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Size effects in unreinforced and lightly reinforced concrete beams failing in flexure (2021)
Journal Article
Augusthus Nelson, L., Lees, J., & Weekes, L. (2022). Size effects in unreinforced and lightly reinforced concrete beams failing in flexure. Engineering Fracture Mechanics, 259, 107987. https://doi.org/10.1016/j.engfracmech.2021.107987

Fracture-based models commonly use a characteristic length as the basis for determining size effects in concrete beams. The characteristic length is related to the concrete fracture process zone and defined in terms of the concrete fracture propert... Read More about Size effects in unreinforced and lightly reinforced concrete beams failing in flexure.

Progressive collapse: Past, present, future and beyond (2024)
Journal Article
Elkady, N., Augusthus Nelson, L., Weekes, L., Makoond, N., & Buitrago, M. (2024). Progressive collapse: Past, present, future and beyond. Structures, 62, 106131. https://doi.org/10.1016/j.istruc.2024.106131

The world has seen a surge in rigorous study efforts on the progressive collapse of structures in the past few decades. These events have led to new standards and provisions in building codes of practice, many of which are still bei... Read More about Progressive collapse: Past, present, future and beyond.

Sensitivities Of Interfacial Bond-Sip Properties In Predicting The Behaviour Of FRP-Strengthened Concrete (2023)
Conference Proceeding
Augusthus Nelson, L., Weekes, L., & Milani, G. (2023). Sensitivities Of Interfacial Bond-Sip Properties In Predicting The Behaviour Of FRP-Strengthened Concrete. . https://doi.org/10.1007/978-3-031-44603-0_7

The performance of FRP-bonded concrete is heavily influenced by the properties of the bond between the two materials. Various bond-slip models incorporating interfacial bond properties have been developed to understand and predict this behaviour. In... Read More about Sensitivities Of Interfacial Bond-Sip Properties In Predicting The Behaviour Of FRP-Strengthened Concrete.

Generalised analytical solutions for linear and non-linear bond-slip models for externally bonded FRP to a concrete substrate (2023)
Journal Article
Augusthus Nelson, L., Weekes, L., Milani, G., & Al-Allaf, M. (2024). Generalised analytical solutions for linear and non-linear bond-slip models for externally bonded FRP to a concrete substrate. Engineering Structures, 298, https://doi.org/10.1016/j.engstruct.2023.117025

This article presents a set of novel analytical derivations from generalised bond-slip models using first principles, which can be used to predict experimental outcomes, including maximum load resistance, load-slip response, and strain throughout the... Read More about Generalised analytical solutions for linear and non-linear bond-slip models for externally bonded FRP to a concrete substrate.

The effect of metakaolin and hybrid polymers on the microstructure of concrete (2021)
Journal Article
concrete. Periodicals of engineering and natural sciences, 9(1), 162-173

It has been established that metakaolin (MK) can be applied as a supplementary cementitious material and that some polymers can enhance substantial properties of concrete. Previous studies showed that, when used in combination, MK and polymers can... Read More about The effect of metakaolin and hybrid polymers on the microstructure of concrete.

Experimental investigation of the residual behaviour of damaged masonry arch structures (2020)
Journal Article
Augusthus Nelson, L., & Swift, G. (2020). Experimental investigation of the residual behaviour of damaged masonry arch structures. Structures, 27, 2500-2512. https://doi.org/10.1016/j.istruc.2020.08.008

New masonry arch bridges are rarely constructed as part of modern transport networks, however they continue to remain an integral part of modern civil infrastructure due to their overall resilience. This resilience has led to extremely long service l... Read More about Experimental investigation of the residual behaviour of damaged masonry arch structures.

Analytical modelling of bond-slip failure between epoxy bonded FRP and concrete substrate (2020)
Journal Article
Augusthus Nelson, L., Al-Allaf, M., & Weekes, L. (2020). Analytical modelling of bond-slip failure between epoxy bonded FRP and concrete substrate. Composite Structures, 251, 112956. https://doi.org/10.1016/j.compstruct.2020.112596

In this paper, a set of explicit theoretical derivations from a generalised bond-slip model for an epoxy bonded fibre reinforced polymer (FRP) sheet to concrete are presented. The derivations address the maximum bond resistance, load-slip response,... Read More about Analytical modelling of bond-slip failure between epoxy bonded FRP and concrete substrate.

Validation of a finite element modelling approach on soil-foundation-structure interaction of a multi-storey wall-frame structure under dynamic loadings (2020)
Journal Article
Qaftan, O., Toma-Sabbagh, T., Weekes, L., & Augusthus Nelson, L. (2020). Validation of a finite element modelling approach on soil-foundation-structure interaction of a multi-storey wall-frame structure under dynamic loadings. Soil Dynamics and Earthquake Engineering, 131, https://doi.org/10.1016/j.soildyn.2020.106041

Validated numerical approaches are very important in dynamic studies of soil-structure interaction. Experimental outputs of physical models are required to validate the numerical approaches. Testing and analysis of an experimental scaled model is eco... Read More about Validation of a finite element modelling approach on soil-foundation-structure interaction of a multi-storey wall-frame structure under dynamic loadings.

Modeling the behavior of radially pinned brick triplets (2019)
Presentation / Conference
Haynes, J., Naggasa, A., Augusthus-Nelson, L., El-basir, F., & Alsaleh, A. (2019, October). Modeling the behavior of radially pinned brick triplets. Presented at 9th International Conference on Arch Bridges, Porto, Portugal

The continued use of many UK highway and railway masonry arch bridges is dependent upon maintaining robustness as the materials deteriorate over time. A common failure in multi-ring brickwork arches subject to fatigue, is ring separation. This pape... Read More about Modeling the behavior of radially pinned brick triplets.

Sustainable high-performance concrete using metakaolin additive and polymer admixture : mechanical properties, durability and microstructure (2019)
Presentation / Conference
Al Menhosh, A., Wang, Y., Augusthus Nelson, L., Dakhil, A., & Matooq, J. (2019, July). Sustainable high-performance concrete using metakaolin additive and polymer admixture : mechanical properties, durability and microstructure. Presented at 5th International Conference on Sustainable Construction Materials & Technologies, Kingston upon Thames, Surrey, UK

In recent years, there has been a growing interest in the use of supplementary cementitious materials and polymers to produce high-performance concrete. This paper shows the results of a study on the effect of metakaolin and polymer admixture on mech... Read More about Sustainable high-performance concrete using metakaolin additive and polymer admixture : mechanical properties, durability and microstructure.

Modelling the electrical resistivity of concrete with varied water and chloride contents (2019)
Journal Article
Xiang, N., Wang, Y., Oleiwi, H., Chadwick, E., Yao, G., Augusthus Nelson, L., …Shabalin, I. (2020). Modelling the electrical resistivity of concrete with varied water and chloride contents. Magazine of Concrete Research, 72(11), 552-563. https://doi.org/10.1680/jmacr.18.00198

The electrical resistivity of concrete is an important property in the assessment of reinforcement corrosion in concrete and an essential parameter in the design and operation of cathodic protection for reinforced-concrete (RC) structures. Water and... Read More about Modelling the electrical resistivity of concrete with varied water and chloride contents.

An experimental study of cathodic protection for chloride contaminated reinforced concrete (2018)
Journal Article
Oleiwi, H., Wang, Y., Curioni, M., Chen, X., Yao, G., Augusthus Nelson, L., …Shabalin, I. (2018). An experimental study of cathodic protection for chloride contaminated reinforced concrete. Materials and Structures, 51(6), 148. https://doi.org/10.1617/s11527-018-1273-1

Cathodic protection (CP) is being increasingly used on reinforced concrete structures to protect steel reinforcing bars from corrosion in aggressive conditions. Due to the complexity of environmental conditions, the design specifications in national... Read More about An experimental study of cathodic protection for chloride contaminated reinforced concrete.

An experimental study of concrete resistivity and the effects of electrode configuration and current frequency on measurement (2018)
Presentation / Conference
Oleiwi, H., Wang, Y., Xiang, N., Augusthus Nelson, L., Chen, X., & Shabalin, I. (2018, July). An experimental study of concrete resistivity and the effects of electrode configuration and current frequency on measurement. Presented at Sixth International Conference on Durability of Concrete Structures, University of Leeds, UK

Electrical resistivity, a measurable parameter of the state of concrete, plays an important role in the assessment of reinforced concrete structures. An experimental study using two-electrode method has been conducted to evaluate the resistivity of P... Read More about An experimental study of concrete resistivity and the effects of electrode configuration and current frequency on measurement.

Use of finite element analysis to investigate the structural behaviour of masonry arch bridges subject to foundation settlement (2018)
Presentation / Conference
Naggasa, A., Augusthus Nelson, L., & Haynes, B. (2018, July). Use of finite element analysis to investigate the structural behaviour of masonry arch bridges subject to foundation settlement. Presented at 10th International Masonry Conference, Milan, Italy

This paper investigates the effect of foundation settling on masonry arch bridge structural behaviour using Finite Element Analysis (FEA). Masonry arch bridges form a large proportion of existing European infrastructure such as rail and road bridges... Read More about Use of finite element analysis to investigate the structural behaviour of masonry arch bridges subject to foundation settlement.

Experimental & numerical simulation of soil boundary conditions under dynamic effects (2018)
Presentation / Conference
Qaftan, O., Weekes, L., Toma-Sabbagh, T., & Augusthus Nelson, L. (2018, June). Experimental & numerical simulation of soil boundary conditions under dynamic effects. Presented at 16th European Conference on Earthquake Engineering (16ECEE), Thessaloniki, Greece

When conducting earthquake simulation tests, one of the main concerns is the modelling of boundary effects created by artificial boundaries of a soil model container. The function of this soil container is to hold the soil in place during the excitat... Read More about Experimental & numerical simulation of soil boundary conditions under dynamic effects.

Influence of railway loading on the performance of soil-filled masonry arch bridges (2018)
Journal Article
Augusthus Nelson, L., Swift, G., Smith, C., Gilbert, M., & Melbourne, C. (2018). Influence of railway loading on the performance of soil-filled masonry arch bridges. Proceedings of the ICE - Bridge Engineering, 171(4), 276-289. https://doi.org/10.1680/jbren.17.00027

Masonry arch bridges are found in large numbers on the rail networks of Europe and other parts of the world. However, the mode of response of masonry arch structures subjected to railway loading is little understood. To address this, an experimental... Read More about Influence of railway loading on the performance of soil-filled masonry arch bridges.

Shear behaviour of lightweight concrete beams strengthened with CFRP composite (2018)
Journal Article
Al-Allaf, M., Weekes, L., & Augusthus Nelson, L. (2019). Shear behaviour of lightweight concrete beams strengthened with CFRP composite. Magazine of Concrete Research, 71(18), 949-964. https://doi.org/10.1680/jmacr.17.00488

This paper presents the experimental results obtained from lightweight and normal concrete beams with closed and U-shaped configurations of epoxy bonded Carbon FRP (CFRP) reinforcement in order to compare the shear resisting mechanisms between lightw... Read More about Shear behaviour of lightweight concrete beams strengthened with CFRP composite.

Long term durability properties of concrete modified with metakaolin and polymer admixture (2018)
Journal Article
Al Menhosh, A., Wang, Y., Wang, Y., & Augusthus Nelson, L. (2018). Long term durability properties of concrete modified with metakaolin and polymer admixture. Construction and Building Materials, 172, 41-51. https://doi.org/10.1016/j.conbuildmat.2018.03.215

Previous studies show that both metakaolin (MK) and polymer can respectively improve certain mechanical and durability properties of concrete. Also, recent studies show that a combination of MK and polymer further enhances the mechanical properties b... Read More about Long term durability properties of concrete modified with metakaolin and polymer admixture.

Experimental study of cathodic protection for reinforced concrete submerged in saline water (2017)
Presentation / Conference
Oleiwi, H., Wang, Y., Curioni, M., Augusthus Nelson, L., Chen, X., & Shabalin, I. (2017, September). Experimental study of cathodic protection for reinforced concrete submerged in saline water. Presented at 20th International Corrosion Congress & Process Safety Congress (EUROCORR 2017), Prague

Cathodic protection (CP) has been approved in practice to be an effective technique to protect steel reinforcement in concrete from corrosion under severe environmental conditions. Using constant current for CP is the most popular approach in practic... Read More about Experimental study of cathodic protection for reinforced concrete submerged in saline water.

An experimental study of the cathodic polarization of the reinforcement in chloride contaminated concrete (2017)
Presentation / Conference
Oleiwi, H., Wang, Y., Curioni, M., Augusthus Nelson, L., Chen, X., & Shabalin, I. (2017, September). An experimental study of the cathodic polarization of the reinforcement in chloride contaminated concrete. Presented at 20th International Corrosion Congress & Process Safety Congress (EUROCORR 2017), Prague

This paper reports an experimental study on the influence of chloride contamination on the polarization resistance, concrete resistivity, and the potential shift of concrete reinforcement under different cathodic protection (CP) current densities. Re... Read More about An experimental study of the cathodic polarization of the reinforcement in chloride contaminated concrete.

Large-scale physical modelling of soil-filled masonry arch bridges (2017)
Journal Article
masonry arch bridges. International Journal of Physical Modelling in Geotechnics, 18(2), 81-94. https://doi.org/10.1680/jphmg.16.00037

The presence of soil backfill has been shown to have a significant influence on the load-carrying capacity of masonry arch bridges, with the soil fill providing a number of important functions, including inter alia, the distribution of surface load... Read More about Large-scale physical modelling of soil-filled masonry arch bridges.

Theoretical assessment of progressive collapse capacity of reinforced concrete structures (2016)
Journal Article
Alogla, K., Weekes, L., & Augusthus Nelson, L. (2017). Theoretical assessment of progressive collapse capacity of reinforced concrete structures. Magazine of Concrete Research, 69(3), 145-162. https://doi.org/10.1680/jmacr.16.00319

The progressive collapse behaviour of reinforced concrete (RC) structures requires consideration of material and geometric non-linearity, concrete crushing and rebar fracture. Compressive arch action (CAA) and catenary action (CTA) are the main res... Read More about Theoretical assessment of progressive collapse capacity of reinforced concrete structures.

Behaviour of backfilled masonry arch bridges subjected to cyclic loading (2016)
Presentation / Conference
Augusthus Nelson, L., Swift, G., Smith, C., Gilbert, M., & Melbourne, C. (2016, October). Behaviour of backfilled masonry arch bridges subjected to cyclic loading. Presented at 8th International Conference on Arch Bridges, Wrocław, Poland

Experimental research has demonstrated that the interaction between soil fill surrounding the arch barrel of a masonry arch bridge structure has a significant influence on ultimate limit state behaviour. However, little work has been carried out to... Read More about Behaviour of backfilled masonry arch bridges subjected to cyclic loading.

Proposed permissible limit state assessment criteria for masonry arch bridges (2016)
Presentation / Conference
Gilbert, M., Melbourne, C., Smith, C., Augusthus Nelson, L., & Swift, G. (2016, October). Proposed permissible limit state assessment criteria for masonry arch bridges. Presented at ARCH '16. Proceedings of the 8th International Conference on Arch Bridges, Wroclaw, Poland

The Ultimate Limit State (ULS) is commonly used when assessing masonry arch bridges. Traditionally one or more, relatively large, partial factors are applied to the ULS to determine the level of service loading that can be safely applied to a given b... Read More about Proposed permissible limit state assessment criteria for masonry arch bridges.

A new mitigation scheme to resist progressive collapse of RC structures (2016)
Journal Article
Alogla, K., Weekes, L., & Augusthus Nelson, L. (2016). A new mitigation scheme to resist progressive collapse of RC structures. Construction and Building Materials, 125, 533-545. https://doi.org/10.1016/j.conbuildmat.2016.08.084

Reinforced concrete structures may be vulnerable to progressive collapse due to lack of sufficient continuous reinforcement. In most guidelines, general structural integrity requirements to reduce progressive collapse have been introduced, but the de... Read More about A new mitigation scheme to resist progressive collapse of RC structures.

Progressive collapse resisting mechanisms of reinforced concrete structures (2016)
Presentation / Conference
Alogla, K., Weekes, L., & Augusthus Nelson, L. (2016, July). Progressive collapse resisting mechanisms of reinforced concrete structures. Presented at New Trends on Integrity, Reliability and Failure, Porto/Portugal

Reinforced concrete (RC) buildings may be vulnerable to progressive collapse due to lack of sufficient continuous reinforcement. Progressive collapse is a situation when local failure is followed by collapse of adjoining members, which in turn caus... Read More about Progressive collapse resisting mechanisms of reinforced concrete structures.

An experimental investigation into the bond-slip behaviour between CFRP composite and lightweight concrete (2016)
Journal Article
Mustafa, A., Weekes, L., Augusthus Nelson, L., & Leach, P. (2016). An experimental investigation into the bond-slip behaviour between CFRP composite and lightweight concrete. Construction and Building Materials, 113, 15-27. https://doi.org/10.1016/j.conbuildmat.2016.03.032

Epoxy bonded fibre reinforced polymer (FRP) composites are widely used for the retrofit of ailing reinforced concrete structures, for both shear and flexure. The behaviour of retrofitted concrete structures is governed by the bond strength and the ma... Read More about An experimental investigation into the bond-slip behaviour between CFRP composite and lightweight concrete.

Two-dimensional experimental and numerical modelling of a soil-filled masonry arch (2015)
Book Chapter
Ahmad, S., Augusthus Nelson, L., & Swift, G. (2015). Two-dimensional experimental and numerical modelling of a soil-filled masonry arch. In Geotechnical Engineering for Infrastructure and Development: XVI European Conference on Soil Mechanics and Geotechnical Engineering. ICE Publishing

The ultimate load carrying capactiy of soil-filled masonry arches is significantly higher than that of bare masonry arches. The soil fill has a stabalising effect on the masonry arch, distributing the live load and providing passive resistance to def... Read More about Two-dimensional experimental and numerical modelling of a soil-filled masonry arch.

Experimental study on bond-sip behaviour between CFRP sheets and lightweight concrete (2015)
Presentation / Conference
Mustafa, A., Weekes, L., & Augusthus Nelson, L. (2015, September). Experimental study on bond-sip behaviour between CFRP sheets and lightweight concrete. Presented at ACIC 2015, Cambridge, UK

Epoxy bonded fibre reinforced polymer (FRP) composites are widely used for the retrofit of ailing reinforced concrete structures, for both shear and flexure. The behaviour of retrofitted concrete structures is governed by the bond and material charac... Read More about Experimental study on bond-sip behaviour between CFRP sheets and lightweight concrete.

Residual capacity of damaged masonry arch bridges subjected to cyclic loading (2014)
Presentation / Conference
Augusthus Nelson, L., & Swift, G. (2014, July). Residual capacity of damaged masonry arch bridges subjected to cyclic loading. Presented at 9th International Masonry Conference, Guimarães, Portugal

In order to assess the stability of damaged arch structures, the residual capacity of damaged arch bridges needs to be established. This paper reports on two full-scale masonry arches, back-filled with crushed limestone, that were tested up to failur... Read More about Residual capacity of damaged masonry arch bridges subjected to cyclic loading.

Discontinuous analysis of soil-arch interaction in masonry arch bridges (2014)
Presentation / Conference
Ahmad, S., Swift, G., & Augusthus Nelson, L. (2014, July). Discontinuous analysis of soil-arch interaction in masonry arch bridges. Presented at 9th International Masonry Conference, Guimarães, Portugal

Back-filled masonry arches behave in a discontinuous manner, where deformation is governed by interaction at joints and the soil-masonry interface. A discrete element approach is used in order to explicitly model the interactions at discontinuities.... Read More about Discontinuous analysis of soil-arch interaction in masonry arch bridges.

Influence of the span rise ratio on the capacity of masonry arch bridges (2014)
Presentation / Conference
Donaghy, J., Wang, J., & Augusthus Nelson, L. (2014, July). Influence of the span rise ratio on the capacity of masonry arch bridges. Presented at 9th International Masonry Conference, Guimarães, Portugal

Current standards promote a holistic approach in appraisal of masonry arch bridges. This is derived from the aspect of a perfect arch with specific span rise ratios. The MEXE (Military Engineering Experimental Establishment) method used as first stag... Read More about Influence of the span rise ratio on the capacity of masonry arch bridges.

Physical modelling of cyclically loaded masonry arch bridges (2013)
Presentation / Conference
Swift, G., Augusthus Nelson, L., Melbourne, C., & Gilbert, M. (2013, October). Physical modelling of cyclically loaded masonry arch bridges. Presented at 7th International Conference on Arch Bridges, Trogi-Split, Croatia

Experimental work involving large-scale physical models of backfilled masonry arch bridges is being undertaken to examine the behaviour of these structures under cyclic loading regimes. The aim of this research is to better understand the relationshi... Read More about Physical modelling of cyclically loaded masonry arch bridges.