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140846

PERFORMANCE OF COUPLING BEAMS WITH OPENINGS EXPOSED TO CYCLIC LOADING

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Last updated: 04 Jan 2025

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Abstract

The performance of coupling beams under cyclic loadings is evaluated when they have openings with different configuration. The study is performed through experimental examination on four reduced scale coupling beams. The testing is done in the Concrete Laboratory at the Housing and Building National Research Center, Cairo, Egypt. Square openings are constructed on three specimens with different configurations whereas the fourth specimen kept without openings for the comparison matter. Two openings are fabricated at top and bottom of the diagonal bars in one beam specimen. Another specimen contains two openings at left and right of the diagonal bars. The last specimen has four square openings placed at top-bottom and left-right of the diagonal bars of the coupling beam. The yield and ultimate tensile strength of the reinforcement steel bars are 510 and 720 MPa, respectively with elastic modulus of 200 GPa. The concrete characteristic strength is 38 MPa. All specimens were tested under laterally cyclic loading to simulate the subjected loads on coupled shear walls. A special complicated setup is utilized for that issue. The results are recorded during testing and at the end of each cycle. The forcedeformation relationships are recorded and their corresponding hysteresis loops are plotted. The cracks patterns are also marked and recorded. From the obtained results, one may observe that, in case of using two openings located at right and left (near the shear walls), the stiffness of the coupling beam is slightly decreased. The coupling beams stiffness is decreased by ~8.5% for the other pattern of two openings and by ~13.5% in case of using four openings.

DOI

10.21608/erj.2020.140846

Keywords

Coupling beam, Shear behavior, openings, Cyclic loading

Authors

First Name

Abd El-Azim

Last Name

Sayed

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Affiliation

Researcher, Faculty of Engineering, Helwan University, Egypt

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First Name

Hesham

Last Name

A. Haggag

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Affiliation

Professor of Structural Engineering, Civil Engineering department, Faculty of Engineering, Helwan University,

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First Name

Wael

Last Name

M. Hassan

MiddleName

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Affiliation

Associate Professor, Structural Engineering, Housing and Building National Research Center, Egypt

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Volume

168

Article Issue

0

Related Issue

20729

Issue Date

2020-12-01

Receive Date

2021-01-18

Publish Date

2020-12-01

Page Start

191

Page End

210

Print ISSN

1110-5615

Link

https://erj.journals.ekb.eg/article_140846.html

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https://erj.journals.ekb.eg/service?article_code=140846

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4

Type

Original Article

Type Code

998

Publication Type

Journal

Publication Title

Engineering Research Journal

Publication Link

https://erj.journals.ekb.eg/

MainTitle

PERFORMANCE OF COUPLING BEAMS WITH OPENINGS EXPOSED TO CYCLIC LOADING

Details

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Article

Created At

22 Jan 2023