Cracking Behavior of UHPC Slabs

Al-Quraishi, Hussein

doi:10.30684/etj.33.7a.8

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…The drop panels with appropriate thickness are active in decreasing the shearing stresses where the column is liable to punch through the slab, also provide an enhanced moment of resistance where the negative moments are highest and stiffen the slab and hence decrease deflection. [15]. Besides, if the drop is provided in a flat slab system, then d/2 distance is considered from face of the drop of the column, as shown in Figure 2.…”

Section: Critical Section For Punching Shear In Flat Slabs With Drop ...mentioning

confidence: 99%

The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs

Muhammed

Karim

2022

construction

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Ultra-high performance fiber reinforced concrete (UHPFRC) is a high-performance cementitious material with enhanced tension, compression, and toughness, strengths in the post crack region with high ductility, toughness, and durability. The companies prefer to use it to construct highly durable structures such as high-rise buildings, towers, and bridges. In addition, the thickness of the flat slab produced by UHPFRC might be thinner than the conventional concrete. One problem that has always been a concern in a flat slab is the punching shear failure since this failure is brittle and occurs suddenly without any previous notice. Besides, the position of the critical section for punching shear could be changed based on the thickness of the drop panel and the inclusion of fiber in the concrete. This paper highlights the effect of drop panels dimension on the punching shear resistance in UHPFRC flat slabs. The four two-way interior UHPFRC supported flat slab panels, consisting of one control flat slab without drop panels and three-flat slabs with different sizes of drop panels (10.5%,14.5%, and 19%) of the total area of slab drop panels, tested under punching load. Results indicated that the covered area of flat slabs by drop panel around 10.5% improved punching load up to %20 and 37% at the crack and ultimate loads. Furthermore, the test results show that the efficient covered area for resisting punching was 10.5% of the total area of the tested slab. Besides, the deflection values, strain in reinforcement and concrete, rotation at supports, and the inclination angles of cracks were improved due to the stiffness enhancement in the flat slabs.

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Section: Critical Section For Punching Shear In Flat Slabs With Drop ...mentioning

confidence: 99%

The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs

Muhammed

Karim

2022

construction

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“…The experimental program was made by the author [1] on G1Ufib0.5 slab (UHPC slab with 0.5% steel fiber) to study the punching shear behavior of UHPC flat slabs. This test was done in structural engineering department in Kassel University / Germany.…”

Section: Experimental Programmentioning

confidence: 99%

“…Major reasons for this are the difficulty of observing the dispersion and orientation of fibers within a concrete or mortar matrix and the current absence of technology to control their dispersion and orientation during placing. With this as a background, this study attempted to visualize fibers in concrete specimens by using John Long method to calculate the fiber dispersion and orientation on the failure plane of flat slab under punching load previously tested by the Author [1].…”

Section: Introductionmentioning

confidence: 99%

Detection of Fibers Content in UHPC Slabs

Al-Quraishi¹

2015

ETJ

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Ultra high performance concrete (UHPC) is a cementitious material with steel fiber, which is becoming more and more widely employed in building construction. The advanced mechanical behavior of the UHPC structural elements significantly depends on the steel fiber content and steel fiber orientation.In this study, the test result of UHPC slab under punching shear was previously tested by the Author is used herein to check the fiber amount and orientation at the failure plane. A method presented by John Long is presented to do this goal.It was found, that the fiber content in the failure plane is differ from the fiber volume fraction used in constructed the specimen.

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“…Based on the latest developments in concrete technology, UHPC is characterized by extraordinary mechanical properties in terms of high compressive and tensile strengths, high Young's modulus, and excellent durability and workability when compared with normal or high-strength concrete. Using steel fibers is recommended in the UHPC mix design to enhance ductility [1,2]. UHPC with high compressive strength and improved workability and durability mark a quantum leap in concrete technology.…”

Section: Introductionmentioning

confidence: 99%

Punching Capacity of UHPC Post Tensioned Flat Slabs with and Without Shear Reinforcement: An Experimental Study

et al. 2023

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Punching capacity is one of the main items in the design of both pre-stressed and non-pre-stressed flat slabs. All international design codes include provisions to prevent this type of failure. Unfortunately, there is no code provision for UHPC yet, and hence, the aim of this research is to experimentally investigate the impact of column dimensions and punching reinforcement on the punching capacity of post-tensioned slabs and compare the results with the international design codes’ provisions to evaluate its validity. The test program included five slabs with a compressive strength of 120 MPa: one as a control sample, two to study the effect of column size, and the last two to study the effect of punching reinforcement. Comparing the results with the design codes showed that ACI-318 is more accurate with an average deviation of about 5%, while EC2 is more conservative with an average deviation of about 20%. Besides that, punching reinforcement reduces the size of the punching wedge by increasing the crack angle to 28° instead of 22° for slabs without punching reinforcement. Also, the results assure that both ductility and stiffness are enhanced with the increased column dimensions and punching reinforcement ratio. Doi: 10.28991/CEJ-2023-09-03-06 Full Text: PDF

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Cracking Behavior of UHPC Slabs

Cited by 3 publications

References 4 publications

The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs

The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs

Detection of Fibers Content in UHPC Slabs

Punching Capacity of UHPC Post Tensioned Flat Slabs with and Without Shear Reinforcement: An Experimental Study

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