Imperial College London

DrLorenzoMacorini

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6078l.macorini

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

325Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

81 results found

Demirci C, Malaga-Chuquitaype C, Macorini L, 2018, Seismic drift demands in multi-storey cross-laminated timber buildings, EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, Vol: 47, Pages: 1014-1031, ISSN: 0098-8847

JOURNAL ARTICLE

Minga E, Macorini L, Izzuddin BA, 2018, A 3D mesoscale damage-plasticity approach for masonry structures under cyclic loading, MECCANICA, Vol: 53, Pages: 1591-1611, ISSN: 0025-6455

JOURNAL ARTICLE

Minga E, Macorini L, Izzuddin BA, 2018, Enhanced mesoscale partitioned modelling of heterogeneous masonry structures, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Vol: 113, Pages: 1950-1971, ISSN: 0029-5981

JOURNAL ARTICLE

Tubaldi E, Macorini L, Izzuddin BA, 2018, Three-dimensional mesoscale modelling of multi-span masonry arch bridges subjected to scour, Engineering Structures, Vol: 165, Pages: 486-500, ISSN: 0141-0296

Many masonry arch bridges cross waterways and are built on shallow foundations which are often submerged and exposed to the scouring action of the stream. The limited resistance of masonry arch bridges to foundation settlements makes them very vulnerable to scour and calls for the development of advanced tools for evaluating and improving the capacity against this flood-induced effect. This paper describes a novel three-dimensional modelling strategy for describing the behaviour of multi-span masonry arch bridges subjected to scour at the base of the pier shallow foundations. A mesoscale description is employed for representing the heterogeneous behaviour of masonry units, mortar joints and brick-mortar interfaces, whereas a domain partitioning approach allowing for parallel computation is used to achieve computational efficiency. The scouring process is described via a time-history analysis in which the elements representing the soil are progressively removed from the model according to a specific scour evolution. The proposed modelling approach is first employed to simulate available experimental tests on a dry masonry wall subjected to the settlement of the bearing system and on a reduced scale brick-masonry bridge specimen subjected to scour-induced pier settlements. Subsequently, a numerical example consisting of a multi-span arch bridge subjected to the scouring action is presented to illustrate the potential of the proposed modelling approach and its capabilities for evaluating the vulnerability and risk of masonry arch bridges under flood scenarios.

JOURNAL ARTICLE

Zhang Y, Macorini L, Izzuddin BA, 2018, Numerical investigation of arches in brick-masonry bridges, STRUCTURE AND INFRASTRUCTURE ENGINEERING, Vol: 14, Pages: 14-32, ISSN: 1573-2479

JOURNAL ARTICLE

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2017, Optimal sensor placement for structural parameter identification, STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, Vol: 55, Pages: 647-662, ISSN: 1615-147X

JOURNAL ARTICLE

Demirci C, Malaga Chuquitaype C, Macorini L, 2017, Seismic behaviour and design of tall cross-laminated timber buildings, 16th World Conference on Earthquake Engineering

CONFERENCE PAPER

Gardner L, Yun X, Macorini L, Kucukler Met al., 2017, Hot-Rolled Steel and Steel-Concrete Composite Design Incorporating Strain Hardening, STRUCTURES, Vol: 9, Pages: 21-28, ISSN: 2352-0124

JOURNAL ARTICLE

Lima C, Martinelli E, Macorini L, Izzuddin BAet al., 2017, Modelling beam-to-column joints in seismic analysis of RC frames, EARTHQUAKES AND STRUCTURES, Vol: 12, Pages: 119-133, ISSN: 2092-7614

JOURNAL ARTICLE

Occhipinti G, Izzuddin B, Calio I, Macorini Let al., 2017, Realistic 3D nonlinear dynamic analysis of existing and retrofitted multi-storey RC buildings subject to earthquake loading, Pages: 1685-1699

This paper presents a high fidelity numerical model developed to investigate the seismic performance of an original and retrofitted 10-storey reinforced concrete (RC) framed building. The analysed structure represents a typical existing building in Catania, Italy, which was designed according to old standards to resist gravity and wind loading but not earthquakes. The proposed numerical description adopts beam-column elements for beams and columns and special purpose shell elements for modelling RC floor slabs, both allowing for geometric and material nonlinearity. In order to model the influence of masonry infill, a novel macro-element is developed within a FE framework based on a discrete formulation. 3D nonlinear dynamic simulations are performed considering sets of natural accelerograms acting simultaneously along the two horizontal and the vertical directions and compatible with the design spectrum for the Near Collapse Limit State (NCLS). To improve computational efficiency, which is critical when investigating the nonlinear dynamic behaviour of large structures, the partitioning approach previously developed at Imperial College is adopted, enabling effective parallelisation on HPC systems. The numerical results obtained from the 3D nonlinear dynamic simulations are presented and discussed, focusing on the variation in time of the deformed shape, inter-storey drifts, plastic deformations and internal force distribution, considering or neglecting the infill panel contribution. The original structure showed a very poor seismic performance, where the consideration of the infill panel contribution leads to significant variation in the response. An effective strengthening solution utilising eccentric steel bracings with dissipative shear links is also illustrated and employed to retrofit the original structure. A detailed model of the retrofitting components is also proposed and implemented within the detailed model for the original building. The results of numeric

CONFERENCE PAPER

Setiawan A, Vollum R, Macorini L, 2017, Nonlinear finite element analysis of reinforced concrete flat slabs subjected to reversed-cyclic loading, Pages: 814-822

© Springer International Publishing AG 2018. Flat slabs are only permitted to be used as gravity-load carrying systems in regions of high seismicity because of poor resistance to lateral deformation and punching shear under reversed cyclic loading. This paper considers the influence of reverse cyclic loading on the punching resistance of internal slab column connections without shear reinforcement. Currently, ACI 318-14 determines the deformation capacity of slab-column connections using a best-fit line based on test data from relatively thin slabs, with average thickness of 110 mm, and flexural reinforcement ratios of around 1%. Consequently, the ACI 318-14 (2014) design recommendations require further validation for slab thicknesses and reinforcement ratios outside this range. A possible tool for doing this is the mechanically-based critical shear crack theory (CSCT) of Muttoni (2008). The model is based on considerations of equilibrium and kinematics for an isolated axis-symmetrical slab. The model gives good predictions of punching resistance under concentric loading but its applicability to the design of flat slabs subject to reversed-cyclic loading requires further consideration. The paper presents the results of a parametric study which was carried out with the finite element program ATENA (Cervenka et al. 2007) in order to obtain an improved understanding of the influence of cyclic degradation on punching resistance. Maximum slab rotations are shown to increase under cyclic loading with a consequent degradation in unbalanced moment resistance and ultimate slab rotation. This finding is consistent with the predictions of the CSCT.

CONFERENCE PAPER

Tubaldi E, Macorini L, Izzuddin B, 2017, Flood risk assessment of masonry arch bridges, Pages: 140-153

© 2017 The Authors. Published by Eccomas Proceedia. Floods are one of the most common natural disasters in Europe, responsible for the damage and collapse of many masonry arch bridges built over rivers and canals. The accurate prediction of the safety of these bridges against flood-induced loading is a task of paramount importance for their preservation. This paper describes the framework developed by the authors for the flood risk assessment of masonry arch bridges, accounting for the specific characteristics of the analysed structures, the most critical types of loading associated with floods, and the various sources of uncertainty relevant to the problem. The proposed framework combines the results of flood hazard analysis and of structural vulnerability analysis to obtain the flood risk estimate. A case study consisting of a three-span bridge under scour is considered to illustrate the application of the proposed framework and to show the capabilities of the advanced modelling technique developed for evaluating the effects of flood actions on masonry arch bridges.

CONFERENCE PAPER

Tubaldi E, Macorini L, Izzuddin BA, Manes C, Laio Fet al., 2017, A framework for probabilistic assessment of clear-water scour around bridge piers, STRUCTURAL SAFETY, Vol: 69, Pages: 11-22, ISSN: 0167-4730

JOURNAL ARTICLE

Xavier FB, Macorini L, Izzuddin BA, Chisari C, Gattesco N, Noe S, Amadio Cet al., 2017, Pushdown Tests on Masonry Infilled Frames for Assessment of Building Robustness, JOURNAL OF STRUCTURAL ENGINEERING, Vol: 143, ISSN: 0733-9445

JOURNAL ARTICLE

Gardner L, Kucukler M, Macorini L, 2016, Deformation-Based Design of Composite Beams, 7th International Conference on Composite Construction in Steel and Concrete, Publisher: AMER SOC CIVIL ENGINEERS, Pages: 131-145

CONFERENCE PAPER

Gattesco N, Macorini L, Dudine A, 2016, Experimental Response of Brick-Masonry Spandrels under In-Plane Cyclic Loading, JOURNAL OF STRUCTURAL ENGINEERING, Vol: 142, ISSN: 0733-9445

JOURNAL ARTICLE

Kucukler M, Gardner L, MacOrini L, 2016, Stiffness reduction method for the in-plane design of steel frames, Pages: 99-106

Copyright ©: SDSS'2016. A stiffness reduction method for the in-plane design of steel frames is proposed in this paper. The proposed method is performed by (i) reducing the flexural stiffnesses of the members of a frame on the basis of the first-order forces they withstand and (ii) carrying out Geometrically Nonlinear Analysis. The ultimate capacity of the structure is defined as the point at which the ultimate strength of the most heavily loaded cross-section is reached. Ow-ing to the full consideration of the deleterious influence of the spread of plasticity and imper-fections through stiffness reduction, the proposed approach eliminates the need of using member design equations or modelling member out-of-straightnesses; only cross-section strength checks are required. The verification of the proposed approach against results from the nonlinear finite element modelling of a series of benchmark frames is presented.

CONFERENCE PAPER

Kucukler M, Gardner L, Macorini L, 2016, Development and assessment of a practical stiffness reduction method for the in-plane design of steel frames, JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, Vol: 126, Pages: 187-200, ISSN: 0143-974X

JOURNAL ARTICLE

Rinaldin G, Amadio C, Macorini L, 2016, A macro-model with nonlinear springs for seismic analysis of URM buildings, EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, Vol: 45, Pages: 2261-2281, ISSN: 0098-8847

JOURNAL ARTICLE

Xavier FB, Macorini L, Izzuddin BA, 2016, Contribution of masonry cladding for robustness enhancement of multi-storey buildings under sudden column loss, Pages: 1383-1391

© 2016 Taylor & Francis Group, London. This work addresses the influence of non-structural masonry infill on the resistance of multi-storey buildings to progressive collapse under sudden column loss scenarios. The realistic contribution of masonry panels towards collapse arrest is examined considering the results from full-scale laboratory tests and accurate numerical simulations. Novel real-scale tests are performed on different two-bay frames with brick-masonry infill subjected to incremental pushdown deformation, capturing the dominant deformation mode actually found following removal of an edge column. Different infill configurations are tested, including central openings and initial gaps between masonry and frame elements. Overall, a global stable response is found leading to monotonic energy absorption with increasing vertical deflections. This translates into considerable robustness reserve associated with the confined infill walls. Subsequently, advanced mesoscale finite element simulations are employed to capture the complex frameinfill interaction in the early stages of pushdown response. This modelling strategy is then used on a case study considering a realistic multi-storey frame building with masonry infill. The energy-based robustness assessment framework previously developed at Imperial College London is applied enabling a critical comparison between the collapse resistance arising from different mechanisms typically considered in this context (such as floor membrane and beam catenary effects) and that related to the presence of masonry infill. While the former mechanisms are quite effective at relatively large deformations, the latter is shown to add substantial contribution at small displacements. Given the widespread application of masonry infill, the conclusions in this work are particularly relevant within the context of retrofitting operations for robustness enhancement of existing structures, in view of the growing demand for upgrad

CONFERENCE PAPER

Zhang Y, Macorini L, Izzuddin BA, 2016, Mesoscale partitioned analysis of brick-masonry arches, ENGINEERING STRUCTURES, Vol: 124, Pages: 142-166, ISSN: 0141-0296

JOURNAL ARTICLE

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2015, An inverse analysis procedure for material parameter identification of mortar joints in unreinforced masonry, COMPUTERS & STRUCTURES, Vol: 155, Pages: 97-105, ISSN: 0045-7949

JOURNAL ARTICLE

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2015, An experimental-numerical procedure for the identification of mesoscale material properties for brick-masonry, ISSN: 1759-3433

© Civil-Comp Press, 2015. The response of unreinforced masonry is very complex because of its inherent heterogeneity and nonlinear behaviour, which is governed by the interaction between masonry units and mortar joints. Mesoscale modelling can provide a very good representation of the actual response of masonry structures when using adequate material parameters for the individual components. An attractive strategy has been recently developed by the authors for the calibration of the mesoscale material properties. This is based upon the inverse analysis of the macroscale behaviour of a part of the structure subjected to the pressures exerted by two flatjacks arranged along the mortar bed joints and the perpendicular direction. Thus far this strategy has been applied only to pseudo-experimental data, whereas in this paper it is enhanced considering the experimental results obtained in physical laboratory tests on running bond masonry walls. It is demonstrated that inverse analysis of the measured experimental displacement field allows the estimation of the elastic properties, the cohesion and the friction angle for the interface elements used in the mesoscale description to represent mortar joints.

CONFERENCE PAPER

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2015, An experimental-numerical procedure for the identification of mesoscale material properties for brick-masonry, ISSN: 1759-3433

©Civil-Comp Press, 2015.The response of unreinforced masonry is very complex because of its inherent heterogeneity and nonlinear behaviour, which is governed by the interaction between masonry units and mortar joints. Mesoscale modelling can provide a very good representation of the actual response of masonry structures when using adequate material parameters for the individual components. An attractive strategy has been recently developed by the authors for the calibration of the mesoscale material properties. This is based upon the inverse analysis of the macroscale behaviour of a part of the structure subjected to the pressures exerted by two flatjacks arranged along the mortar bed joints and the perpendicular direction. Thus far this strategy has been applied only to pseudo-experimental data, whereas in this paper it is enhanced considering the experimental results obtained in physical laboratory tests on running bond masonry walls. It is demonstrated that inverse analysis of the measured experimental displacement field allows the estimation of the elastic properties, the cohesion and the friction angle for the interface elements used in the mesoscale description to represent mortar joints.

CONFERENCE PAPER

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2015, An experimental-numerical procedure for the identification of mesoscale material properties for brick-masonry, ISSN: 1759-3433

©Civil-Comp Press, 2015. The response of unreinforced masonry is very complex because of its inherent heterogeneity and nonlinear behaviour, which is governed by the interaction between masonry units and mortar joints. Mesoscale modelling can provide a very good representation of the actual response of masonry structures when using adequate material parameters for the individual components. An attractive strategy has been recently developed by the authors for the calibration of the mesoscale material properties. This is based upon the inverse analysis of the macroscale behaviour of a part of the structure subjected to the pressures exerted by two flatjacks arranged along the mortar bed joints and the perpendicular direction. Thus far this strategy has been applied only to pseudo-experimental data, whereas in this paper it is enhanced considering the experimental results obtained in physical laboratory tests on running bond masonry walls. It is demonstrated that inverse analysis of the measured experimental displacement field allows the estimation of the elastic properties, the cohesion and the friction angle for the interface elements used in the mesoscale description to represent mortar joints.

CONFERENCE PAPER

Gardner L, Yun X, Macorini L, Kucukler Met al., 2015, The continuous strength method for hot-rolled steel and steel-concrete composite design, Eleventh International Conference on Steel Concrete and Hybrid Structures – ASCCS. 3rd-5th December 2015, 8-15. (Keynote)

CONFERENCE PAPER

Gu J, Macorini L, Izzuddin BA, 2015, Response of masonry cavity cladding subject to blast loading, ISSN: 1759-3433

© Civil-Comp Press, 2015. This paper investigates the response of a typical cladding system with masonry cavity walls subject to blast loading and the transfer of the blast loads to the surrounding frame. A recently developed mesoscale mixed-dimensional partitioned modelling framework is adopted, where a detailed mesoscale description for the masonry panels is utilised to achieve the desired accuracy, and a domain-partitioning scheme is adopted to enhance computational efficiency. Two different simplified idealisations representing the parts of the masonry cavity cladding at mid-span and near-column locations are considered to investigate the specific responses of the different parts of the cladding. As the cladding panels show brittle failure modes at the mid-span locations, the restraints provided by the edge columns allow a more ductile failure mode. These different failure characteristics are verified considering the results of a larger model representing the portion of a masonry cavity wall between two adjacent columns in a realistic framed building.

CONFERENCE PAPER

Gu J, Macorini L, Izzuddin BA, 2015, Response of masonry cavity cladding subject to blast loading, ISSN: 1759-3433

©Civil-Comp Press, 2015. This paper investigates the response of a typical cladding system with masonry cavity walls subject to blast loading and the transfer of the blast loads to the surrounding frame. A recently developed mesoscale mixed-dimensional partitioned modelling framework is adopted, where a detailed mesoscale description for the masonry panels is utilised to achieve the desired accuracy, and a domain-partitioning scheme is adopted to enhance computational efficiency. Two different simplified idealisations representing the parts of the masonry cavity cladding at mid-span and near-column locations are considered to investigate the specific responses of the different parts of the cladding. As the cladding panels show brittle failure modes at the mid-span locations, the restraints provided by the edge columns allow a more ductile failure mode. These different failure characteristics are verified considering the results of a larger model representing the portion of a masonry cavity wall between two adjacent columns in a realistic framed building.

CONFERENCE PAPER

Kucukler M, Gardner L, Macorini L, 2015, Lateral-torsional buckling assessment of steel beams through a stiffness reduction method, JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, Vol: 109, Pages: 87-100, ISSN: 0143-974X

JOURNAL ARTICLE

Kucukler M, Gardner L, Macorini L, 2015, Flexural-torsional buckling assessment of steel beam-columns through a stiffness reduction method, ENGINEERING STRUCTURES, Vol: 101, Pages: 662-676, ISSN: 0141-0296

JOURNAL ARTICLE

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