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Dr. Laddu Bhagya Jayasinghe
Research Group for Solid Structures, Department of Engineering, University of Luxembourg, L- 4364 Esch sur Alzette, Luxembourg

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Research Keywords & Expertise

0 concrete structures
0 soil–structure interaction
0 Building information modelling
0 Sustainability in construction
0 Finite element methods in structural dynamics

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Building information modelling

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Journal article
Published: 21 April 2021 in Results in Materials
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– Good insulation materials have low thermal conductivity which is mainly related with the density of the material. Bio-composite insulation materials contribute to reduce the environmental footprint of buildings. The main goal of this study is to study the effectiveness of a self-growing, bio-composite building insulation material made of Miscanthus x giganteus and the mushroom Mycelium. Different mix proportions of Miscanthus and Mycelium were considered to identify the most suitable mixture to produce a porous composite which has a lower density. Scanning electron microscopy images were used to evaluate the microstructural geometry of the composite material. Thermal conductivity test was conducted on eight composite plates, and the results showed that the thermal conductivity of this new material is between 0.0882 and 0.104 Wm−1K−1. Moreover, other experiments were carried out to characterize the density, compressive strength and water absorption. In addition, fire resistant tests on composite plates with and without render were conducted, and it was found that the composite plates belong to the category EI15 according to the EN13501–2:2003. The initial results were found to be satisfactory to make a sustainable insulation material out of Miscanthus and Mycelium.

ACS Style

Patrick Pereira Dias; Laddu Bhagya Jayasinghe; Daniele Waldmann. Investigation of Mycelium-Miscanthus composites as building insulation material. Results in Materials 2021, 10, 100189 .

AMA Style

Patrick Pereira Dias, Laddu Bhagya Jayasinghe, Daniele Waldmann. Investigation of Mycelium-Miscanthus composites as building insulation material. Results in Materials. 2021; 10 ():100189.

Chicago/Turabian Style

Patrick Pereira Dias; Laddu Bhagya Jayasinghe; Daniele Waldmann. 2021. "Investigation of Mycelium-Miscanthus composites as building insulation material." Results in Materials 10, no. : 100189.

Review
Published: 28 March 2020 in Sustainability
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This article is the second part of a two-part study, which explored the extent to which Building Information Modelling (BIM) is used for End-of-Lifecycle (EoL) scenario selection to minimise the Construction and Demolition Waste (CDW). The conventional literature review presented here is based on the conceptual landscape that was obtained from the bibliometric and scientometric analysis in the first part of the study. Seven main academic research directions concerning the BIM-based EoL domain were found, including social and cultural factors, BIM-based Design for Deconstruction (DfD), BIM-based deconstruction, BIM-based EoL within LCA, BIM-aided waste management, Material and Component Banks (M/C Banks), off-site construction, interoperability and Industry Foundation Classes (IFC). The analysis highlights research gaps in the path of raw materials to reusable materials, i.e., from the deconstruction to M/C banks to DfD-based designs and then again to deconstruction. BIM-based EoL is suffering from a lack of a global framework. The existing solutions are based on local waste management policies and case-specific sustainability criteria selection. Another drawback of these ad hoc but well-developed BIM-based EoL prototypes is their use of specific proprietary BIM tools to support their framework. This disconnection between BIM tools and EoL tools is reportedly hindering the BIM-based EoL, while no IFC classes support the EoL phase information exchange.

ACS Style

Arghavan Akbarieh; Laddu Bhagya Jayasinghe; Danièle Waldmann; Felix Norman Teferle. BIM-Based End-of-Lifecycle Decision Making and Digital Deconstruction: Literature Review. Sustainability 2020, 12, 2670 .

AMA Style

Arghavan Akbarieh, Laddu Bhagya Jayasinghe, Danièle Waldmann, Felix Norman Teferle. BIM-Based End-of-Lifecycle Decision Making and Digital Deconstruction: Literature Review. Sustainability. 2020; 12 (7):2670.

Chicago/Turabian Style

Arghavan Akbarieh; Laddu Bhagya Jayasinghe; Danièle Waldmann; Felix Norman Teferle. 2020. "BIM-Based End-of-Lifecycle Decision Making and Digital Deconstruction: Literature Review." Sustainability 12, no. 7: 2670.

Journal article
Published: 27 February 2020 in Sustainability
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The construction industry consumes an enormous amount of global resources and produces more waste than any other sector. The need to move toward sustainable development in construction requires significant changes in construction and demolition (C&D) waste management. The estimation of waste, recycling materials and reusable components could be vital in waste management, achieving huge efficiency in the construction industry. Moreover, a typical building comprises of an extensive amount of materials and components with various characteristics. This study proposes a Building Information Modelling (BIM)-based system to allow the circular economy by storing information of the materials and components of buildings and by effectively managing the recycling of materials and reuse of components. A tool which serves as a Material and Component (M&C) bank was developed with PHP and MYSQL by making use of a web browser able to extract the materials and component information of a building through the BIM model. This information is vital for several uses such as quantification of C&D waste and assessing for the design for deconstruction. It can also be used to obtain the information of the reusable condition of the components and instructions for the reconstruction.

ACS Style

Laddu Bhagya Jayasinghe; Daniele Waldmann. Development of a BIM-Based Web Tool as a Material and Component Bank for a Sustainable Construction Industry. Sustainability 2020, 12, 1766 .

AMA Style

Laddu Bhagya Jayasinghe, Daniele Waldmann. Development of a BIM-Based Web Tool as a Material and Component Bank for a Sustainable Construction Industry. Sustainability. 2020; 12 (5):1766.

Chicago/Turabian Style

Laddu Bhagya Jayasinghe; Daniele Waldmann. 2020. "Development of a BIM-Based Web Tool as a Material and Component Bank for a Sustainable Construction Industry." Sustainability 12, no. 5: 1766.

Journal article
Published: 21 February 2020 in Applied Mechanics
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Pile punching (or driving) affects the surrounding area where piles and adjacent piles can be displaced out of their original positions, due to horizontal loads, thereby leading to hazardous outcomes. This paper presents a three-dimensional (3D) coupled Smoothed Particle Hydrodynamics and Finite Element Method (SPH-FEM) model, which was established to investigate pile punching and its impact on adjacent piles subjected to lateral loads. This approach handles the large distortions by avoiding mesh tangling and remeshing, contributing greatly high computational efficiency. The SPH-FEM model was validated against field measurements. The results of this study indicated that the soil type in which piles were embedded affected the interaction between piles during the pile punching. A comprehensive parametric study was carried out to evaluate the impact of soil properties on the displacement of piles due to the punching of an adjacent pile. It was found that the interaction between piles was comparatively weak when the piles were driven in stiff clays; while the pile-soil interactions were much more significant in sandy soils and soft clays.

ACS Style

Laddu Bhagya Jayasinghe; Daniele Waldmann; Junlong Shang. Impact of Pile Punching on Adjacent Piles: Insights from a 3D Coupled SPH-FEM Analysis. Applied Mechanics 2020, 1, 47 -58.

AMA Style

Laddu Bhagya Jayasinghe, Daniele Waldmann, Junlong Shang. Impact of Pile Punching on Adjacent Piles: Insights from a 3D Coupled SPH-FEM Analysis. Applied Mechanics. 2020; 1 (1):47-58.

Chicago/Turabian Style

Laddu Bhagya Jayasinghe; Daniele Waldmann; Junlong Shang. 2020. "Impact of Pile Punching on Adjacent Piles: Insights from a 3D Coupled SPH-FEM Analysis." Applied Mechanics 1, no. 1: 47-58.

Journal article
Published: 12 February 2020 in Sustainability
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Buildings are being demolished without taking into the account the waste generated, and the housing shortage problem is getting more critical as cities are growing and the demand for built space and the use of resources are increasing. Architectural projects have been using prefabrication and modular systems to solve these problems. However, there is an absence of structures that can be disassembled and reused when the structure’s life ran its course. This paper presents three building prototypes of new recyclable architectural typologies: (i) a Slab prototype designed as a shelf structure where wooden housing modules can be plugged in and out, (ii) a Tower prototype allowing for an easy change of layout and use of different floors and (iii) a Demountable prototype characterized by the entire demountability of the building. These typologies combine modularity, flexibility, and disassembling to address the increasing demands for multi-use, re-usable and resource-efficient constructions. Design, drawings, plans, and 3D models are developed, tested and analyzed as a part of the research. The results show that the implementation of the recyclable architectural concept at the first design stage is feasible and realistic, and ensures the adaptation through time, increases life span, usability and the material reusability, while avoiding demolition, which in turn reduces the construction waste and, consequently, the CO2 emissions.

ACS Style

Marielle Ferreira Silva; Laddu Bhagya Jayasinghe; Daniele Waldmann; Florian Hertweck. Recyclable Architecture: Prefabricated and Recyclable Typologies. Sustainability 2020, 12, 1342 .

AMA Style

Marielle Ferreira Silva, Laddu Bhagya Jayasinghe, Daniele Waldmann, Florian Hertweck. Recyclable Architecture: Prefabricated and Recyclable Typologies. Sustainability. 2020; 12 (4):1342.

Chicago/Turabian Style

Marielle Ferreira Silva; Laddu Bhagya Jayasinghe; Daniele Waldmann; Florian Hertweck. 2020. "Recyclable Architecture: Prefabricated and Recyclable Typologies." Sustainability 12, no. 4: 1342.

Journal article
Published: 01 December 2019 in Theoretical and Applied Fracture Mechanics
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ACS Style

Junlong Shang; Bhagya Jayasinghe; Fei Xiao; Kang Duan; Wen Nie; Zhiye Zhao. Three-dimensional DEM investigation of the fracture behaviour of thermally degraded rocks with consideration of material anisotropy. Theoretical and Applied Fracture Mechanics 2019, 104, 1 .

AMA Style

Junlong Shang, Bhagya Jayasinghe, Fei Xiao, Kang Duan, Wen Nie, Zhiye Zhao. Three-dimensional DEM investigation of the fracture behaviour of thermally degraded rocks with consideration of material anisotropy. Theoretical and Applied Fracture Mechanics. 2019; 104 ():1.

Chicago/Turabian Style

Junlong Shang; Bhagya Jayasinghe; Fei Xiao; Kang Duan; Wen Nie; Zhiye Zhao. 2019. "Three-dimensional DEM investigation of the fracture behaviour of thermally degraded rocks with consideration of material anisotropy." Theoretical and Applied Fracture Mechanics 104, no. : 1.

Journal article
Published: 14 August 2019 in Computers and Geotechnics
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This paper presents a 3D coupled Smoothed Particle Hydrodynamics (SPH) and Finite Element Method (FEM) model, which was developed to investigate the extent of damage zone and fracture patterns in rock due to blasting. The RHT material model was used to simulate the blasting-induced damage in rock. The effects of discontinuity persistence and high in-situ stresses on the evolution of blasting-induced damage were investigated. Results of this study indicate that discontinuity persistence and spatial distribution of rock bridges have a significant influence on the evolution of blasting-induced damage. Furthermore, high in-situ stresses also have a significant influence on the propagation of blasting-induced fractures, as well as the patterns of fracture networks. It is also shown that the blasting-induced cracks are often induced along the direction of the applied high initial stresses. Moreover, additional cracks are normally generated at the edges of the rock bridges probably due to the relatively high stress concentration.

ACS Style

Bhagya Jayasinghe; Junlong Shang; Zhiye Zhao; A.T.C. Goh. Numerical investigation into the blasting-induced damage characteristics of rocks considering the role of in-situ stresses and discontinuity persistence. Computers and Geotechnics 2019, 116, 103207 .

AMA Style

Bhagya Jayasinghe, Junlong Shang, Zhiye Zhao, A.T.C. Goh. Numerical investigation into the blasting-induced damage characteristics of rocks considering the role of in-situ stresses and discontinuity persistence. Computers and Geotechnics. 2019; 116 ():103207.

Chicago/Turabian Style

Bhagya Jayasinghe; Junlong Shang; Zhiye Zhao; A.T.C. Goh. 2019. "Numerical investigation into the blasting-induced damage characteristics of rocks considering the role of in-situ stresses and discontinuity persistence." Computers and Geotechnics 116, no. : 103207.

Journal article
Published: 17 August 2018 in Soil Dynamics and Earthquake Engineering
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A series of field tests using controlled blasting was conducted at a location in the North Western part of Singapore to assess the behaviour of pile foundations subjected to ground excitation. The field tests involved three piles with different pile head fixity conditions. The piles were instrumented with strain gauges to evaluate the bending moments and axial force along the piles. For the fixed-head piles, the maximum bending moment occurred at the pile head level. For free-head pile exhibited higher bending moments close to the mid-height of the pile and zero bending moment at the pile head due to the absence of restraints at the top. For all cases, the axial force was maximum at the pile head.

ACS Style

Bhagya Jayasinghe; Z.Y. Zhao; Anthony Goh; H.Y. Zhou; Y.L. Gui; M. Tao. A field study on pile response to blast-induced ground motion. Soil Dynamics and Earthquake Engineering 2018, 114, 568 -575.

AMA Style

Bhagya Jayasinghe, Z.Y. Zhao, Anthony Goh, H.Y. Zhou, Y.L. Gui, M. Tao. A field study on pile response to blast-induced ground motion. Soil Dynamics and Earthquake Engineering. 2018; 114 ():568-575.

Chicago/Turabian Style

Bhagya Jayasinghe; Z.Y. Zhao; Anthony Goh; H.Y. Zhou; Y.L. Gui; M. Tao. 2018. "A field study on pile response to blast-induced ground motion." Soil Dynamics and Earthquake Engineering 114, no. : 568-575.

Journal article
Published: 01 January 2018 in International Journal of Rock Mechanics and Mining Sciences
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ACS Style

Y.L. Gui; Z.Y. Zhao; Bhagya Jayasinghe; H.Y. Zhou; Anthony Goh; M. Tao. Blast wave induced spatial variation of ground vibration considering field geological conditions. International Journal of Rock Mechanics and Mining Sciences 2018, 101, 63 -68.

AMA Style

Y.L. Gui, Z.Y. Zhao, Bhagya Jayasinghe, H.Y. Zhou, Anthony Goh, M. Tao. Blast wave induced spatial variation of ground vibration considering field geological conditions. International Journal of Rock Mechanics and Mining Sciences. 2018; 101 ():63-68.

Chicago/Turabian Style

Y.L. Gui; Z.Y. Zhao; Bhagya Jayasinghe; H.Y. Zhou; Anthony Goh; M. Tao. 2018. "Blast wave induced spatial variation of ground vibration considering field geological conditions." International Journal of Rock Mechanics and Mining Sciences 101, no. : 63-68.

Journal article
Published: 01 January 2017 in Procedia Engineering
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ACS Style

Y.L. Gui; Z.Y. Zhao; H.Y. Zhou; Anthony Goh; Bhagya Jayasinghe. Numerical Simulation of Rock Blasting Induced Free Field Vibration. Procedia Engineering 2017, 191, 451 -457.

AMA Style

Y.L. Gui, Z.Y. Zhao, H.Y. Zhou, Anthony Goh, Bhagya Jayasinghe. Numerical Simulation of Rock Blasting Induced Free Field Vibration. Procedia Engineering. 2017; 191 ():451-457.

Chicago/Turabian Style

Y.L. Gui; Z.Y. Zhao; H.Y. Zhou; Anthony Goh; Bhagya Jayasinghe. 2017. "Numerical Simulation of Rock Blasting Induced Free Field Vibration." Procedia Engineering 191, no. : 451-457.

Journal article
Published: 04 October 2016 in Computers and Geotechnics
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Blasting has been widely used in mining and construction industries for rock breaking. Ground vibration induced by blasting is an inevitable side effect that may cause damage to nearby structures, if not properly controlled. In this study, response and possible damage of rock-socketed pile near soil-rock interface subjected to ground shock excitations are investigated and quantified with coupled SPH-FEM method. Results indicate that the base of the pile is relatively vulnerable and that the soil properties significantly influence on response of pile subjected to a specific blast load. Furthermore, based on the numerical results, ground vibration attenuation equation is proposed.

ACS Style

Bhagya Jayasinghe; H.Y. Zhou; A.T.C. Goh; Zhiye Zhao; Y.L. Gui. Pile response subjected to rock blasting induced ground vibration near soil-rock interface. Computers and Geotechnics 2016, 82, 1 -15.

AMA Style

Bhagya Jayasinghe, H.Y. Zhou, A.T.C. Goh, Zhiye Zhao, Y.L. Gui. Pile response subjected to rock blasting induced ground vibration near soil-rock interface. Computers and Geotechnics. 2016; 82 ():1-15.

Chicago/Turabian Style

Bhagya Jayasinghe; H.Y. Zhou; A.T.C. Goh; Zhiye Zhao; Y.L. Gui. 2016. "Pile response subjected to rock blasting induced ground vibration near soil-rock interface." Computers and Geotechnics 82, no. : 1-15.

Journal article
Published: 01 August 2014 in Structural Engineering International
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This paper develops and presents a fully coupled nonlinear finite element (FE) procedure to treat the response of piles to ground shocks induced by underground explosions. The Arbitrary Lagrange Euler coupling formulation is used in the study with proper state material parameters and equations. Pile responses in four different soil types, viz, saturated soil, partially saturated soil, and loose and dense dry soils are investigated and the results compared. Numerical results are validated by comparing them with those from a standard design manual. Blast wave propagation in soils, horizontal pile deformations, and damages in the pile are presented. Pile damage presented through plastic strain diagrams will enable vulnerability assessment of the piles under the blast scenarios considered. The numerical results indicate that the blast performance of single pile foundations embedded in saturated soil and loose dry soil are more severe than those embedded in partially saturated soil and dense dry soil. The present findings can serve as a benchmark reference for future analysis and design.

ACS Style

Laddu Bhagya Jayasinghe; David Thambiratnam; Nimal J. Perera; Ruwan Jayasooriya. Effect of Soil Properties on the Response of Pile to Underground Explosion. Structural Engineering International 2014, 24, 361 -370.

AMA Style

Laddu Bhagya Jayasinghe, David Thambiratnam, Nimal J. Perera, Ruwan Jayasooriya. Effect of Soil Properties on the Response of Pile to Underground Explosion. Structural Engineering International. 2014; 24 (3):361-370.

Chicago/Turabian Style

Laddu Bhagya Jayasinghe; David Thambiratnam; Nimal J. Perera; Ruwan Jayasooriya. 2014. "Effect of Soil Properties on the Response of Pile to Underground Explosion." Structural Engineering International 24, no. 3: 361-370.

Journal article
Published: 04 February 2014 in Computers & Structures
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Pile foundations transfer loads from superstructures to stronger sub soil. Their strength and stability can hence affect structural safety. This paper treats the response of reinforced concrete pile in saturated sand to a buried explosion. Fully coupled computer simulation techniques are used together with five different material models. Influence of reinforcement on pile response is investigated and important safety parameters of horizontal deformations and tensile stresses in the pile are evaluated. Results indicate that adequate longitudinal reinforcement and proper detailing of transverse reinforcement can reduce pile damage. Present findings can serve as a benchmark reference for future analysis and design.

ACS Style

Bhagya Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. Blast response of reinforced concrete pile using fully coupled computer simulation techniques. Computers & Structures 2014, 135, 40 -49.

AMA Style

Bhagya Jayasinghe, D.P. Thambiratnam, N. Perera, J.H.A.R. Jayasooriya. Blast response of reinforced concrete pile using fully coupled computer simulation techniques. Computers & Structures. 2014; 135 ():40-49.

Chicago/Turabian Style

Bhagya Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. 2014. "Blast response of reinforced concrete pile using fully coupled computer simulation techniques." Computers & Structures 135, no. : 40-49.

Journal article
Published: 03 February 2014 in Engineering Failure Analysis
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This paper presents the response of pile foundations to ground shocks induced by surface explosion using fully coupled and non-linear dynamic computer simulation techniques together with different material models for the explosive, air, soil and pile. It uses the Arbitrary Lagrange Euler coupling formulation with proper state material parameters and equations. Blast wave propagation in soil, horizontal pile deformation and pile damage are presented to facilitate failure evaluation of piles. Effects of end restraint of pile head and the number and spacing of piles within a group on their blast response and potential failure are investigated. The techniques developed and applied in this paper and its findings provide valuable information on the blast response and failure evaluation of piles and will provide guidance in their future analysis and design.

ACS Style

L.B. Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. Blast response and failure analysis of pile foundations subjected to surface explosion. Engineering Failure Analysis 2014, 39, 41 -54.

AMA Style

L.B. Jayasinghe, D.P. Thambiratnam, N. Perera, J.H.A.R. Jayasooriya. Blast response and failure analysis of pile foundations subjected to surface explosion. Engineering Failure Analysis. 2014; 39 ():41-54.

Chicago/Turabian Style

L.B. Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. 2014. "Blast response and failure analysis of pile foundations subjected to surface explosion." Engineering Failure Analysis 39, no. : 41-54.

Journal article
Published: 15 April 2013 in Computers & Structures
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This paper treats the blast response of a pile foundation in saturated sand using explicit nonlinear finite element analysis, considering complex material behavior of soil and soil–pile interaction. Blast wave propagation in the soil is studied and the horizontal deformation of pile and effective stresses in the pile are presented. Results indicate that the upper part of the pile to be vulnerable and the pile response decays with distance from the explosive. The findings of this research provide valuable information on the effects of underground explosions on pile foundation and will guide future development, validation and application of computer models.

ACS Style

Bhagya Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. Computer simulation of underground blast response of pile in saturated soil. Computers & Structures 2013, 120, 86 -95.

AMA Style

Bhagya Jayasinghe, D.P. Thambiratnam, N. Perera, J.H.A.R. Jayasooriya. Computer simulation of underground blast response of pile in saturated soil. Computers & Structures. 2013; 120 ():86-95.

Chicago/Turabian Style

Bhagya Jayasinghe; D.P. Thambiratnam; N. Perera; J.H.A.R. Jayasooriya. 2013. "Computer simulation of underground blast response of pile in saturated soil." Computers & Structures 120, no. : 86-95.