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Article
Publication date: 1 April 1994

J. Noorzaei, M.N. Viladkar and P.N. Godbole

Study of soil‐structure interaction effect in framed structuresnecessitates proper physical modelling of the structure, foundation and thesoil mass. At the same time, the…

136

Abstract

Study of soil‐structure interaction effect in framed structures necessitates proper physical modelling of the structure, foundation and the soil mass. At the same time, the stress—strain model used for the constitutive relationship of the soil mass must also be realistic. In the present study, a hyperbolic stress—strain model has been used to consider the soil non‐linearity. The interactive behaviour of a five storey, two bay plane frame has been studied in detail and the results are compared with those obtained from a conventional and a linear interactive analysis.

Details

Engineering Computations, vol. 11 no. 4
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 10 April 2007

Shibli R.M. Khan, J. Noorzaei, M.R.A. Kadir, A.M.T. Waleed and M.S. Jaafar

This paper aims to present a research finding that establishes a regression model between ultrasonic pulse velocity (UPV) tests and actual strength of high performance concrete…

1713

Abstract

Purpose

This paper aims to present a research finding that establishes a regression model between ultrasonic pulse velocity (UPV) tests and actual strength of high performance concrete (HPC).

Design/methodology/approach

In this study, a total of 270 cube samples were made from six different mix proportions. The mixes were grouped in two series that consist of nominal maximum aggregate sizes of 10 mm (A10) and 19 mm (A19). Silica fume were used as mineral admixtures at 5 percent, 10 percent and 15 percent of cement in both series. UPV tests were conducted for each of the specimens, followed by destructive strength tests. The tests were carried out for concrete at different ages of between three to 56 days. The destructive test results were used as the true strength of the mixes and the UPV test results were used as strength estimation.

Findings

Concrete strength correlations between UPV and destructive tests were analysed for each mix proportions and in each series. These correlations are presented in the form of regression equations that displays standard error of between ±2.4 to ±5.7 MPa regardless of mix for the concrete in series A10. Similarly, in series A19 concrete, standard errors of between ±3.2 to ±6.7 MPa were found. Strength prediction models using UPV for high performance concrete are proposed. The models have overall correlation coefficients above 0.80 for all the mixes.

Originality/value

There are no standard relationships that had been established for high performance concrete strength with UPV test methods. The proposed relationship can be used for concrete strength estimation that is normally required in building or structural assessment, especially with the present trend of constructing modern structures using high performance concrete.

Details

Structural Survey, vol. 25 no. 1
Type: Research Article
ISSN: 0263-080X

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Article
Publication date: 21 January 2022

Mustafa S. Al-Khazraji, M. J. Jweeg and S. H. Bakhy

The purpose of this paper is to investigate the free vibration response of a laminated honeycomb sandwich panels (LHSP) for aerospace applications. Higher order shear deformation…

210

Abstract

Purpose

The purpose of this paper is to investigate the free vibration response of a laminated honeycomb sandwich panels (LHSP) for aerospace applications. Higher order shear deformation theory (HSDT) was simplified for the dynamic analysis of LHSP. Furthermore, the effects of honeycomb parameters on the value of natural frequency (NF) of vibration were explored.

Design/methodology/approach

This paper applies HSDT to the analysis of composite LHSP to derive four vibration differential equations of motion and solve it to find the NF of vibration. Two analytical models (Nayak and Meunier models) were selected from literature for comparison of the NF of vibration. In addition, a numerical model was built by using ABAQUS and the results were compared. Furthermore, parametric studies were conducted to explore the effect of honeycomb parameters on the value of the NF of vibration.

Findings

The present model is successful in simplifying HSDT for the analysis of LHSP. The first five natural frequencies of vibration were calculated analytically and numerically. In the parametric study, increasing core height or young’s modulus or changing laminate layup will increase the value of NF of vibration. Furthermore, increasing plate constraint (using clamped edge boundary condition) will increase the value of NF of vibrations.

Research limitations/implications

The current analysis is suitable for all-composite symmetric LHSP. However, for isotropic or non-symmetric materials, minor modifications might be adopted.

Originality/value

The application of simplified HSDT to the analysis of LHSP is one of the important values of this research. The other is the successful and complete dynamic analysis of all-composite LHSP.

Details

Journal of Engineering, Design and Technology , vol. 22 no. 2
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 17 February 2022

Md. Habibur Rahman Sobuz, Md. Montaseer Meraz, Ayan Saha, Abu Sayed Mohammad Akid, Noor Md. Sadiqul Hasan, Mizanoor Rahman and Md. Abu Safayet

This study aims to present the variations of optimal seismic control of reinforced cement concrete (RCC) structure using different structural systems. Different third-dimensional…

296

Abstract

Purpose

This study aims to present the variations of optimal seismic control of reinforced cement concrete (RCC) structure using different structural systems. Different third-dimensional mathematical models are used to examine the responses of multistory flexibly connected frames subjected to earthquake excitations.

Design/methodology/approach

This paper examined a G + 50 multi-storied high-rise structure, which is analyzed using different combinations of moment resistant frames, shear walls, seismic outrigger systems and seismic dampers to observe the effectiveness during ground motion against soft soil conditions. The damping coefficients of added dampers, providing both upper and lower levels are taken into consideration. A finite element modeling and analysis is generated. Then the nature of the structure exposed to ground motion is captured with response spectrum analysis, using BNBC-2020 for four different seismic zones in Bangladesh.

Findings

The response of the structure is investigated according to the amplitude of the displacements, drifts, base shear, stiffness and torsion. The numerical results indicate that adding dampers at the base level can be the most effective against seismic control. However, placing an outrigger bracing system at the middle and top end with shear wall can be the most effective for controlling displacements and drifts.

Originality/value

The response of high-rise structures to seismic forces in Bangladesh’s soft soil conditions is examined at various levels in this study. This study is an original research which contributes to the knowledge to build earthquake resisting high-rises in Bangladesh.

Details

Journal of Engineering, Design and Technology , vol. 22 no. 3
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 13 January 2021

Ahmed Attia, Salim Guettala and Rebih Zaitri

The purpose of this paper is to implement the mathematical models to predict concretes physico-mechanical characteristics made with binary and ternary sands using a mixture design…

104

Abstract

Purpose

The purpose of this paper is to implement the mathematical models to predict concretes physico-mechanical characteristics made with binary and ternary sands using a mixture design method. It is a new technique that optimizes mixtures without being obliged to do a lot of experiments. The goal is to find the law governing the responses depending on mixture composition and capable of taking into account the effect of each parameter separately and in interaction between several parameters on the characteristics studied.

Design/methodology/approach

Mixture design method was used for optimizing concretes characteristics and studying the effects of river sand (RS), dune sand (DS) and crushed sand (CS) in combinations of binary system and ternary on workability, the compressive and flexural strengths of concretes at 7 and 28 days. A total of 21 mixtures of concrete were prepared for this investigation. The modeling was carried out by using JMP7 statistical software.

Findings

Mixture design method made it possible to obtain, with good precision, the statistical models and the prediction curves of studied responses. The models have relatively good correlation coefficients (R2 = 0.70) for all studied responses. The use of binary and ternary mixtures sands improves the workability and their mechanical strengths. The obtained results proved that concrete, based on binary mixture C15, presents the maximum compressive strength (MCS) on 28 day with an improvement of around 20%, compared to reference concrete (C21). For ternary mixtures, MCS on 28 day was obtained for the mixture C10 with an improvement of around 15% compared to C21. Increase in compressive strength during the progress of hydration reactions was accompanied by an increase in the flexural strength, but in different proportions.

Originality/value

The partial incorporation of DS (= 40%) in the concrete formulation can provide a solution for some work in the southern regions of country. In addition, the CS is an interesting alternative source for replacing 60% of RS. The concrete formulation based on local materials is really capable of solving the economic and technical problems encountered in the building field, as well as environmental problems. Local resources therefore constitute an economic, technological and environmental alternative.

Details

World Journal of Engineering, vol. 18 no. 2
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 11 April 2020

Mohammad Rezaiee-Pajand, Nima Gharaei-Moghaddam and Mohammadreza Ramezani

This paper aims to propose a new robust membrane finite element for the analysis of plane problems. The suggested element has triangular geometry. Four nodes and 11 degrees of…

171

Abstract

Purpose

This paper aims to propose a new robust membrane finite element for the analysis of plane problems. The suggested element has triangular geometry. Four nodes and 11 degrees of freedom (DOF) are considered for the element. Each of the three vertex nodes has three DOF, two displacements and one drilling. The fourth node that is located inside the element has only two translational DOF.

Design/methodology/approach

The suggested formulation is based on the assumed strain method and satisfies both compatibility and equilibrium conditions within each element. This establishment results in higher insensitivity to the mesh distortion. Enforcement of the equilibrium condition to the assumed strain field leads to considerably high accuracy of the developed formulation.

Findings

To show the merits of the suggested plane element, its different properties, including insensitivity to mesh distortion, particularly under transverse shear forces, immunities to the various locking phenomena and convergence of the element are studied. The obtained results demonstrate the superiority of the suggested element compared with many of the available robust membrane elements.

Originality/value

According to the attained results, the proposed element performs better than the well-known displacement-based elements such as linear strain triangular element, Q4 and Q8 and even is comparable with robust modified membrane elements.

Details

Engineering Computations, vol. 37 no. 9
Type: Research Article
ISSN: 0264-4401

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Article
Publication date: 19 February 2020

Alrence Santiago Halibas, Shameena Mehtab, Alaa Al-Attili, Benjamin Alo, Ronald Cordova and Maria Elisa Linda Taeza Cruz

Graduates are expected to possess the knowledge and right skillset, commonly known as graduate attributes, which they need to become employable and work-ready. This study…

671

Abstract

Purpose

Graduates are expected to possess the knowledge and right skillset, commonly known as graduate attributes, which they need to become employable and work-ready. This study describes the approaches that were employed by an academic institution in developing an assessment framework for measuring the student achievement of the graduate attributes and learning outcomes.

Design/methodology/approach

It used thematic analysis in analyzing the 43 audit reports of higher educational institutions (HEIs) in Oman which have undergone the regional quality audit as well as the outcomes of the institutional standards assessment.

Findings

The analysis exposed the critical issues necessary for embedding graduate attributes and learning outcomes in higher education. Likewise, the study revealed that the assessment of the graduate attributes (GAs) and learning outcomes (LOs) is the area that garnered the most number of comments from the audit panel, and 69 per cent of the HEIs are still problematic in this area. Moreover, most of the HEIs in Oman lack the mechanisms to assess student learning as evidenced in the regional accreditation outcomes. Only 43.8 per cent of the HEIs, which have undergone the institutional accreditation process, have garnered a Met Rating in the Graduate Attributes and Student Learning Outcome criterion. Hence, this study presupposes its high relevance and usefulness to the work in this area, drawing from the experience of an HEI in Oman.

Practical implications

This study will present the relevant and meaningful content, especially good practices and potential gaps that inform HEIs regarding the current trends, policies, and practices relevant to the assessment of graduate attributes and learning outcomes in higher education.

Originality/value

This study extends the limited literature on the assessment of graduate attributes and learning outcomes, especially among the HEIs in Oman.

Details

International Journal of Educational Management, vol. 34 no. 5
Type: Research Article
ISSN: 0951-354X

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Article
Publication date: 2 August 2021

Abdelaziz Logbi, Mohamed Mani, Toufik Choungara and Abdelouahed Kriker

This paper aims to study the effect of mineral additions on the mortars’ physical, mechanical and durability properties. Two local mineral additions, considered inert, are chosen…

53

Abstract

Purpose

This paper aims to study the effect of mineral additions on the mortars’ physical, mechanical and durability properties. Two local mineral additions, considered inert, are chosen: limestone fillers from North-East of Algeria and natural dune sand from Algerian desert areas.

Design/methodology/approach

Two local additions are finely crushed to a fineness greater or equal to that of the used cement and incorporated into the mortars with predetermined rates; (0, 10%, 15% and 20%) compared to the cement weight to examine their effects on the mortars’ properties at different ages. Two conservation environments are chosen: freshwater as a neutral area and rising water table as an aggressive area to appreciate the effect of the two additions on physical and mechanical properties and durability.

Findings

The results showed the beneficial effect of these additions on compactness, mechanical resistance and durability toward the rising water table. The results have also allowed us to make an experimental comparison between the limestone addition which is commonly used in the Algerian cement industry and the dune sand, which is not yet well explored and exploited.

Originality/value

The added value of this study is the use of crushed dune sand which is a local addition of southern Algeria for improving the resistance of mortars and concrete toward the aggressiveness of rising water table which presents a major problem for the infrastructure of civil and public construction.

Details

World Journal of Engineering, vol. 20 no. 1
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 7 October 2013

Parviz Moradipour, Jamaloddin Noorzaei, Mohd Saleh Jaafar and Farah Nora Aznieta Abdul Aziz

In structural, earthquake and aeronautical engineering and mechanical vibration, the solution of dynamic equations for a structure subjected to dynamic loading leads to a high…

496

Abstract

Purpose

In structural, earthquake and aeronautical engineering and mechanical vibration, the solution of dynamic equations for a structure subjected to dynamic loading leads to a high order system of differential equations. The numerical methods are usually used for integration when either there is dealing with discrete data or there is no analytical solution for the equations. Since the numerical methods with more accuracy and stability give more accurate results in structural responses, there is a need to improve the existing methods or develop new ones. The paper aims to discuss these issues.

Design/methodology/approach

In this paper, a new time integration method is proposed mathematically and numerically, which is accordingly applied to single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) systems. Finally, the results are compared to the existing methods such as Newmark's method and closed form solution.

Findings

It is concluded that, in the proposed method, the data variance of each set of structural responses such as displacement, velocity, or acceleration in different time steps is less than those in Newmark's method, and the proposed method is more accurate and stable than Newmark's method and is capable of analyzing the structure at fewer numbers of iteration or computation cycles, hence less time-consuming.

Originality/value

A new mathematical and numerical time integration method is proposed for the computation of structural responses with higher accuracy and stability, lower data variance, and fewer numbers of iterations for computational cycles.

Details

Journal of Engineering, Design and Technology, vol. 11 no. 3
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 29 January 2025

Sachindra Hewavitharana, Asoka Perera, Srinath Perera, Prasad Perera and Samudaya Nanayakkara

Despite the benefits of enterprise resource planning (ERP) systems, construction organisations in Sri Lanka fail to adopt ERP systems successfully due to functional issues…

8

Abstract

Purpose

Despite the benefits of enterprise resource planning (ERP) systems, construction organisations in Sri Lanka fail to adopt ERP systems successfully due to functional issues. Functional issues arise because of the gap between ERP protocols and construction practices. The purpose of this study is to identify the functional issues in ERP implementation and to propose a framework for the systematic adoption of ERP in the construction industry in Sri Lanka.

Design/methodology/approach

A comprehensive literature review was carried out to identify the issues when adopting ERP protocols into construction practices. These were classified into ten knowledge modules using PMBOK-Version 6 (Project Management Body of Knowledge). Then a questionnaire was developed and validated through an expert forum with five experts. The validated questionnaire was distributed among ERP users in C1-C5 grade construction enterprises in Sri Lanka. Those enterprises were simultaneously operating in multiple construction sites and already experienced ERP implementation. The estimated population was 210 from which 174 responses were received indicating an 82% response rate. Data was analysed using the Chi-Square test.

Findings

The analysis established that there is a significant gap level between ERP protocols and construction practices. The highest significant gap with a Chi-square value of 158.766 exists in the area of inventory management. Other areas such as human resource management (HRM) (142.366), asset management (130.264), finance (126.267), site operations (103.793), project management (53.88), purchasing (34.324), petty cash (28.337), estimating and tendering (22.148) and subcontract management (20.492) show a significant gap level respectively.

Originality/value

The paper establishes comprehensive strategies and a framework developed using the protocols prescribed in webERP (TM) and adopting it to onsite construction practices. webERP (TM) system was developed based on best practices defined in PMBOK (Version 6) and CIDA (Construction Industry Development Authority) specifications for efficient construction practices in Sri Lanka.

Details

Built Environment Project and Asset Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2044-124X

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