R. Zandonini | University of Trento (original) (raw)
Papers by R. Zandonini
European Commission, Mar 1, 2021
The present deliverable reflects the outcome of the activities conducted in the framework of Task... more The present deliverable reflects the outcome of the activities conducted in the framework of Task 2.1 of WP 2 of the FAILNOMORE project. The objective of this specific task was to derive practice-oriented design approaches from the information collected in Deliverable 1-2, i.e. the background document. Within the present document, these practice-oriented design approaches are reported in two parts: - Part 1 (from Section 1 to Section 4) entitled “Find my way” which groups the design recommendations to help the designer in the identification of the approaches to be considered in the context of a design for robustness and; - Part 2 (Sections 5 and 6) entitled “Tool box” which provides the designer with the required information to apply the different design approaches addressed in Part 1. In the next step of the FAILNOMORE project, the applicability of the proposed design approaches will be illustrated through the worked examples (Task 2-2). Then, the dissemination materials made of a design manual (including the design recommendations and the worked examples) and of PowerPoint presentations will be prepared (Task 2-3) taking into account of the outcomes from Tasks 2.1 and 2.2
The numerical recalculation performed on the slab, beam and joint tests as well as the analytical... more The numerical recalculation performed on the slab, beam and joint tests as well as the analytical recalculation of these tests have been employed as support for the experimental investigations represented within the previous chapter. In particular, numerical and analytical analysis have been performed to design the experimental test and the test setup for the symmetric and the asymmetric 3D test performed by UTRE. For the 2D-frame tests a numerical simulation was performed and the analytical model was validated. In addition to the recalculation of the experimental investigations on composite joints some parameters were varied in order to evaluate the influence on the behavior of the composite joints. Furthermore an analytical approach to predict the response of joints subjected to M-N-loading was investigated. In addition, analytical calculations have been performed in order to predict the results of the static and dynamic experimental tests
Guidelines for the collection & preparation of material and suggestions for manuscript,
Introductory notes. Composite connections - Finite element modelling of partially restrained beam... more Introductory notes. Composite connections - Finite element modelling of partially restrained beam-to-girder connections, C.O. Rex, W.S.Easterling, Prediction method for moment-rotation behaviour of composite beam to steel column connection, Ping Ren,M. Crisinel. Special connections - Connection between steel beams and concrete filled R.H.S. based on the stud technique (threaded stud), D. Vandegans, J. Janss, Seismic performance of CFT column-to-WF beam moment connections, J.M. Ricles et al, The static strength and behaviour of multiplanar I-beam to tubular column connections loaded with in-plane bending moments, G.D. de Winkel et al. Design methods - Strength of moment end-plate connections with multiple bolt rows at the beam tension flange, T.M. Murray, J.T. Borgsmiller, Estimates of ductility requirements for simple shear connections , W.A. Thornton, Mechanical modelling of semi-rigid joints for the analysis of framed steel and composite structures, F. Tschemmernegg, G. Queiroz. M...
International Journal for Computational Methods in Engineering Science and Mechanics, 2018
The disasters happened in recent past pointed out the need of design criteria, ensuring adequate ... more The disasters happened in recent past pointed out the need of design criteria, ensuring adequate safety levels against progressive collapse. The attention was focused on the behavior of composite beam-to-column joint components in the field of large displacements. This article presents the experimental and numerical study enabling the simulation of the RC elements under tension. This has helped in understanding the non-negligible contribution of concrete in tension stiffening response up to failure especially in the case of discontinuous geometry marked in composite structures. The finite element model proposed may be considered a midway between smeared and discrete crack modeling approaches.
Innovation in Engineering for Seismic Regions
This study is concerned with evaluating the response of single pile subjected to cyclic horizonta... more This study is concerned with evaluating the response of single pile subjected to cyclic horizontal uniaxial loading. Combination of lateral cyclic loading and constant vertical or lateral load in twoorthogonal directions is also studied. Moreover, the influence of one-and two-way loading, number of cycles and the intensity of constant load in conjunction with the cyclic lateral load is presented. The study is further continued by comparing the performance of long and short single pile embedded in clayey soil. A series of three-dimensional finite element models using ANSYS code are conducted to model three-dimensional transient analysis as well as the complicated soil pile interaction. In order to verify the validity numerical model, the numerical response is compared with reported results obtained by experimental cyclic load test performed on single pile penetrated in soft clay. Results show strong coupling between the two-orthogonal direction of lateral loading that decreases the lateral pile capacity. The interaction relation of biaxial loading with the factor b = 1.2 and 1.15 for one-and two-way loading respectively may well approximate the analysis results. The results of study are presented in terms of lateral cyclic capacities, pile head deflection, displacement profile and bending moment over the pile length.
IABSE Symposium, Budapest 2006: Responding to Tomorrow's Challenges in Structural Engineering, 2006
In view of recent disasters and their immense economical and human consequences such as the flood... more In view of recent disasters and their immense economical and human consequences such as the flood catastrophe in South East Asia or the constant threat by international terrorism more and more focus is given not only on the safety of structures-to reduce the risk for the life of people by collapse even under exceptional loading-but on minimising the disastrous results and to enable a quick rebuilding and reuse. One crucial mean to achieve this aim is the design of redundant robust structures. Robustness prevents the collapse of the total structure when only parts of the structure are damaged or destroyed. To avoid progressive failure, redundant structures with inherent sufficient ductile behaviour allowing deformations when a local failure occurs, have to be built. Redundancy can be achieved by allowing force redistribution within a structural system. Therefore the single sections and joints have to be especially designed and optimised, not necessarily requiring additional fabrication costs. Steel is a preferable building material for robust structures because of its ductile properties. But until now no specific rules for robustness by ductile joints exist. The aim of the present project is to define general requirements for ductile joints as part of a structural system subjected to exceptional unforseen loading.
Proceedings of the 10th Pacific Structural Steel Conference (PSSC 2013), 2013
Advances in Steel Structures (ICASS '99), 1999
Publisher Summary Beam-to-column joints remarkably influence the overall response of the frame an... more Publisher Summary Beam-to-column joints remarkably influence the overall response of the frame and, as a consequence, the possibility to take into account accurately their behavior is of great importance for structural design. This chapter presents some approaches to monitor the damage and to assess the failure of beam-to-column steel joints under seismic loading, via low-cycle fatigue approaches, which have been recently proposed and validated with reference to steel components (members and joints) under cyclic loading. The considered approaches are based on the selection of a suitable parameter (S) capable to represent the global joint behavior and require the experimental definition of S-N (number of cycles at collapse) fatigue resistance curves on the basis of cyclic loading histories, which have to be suitably selected. Design analysis of frames in seismic zones is allowed by means of two alternative methods: nonlinear dynamic analysis under real or synthetic accelerograms, and linear dynamic analysis to verify the safety of the structure based on its response to a design spectrum.
ABSTRACT The last years were characterized by a growing interest about the development of strateg... more ABSTRACT The last years were characterized by a growing interest about the development of strategies for the mitigation of the damages caused by accidental events. Accidental actions can be resisted by residual strength and alternate load path methods and combination of these strategies can lead to an effective and cost efficient design procedure for progressive collapse mitigation by redistributing the loads within the structure. One of the main objective of these strategies is the development of structural systems able to activate mechanisms to transfer the loads from the damaged to the undamaged part of the structure. This paper illustrates the preliminary work carried on within a European Research Project, aimed at developing new design concepts for steel-concrete composite frames against accidental actions. The first part of the study investigates the behavior of two geometrically different steel-concrete 3-D composite frames subjected to the loss of an internal column. Two full-scale experimental tests will be performed on a part of these structure. By simulating the total loss of the impacted column, the experiments enable investigation of the redundancy of the 3-D slab system in terms of activation of membrane effects. The present paper presents the preliminary study for the design of the tests.
ABSTRACT Pallet racks from the structural point of view, can be considered typical steel framed s... more ABSTRACT Pallet racks from the structural point of view, can be considered typical steel framed structures. Their design is usually performed adopting 2-D simplified models related to the main frame directions: i.e. down-aisle and cross-aisle direction. The frame stability in down-aisle direction, where usually bracing systems are missing, is ensured by the degree of continuity provided by joints (i.e. beam-to column and base-plate joints). The rack joints behaviour appears quite complex and the main Standards for pallet racks (i.e., AS, FEM, RAL, RMI) suggest specific tests to suitably characterise their performances. At the University of Trento, in the framework of a research work of pallet racks, a research on the response of base-plate joints under axial eccentric load (base-plate connection test) is currently in progress. In this paper the on-going activity is presented and the preliminary results are briefly discussed.
European Commission, Mar 1, 2021
The present deliverable reflects the outcome of the activities conducted in the framework of Task... more The present deliverable reflects the outcome of the activities conducted in the framework of Task 2.1 of WP 2 of the FAILNOMORE project. The objective of this specific task was to derive practice-oriented design approaches from the information collected in Deliverable 1-2, i.e. the background document. Within the present document, these practice-oriented design approaches are reported in two parts: - Part 1 (from Section 1 to Section 4) entitled “Find my way” which groups the design recommendations to help the designer in the identification of the approaches to be considered in the context of a design for robustness and; - Part 2 (Sections 5 and 6) entitled “Tool box” which provides the designer with the required information to apply the different design approaches addressed in Part 1. In the next step of the FAILNOMORE project, the applicability of the proposed design approaches will be illustrated through the worked examples (Task 2-2). Then, the dissemination materials made of a design manual (including the design recommendations and the worked examples) and of PowerPoint presentations will be prepared (Task 2-3) taking into account of the outcomes from Tasks 2.1 and 2.2
The numerical recalculation performed on the slab, beam and joint tests as well as the analytical... more The numerical recalculation performed on the slab, beam and joint tests as well as the analytical recalculation of these tests have been employed as support for the experimental investigations represented within the previous chapter. In particular, numerical and analytical analysis have been performed to design the experimental test and the test setup for the symmetric and the asymmetric 3D test performed by UTRE. For the 2D-frame tests a numerical simulation was performed and the analytical model was validated. In addition to the recalculation of the experimental investigations on composite joints some parameters were varied in order to evaluate the influence on the behavior of the composite joints. Furthermore an analytical approach to predict the response of joints subjected to M-N-loading was investigated. In addition, analytical calculations have been performed in order to predict the results of the static and dynamic experimental tests
Guidelines for the collection & preparation of material and suggestions for manuscript,
Introductory notes. Composite connections - Finite element modelling of partially restrained beam... more Introductory notes. Composite connections - Finite element modelling of partially restrained beam-to-girder connections, C.O. Rex, W.S.Easterling, Prediction method for moment-rotation behaviour of composite beam to steel column connection, Ping Ren,M. Crisinel. Special connections - Connection between steel beams and concrete filled R.H.S. based on the stud technique (threaded stud), D. Vandegans, J. Janss, Seismic performance of CFT column-to-WF beam moment connections, J.M. Ricles et al, The static strength and behaviour of multiplanar I-beam to tubular column connections loaded with in-plane bending moments, G.D. de Winkel et al. Design methods - Strength of moment end-plate connections with multiple bolt rows at the beam tension flange, T.M. Murray, J.T. Borgsmiller, Estimates of ductility requirements for simple shear connections , W.A. Thornton, Mechanical modelling of semi-rigid joints for the analysis of framed steel and composite structures, F. Tschemmernegg, G. Queiroz. M...
International Journal for Computational Methods in Engineering Science and Mechanics, 2018
The disasters happened in recent past pointed out the need of design criteria, ensuring adequate ... more The disasters happened in recent past pointed out the need of design criteria, ensuring adequate safety levels against progressive collapse. The attention was focused on the behavior of composite beam-to-column joint components in the field of large displacements. This article presents the experimental and numerical study enabling the simulation of the RC elements under tension. This has helped in understanding the non-negligible contribution of concrete in tension stiffening response up to failure especially in the case of discontinuous geometry marked in composite structures. The finite element model proposed may be considered a midway between smeared and discrete crack modeling approaches.
Innovation in Engineering for Seismic Regions
This study is concerned with evaluating the response of single pile subjected to cyclic horizonta... more This study is concerned with evaluating the response of single pile subjected to cyclic horizontal uniaxial loading. Combination of lateral cyclic loading and constant vertical or lateral load in twoorthogonal directions is also studied. Moreover, the influence of one-and two-way loading, number of cycles and the intensity of constant load in conjunction with the cyclic lateral load is presented. The study is further continued by comparing the performance of long and short single pile embedded in clayey soil. A series of three-dimensional finite element models using ANSYS code are conducted to model three-dimensional transient analysis as well as the complicated soil pile interaction. In order to verify the validity numerical model, the numerical response is compared with reported results obtained by experimental cyclic load test performed on single pile penetrated in soft clay. Results show strong coupling between the two-orthogonal direction of lateral loading that decreases the lateral pile capacity. The interaction relation of biaxial loading with the factor b = 1.2 and 1.15 for one-and two-way loading respectively may well approximate the analysis results. The results of study are presented in terms of lateral cyclic capacities, pile head deflection, displacement profile and bending moment over the pile length.
IABSE Symposium, Budapest 2006: Responding to Tomorrow's Challenges in Structural Engineering, 2006
In view of recent disasters and their immense economical and human consequences such as the flood... more In view of recent disasters and their immense economical and human consequences such as the flood catastrophe in South East Asia or the constant threat by international terrorism more and more focus is given not only on the safety of structures-to reduce the risk for the life of people by collapse even under exceptional loading-but on minimising the disastrous results and to enable a quick rebuilding and reuse. One crucial mean to achieve this aim is the design of redundant robust structures. Robustness prevents the collapse of the total structure when only parts of the structure are damaged or destroyed. To avoid progressive failure, redundant structures with inherent sufficient ductile behaviour allowing deformations when a local failure occurs, have to be built. Redundancy can be achieved by allowing force redistribution within a structural system. Therefore the single sections and joints have to be especially designed and optimised, not necessarily requiring additional fabrication costs. Steel is a preferable building material for robust structures because of its ductile properties. But until now no specific rules for robustness by ductile joints exist. The aim of the present project is to define general requirements for ductile joints as part of a structural system subjected to exceptional unforseen loading.
Proceedings of the 10th Pacific Structural Steel Conference (PSSC 2013), 2013
Advances in Steel Structures (ICASS '99), 1999
Publisher Summary Beam-to-column joints remarkably influence the overall response of the frame an... more Publisher Summary Beam-to-column joints remarkably influence the overall response of the frame and, as a consequence, the possibility to take into account accurately their behavior is of great importance for structural design. This chapter presents some approaches to monitor the damage and to assess the failure of beam-to-column steel joints under seismic loading, via low-cycle fatigue approaches, which have been recently proposed and validated with reference to steel components (members and joints) under cyclic loading. The considered approaches are based on the selection of a suitable parameter (S) capable to represent the global joint behavior and require the experimental definition of S-N (number of cycles at collapse) fatigue resistance curves on the basis of cyclic loading histories, which have to be suitably selected. Design analysis of frames in seismic zones is allowed by means of two alternative methods: nonlinear dynamic analysis under real or synthetic accelerograms, and linear dynamic analysis to verify the safety of the structure based on its response to a design spectrum.
ABSTRACT The last years were characterized by a growing interest about the development of strateg... more ABSTRACT The last years were characterized by a growing interest about the development of strategies for the mitigation of the damages caused by accidental events. Accidental actions can be resisted by residual strength and alternate load path methods and combination of these strategies can lead to an effective and cost efficient design procedure for progressive collapse mitigation by redistributing the loads within the structure. One of the main objective of these strategies is the development of structural systems able to activate mechanisms to transfer the loads from the damaged to the undamaged part of the structure. This paper illustrates the preliminary work carried on within a European Research Project, aimed at developing new design concepts for steel-concrete composite frames against accidental actions. The first part of the study investigates the behavior of two geometrically different steel-concrete 3-D composite frames subjected to the loss of an internal column. Two full-scale experimental tests will be performed on a part of these structure. By simulating the total loss of the impacted column, the experiments enable investigation of the redundancy of the 3-D slab system in terms of activation of membrane effects. The present paper presents the preliminary study for the design of the tests.
ABSTRACT Pallet racks from the structural point of view, can be considered typical steel framed s... more ABSTRACT Pallet racks from the structural point of view, can be considered typical steel framed structures. Their design is usually performed adopting 2-D simplified models related to the main frame directions: i.e. down-aisle and cross-aisle direction. The frame stability in down-aisle direction, where usually bracing systems are missing, is ensured by the degree of continuity provided by joints (i.e. beam-to column and base-plate joints). The rack joints behaviour appears quite complex and the main Standards for pallet racks (i.e., AS, FEM, RAL, RMI) suggest specific tests to suitably characterise their performances. At the University of Trento, in the framework of a research work of pallet racks, a research on the response of base-plate joints under axial eccentric load (base-plate connection test) is currently in progress. In this paper the on-going activity is presented and the preliminary results are briefly discussed.