Reinforcing the octagonal web openings of castellated beam by steel rings

Joint Authors

al-Dhabhawi, Haydar Wafi Ali
Muhammad, Abbas A.

Source

al-Qadisiyah Journal for Engineering Sciences

Issue

Vol. 12, Issue 1 (31 Mar. 2019), pp.7-16, 10 p.

Publisher

al-Qadisiyah University College of Engineering

Publication Date

2019-03-31

Country of Publication

Iraq

No. of Pages

10

Main Subjects

Mechanical Engineering

Topics

Abstract EN

Castellated steel beams are section steel members with hexagonal or octagonal web openings which they are made from standard hot rolled steel section I or H.

The main advantage of these members is their economic material.

An additional important advantage is a possibility to guide service ducts through the openings.

The presence of the web openings influences the members' failure behavior around the openings, new local failure modes will come into existence, such as the buckling of the web post between the openings, or yielding around the openings.

Castellated beams with octagonal openings usually fail due to web post-buckling because of the increase in depth.

The current study focused on improving the behavior of the castellated beam with octagonal openings using steel ring stiffener and adjusting the best dimension and distribution for the stiffeners.

All the models of specimens have been fabricated from a parent I section (IPE 140).

The models have been modeled and analyzed using finite element software ANSYS (version 15).

The analysis results showed that reinforcing octagonal castellated beams by adding steel ring stiffeners around octagonal web opening was very active way to increase the ultimate load for long span, where the ultimate load of reinforced octagonal castellated beam increased up to (286% ) compared with parent I-section beam.

Economically, the percentage of additional steel material which used to expansion and reinforce the castellated beams (spacer plate and steel ring stiffeners) was (36% ) when compared with the weight of parent I-section beam.

While the allowable load at deflection (L/180) was (260 % ) compared to the allowable load of parent section at the same deflection.

The gained benefit was increasing the ultimate and allowable load of reinforced octagonal castellated beams by (186% ) and (160% ) respectively by using additional steel material only (36% ) from the weight of parent I- section, which the additional steel material consisted from the spacer plates and steel rings.

Also, the results indicate that the best dimensions for the ring were when thickness equal to the web thickness of the parent section and the width equal to the half of the parent section flange Castellated steel beams are section steel members with hexagonal or octagonal web openings which they are made from standard hot rolled steel section I or H.

The main advantage of these members is their economic material.

An additional important advantage is a possibility to guide service ducts through the openings.

The presence of the web openings influences the members' failure behavior around the openings, new local failure modes will come into existence, such as the buckling of the web post between the openings, or yielding around the openings.

Castellated beams with octagonal openings usually fail due to web post-buckling because of the increase in depth.

The current study focused on improving the behavior of the castellated beam with octagonal openings using steel ring stiffener and adjusting the best dimension and distribution for the stiffeners.

All the models of specimens have been fabricated from a parent I section (IPE 140).

The models have been modeled and analyzed using finite element software ANSYS (version 15).

The analysis results showed that reinforcing octagonal castellated beams by adding steel ring stiffeners around octagonal web opening was very active way to increase the ultimate load for long span, where the ultimate load of reinforced octagonal castellated beam increased up to (286% ) compared with parent I-section beam.

Economically, the percentage of additional steel material which used to expansion and reinforce the castellated beams (spacer plate and steel ring stiffeners) was (36% ) when compared with the weight of parent I-section beam.

While the allowable load at deflection (L/180) was (260 % ) compared to the allowable load of parent section at the same deflection.

The gained benefit was increasing the ultimate and allowable load of reinforced octagonal castellated beams by (186% ) and (160% ) respectively by using additional steel material only (36% ) from the weight of parent I- section, which the additional steel material consisted from the spacer plates and steel rings.

Also, the results indicate that the best dimensions for the ring were when thickness equal to the web thickness of the parent section and the width equal to the half of the parent section flange width.

American Psychological Association (APA)

al-Dhabhawi, Haydar Wafi Ali& Muhammad, Abbas A.. 2019. Reinforcing the octagonal web openings of castellated beam by steel rings. al-Qadisiyah Journal for Engineering Sciences،Vol. 12, no. 1, pp.7-16.
https://search.emarefa.net/detail/BIM-1039312

Modern Language Association (MLA)

al-Dhabhawi, Haydar Wafi Ali& Muhammad, Abbas A.. Reinforcing the octagonal web openings of castellated beam by steel rings. al-Qadisiyah Journal for Engineering Sciences Vol. 12, no. 1 (2019), pp.7-16.
https://search.emarefa.net/detail/BIM-1039312

American Medical Association (AMA)

al-Dhabhawi, Haydar Wafi Ali& Muhammad, Abbas A.. Reinforcing the octagonal web openings of castellated beam by steel rings. al-Qadisiyah Journal for Engineering Sciences. 2019. Vol. 12, no. 1, pp.7-16.
https://search.emarefa.net/detail/BIM-1039312

Data Type

Journal Articles

Language

English

Notes

-

Record ID

BIM-1039312