Design considerations for one-strut failure according to TR26 – a practical approach for practising engineers

Pong, K.F.; Foo, See Liang; Chinnaswamy, C.; Ng, C.C.D.; Chow, Wang

doi:10.1080/19373260.2012.700790

Cited by 10 publications

(8 citation statements)

References 1 publication

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“…In order to obtain a reasonable simulation of OSF, Pong et al [9] proposed a simplified method using both the 2D geotechnical software PLAXIS 2D and the 3D structural software STAAD for analyses and made assumption for the OSF case using 3D structural analyses. It was found that the reduction factor of axial stiffness after removing the failed strut, instead of removing an entire strut level, was equal to 1.5 for the OSF case if 2D modeling was applied.…”

Section: Reduction Factormentioning

confidence: 99%

“…Secondly, a deep excavation, generally speaking, has multiple levels of struts and each level has more than one strut; thus, the selection of position becomes very crucial in the investigation of OSF conditions. In most cases, the lowest strut level of a deep excavation is among the most dangerous situations caused by OSF in terms of stress distribution, load transfers, and wall deflections (Whittle and Davies [1]; Goh et al [6]; Phan et al [7], Choosrithong and Schweiger [8]; Pong et al [9]). Interestingly, Liu et al [10] found that a failed strut placed at a location in the middle of a deep excavation is the most important one since its strength redundancy is the smallest compared to others.…”

Section: Introductionmentioning

confidence: 99%

“…The removal of an entire level of struts in an OSF case not only inadequately meets the demands of real-life cases but also does not fulfill the purpose of sustainable development. For this reason, Pong et al [9] proposed a method to reduce the axial stiffness of struts by a factor of 1.5 instead of removing a whole level of the horizontal temporary system as designers normally do to fulfill the requirements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Study on the Impacts of One-Strut Failure Scenarios for Deep Excavation in Loose to Medium-Dense Sand

Hsiung

Hai²,

Hsiao

2023

Sustainability

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This study aims to identify the impacts of one-strut failure (OSF) during deep excavation in loose to medium-dense sand with respect to strut loads and wall deflections. The finite element software PLAXIS was used to carry out both 2D and 3D analyses. In addition, as two-dimensional (2D) analysis is commonly applied in engineering practice due to limited budget and time, the reasonable transferring of results obtained using 3D analyses to 2D analyses for OSF influences was explored. It was found that a failed strut located at the lowest level at the center of the excavation is the most critical case since it causes the most significant impacts on strut load transferring and additional wall deflection. In order to adequately demonstrate such impacts using 2D analyses, it is suggested that a reduction factor of axial stiffness of 2.5 should be adopted instead of removing an entire level of struts, as currently being used in 2D analyses of OSF.

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Section: Reduction Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study on the Impacts of One-Strut Failure Scenarios for Deep Excavation in Loose to Medium-Dense Sand

Hsiung

Hai²,

Hsiao

2023

Sustainability

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show abstract

“…Goh and Wong [31] performed a 3D finite element analysis to study the load change in the adjacent struts when one or two struts fail and found that transfers its load to the adjacent struts, and the bending moment on the wall does not change significantly. In addition, Pong et al [32] proposed a procedure to optimize the strut forces determined by the 2D analyses according to the results of the 3D analyses in the case of failure of a single strut because the 2D analyses require more time than the 3D analyses. Some researchers study soft soils using the numerical methods and computer-based software.…”

Section: Introductionmentioning

confidence: 99%

On the Responses of Braced Diaphragm Wall Supporting Deep Excavation Subjected to Asymmetric Surcharge Loads

Akan

2023

Advances in Civil Engineering

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As cities grow, so does the need for housing and transportation infrastructure, necessitating deep excavations. Near the deep excavation, especially in the urban centers, there are existing structures whose loads are often different, resulting in asymmetric loading of the excavation system and different behavior on each side of the excavation. In this study the strut forces, lateral deformations, bending moments on each wall, as well as the settlements and heaves of the soil behind both walls in the asymmetrically loaded strut-supported excavation system are determined using the finite element method (FEM). The analyzes are performed using Plaxis 2D v20, a computer software based on the FEM. In addition, regression analyses are performed on the results, and correlations that predict the relevant results depending on the surcharge loads are presented.

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“…They must be associated even with comparing the stiffness of such a solution to the traditional construction and possible structure optimization, taking into account geometry changes that have an ambiguous impact on the structure. Thin-walled rectangular hollow section (RHS) struts have been confirmed to be vulnerable to various modes of interactions, and have shown sensitivity to different imperfections [ 10 ]. Due to their flexibility, most steel thin-walled components are designed to have an ultimate state in the elastic-plastic range [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Innovative Channel Strut Concept Manufactured by Roll-Forming

et al. 2022

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Due to the wide use of channel strut components, manufacturing is implemented in many industrial plants. Standard technology of profiles is based on welding of two parts of the profile and requires the regalvanizing of the joint zone causes. Thus, the production is challenging to automate on a single line. The main idea of the article is to present a concept of a channel strut, a cold-formed continuous metal component with an open or closed profile section. It would serve as a cantilever support instead of a standard solution. In the article, a unique lock system combination is proposed and analyzed both numerically and experimentally to provide steadiness of the strut without welding or other joining techniques. Two main lock shapes—semicircular and triangle—were proposed with some variations in the cutting plane. Analyses were carried out for three main profile cross-sections with different dimensions, based on the current industrial applications. The semicircular type of the lock was found to be the most stable, giving optimal strength to the strut under assumed loading, comparable to traditional solutions. The commercial FEM software MSC Marc was used for the numerical analysis.

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Design considerations for one-strut failure according to TR26 – a practical approach for practising engineers

Cited by 10 publications

References 1 publication

A Study on the Impacts of One-Strut Failure Scenarios for Deep Excavation in Loose to Medium-Dense Sand

A Study on the Impacts of One-Strut Failure Scenarios for Deep Excavation in Loose to Medium-Dense Sand

On the Responses of Braced Diaphragm Wall Supporting Deep Excavation Subjected to Asymmetric Surcharge Loads

Analysis of the Innovative Channel Strut Concept Manufactured by Roll-Forming

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