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18923

EFFECT OF WALL ASPECT RATIO ON SEISMIC RESPONSE OF NARROW MECHANICALLY STABILIZED EARTH WALLS

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Last updated: 22 Jan 2023

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Abstract

Increasing population and expanding urban development in limited spaces involves construction of Narrow Mechanically Stabilized Earth (NMSE) walls having an aspect ratio (ratio of reinforcement length, L, to wall height, H) below 0.70. When constructed in seismically active zones, these walls are subject to seismic ground motions. The purpose of this paper is to present the results of small scale shaking table tests on NMSE walls with rigid facing. A series of reduced scale (1/8 of the prototype model) shaking table tests are performed on a 1-dimensional shaking table. The modeled walls have aspect ratio (L/H) of 0.20, 0.30 and 0.40. The model is shacked using ramped sinusoidal base accelerations with incrementally increasing displacement amplitude (i.e. actuator stroke) and constant frequencies to generate an equivalent base acceleration ranging from 0.05 g to 0.70 g or until failure occurs. Ground motion frequency of 2.5 Hz is used. The results show that at input accelerations ranging from 0.25g to 0.45g yielding occurs and the NMSE walls behaves as a rigid body. Subsequently, excessive deformations occur due to the pull out of the top reinforcement layers. An amplification factor of 2.50 times the input ground motion is measured at the surface of the NMSE models. Furthermore, the average design acceleration for the model walls ranges from 1.02 to 1.35 of the input base acceleration.

DOI

10.21608/auej.2018.18923

Keywords

Shaking Table, NMSE Walls, Rigid Face, reinforcement, aspect ratio, Amplification Factor)

Authors

First Name

Ahmed

Last Name

Rabei

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Affiliation

Cairo University and Teaching Assistant, Scientific Research Developing Unit, Beni Suef University, Egypt

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Orcid

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First Name

Rami

Last Name

El-Sherbiny

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Affiliation

Public Works Department, Cairo University, Egypt

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First Name

Omar

Last Name

Ezzeldine

MiddleName

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Affiliation

Public Works Department, Cairo University, Egypt

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City

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Orcid

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First Name

Mohamed

Last Name

Amer

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Affiliation

Public Works Department, Cairo University, Egypt

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Volume

13

Article Issue

49

Related Issue

3835

Issue Date

2018-10-01

Receive Date

2018-11-13

Publish Date

2018-10-01

Page Start

1,220

Page End

1,228

Print ISSN

1687-8418

Link

https://jaes.journals.ekb.eg/article_18923.html

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https://jaes.journals.ekb.eg/service?article_code=18923

Order

17

Type

Original Article

Type Code

706

Publication Type

Journal

Publication Title

Journal of Al-Azhar University Engineering Sector

Publication Link

https://jaes.journals.ekb.eg/

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Article

Created At

22 Jan 2023