Marianna Loli

Marianna Loli
University of Surrey · Faculty of Engineering and Physical Sciences

PhD
Marie Curie Research Fellow

About

39
Publications
10,599
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666
Citations
Introduction
Marianna Loli currently works at the Department of Civil and Environmental Engineering of the University of Surrey. Her expertise includes centrifuge and 1-g physical modelling, Finite Element simulation and analytical modelling, with research interests in the analysis of natural hazards and risk.

Publications

Publications (39)
Article
Bridges are the most vulnerable assets of our transport networks. They are disproportionately exposed to and hit by multiple natural hazards, with flooding being the leading cause of bridge failures in the world. Their performance is constantly challenged by the combined effects of natural hazard stressors, e.g. flash floods, exacerbated by climate...
Article
Full-text available
Flash floods are common manifestations of extreme weather events and one of the most severe natural hazards. In Europe, they have been responsible for 359 fatalities and an economic loss totalling 67 million USD in the past decade (EM-DAT), while their increasing severity is linked to climate change. Nevertheless, flash floods remain a poorly docum...
Article
Full-text available
Thawing weakens the frozen soil supporting buildings and lifelines from Siberia to Alaska, resulting in settlements up to hundreds of millimetres during a single season. This paper presents a simplified sequentially coupled numerical approach that can be implemented in a general purpose, commercially available finite-element analysis model. It is i...
Technical Report
Full-text available
On September 17-20 2020 Medicane Ianos impacted Greece. The Medicane was associated with significant wind speeds, and precipitation. The amount of precipitation during a duration of about ~48 hrs was among the highest recorded in certain areas and exceeded in certain areas the mean annual precipitation. The extent of the affected area was very larg...
Technical Report
Full-text available
Classical monuments are often founded upon deposits of very soft soil or upon the debris of ancient cities, the deformability of which can significantly affect their seismic response. Focusing on monuments which are prone to experiencing overturning failure, the role of soft soil on seismic performance is investigated through dynamic time history a...
Article
Retaining walls mechanically stabilized with reinforcement frequently have proven their resilience while maintaining an advantage over conventional (gravity and cantilever) walls in terms of cost effectiveness and environmental impact. To achieve optimized design beyond the inherently conservative code specifications, reliable pullout models are ne...
Presentation
Full-text available
PhD thesis defence: presentation
Preprint
Full-text available
Thawing weakens the soil supporting buildings and lifelines from Siberia to Alaska, while the consequent consolidation settlements may reach up to hundreds of millimetres during a single season. A simplified sequentially–coupled numerical approach is presented and implemented in a general purpose commercially available FE code. It is intended to pr...
Preprint
Full-text available
The safety of fuel-carrying pipelines crossing a seismogenic fault that has the potential for large dislocation is of crucial importance to the environment. The paper studies parametrically the response of such operating pipelines to normal and reverse faulting, using an experimentally-validated finite element methodology. The experiments are perfo...
Article
Strong earthquakes threaten civil structures through ground shaking and, sometimes, due to the outcrop of the causative fault. A number of hybrid foundation schemes that have been found helpful in protecting a structure against strong shaking are evaluated with respect to their effectiveness in reducing the impact of tectonic displacements as well....
Conference Paper
There are soil-structure interaction problems for which it is important to model both the relative soil-structure stiffness and strength. Examples from the earthquake engineering field include the design of resilient rocking-isolated foundations and the seismic stabilisation of slopes using piling. In both cases the aim is to ensure a preferred fai...
Conference Paper
Full-text available
Mechanically Stabilized Earth (MSE) retaining systems have become increasingly popular because they combine resilience with cost effectiveness and low environmental impact. Their capacity in lateral loading (pull-out resistance) is a critical design parameter, especially in cases where seismic loading has to be considered. The pull-out test is a ve...
Conference Paper
Full-text available
The dynamic rocking response of simple systems is studied in 3D accounting for: (a) the simultaneous action of the three seismic components of motion, and (b) the complex combination of sliding, twisting, uplifting, and jumping motion of such systems. A rectangular block with dimensions B (length) x B (width) x H (height) on top of a rigid base is...
Conference Paper
Full-text available
Earthquakes of significant magnitude are often characterized by spectacular manifestations of the tectonic hazard. Surface reflections of the causative fault often interact with foundation-structure systems causing excessive permanent deformations and failure, even in cases of structures designed according to modern code requirements. Based on the...
Conference Paper
Full-text available
A preceding experimental study carried out at the University of Dundee, as well as independent experimental and numerical research results, have shown the improved seismic performance of rocking shallow foundations in comparison to conventional, conservatively designed foundations. By properly reducing the size of the footing, rocking behavior due...
Conference Paper
A hybrid foundation for offshore wind turbines has recently been proposed, combining a monopile with a light-weight circular footing. The latter is composed of steel plates and stiffeners forming compartments, backfilled to increase the vertical load. A key aspect is a special pile–footing connection, which allows transfer of lateral loads and mome...
Conference Paper
Full-text available
Evidence from recent earthquakes has shown that quay walls are particularly vulnerable to seismic shaking. Being key components of commercial and passenger ports, their seismic damage may incur pronounced direct and indirect losses. To make things worse, the vast majority of ports in Europe’s high-seismicity areas (e.g., Greece, Italy), were design...
Conference Paper
Full-text available
A preceding experimental study carried out at the University of Dundee, as well as independent experimental and numerical research results, have shown the improved seismic performance of rocking shallow foundations in comparison to conventional, conservatively designed foundations, for bridges. By properly reducing the size of the footing, rocking...
Conference Paper
Full-text available
Evidence from recent earthquakes has shown that quay walls are particularly vulnerable to seismic shaking. Being key components of commercial and passenger ports, their seismic damage may incur pronounced direct and indirect losses. To make things worse, the vast majority of ports in Europe's high-seismicity areas (e.g., Greece, Italy), were design...
Thesis
Full-text available
The dissertation provides theoretical and experimental support to the concept of deliberately seismically under-designing shallow foundations to invoke strong below-ground nonlinearity in the form of rocking, and thereby render RC structures safe under intense seismic excitation. To this end, (I) A series of small-scale (1-g) and centrifuge tests a...
Article
The response of historic masonry buildings to tectonic ground displacements is studied through analysis of a simple yet representative soil–foundation–masonry wall system. A nonlinear 3D finite element method is developed and employed to reproduce the strong nonlinear response of the rupturing soil, as well as the masonry structure. Following a sen...
Article
Full-text available
When undertaking centrifuge studies on seismic soil–structure interaction, it is useful to be able to define the pseudo-static ‘pushover’ response of the structure. Normally, this requires separate centrifuge experiments with horizontal actuators. This paper describes an alternative procedure, using Ricker ground motions to obtain the pushover resp...
Article
Full-text available
Experimental proof is provided of an unconventional seismic design concept, which is based on deliberately underdesigning shallow foundations to promote intense rocking oscillations and thereby to dramatically improve the seismic resilience of structures. Termed rocking isolation, this new seismic design philosophy is investigated through a series...
Conference Paper
Full-text available
The concept of under-designing shallow foundations to promote intense rocking oscillations and thereby improve the seismic resilience of bridge piers is investigated experimentally. Results from a series of dynamic centrifuge experiments on properly-scaled (1:50) models of reinforced concrete (RC) bridge piers on medium density sand are presented....
Article
Full-text available
The assessment of historical elements at risk from earthquake loading presents a 10 number of differences from the seismic evaluation of modern structures, for design or retrofitting 11 purposes, which is covered by existing building codes, and for the development of fragility curves, 12 procedures for which have been extensively developed in the p...
Conference Paper
This paper has the twin aim of presenting the new Actidyn Q67-2 shaker installed at the University of Dundee, with consideration of motion replication and repeatability, and also to demonstrate one particular advantage of the "real earthquake" motion capability in validating and enhancing learning from earthquake case histories. Case histories of l...
Conference Paper
Full-text available
When conducting studies of seismic soil-structure interaction, it is useful to be able to define the pseudo-static ‘push-over’ response of the structure under static horizontal loads representing the structural inertia. Normally, this would require separate centrifuge experiments with horizontal actuators attached. This paper describes an alternati...
Article
This article studies the seismic performance of a rocking-isolated bridge pier on surface foundation, resting on sand. A series of reduced-scale shaking table tests are conducted, comparing the performance of a rocking-isolated system to a pier founded on conventionally designed foundation. The two design alternatives are subjected to a variety of...
Article
Recent studies have highlighted the beneficial role of foundation uplifting and the potential effectiveness of guiding the plastic hinge into the foundation soil by allowing full mobilization of bearing capacity during strong seismic shaking. With the inertia loading transmitted onto the superstructure being limited by the capacity of the foundatio...
Conference Paper
The response of historic masonry buildings subjected to tectonically induced ground distress is studied through analysis of a simple yet representative soil–foundation–masonry wall system. A hybrid methodology is adopted to rigorously account for the multiple response nonlinearities, combining a validated 3D FE model for simulation of fault rupture...
Article
Full-text available
Dramatic failures have occurred in recent earthquakes as a result of the interplay of surface structures with out-cropping fault ruptures, highlighting the need to account for fault-induced loading in seismic design. Current research into the mechanisms of fault rupture-foundation-structure interaction has revealed a potentially favourable role of...
Article
Recent large-magnitude (M>7) earthquakes have caused numerous failures induced by surface faulting, demonstrating the need to account for tectonic deformation in seismic design. Thanks to their usually high rigidity, embedded (e.g., caisson) foundations may divert the fault rupture and lead to favorable performance, whereas surface or piled foundat...
Article
A new seismic design philosophy is illuminated, taking advantage of soil "failure" to protect the superstructure. Instead of over-designing the foundation to ensure that the loading stemming from the structural inertia can be "safely" transmitted onto the soil (as with conventional capacity design), and then reinforce the superstructure to avoid co...

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Projects

Projects (10)
Project
Development of a Decision Support System for increasing the Resilience of Road Infrastructure based on combined use of terrestrial and airborne sensors and advanced modelling tools.
Project
H2020-MSCA Marie-Sklodowska-Curie IF research grant aiming to deliver realistic flood intensity measures for bridges; fragility models taking into account variations in scour depth, debris built-up and ageing; novel multi-parameter restoration functions; and test-applications on two different road networks in the EU.
Project
Development and validation of a 3D numerical methodology for simulation of thawing consolidation of permafrost ground.