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Seismic Behavior of Coupling Beams With Multi-Hook Steel Fiber Reinforced Concrete.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Seismic Behavior of Coupling Beams With Multi-Hook Steel Fiber Reinforced Concrete./
作者:	Al-Tameemi, Mohamed.
面頁冊數:	1 online resource (345 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
標題:	Environmental engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798379521127

Seismic Behavior of Coupling Beams With Multi-Hook Steel Fiber Reinforced Concrete.
Al-Tameemi, Mohamed.

Seismic Behavior of Coupling Beams With Multi-Hook Steel Fiber Reinforced Concrete. - 1 online resource (345 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2023.

Includes bibliographical references

Seismic design provisions in the ACI 318-19 Building Code for coupling beams with span-to-depth ratio ranging between 2.0 and 4.0 require to be designed either with heavily-confined diagonal reinforcement proportioned to resist the entire shear demand or as beams in Special Moment Resisting Frames. Although diagonally-reinforced coupling beams are labor-intensive and time-consuming to construct, they are the preferred reinforcement scheme selected by design engineers because of their seismic performance and higher allowable shear stress. Because of the difficulties associated with constructing diagonally-reinforced coupling beams, researchers and structural engineers paid attention to the use of steel fiber reinforcement to simplify reinforcement detailing in coupling beams. Results from research conducted in the past two decades (Setkit, 2012 and Perez-Irizarry, 2020) have indicated that it is possible to eliminate diagonal reinforcement in coupling beams with span-to-depth ratio greater than or equal to 2.0 when adding hooked steel fibers to the concrete mix. Three types of single-hook short (1.2 or 1.4 in.) steel fibers, mostly at a fiber volume content of 1.5%, were evaluated, which has imposed a significant limitation in the application of steel fiber reinforced concrete coupling beams.In this study, Twelve large-scale coupling beams were tested under displacement reversals. The coupling beams span-to-depth ratio was either 2.0, 2.25, or 3.0. Test specimens were designed to reach a peak shear stress ranging between 6 √f 'c (psi) and 10√f'c (psi). Two types of double-hook steel fibers, at fiber volume contents of 1.0% or 1.25%, were evaluated. These fibers are almost double the length and diameter of the steel fibers used in past studies. The use of larger fibers leads to a smaller number of fibers for a given fiber volume content, which facilitates concrete mixing and pouring. Further, the production cost of the double-hook steel fibers is less expensive compared to that of the short single-hook steel fibers.Test results have shown that coupling beams with aspect ratios between 2.0 and 3.0 and constructed with SFRCs featuring double-hook steel fibers and no diagonal reinforcement can achieve drifts exceeding 5.0% while subjected to a peak shear stress of at least 8 √f'c (psi). Deformation mechanisms that contributed to the coupling beam lateral displacements have been analyzed, and it showed that the behavior of the beam was dominated by flexural rotations at the beam ends. The post-peak response of the coupling beams was controlled by the sliding displacements mechanism, which ultimately led to the failure of most of the coupling beam specimens. Moreover, the energy dissipation capacity of the SFRC coupling beams from this study has been consistent with that reported in the literature and comparable to those of well-detailed diagonally-reinforced concrete coupling beams.Design recommendations for the SFRC coupling beams were proposed according to the observed behavior of the coupling beam tests. Further, recommendations for modeling the shear force versus drift hysteresis response using lumped plasticity models were proposed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379521127Subjects--Topical Terms:

557376
Environmental engineering.
Subjects--Index Terms:

Coupled wallsIndex Terms--Genre/Form:

554714
Electronic books.

Seismic Behavior of Coupling Beams With Multi-Hook Steel Fiber Reinforced Concrete.
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520 $a Seismic design provisions in the ACI 318-19 Building Code for coupling beams with span-to-depth ratio ranging between 2.0 and 4.0 require to be designed either with heavily-confined diagonal reinforcement proportioned to resist the entire shear demand or as beams in Special Moment Resisting Frames. Although diagonally-reinforced coupling beams are labor-intensive and time-consuming to construct, they are the preferred reinforcement scheme selected by design engineers because of their seismic performance and higher allowable shear stress. Because of the difficulties associated with constructing diagonally-reinforced coupling beams, researchers and structural engineers paid attention to the use of steel fiber reinforcement to simplify reinforcement detailing in coupling beams. Results from research conducted in the past two decades (Setkit, 2012 and Perez-Irizarry, 2020) have indicated that it is possible to eliminate diagonal reinforcement in coupling beams with span-to-depth ratio greater than or equal to 2.0 when adding hooked steel fibers to the concrete mix. Three types of single-hook short (1.2 or 1.4 in.) steel fibers, mostly at a fiber volume content of 1.5%, were evaluated, which has imposed a significant limitation in the application of steel fiber reinforced concrete coupling beams.In this study, Twelve large-scale coupling beams were tested under displacement reversals. The coupling beams span-to-depth ratio was either 2.0, 2.25, or 3.0. Test specimens were designed to reach a peak shear stress ranging between 6 √f 'c (psi) and 10√f'c (psi). Two types of double-hook steel fibers, at fiber volume contents of 1.0% or 1.25%, were evaluated. These fibers are almost double the length and diameter of the steel fibers used in past studies. The use of larger fibers leads to a smaller number of fibers for a given fiber volume content, which facilitates concrete mixing and pouring. Further, the production cost of the double-hook steel fibers is less expensive compared to that of the short single-hook steel fibers.Test results have shown that coupling beams with aspect ratios between 2.0 and 3.0 and constructed with SFRCs featuring double-hook steel fibers and no diagonal reinforcement can achieve drifts exceeding 5.0% while subjected to a peak shear stress of at least 8 √f'c (psi). Deformation mechanisms that contributed to the coupling beam lateral displacements have been analyzed, and it showed that the behavior of the beam was dominated by flexural rotations at the beam ends. The post-peak response of the coupling beams was controlled by the sliding displacements mechanism, which ultimately led to the failure of most of the coupling beam specimens. Moreover, the energy dissipation capacity of the SFRC coupling beams from this study has been consistent with that reported in the literature and comparable to those of well-detailed diagonally-reinforced concrete coupling beams.Design recommendations for the SFRC coupling beams were proposed according to the observed behavior of the coupling beam tests. Further, recommendations for modeling the shear force versus drift hysteresis response using lumped plasticity models were proposed.
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