or underestimated the shear capacity of fibrous HC beams significantly. The level of overestimation or underestimation was closely related to the sensitivity of the proposed model to the shear span ratio and the fiber content. Rebars proved to be more beneficial in contributing to the shear capacity, but the rate of this positive contribution decreased as the fiber ratio increased. Finally, the inverse analysis approach adopted herein proved to be an efficient tool in estimating the shear response of fiber-reinforced beams failing in shear (margin of error: less than 10%).

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Section: Numerical Simulation and Resultsmentioning

confidence: 99%

Experimental Investigation of Shear Behavior in High-Strength Concrete Beams Reinforced with Hooked-End Steel Fibers and High-Strength Steel Rebars

Alizadeh,

Moradi Shaghaghi,

Pourbaba

et al. 2023

Buildings

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“…Usually, the production of UHPC needs a relatively high quantity of cement, and often, the required amount is not evaluated or optimized. Thus, the economic cost and environmental issues present the main challenges in the production process of UHPC [28][29][30][31][32][33]. Moreover, the use of UHPC in construction is limited due to its high cost of production.…”

Section: Introductionmentioning

confidence: 99%

Development and Performance Evaluation of UHPC and HPC Using Eco-Friendly Additions as Substitute Cementitious Materials with Low Cost

2023

Self Cite

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Ultra-high-performance concrete (UHPC) and high-performance concrete (HPC) are widely used in construction engineering applications. The quality and economy of this type of concrete are the main challenges in real construction systems due to their expensive cost. In the present investigation, the performances of UHPC and HPC were improved using eco-friendly additives from natural sources or industrial wastes. Accordingly, different kinds of concrete mixtures were prepared with the addition of various eco-friendly materials, such as metakaolin (10, 15, and 20%), silica fume (2.5, 5, 10, and 15%), cement kiln dust (CKD) (0, 5, and 10%), and 1 vol.% of steel and polypropylene fibers. All of these materials were subjected to efficient treatment and purification processes. The results indicated that the prepared UHPC was characterized by high compression and flexural strengths. The prepared UHPC (sample CR-2) with metakaolin (10%), CKD (10%), and 1 vol.% of steel fibers provided the highest compressive strength of 135 MPa at 28 days. Moreover, the results showed that reducing the cement amounts to 750, 500, and 250 kg/m3 provided concrete with efficient structural requirements and specifications and can be characterized as UHPC and HPC. Also, the mixture (sample CM15) with a metakaolin addition of 15%, CKD of 100 kg/m3, and 1 vol.% of steel fibers showed the highest flexural strength of 19.14 MPa at 28 d. Moreover, the highest splitting tensile strength of the prepared UHPC cylinders was 9.6 MPa at 28 d for the MSS1000 sample, which consisted of 15% metakaolin, a cement content of 1000 kg/m3, silica fume of 10%, and steel fibers of 1% vol. The prepared UHPC mixtures will reduce the amount of consumed cement and the production cost, with a high performance in comparison to classical concrete. Finally, it was clear that the prepared UHPC and HPC concrete with green additions can serve efficiently in specific construction applications, with high performance, economic feasibility, and safe environmental impacts.

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Uncertainty of concrete strength in shear and flexural behavior of beams using lattice modeling

Khalilzadehtabrizi

Sadaghian

Farzam

2023

Front. Struct. Civ. Eng.

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Mechanical model for punching shear capacity of rectangular slab‐column connections

Cited by 8 publications

References 14 publications

Experimental Investigation of Shear Behavior in High-Strength Concrete Beams Reinforced with Hooked-End Steel Fibers and High-Strength Steel Rebars

Experimental Investigation of Shear Behavior in High-Strength Concrete Beams Reinforced with Hooked-End Steel Fibers and High-Strength Steel Rebars

Development and Performance Evaluation of UHPC and HPC Using Eco-Friendly Additions as Substitute Cementitious Materials with Low Cost

Uncertainty of concrete strength in shear and flexural behavior of beams using lattice modeling

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