Pietro Crespi

Pietro Crespi
Politecnico di Milano | Polimi · Department of Architecture, Built Environment and Construction Engineering

About

73
Publications
17,427
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
317
Citations

Publications

Publications (73)
Article
Full-text available
Recent Italian earthquakes have shown the seismic vulnerability of many typical historical masonry churches characterized by one nave and wooden roofs. Under transverse earthquake, the nave transverse response of this kind of churches can be influenced by the geometrical and material features. To increase the seismic performance, strengthening inte...
Article
Recent collapse events of existing reinforced concrete bridges have increased the attention on the mandatory and suitable maintenance of these strategic constructions. In fact, most of these failures were due to an inadequate scheduling of maintenance interventions. One of the main issues concerning the load-bearing capacity of existing reinforced...
Article
In this paper, a non-standard finite element (FE) method, coupled with a mathematical programming procedure, is presented to simulate initiation and propagation of in-plane tensile cracks in quasi-brittle material. Potential crack lines are defined and limited by the FE edges. The cracks are considered as localized plastic deformations imposed at t...
Preprint
Full-text available
Recent Italian earthquakes have shown the seismic vulnerability of many typical historical masonry churches characterized by one nave and wooden roofs. Under transverse earthquake the nave transverse response of this kind of churches can be influenced by the geometrical and material features. To increase the seismic performance, strengthening inter...
Article
This paper compares the behavior of two T-shaped bolts in a cold-formed anchor channel system under tension loads, typically used to connect precast reinforced concrete elements. A new steel plate patented bolt is compared with a standard commercially available one. The comparison of the mechanical behavior of the two bolts is supported by experime...
Article
This paper deals with an experimental and numerical dynamic characterization of two steel wind turbines currently located in Italy. The considered steel turbines are onshore and were originally built more than 20 years ago with 65 m of height (from the ground level to the hub). Five years ago, they were unmounted and reassembled in the present loca...
Article
The repair of historical masonry columns damaged by earthquakes is a complex engineering procedure. In most cases, these elements support important vertical loads, and, for this reason, the repairing interventions (such as block replacement) could generate critical modifications of the stress pattern and eventually lead to local failures of the mas...
Conference Paper
Full-text available
Recently, the engineering interest about the durability of existing reinforced concrete structures has significantly increased as confirmed by the conspicuous scientific literature. The results of these studies are influencing the development of new structural codes. Among the wide range of existing reinforced concrete structures, motorway viaducts...
Article
Full-text available
Post-installed systems for the anchorage of safety barriers to bridge corbels are widely used today thanks to their flexibility and easiness of installation. Because of commonly found in situ boundary constraints, however, the design requirements for post-installed fasteners and rebars are frequently not satisfied or only partially satisfied. This...
Article
The structural safety and durability of existing reinforced concrete bridges can be considered as one of the current most important research topics in structural engineering, especially after the numerous collapses that have occurred in recent years. Considering the Italian context, it is important to highlight that most of these structures were bu...
Article
Full-text available
Over the last few decades, the attention on the safety of existing reinforced concrete (RC) structures has significantly increased. RC bridges, in particular, are highly relevant for strategic importance. In the Italian context, several of these bridges were built around 1960, when engineering practice commonly ignored or underestimated the presenc...
Article
Full-text available
In recent earthquakes, historical masonry churches have demonstrated to be vulnerable structures. Strengthening interventions based on the introduction of a roof diaphragm can be considered a valid solution in order to obtain a box-behaviour of this kind of structures. Among the possible different roof-diaphragm solutions, the wooden based ones rep...
Article
In the seismic retrofitting of historical churches, the realisation of new foundations of collapsed elements represents an important aspect for the interaction with both the underground pre-existing structures and the new structural elements to be rebuilt. For the specific case study of the Basilica di Collemaggio, after an accurate geometrical sur...
Article
Full-text available
Post-installed anchor systems are widely used in several applications both for retrofit and new constructions due to their flexibility and easiness of installation. For these reasons, their use is very common to connect safety barriers to concrete corbels. However, the design requirements for fastening (Eurocode 2—Part 4, ACI 318 or for post-instal...
Conference Paper
Full-text available
A new approach for simulation of fracture in quasi-brittle material is proposed. The structure is discretized using classical triangular finite elements (FE). Only mode I fracture is considered. Cracks are able to develop along the element edges while elements behave elastically. The inelastic deformations are localized at the element nodes, in whi...
Conference Paper
The evaluation of the seismic behaviour of underground structures represents one of the most actual seismic geotechnical and structural engineering research topics about the study of the complex phenomena of soil-structural interaction. In the last decades, different types of simplified and numerical approaches have been developed for the correct a...
Article
A new procedure for dealing with elastoplasticity during the time integration of multi degree of freedom (MDOF) structural problems in dynamics is developed and numerically implemented. It is shown here how the solution of MDOF elastic–plastic dynamics structural problems formulated in generalized variables, when piecewise linear yield functions ar...
Conference Paper
Full-text available
The evaluation of the seismic behavior of underground structures represents one of the most actual seismic geotechnical and structural engineering research topics about the study of the complex phenomena of soil-structure interaction. In the last decades, different types of simplified and numerical approaches have been developed for the evaluation...
Conference Paper
Full-text available
This paper presents the evaluation of the seismic vulnerability of Santa Maria Novella Basilica in Florence. Santa Maria Novella is one of the most important historical churches in Italy and, for this reason, different studies on the structural behavior of this monument were conducted during the last decades. Particularly, this work is focused on t...
Conference Paper
Full-text available
The last seismic events in Central Italy (L'Aquila 2009, Amatrice 2016) have demonstrated that the economic loss from physical damage strongly influence the community's recovery capability, especially when a relevant portion of the building stock is represented by unreinforced masonry (URM) constructions. As a matter of fact, URMs are recognized as...
Conference Paper
Full-text available
In the seismic restoration of historical masonry churches, a strategy based on the realization of a dissipative roof diaphragm could be useful in order to limit the out-of-plane lateral walls (rocking mechanisms) and especially to reduce the in-plane shear transferred from the roof to the transversally oriented frames (or head walls) of the church....
Conference Paper
The performance of masonry structures under seismic conditions is strongly influenced by cracking phenomena that have to be taken into account to obtain a reliable evaluation of mechanical resources. An innovative finite element procedure is presented to simulate initiation and propagation of in-plane tensile crack in masonry material. The material...
Conference Paper
Full-text available
In the seismic retrofitting of historic churches, the realization of new foundations of collapsed elements represents an important aspect either for the interaction with the underground pre-existing parts or with the new structural elements to be rebuilt. For the specific case study of the Basilica di Collemaggio, after an accurate geometrical surv...
Conference Paper
Full-text available
Seismic assessment and retrofit of unreinforced masonry (URM) structures is a relevant topic nowadays, especially in countries where the majority of the buildings were built before the introduction of seismic design codes. Recent earthquakes have demonstrated that the structural weakness of URMs is responsible of fatalities, injuries and large econ...
Conference Paper
The Basilica of Collemaggio in L’Aquila, built in the late of XIII century by the will of pope Celestine V, experienced several seismic events during its life that caused some damages to its masonry structures. Particularly, the April 6th, 2009 earthquake caused the failure of the transept area where the dome, the barrel vaults, the triumphal arch...
Conference Paper
Full-text available
In order to improve the nave transversal response of historical churches, a strategy basing on wooden roof strengthening aimed to obtain the global “box” building's behaviour should be pursued. For this strategy the wooden roof has to work as a dissipative diaphragm able to contain the out-of plane lateral walls mechanisms by allowing controlled ro...
Article
The unreinforced masonry (URM) is a complex and variegate construction material characterized by a prominent nonlinear response. For this reason, advanced numerical simulations are required to assess URM buildings, especially in case of severe loading conditions as earthquakes. However, given the theoretical and computational difficulties of detail...
Article
Full-text available
The paper presents the seismic vulnerability analysis of the military dry dock built in 1861 inside the Messina’s harbor. The study appears very important not only for the relevance of the dry dock itself, but also for its social, military and symbolic role. As a first step, the historical documentation about the dry dock delivered by the Military...
Conference Paper
Full-text available
Recently, the engineering interest about the durability of existing reinforced concrete structures has significantly in- creased as confirmed by the conspicuous scientific literature. The results of these studies are influencing the development of new structural codes. Among the wide range of existing reinforced concrete structures, motorway viaduc...
Article
The evolution of damage of a glass-concrete façade panel is presented and discussed. The phenomenon is strongly influenced by the mutual interaction between three materials (concrete, steel rebars and glass) having different mechanical and rheological properties. To assess the possible causes of the observed damages, detailed 3D finite element nume...
Article
The Basilica of Collemaggio in L’Aquila is one of the outstanding architectural heritage in Abruzzo Region. The church, built in the late XIII century, has experienced many earthquakes during its life, some of which caused damages to the masonry structures, requiring continuous interventions and renovations. The last strong earthquake (April 6th, 2...
Conference Paper
Full-text available
Nella presente memoria sono affrontati due significativi interventi antisismici interessanti due storiche costruzioni italiane. In particolare, il primo intervento riguarda la ricostruzione conservativa, con miglioramento sismico, della Basilica di Collemaggio a L'Aquila, in gran parte crollata a seguito del ben noto sisma del 2009; il secondo inte...
Article
The paper refers the use of Tuned Mass Dumper (TMD) in different constructions recently built in Italy to improve their serviceability structural performances. In two footbridges and a new tall building the dynamic behaviors are analyzed in the two conditions: without and with TMD. The structural analysis show the improvements in the Serviceability...
Book
The paper refers the use of Tuned Mass Dumper (TMD) in different constructions recently built in Italy to improve their serviceability structural performances. In two footbridges and a new tall building the dynamic behaviors are analyzed in the two conditions: without and with TMD. The structural analysis show the improvements in the Serviceability...
Article
Full-text available
The article introduces the results of the experimental research of the effect of confinement and steel fiber reinforcement on the strength and strain of the compressed elements of high-modified as well as high-strength SFRC. Analytical expressions to describe the strength and strain of elements with confinement reinforcement under axial compression...
Conference Paper
Full-text available
The construction design process is starting to change with the advent of Building Information Modelling technology. Thanks to the high level of BIM interoperability, it has been possible to transform a BIM model of an historical building, obtained from a laser scanner survey, into an accurate 3D Finite Element Model. The model is able to exploit al...
Conference Paper
Full-text available
The paper summarizes some of the studies carried out on the stone masonry structures of the building "palazzo Paone" to assess the damages caused by the earthquake of April 6 th 2009, in the historical center of L'Aquila and to suggest rehabilitation materials and techniques. The extended report about the work done is available on [1]. After a brie...
Conference Paper
Full-text available
The paper concerns with the seismic assessment of the Basilica of Collemaggio after the earthquake that struck the city of L’Aquila in April 6th, 2009. The earthquake caused the collapse of part of the transept structures and some damages in columns of the church naves and in the apses area. The historical investigation has pointed out that the chu...
Book
Full-text available
The paper summarizes the studies conducted on the military dry dock in the Port of Messina (built in 1861), to assess the seismic vulnerability. For this work was conducted an accurate research on the historical sources of Technical Office of the Italian Civil Engineers, to know the construction methods, the operations made after the earthquake of...
Article
In recent years, Italian technical-scientific community has increased its interest on the evaluation of the seismic response of existing structures. Among this wide range of structures, reinforced concrete bridges stand out for their strategic relevance and technical complexity. Most of these structures were built between 60ies and 70ies, according...
Article
In this paper the use of fly ash for particular High Strength Concrete (HSC) realizations is investigated. The use of fly ash as a partial replacement of Portland cement in HSC seems a valid solution in particular for a sustainable construction design, considering the interesting HSC performances (in terms of strength and durability) and the econom...
Conference Paper
Full-text available
In recent years, Italian technical-scientific community has increased its interest on the evaluation of the seismic vulnerability of existing structures. Among this wide range of structures, motorway viaducts stand out for their strategic relevance and technical complexity. Most of these structures were built between '60 and '70 years, according to...
Conference Paper
Full-text available
In this paper the use of fly ash for particular High Strength Concrete (HSC) realizations is investigated. The use of fly ash as a partial replacement of Portland cement in HSC seems a valid solution in particular for a sustainable construction design, considering the interesting HSC performances and the economic aspects. Obviously the advantages d...
Conference Paper
SOMMARIO Negli ultimi anni la comunità tecnico-scientifica ha rivolto un interesse crescente nei confronti delle tematiche inerenti alla valutazione della vulnerabilità sismica delle costruzioni esistenti. In quest'ampio panorama spiccano, per importanza strategica e complessità tecnica, i viadotti della rete autostradale. La maggior parte di quest...
Conference Paper
Full-text available
SOMMARIO Negli ultimi anni la comunità tecnico-scientifica ha rivolto un interesse crescente nei confronti delle tematiche inerenti alla valutazione della vulnerabilità sismica delle costruzioni esistenti. In quest'ampio panorama spiccano, per importanza strategica e complessità tecnica, i viadotti della rete autostradale. La maggior parte di quest...
Conference Paper
Full-text available
SOMMARIO Le norme vigenti in materia di prestazioni (identificazione e qualificazione) ed accettazione dei materiali da costruzione sono un tema di particolare interesse per i professionisti che al giorno d'oggi nelle diverse vesti di Progettisti, Direttori dei lavori o Collaudatori, si trovano a dover gestire il cantiere per la costruzione di una...
Article
The paper illustrates the experimental techniques and the experimental results obtained at the Wall of Wind WoW of Florida International University (FIU), in Miami, concerning some tests on trees under wind loading. The motivation of the scientific work comes from unresolved questions that the designers of high rise buildings in Milano had to deal...
Article
Present paper presents the technical specifications of an experimental equipment able to perform an in situ diagonal compression test on a masonry specimen with displacement control. It is, therefore, capable to evaluate ductility behaviour also after the peak load. In addition, the equipment is capable to evaluate the different mechanical behaviou...
Article
The paper is focusing the attention on the important aspects related not only to the acceptable safety level avoiding catastrophic failures and loss of life, but even tohigher performance level requested for some important buildings,like hospital,police station, communication centers. Such buildings need to be designed to remain functional after th...
Conference Paper
Full-text available
The paper presents the results of numerical investigations, based on a set of experimental tests, for the analysis of seismic vulnerability of a dry dock plant in Messina, property of the Italian Navy. The Messina dry dock, one of the oldest in Europe, was built around the mid of 1800 and it experienced the devastating earthquake of 1908. The aims...
Conference Paper
Full-text available
The paper illustrates a set of experimental-numerical investigations with the aim of explaining the cause of progressive crack opening in an industrial plant which was built at the beginning of 1900. The plant was built at the end of a drainage canal at Sermide, Province of Mantova -Italy. The two buildings, which constitute the plant, have both, a...
Article
With the sustainability movement, vegetated building envelopes are gaining more popularity. This requires special wind effect investigations, both from sustainability and resiliency perspectives. The current paper focuses on wind load estimation on small- and full-scale trees used as part of green roofs and balconies. Small-scale wind load assessme...
Conference Paper
Full-text available
In this paper an innovative spherical tall building is presented in its structural and energetic aspects. Particularly, the building structure (with a resisting frame made of meridians and parallels beams) and its behavior under static and dynamic loads in two different configurations, having different geometry at the lower levels, are analyzed. At...
Chapter
An outline of authors’ ongoing research activity and research proposals on timber structures is presented in this paper. Reference is made also to the cooperation between the Department of Structural Engineering of the Politecnico di Milano and the Department of Civil and Natural Resources Engineering of the University of Canterbury (Christchurch,...
Article
Sineco develops maintenance programs on bridge structures as an integrated method based on the historical inspection results database and the bridge management system tools provided by the software Pontis. It is generally possible to create probabilistic deterioration models very customized and reliable for different bridge networks using the amoun...
Article
This paper presents a novel methodology for the nondestructive evaluation of brick walls using fuzzy logic and summarizes the results of the nondestructive evaluation of the relative condition of a sidewall of a brick masonry channel using the multichannel analysis of surface waves (MASW) test. The new methodology addresses the critical problem of...
Conference Paper
Full-text available
Gli alti edifici (torri) oggetto della presente memoria sono la torre progettata dall’architetto Cesar Pelli per “Porta Nuova” (Milano) e la torre progettata dall’architetto Arata Isozaki per “CityLife (Milano). Per entrambe le torri si sono stimate le sollecitazioni di progetto (in termini di: accelerazioni aSd, spostamenti SSd ed effetti delle az...
Chapter
Centering on worldwidly present urban areas, there have been many high-rise landmark buildings constructed in recent years. It is recognized that reinforced concrete has merit over steel frame construction in high-rise buildings, such as less sway in high winds, better human life protection in case of accidental heavy damage, better noise resistanc...
Chapter
This paper is meant to present themechanical characteristics of austenitic stainless steel rebars under monotonic and cyclic loadings. Furthermore, some results concerning the experimental tests on column prototypes subjected to cyclic loadings are presented, with the intent of comparing with results obtained on analogous columns reinforced with st...
Article
This paper is meant to deliver an overview on the damages and the following repairs of the structures of the 26th and 27th floor due to the plane accident occurred on April, the 18th 2002.An aircraft Commander 112 TC Commander impacted the facade of the Pirelli skyscraper getting into the building, where its gasoline tanks exploded.This paper is di...