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Strength of footing with punching shear preventers.

Lee SS, Moon J, Park KS, Bae KW - ScientificWorldJournal (2014)

Bottom Line: The validation and effectiveness of PSP were verified through a series of experimental studies.The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs.Finally, the design recommendations for the footing with PSPs were suggested.

View Article: PubMed Central - PubMed

Affiliation: Advanced Building Research Division, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang-si, Gyeonggi-do 411-712, Republic of Korea.

ABSTRACT
The punching shear failure often governs the strength of the footing-to-column connection. The punching shear failure is an undesirable failure mode, since it results in a brittle failure of the footing. In this study, a new method to increase the strength and ductility of the footing was proposed by inserting the punching shear preventers (PSPs) into the footing. The validation and effectiveness of PSP were verified through a series of experimental studies. The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs. Finally, the design recommendations for the footing with PSPs were suggested.

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Dimensions of model for parametric study.
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fig16: Dimensions of model for parametric study.

Mentions: Figure 16 shows the dimensions of the models for parametric study. The concrete footing had a square shape with side length of 2,000 mm. The depth of the footing was 400 mm. The bottom flexural reinforcing bar consisted of SD500 D29 bars spaced at 150 mm, which results in reinforcement ratio of 1%. The nominal diameter of the SD500 D29 is 28.6 mm. The yield stress of SD500 D29 was assumed to be 530 MPa. The cover depth of the concrete, c1, was 50 mm. The compressive strength of the concrete was taken as 25 MPa. The compression was applied through 300 × 300 mm square area. Four PSPs were installed into the footing, as shown in Figure 16. The yield stress of the PSP was assumed to be 400 MPa. The quarter model was used for the analysis and the four bottom edges of the footing were assumed to be simply supported.


Strength of footing with punching shear preventers.

Lee SS, Moon J, Park KS, Bae KW - ScientificWorldJournal (2014)

Dimensions of model for parametric study.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4221878&req=5

fig16: Dimensions of model for parametric study.
Mentions: Figure 16 shows the dimensions of the models for parametric study. The concrete footing had a square shape with side length of 2,000 mm. The depth of the footing was 400 mm. The bottom flexural reinforcing bar consisted of SD500 D29 bars spaced at 150 mm, which results in reinforcement ratio of 1%. The nominal diameter of the SD500 D29 is 28.6 mm. The yield stress of SD500 D29 was assumed to be 530 MPa. The cover depth of the concrete, c1, was 50 mm. The compressive strength of the concrete was taken as 25 MPa. The compression was applied through 300 × 300 mm square area. Four PSPs were installed into the footing, as shown in Figure 16. The yield stress of the PSP was assumed to be 400 MPa. The quarter model was used for the analysis and the four bottom edges of the footing were assumed to be simply supported.

Bottom Line: The validation and effectiveness of PSP were verified through a series of experimental studies.The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs.Finally, the design recommendations for the footing with PSPs were suggested.

View Article: PubMed Central - PubMed

Affiliation: Advanced Building Research Division, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang-si, Gyeonggi-do 411-712, Republic of Korea.

ABSTRACT
The punching shear failure often governs the strength of the footing-to-column connection. The punching shear failure is an undesirable failure mode, since it results in a brittle failure of the footing. In this study, a new method to increase the strength and ductility of the footing was proposed by inserting the punching shear preventers (PSPs) into the footing. The validation and effectiveness of PSP were verified through a series of experimental studies. The nonlinear finite element analysis was then performed to demonstrate the failure mechanism of the footing with PSPs in depth and to investigate the key parameters that affect the behavior of the footing with PSPs. Finally, the design recommendations for the footing with PSPs were suggested.

Show MeSH