In this paper, a challenging retrofit intervention on an existing traditional un-reinforced mason... more In this paper, a challenging retrofit intervention on an existing traditional un-reinforced masonry building is illustrated.The building showed an advanced state of degradation of front walls, with detachment of plaster and possible fall of ornamentations. The diagnosis phase has also shown that: the floor structures were not fixed to the masonry walls and, in many cases, the steel beams were
A dynamic system with memory is a system for which knowledge of the equations of motion, together... more A dynamic system with memory is a system for which knowledge of the equations of motion, together with the state at a given time instant t 0 is insufficient to predict the evolution of the state at time instants t>t 0 . To calculate the response of systems with memory starting from an initial ...
In this paper the results of a test program devoted to the assessment of the cyclic behavior of b... more In this paper the results of a test program devoted to the assessment of the cyclic behavior of beam-to-column welded connections are presented. The specimens are representative of the common European practice, which differs from both U.S. and Japan practice, due to the size of the connected members and to the welding technique and details. Three specimen groups, characterized by different values of the relative column-beam-panel zone strengths, are designed and tested under different loading histories. In particular six tests ͑five cyclic and one monotonic͒ have been carried out on each group of specimens, encompassing a total of 18 tests. The tests have evidenced the effect of column-to-beam strength ratio and of panel zone design on the cyclic behavior and failure modes of the connections. Furthermore the dependence of the absorbed energy and cumulative plastic rotation of the joint upon the applied loading history is shown. Finally design implications are suggested on the basis of the test results.
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 1 2009 Isbn 978 0 415 55804 4 Pags 15 24, 2009
... provided in the following figures, where the labels of the single curves are the abbreviation... more ... provided in the following figures, where the labels of the single curves are the abbreviation of the church names: S. Giovanni Maggiore (SGM), S. Gio-vanni a Mare ... Brandonisio, G., De Luca, A., de Lucia, R., Giordano, A., Mele, E., 2008, Limit analysis of masonry portal arches, ...
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 2 2009 Isbn 978 0 415 55805 1 Pags 1215 1220, 2009
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 2 2009 Isbn 978 0 415 55805 1 Pags 1121 1126, 2009
ABSTRACT The paper deals with the problem of evaluating the in-plane seismic capacity of unreinfo... more ABSTRACT The paper deals with the problem of evaluating the in-plane seismic capacity of unreinforced masonry portal frame, which can be considered the basic structural element in historical buildings. In particular, the Limit Analysis approach is used to provide simplified “closed form” expressions of the horizontal collapse multiplier, also taking into account the eventual contribution of steel tie rods. Both sliding shear and shear diagonal cracking are also considered in order to take into account the shear failure modes of the pier walls.
Diagrid structures for tall buildings are very popular among engineers and architects, thanks to ... more Diagrid structures for tall buildings are very popular among engineers and architects, thanks to the inherent qualities of structural efficiency, decorative attributes and morphological versatility. However limited academic research have been developed with focus on the structural behavior, design criteria and performance assessment of this structural system; further, the scientific contributions in literature mainly concern regular diagrids, i.e. patterns characterized by constant geometrical attributes of the base module (width and height, angle, scale). In this paper, a first step toward a systematic and comprehensive study of geometrical patterns for diagrids is provided. For this purpose, diagrid structures characterized by regular patterns are compared to alternative geometrical configurations, obtained by changing the angle of diagonals (variable-angle, VA) as well as by changing the number of diagonal (variable-density, VD) along the building height. Eight different diagrid patterns are generated and designed for a 90-story model building, according to procedures either provided in the literature or suggested by the authors. The resulting diagrid structures are assessed under gravity and wind loads and various performance parameters are evaluated on the basis of the analyses results. The comparison in terms of structural weights and performances finally allows for discussing efficiency potentials of the different patterns.
Abstract: In this paper, the realisation of a reinforced concrete variable-thickness skew vault b... more Abstract: In this paper, the realisation of a reinforced concrete variable-thickness skew vault bridge recently awarded a special mention at AICAP 2009 Prize is illustrated. In the paper special attention is focussed on the material used (self-compacting concrete with special ...
ABSTRACT In this paper the authors define a framework for assessing the “local” structural issues... more ABSTRACT In this paper the authors define a framework for assessing the “local” structural issues in the design of diagrid tall buildings, and present a methodology for establishing the need for a specific secondary bracing system (SBS) as a function of the diagrid geometry. Further, design criteria for secondary bracing systems are worked out and applied to some 90 story building models, characterized by perimeter diagrid structures with different module height and diagonal cross sections. The outcomes of the proposed simplified procedures, both for assessing SBS necessity and for the consequent SBS member design, have been compared to the structural response of the diagrid building models, obtained without and with SBS, demonstrating both the accuracy of the proposed formulations and the primary importance of the discussed local questions. In fact, all analyzed diagrid models exhibited problems concerning stability of interior columns (i.e. multi-storey buckling modes) and/or local flexibility (excessive interstory drift); the above local problems are completely solved after the introduction of a SBS at the central core location, and, against a modest increase of structural weight (about 3%), any flexural engagements in the diagrid member is eliminated.
... USA. [2] Brandonisio, G, Cuomo, G, De Lucia, R, De Luca, A, Giordano A, Mele, E, and Santanie... more ... USA. [2] Brandonisio, G, Cuomo, G, De Lucia, R, De Luca, A, Giordano A, Mele, E, and Santaniello, R (2008). Basilica-type buildings: seismic vulnerability and application of base isolation. CISM, International Centre For Mechanical Sciences. ...
In this paper the results of a test program devoted to the assessment of the cyclic behavior of b... more In this paper the results of a test program devoted to the assessment of the cyclic behavior of beam-to-column welded connections are presented. The specimens are representative of the common European practice, which differs from both U.S. and Japan practice, due to the size of the connected members and to the welding technique and details. Three specimen groups, characterized by different values of the relative column-beam-panel zone strengths, are designed and tested under different loading histories. In particular six tests ͑five cyclic and one monotonic͒ have been carried out on each group of specimens, encompassing a total of 18 tests. The tests have evidenced the effect of column-to-beam strength ratio and of panel zone design on the cyclic behavior and failure modes of the connections. Furthermore the dependence of the absorbed energy and cumulative plastic rotation of the joint upon the applied loading history is shown. Finally design implications are suggested on the basis of the test results.
ABSTRACT The equation of motion of linear dynamic systems with viscoelastic memory is usually exp... more ABSTRACT The equation of motion of linear dynamic systems with viscoelastic memory is usually expressed in a integrodifferential form, and its numerical solution is computationally heavy. In two recent papers, the writers suggested that the system memory be accounted for through the introduction of a number of additional internal variables. Following this approach, the motion of the system is governed by a set of first-order, linear differential equations, whose solution is quite easy. In this paper, the approach is extended to single-degree-of-freedom systems subjected to random, nonstationary excitation. The equations governing the time variation of the second-order statistics are derived, and an effective step-by-step solution procedure is proposed. Numerical example shows the accuracy of the procedure for white and nonwhite excitations.
In this paper, a challenging retrofit intervention on an existing traditional un-reinforced mason... more In this paper, a challenging retrofit intervention on an existing traditional un-reinforced masonry building is illustrated.The building showed an advanced state of degradation of front walls, with detachment of plaster and possible fall of ornamentations. The diagnosis phase has also shown that: the floor structures were not fixed to the masonry walls and, in many cases, the steel beams were
A dynamic system with memory is a system for which knowledge of the equations of motion, together... more A dynamic system with memory is a system for which knowledge of the equations of motion, together with the state at a given time instant t 0 is insufficient to predict the evolution of the state at time instants t>t 0 . To calculate the response of systems with memory starting from an initial ...
In this paper the results of a test program devoted to the assessment of the cyclic behavior of b... more In this paper the results of a test program devoted to the assessment of the cyclic behavior of beam-to-column welded connections are presented. The specimens are representative of the common European practice, which differs from both U.S. and Japan practice, due to the size of the connected members and to the welding technique and details. Three specimen groups, characterized by different values of the relative column-beam-panel zone strengths, are designed and tested under different loading histories. In particular six tests ͑five cyclic and one monotonic͒ have been carried out on each group of specimens, encompassing a total of 18 tests. The tests have evidenced the effect of column-to-beam strength ratio and of panel zone design on the cyclic behavior and failure modes of the connections. Furthermore the dependence of the absorbed energy and cumulative plastic rotation of the joint upon the applied loading history is shown. Finally design implications are suggested on the basis of the test results.
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 1 2009 Isbn 978 0 415 55804 4 Pags 15 24, 2009
... provided in the following figures, where the labels of the single curves are the abbreviation... more ... provided in the following figures, where the labels of the single curves are the abbreviation of the church names: S. Giovanni Maggiore (SGM), S. Gio-vanni a Mare ... Brandonisio, G., De Luca, A., de Lucia, R., Giordano, A., Mele, E., 2008, Limit analysis of masonry portal arches, ...
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 2 2009 Isbn 978 0 415 55805 1 Pags 1215 1220, 2009
Protection of Historical Buildings Proceedings of the International Conference on Protection of Historical Buildings Prohitech 09 Rome Italy 21 24 June 2009 Prohitech 09 Vol 2 2009 Isbn 978 0 415 55805 1 Pags 1121 1126, 2009
ABSTRACT The paper deals with the problem of evaluating the in-plane seismic capacity of unreinfo... more ABSTRACT The paper deals with the problem of evaluating the in-plane seismic capacity of unreinforced masonry portal frame, which can be considered the basic structural element in historical buildings. In particular, the Limit Analysis approach is used to provide simplified “closed form” expressions of the horizontal collapse multiplier, also taking into account the eventual contribution of steel tie rods. Both sliding shear and shear diagonal cracking are also considered in order to take into account the shear failure modes of the pier walls.
Diagrid structures for tall buildings are very popular among engineers and architects, thanks to ... more Diagrid structures for tall buildings are very popular among engineers and architects, thanks to the inherent qualities of structural efficiency, decorative attributes and morphological versatility. However limited academic research have been developed with focus on the structural behavior, design criteria and performance assessment of this structural system; further, the scientific contributions in literature mainly concern regular diagrids, i.e. patterns characterized by constant geometrical attributes of the base module (width and height, angle, scale). In this paper, a first step toward a systematic and comprehensive study of geometrical patterns for diagrids is provided. For this purpose, diagrid structures characterized by regular patterns are compared to alternative geometrical configurations, obtained by changing the angle of diagonals (variable-angle, VA) as well as by changing the number of diagonal (variable-density, VD) along the building height. Eight different diagrid patterns are generated and designed for a 90-story model building, according to procedures either provided in the literature or suggested by the authors. The resulting diagrid structures are assessed under gravity and wind loads and various performance parameters are evaluated on the basis of the analyses results. The comparison in terms of structural weights and performances finally allows for discussing efficiency potentials of the different patterns.
Abstract: In this paper, the realisation of a reinforced concrete variable-thickness skew vault b... more Abstract: In this paper, the realisation of a reinforced concrete variable-thickness skew vault bridge recently awarded a special mention at AICAP 2009 Prize is illustrated. In the paper special attention is focussed on the material used (self-compacting concrete with special ...
ABSTRACT In this paper the authors define a framework for assessing the “local” structural issues... more ABSTRACT In this paper the authors define a framework for assessing the “local” structural issues in the design of diagrid tall buildings, and present a methodology for establishing the need for a specific secondary bracing system (SBS) as a function of the diagrid geometry. Further, design criteria for secondary bracing systems are worked out and applied to some 90 story building models, characterized by perimeter diagrid structures with different module height and diagonal cross sections. The outcomes of the proposed simplified procedures, both for assessing SBS necessity and for the consequent SBS member design, have been compared to the structural response of the diagrid building models, obtained without and with SBS, demonstrating both the accuracy of the proposed formulations and the primary importance of the discussed local questions. In fact, all analyzed diagrid models exhibited problems concerning stability of interior columns (i.e. multi-storey buckling modes) and/or local flexibility (excessive interstory drift); the above local problems are completely solved after the introduction of a SBS at the central core location, and, against a modest increase of structural weight (about 3%), any flexural engagements in the diagrid member is eliminated.
... USA. [2] Brandonisio, G, Cuomo, G, De Lucia, R, De Luca, A, Giordano A, Mele, E, and Santanie... more ... USA. [2] Brandonisio, G, Cuomo, G, De Lucia, R, De Luca, A, Giordano A, Mele, E, and Santaniello, R (2008). Basilica-type buildings: seismic vulnerability and application of base isolation. CISM, International Centre For Mechanical Sciences. ...
In this paper the results of a test program devoted to the assessment of the cyclic behavior of b... more In this paper the results of a test program devoted to the assessment of the cyclic behavior of beam-to-column welded connections are presented. The specimens are representative of the common European practice, which differs from both U.S. and Japan practice, due to the size of the connected members and to the welding technique and details. Three specimen groups, characterized by different values of the relative column-beam-panel zone strengths, are designed and tested under different loading histories. In particular six tests ͑five cyclic and one monotonic͒ have been carried out on each group of specimens, encompassing a total of 18 tests. The tests have evidenced the effect of column-to-beam strength ratio and of panel zone design on the cyclic behavior and failure modes of the connections. Furthermore the dependence of the absorbed energy and cumulative plastic rotation of the joint upon the applied loading history is shown. Finally design implications are suggested on the basis of the test results.
ABSTRACT The equation of motion of linear dynamic systems with viscoelastic memory is usually exp... more ABSTRACT The equation of motion of linear dynamic systems with viscoelastic memory is usually expressed in a integrodifferential form, and its numerical solution is computationally heavy. In two recent papers, the writers suggested that the system memory be accounted for through the introduction of a number of additional internal variables. Following this approach, the motion of the system is governed by a set of first-order, linear differential equations, whose solution is quite easy. In this paper, the approach is extended to single-degree-of-freedom systems subjected to random, nonstationary excitation. The equations governing the time variation of the second-order statistics are derived, and an effective step-by-step solution procedure is proposed. Numerical example shows the accuracy of the procedure for white and nonwhite excitations.
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Papers by Antonello Luca