Methods of Feasible Directions. By G. Zoutendijk. Pp. 126. 30s. 1960. (D. van Nostrand Co. London)

Yield criteria for quasibrittle and frictional materials

Frictional contact problems with normal compliance

1 Introduction 2 Elements of tensor algebra and analysis 3 Solid mechanics at finite strains 4 Isotropic nonlinear hyperelasticity 5 Solutions of simple problems in finitely deformed nonlinear elastic solids 6 Constitutive equations and anisotropic elasticity 7 Yield functions with emphasis on pressure-sensitivity 8 Elastoplastic constitutive equations 9 Moving discontinuities and boundary value problems 10 Global conditions of uniqueness and stability 11 Local conditions for uniqueness and stability 12 Bifurcation of elastic solids deformed incrementally 13 Applications of local and global uniqueness and stability criteria to non-associative elastoplasticity 14 Wave propagation, stability and bifurcation 15 Post-critical behaviour and multiple shear band formation 16 A perturbative approach to material instability

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Nonlinear Solid Mechanics: Bifurcation Theory and Material Instability

A mathematical programming approach to three-dimensional contact problems with friction

. In December 2012 ENIservizi (the Italian multi-national energy agency operating in many countries), after the Earthquake that occurred in April 2009, decided to undertake the project ‘Re-start from Collemaggio’ with the aim of giving new hope to the L’Aquila community, funding around 14 million Euro to restore the Basilica di Collemaggio. The Superintendence Office carried on the restoration project with the scientific support of the Universita degli Studi de L’Aquila and the Universita La Sapienza di Roma, under the coordination of the Politecnico di Milano. ENIservizi, aware of the BIM potential in the complex building and infrastructure domain in the world, required an advanced HBIM from the laser scanner and photogrammetric surveying to support the diagnostic analysis, the design project, the tender and the restoration itself, today still on course. Plans and vertical sections were delivered (2012) starting from the surveying campaigns (February and June 2013), together with the first HBIM advancement from the end of 2012 in support of the preliminary-definitive-executive steps of the restoration design project (2013-14-15). Five years later, this paper tries to make a synthesis of the different lessons learnt, in addition to the positive and critical aspects relating HBIM feasibility, sustainability and usefulness to the challenging restoration work. In particular, the Collemaggio BIM experience anticipated the new Italian Public Procurement Legislation (D.Lgs 50/2016, Nuovo Codice degli Appalti pubblici) aligned with to the EUPPD 24/2014: the EU Directive on Public Procurement asked all the 28 EU countries to adopt building informative modelling by February 2016 in order to support the whole LCM (Life Cycle Management), starting from the project and the intervention, through rewarding scores or mandatory regulations. Many analyses foresees to save from around 5% to 15% of the overall investment by adopting mature BIM (Level 3 to 5), particularly 4D remotely controlled BIM in support of the LCM, as in the case of maintenance and management process. The tender for Basilica restoration was published in 2015: the process was not developed enough to introduce selective criteria based on BIM adoption by the Construction Industry due to the lack of legislation at that time and the lack of BIM skills among the companies. Nevertheless ENIservizi also separately funded aside the HBIM of the Basilica to tackle an advanced BIM able to address decision-making processes in the heritage domain among the different actors: to support operators, architects, structural engineers, economic computation, construction site management and restoration, the theoretical and practical approach adopted by the HBIM, overcame the current logic based on sequential LoD (from simplex to complex, from the preliminary to the executive design) that is typical of new constructions in favour of a complex LoD approach that could guarantee management of the richness, unicity and multiplicity of each component and the maximum degree of knowledge in order to derive the decisions from the starting phases of the project. On the lesson learnt from this experience, the process of updating the current codification criteria (UNI11337-2009) was started with a draft proposal stimulating a debate for the future of HBIM adoption.

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Hbim challenge among the paradigm of complexity, tools and preservation: the basilica di collemaggio 8 years after the earthquake (l’aquila)

Computer analysis of elastic-plastic structures

The Strength and Strain of High-strength Concrete Elements with Confinement and Steel Fiber Reinforcement Including the Conditions of the Effect of Elevated Temperatures☆

Alberto Franchi

Papers

Hbim challenge among the paradigm of complexity, tools and preservation: the basilica di collemaggio 8 years after the earthquake (l’aquila)

Computer analysis of elastic-plastic structures

The Strength and Strain of High-strength Concrete Elements with Confinement and Steel Fiber Reinforcement Including the Conditions of the Effect of Elevated Temperatures☆

A modified gradient method for finite element elastoplastic analysis by quadratic programming

Structural analysis of stone masonry columns of the Basilica S. Maria di Collemaggio