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

69 results found

Tubaldi E, Macorini L, Izzuddin BA, SAFETY OF MASONRY ARCH BRIDGES AGAINST FLOOD HAZARD, ARCH'16 Conference

CONFERENCE PAPER

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

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 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

© 2017 Elsevier Ltd Scouring at the base of bridge piers is the major cause of bridge collapses worldwide. Computing the scour risk of bridge foundations is therefore key for a correct management and allocation of resources for maintenance and scour mitigation works. Existing risk-assessment models compute the vulnerability of bridge foundations to scour by comparing the equilibrium scour depth associated with peak-flow discharges characterized by a given return period (usually of 100–200 years) with the critical foundation depth of the bridge. This approach neglects completely the history-dependent and time-dependent nature of scour. Yet, it is well known that bridge collapses can often be induced by the accumulation of scour during multiple flood events. This study aims at developing a novel probabilistic framework for the computation of bridge-pier vulnerability to scour using a Markovian approach to account for memory effects in scour development. The paper focuses on the case of local pier scour occurring in clear-water conditions whereby cumulative effects are significant, well understood and known to be the cause of recent reported bridge collapses. A simplified numerical example consisting of an idealised bridge pier in a canal is considered to clarify the application of the proposed framework and to shed light on the effects of some assumptions introduced to simplify the probabilistic scour assessment.

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 (United States), Vol: 143, ISSN: 0733-9445

© 2017 American Society of Civil Engineers. The research presented in this paper addresses the influence of nonstructural masonry infill on the resistance of multistory buildings to progressive collapse under sudden column loss scenarios. In particular, the structural response of infilled frames in peripheral bays is investigated within the scope of a design-oriented robustness assessment framework previously developed at Imperial College London. This allows due consideration of structural redundancy, ductility, strength, dynamic effects, and energy absorption capabilities in a unified manner. The realistic contribution of masonry panels toward collapse arrest is examined considering the results from full-scale laboratory tests performed on different two-bay frames with brick-masonry infill subjected to incremental pushdown deformation, capturing the dominant deformation mode found following removal of an edge column. In these physical tests, it is observed that the failure mechanisms and damage patterns displayed by the infill panels under pushdown deformation are similar to those activated by lateral pushover loading. Clear evidence of diagonal cracking and shear sliding, eventually culminating in crushing of the compressed corners, is noted. Different infill configurations are tested, including central openings and an initial gap between masonry and frame elements. Overall, a global stable response is observed even in the presence of severe damage in the masonry panels, delivering a monotonic supply of energy absorption with increasing downward displacement. The outcome from this experimental research provides mechanically sound and quantifiable evidence that nonstructural masonry infill panels in peripheral frames offer a reliable and efficient source of enhanced robustness under column loss events. Because of the widespread application of masonry infill panels, this is believed to be particularly relevant within the context of retrofitting operations for r

JOURNAL ARTICLE

Zhang Y, Macorini L, Izzuddin BA, 2017, Numerical investigation of arches in brick-masonry bridges, Structure and Infrastructure Engineering, Pages: 1-19, ISSN: 1573-2479

© 2017 Informa UK Limited, trading as Taylor & Francis Group A significant number of old masonry bridges are still in use and need to be assessed considering current traffic loading and safety requirements. Masonry bridges are complex heterogeneous systems, where masonry arches represent the main components. Thus, a realistic modelling of arches is vital for accurate assessment of masonry bridges. The authors have previously proposed and validated a detailed mesoscale description for masonry arches allowing for the actual masonry bond and the specific arch geometry including the case of skew arches. In this paper, the proposed mesoscale modelling strategy is used in a comprehensive numerical study to investigate the effects of various parameters, including masonry bond and defects in the brickwork, abutment stiffness and movements at the supports, which are usually disregarded in practical assessment of masonry arches and bridges. The results achieved show how these parameters affect the ultimate load capacity, failure mechanisms and initial stiffness of square and skew arches, where the use of detailed 3D mesoscale modelling is critical in providing accurate response predictions under a variety of loading conditions for which reduced models might provide incorrect results.

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

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

Minga E, Macorini L, Izzuddin BA, 2015, Mesoscale modelling of masonry structures using mesh tying, ISSN: 1759-3433

© Civil-Comp Press, 2015. This paper presents an accurate and efficient computational strategy for the simulation of coupled masonry structures which combines a partitioned mesoscale modelling approach for brick-masonry components with a mortar mesh tying method for non-conforming interfaces. This allows the independent modelling of the individual structural components and the efficient tying of the subdomains with accurate transmission of the displacement and stress fields. This strategy enables the optimisation of the individual meshes leading to an increased computational efficiency. Furthermore, the elimination of the mesh compatibility requirement allows the modelling of complex heterogeneous structures. Some numerical examples, including a comparative analysis on the elastic and non-linear response of an infill masonry bridge and the nonlinear simulation of a multi-leaf wall under in plane and out-of-plane loading, are presented to show the effectiveness of the proposed modelling strategy.

CONFERENCE PAPER

Minga E, Macorini L, Izzuddin BA, 2015, Mesoscale modelling of masonry structures using mesh tying, ISSN: 1759-3433

©Civil-Comp Press, 2015. This paper presents an accurate and efficient computational strategy for the simulation of coupled masonry structures which combines a partitioned mesoscale modelling approach for brick-masonry components with a mortar mesh tying method for non-conforming interfaces. This allows the independent modelling of the individual structural components and the efficient tying of the subdomains with accurate transmission of the displacement and stress fields. This strategy enables the optimisation of the individual meshes leading to an increased computational efficiency. Furthermore, the elimination of the mesh compatibility requirement allows the modelling of complex heterogeneous structures. Some numerical examples, including a comparative analysis on the elastic and non-linear response of an infill masonry bridge and the nonlinear simulation of a multi-leaf wall under in plane and out-of-plane loading, are presented to show the effectiveness of the proposed modelling strategy.

CONFERENCE PAPER

Rodriguez-Villares A, Minga E, Macorini L, Izzuddin BAet al., 2015, An automation strategy for mesoscale partitioned analysis of complex masonry structures, ISSN: 1759-3433

© Civil-Comp Press, 2015. Previous research has shown that detailed mesoscale models with nonlinear interfaces can accurately represent the behaviour of unreinforced masonry structures. Nevertheless, this modelling approach is potentially associated with prohibitive computational demands, and consequently an emphasis has been placed almost exclusively on small scale structures. In light of recent developments of effective strategies which reduce the computational cost, this paper presents an automation approach designed to explore the full capacity of such enhancements. A procedure has been developed to perform the automated assembly of generic mesoscale masonry descriptions embedded with advanced domain partitioning features. From a high level of abstraction, this procedure allows the user to define the geometry of an arbitrary masonry structure such as masonry arches, bridges and facades, and to partition the domain by exploiting factorisation conditions. The use of the proposed procedure allows for the practical investigation of complex masonry structures and the comparative study of various partitioning configurations. Examples are presented to demonstrate the potential of the tool, particularly in the investigation of master-slave coupling and hierarchic features.

CONFERENCE PAPER

Rodriguez-Villares A, Minga E, Macorini L, Izzuddin BAet al., 2015, An automation strategy for mesoscale partitioned analysis of complex masonry structures, ISSN: 1759-3433

©Civil-Comp Press, 2015. Previous research has shown that detailed mesoscale models with nonlinear interfaces can accurately represent the behaviour of unreinforced masonry structures. Nevertheless, this modelling approach is potentially associated with prohibitive computational demands, and consequently an emphasis has been placed almost exclusively on small scale structures. In light of recent developments of effective strategies which reduce the computational cost, this paper presents an automation approach designed to explore the full capacity of such enhancements. A procedure has been developed to perform the automated assembly of generic mesoscale masonry descriptions embedded with advanced domain partitioning features. From a high level of abstraction, this procedure allows the user to define the geometry of an arbitrary masonry structure such as masonry arches, bridges and facades, and to partition the domain by exploiting factorisation conditions. The use of the proposed procedure allows for the practical investigation of complex masonry structures and the comparative study of various partitioning configurations. Examples are presented to demonstrate the potential of the tool, particularly in the investigation of master-slave coupling and hierarchic features.

CONFERENCE PAPER

Xavier FB, Macorini L, Izzuddin BA, 2015, Robustness of Multistory Buildings with Masonry Infill, JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES, Vol: 29, ISSN: 0887-3828

JOURNAL ARTICLE

Chisari C, Macorini L, Amadio C, Izzuddin BAet al., 2014, RATIONAL SELECTION OF EXPERIMENTAL DATA FOR INVERSE STRUCTURAL PROBLEMS, 11th World Congress on Computational Mechanics (WCCM) / 5th European Conference on Computational Mechanics (ECCM) / 6th European Conference on Computational Fluid Dynamics (ECFD), Publisher: INT CENTER NUMERICAL METHODS ENGINEERING, Pages: 386-397

CONFERENCE PAPER

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