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If I have been able to see further, it was only because I stood on the shoulders of giants, Sir Isaac Newton............. If we knew what it was we were doing, it would not be called research, would it? Albert Einstein............A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible, Freeman Dyson............The joy of engineering is to find a straight line on a double logarithmic diagram, Thomas Koenig.............A great bridge is a great monument which should serve to make known the splendour and genius of a nation; one should not occupy oneself with efforts to perfect it architecturally, for taste is always susceptible to change, but to conserve always in its form and decoration the character of solidity which is proper. Jean Peronnet..............A theory may be so rich in descriptive possibilities that it can be made to fit any data. Phillip Johnson-Laird.............We shape our buildings, thereafter they shape us. Winston Churchill................
News > Presentation of Dr. Cusatis at The University of Tokyo


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Presentation of Dr. Cusatis at The University of Tokyo
 

 

Aging and deterioration of concrete structures. Learning from the past, assessing the present, and predicting the future

Abstract

In this presentation a novel computational framework for the simulation of aging and deterioration of concrete structures will be discussed. The overall framework is centered on the so-called Lattice Discrete Particle Model (LDPM). LDPM is a discrete mesoscale model of concrete that can accurately describe the macroscopic behavior of concrete during elastic, fracturing, softening, and hardening regimes. LDPM has been calibrated and validated extensively through the analysis of a large variety of experimental tests. LDPM can reproduce with great accuracy the response of concrete under uniaxial and multiaxial stress states in both compression and tension and under both quasi-static and dynamic loading conditions. The LDPM technology has been proven to supersede by far most of other available computational techniques for the simulation of concrete, especially for applications where the description of material internal structure and the link among different length scales is important.

The LDPM formulation is obtained by modeling the interaction among coarse meso-scale aggregate pieces as the interaction among polyhedral cells (each containing one aggregate particle) whose external surfaces are defined by sets of triangular facets. At each facet strain and stress, vectors are used to formulate the constitutive law describing physical mechanisms such as tensile fracture, cohesion, friction, etc. In a similar discrete fashion, the effect of fiber reinforcement can also be taken into account.

The presentation will give an overview of recent successes of the LDPM technology and the development of multiscale/multiphysics frameworks that use LDPM as the main fundamental component. The use of these novel approaches is demonstrated in relation to a variety of applications spanning several different themes relevant to infrastructure aging and deterioration.

 

Speaker Biosketch

I am a faculty member of the Civil and Environmental Engineering Department at Northwestern University that I joined in August 2011. Prior to joining Northwestern, I worked at Rensselaer Polytechnic Institute for 6 years. I obtained my ``Laurea''\footnote{ In the old Italian high educational system the ``Laurea'' degree was a five year degree equivalent to BS+MS degree} degree and my PhD in structural engineering from Politecnico Di Milano (Italy). I teach undergraduate and graduate courses of the civil engineering curriculum and perform research in the field of experimental, computational and applied mechanics, with emphasis on heterogeneous and quasi-brittle infrastructure materials. My work on constitutive modeling of concrete through the adoption of the so-called Lattice Discrete Particle Model (LDPM), one of the most accurate and reliable approaches to simulate failure of materials experiencing strain-softening, is known worldwide. In addition, recent work on waterless concrete for Martian constructions has received widespread attention in the technical community and in the media. Within the center for the Sustainable Engineering of Geological and Infrastructure Materials (SEGIM) __ for which I serve as co-director __ and under the sponsorship of several agencies __ including NSF, ERDC, and NRC __ my current research focuses on formulating and validating multiscale and multiphysics computational frameworks for the simulation of large scale problems dealing with a variety of different applications including, but not limited to, infrastructure aging and deterioration, structural resiliency, projectile penetration, and design of blast resistance structures.  I am member of FraMCoS, ASCE, and ACI and active in several technical committees. I serve as the chair of the ACI 209 committee on creep and shrinkage and I served as chair of ACI 446 on fracture mechanics. In these two committees I have been leading an effort to develop practical guidelines for the calibration and validation of concrete models. I serve as treasurer for IA-FraMCoS, president for IA-ConCreep, and I am a member of the EMI Board of Governors. Finally, I was recently awarded the prestigious EMI Fellow membership grade.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
30/07/2018   10:00   13869   30    NEWS
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