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Constitutive modeling of hysteresis in nitinol and steel strands through data-driven strategies 8

Constitutive modeling of hysteresis in nitinol and steel str...

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8th ECCOMAS thematic conference on Smart Structures and Materials, SMART 2017 and 6th International conference on Smart Materials and Nanotechnology in engineering, SMN 2017

作者： Brewick, Patrick Masri, Sami F. Lacarbonara, Walter Carboni, Biagio Astani Department of Civil and Environmental Engineering University of Southern California Los AngelesCA United States Department of Structural and Geotechnical Engineering Sapienza University of Rome Rome Italy

ISBN: (纸本)9788494690938

Data-driven strategies for nonlinear identification are applied to experimental data exhibiting various types of hysteretic behavior. the experimental data contain displacement and restoring force information for several tests conducted using different configurations of a unique rheological testing device with various assemblies of NiTiNOL and steel wire strands. Among the different configurations the response of the wire strands show distinct forms of nonlinear behavior, such as quasi-linear softening, pinching, and hardening. the data-driven methods applied for nonlinear identification include polynomial basis functions and neural networks. the polynomial basis nonlinear identification methods are used for the construction and characterization of reduced-order models in order to gain insight into the physical modeling of the hysteretic phenomena. the neural network methods are found to be more useful for predictive purposes, demonstrating an ability to produce accurate results on both training and testing data. © 2017 International Center for numerical methods in engineering. All rights reserved.

关键词： Hysteresis

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Accuracy of equivalent linear models for bilinear oscillators under pulse-like ground motion 6

Accuracy of equivalent linear models for bilinear oscillator...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Quaranta, Giuseppe Mollaioli, Fabrizio Department of Structural and Geotechnical Engineering Sapienza University of Rome via Eudossiana 18 Rome00184 Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome via Gramsci 53 Rome00197 Italy

ISBN: (纸本)9786188284418

Nonlinear dynamic analysis is the most reliable approach for the assessment of structures under earthquake, provided that implemented computational method and adopted mechanical models are able to simulate properly material and geometrical nonlinearities. Nonetheless, several guidelines and codes also strive to include simplified methodologies for use in practice. In this perspective, several equivalent linear models have been proposed so far in order to allow a rapid analysis of oscillators with bilinear-type response, but none of the existing studies has yet examined systematically their reliability in case of pulse-like ground motion. therefore, this paper presents the results of an extensive numerical investigation that aims at assessing whether existing equivalent linear models can be exploited in order to estimate the maximum displacement of bilinear oscillators under pulse-like near-fault ground motion. Several nonlinear dynamic analyses have been performed and final results demonstrate that the accuracy of current equivalent linear models depends on the ratio between the elastic period of the bilinear oscillator and the pulse period of the seismic excitation.

关键词： Reliability analysis

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Finding correlations between engineering demand parameters and intensity measures through evolutionary polynomial regression 6

Finding correlations between engineering demand parameters a...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Fiore, Alessandra Mollaioli, Fabrizio Quaranta, Giuseppe Marano, Giuseppe C. Department of Science of Civil Engineering and Architecture Technical University of Bari Via Orabona 4 Bari70125 Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome Via Gramsci 53 Rome00197 Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome Via Eudossiana 18 Rome00184 Italy College of Civil Engineering Fuzhou University Xue Yuan Road Fuzhou350108 China

ISBN: (纸本)9786188284418

A critical issue in performance-based seismic assessment of structures and infrastructures is the development of reliable formulations able to correlate engineering demand parameters (EDPs) with given earthquake intensity measures (IMs). this task involves the following steps: i) selection of target cases-study and elaboration of the corresponding structural models, ii) preparation of the database collecting seismic records, iii) identification of candidate EDPs and IMs, iv) nonlinear dynamic analyses, v) numerical calibration of functional models able to correlate EDPs and IMs, vi) evaluation of the predictive capability of the developed models. Within this framework, the present paper exploits an advanced nonlinear regression method - named Evolutionary Polynomial Regression technique - in order to obtain several non-dominated models (according to the Pareto's dominance criterion) that predict EDPs as function of assigned IMs for fixed-base and base-isolated multi-storey reinforced concrete buildings subjected to ordinary and pulse-like ground motion.

关键词： Polynomials

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Computational and experimental analysis of surface acoustic wave propagation on piezoelectric gaas layer 8

Computational and experimental analysis of surface acoustic ...

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8th ECCOMAS thematic conference on Smart Structures and Materials, SMART 2017 and 6th International conference on Smart Materials and Nanotechnology in engineering, SMN 2017

作者： Maruccio, Claudio Scigliuzzo, Marco Rizzato, Silvia Quaranta, Giuseppe Maruccio, Giuseppe Department of Innovation Engineering University of Salento Via Monteroni Lecce Italy Department of Mathematics and Physics E. de Giorgi University of Salento via Monteroni Lecce Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome via Eudossiana 18 Rome Italy

ISBN: (纸本)9788494690938

A computational study of the electromechanical response of nano-structure engineered two port surface acoustic wave (SAW) delay lines on GaAs is presented. the influence on the results of geometrical, material and mesh parameters is also discussed. Furthermore, preliminary experimental results are provided to validate the numerical study. the device consists in two interdigital transducers (IDTs) composed of 80 couples of electrodes, with a pitch pidt=8μm and distant didt=1502μm. Fully coupled multiphysics finite element (FE) analyses are developed to capture the SAWs propagation on GaAs along the [110] crystallography direction. In particular, a microwave burst of SAWs propagating on GaAs is fully characterized including multiple transit effects. these results are of major interest for understanding the dynamical behavior of complex systems such as SAW based sensors or energy harvesting devices at the nano and microscale. © 2017 International Center for numerical methods in engineering. All rights reserved.

关键词： Gallium arsenide

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geotechnical seismic isolation using EPS geofoam around piles 6

Geotechnical seismic isolation using EPS geofoam around pile...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Karatzia, Xenia A. Mylonakis, George E. University of Patras Dept. of Civil Engineering Rio26500 Greece University of Bristol Dept. of Civil Engineering Queens Building BristolBS8 1TR United Kingdom

ISBN: (纸本)9786188284418

the feasibility of a new geotechnical seismic isolation system for pile-supported structures, such as bridge piers on monopiles, is investigated. the isolation system utilizes a soft annular zone of viscoelastic material, such as EPS geofoam, around the upper part of the pile. the presence of the EPS elongates the fundamental natural period of the structure and also modifies its damping. For simplicity and as a proof of concept, the superstructure is considered a simple oscillator. Based on a dynamic Winkler model for pile-soil interaction, the problem is treated analytically leading to a simple design-oriented analysis method. Closed-form solutions are obtained for: (a) the lateral stiffness of the structure-foundation system, (b) the corresponding fundamental period, and (c) the overall damping. numerical analyses in the frequency domain by means of the computer code SPIAB verify the above analytical predictions. Analyses in the time domain are also carried out to examine the effect of geofoam on the dynamic response. Results in terms of base shear, maximum pile bending moment, and displacement at deck level are presented in dimensionless form, allowing for quantification of the effect of geofoam on seismic performance. It is shown that the presence of geofoam around the pile can reduce the seismic demand, rendering the proposed method a promising, inexpensive alternative to structural protective systems.

关键词： Piles

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Dynamic control of deformable mirrors for adaptive optics 8

Dynamic control of deformable mirrors for adaptive optics

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8th ECCOMAS thematic conference on Smart Structures and Materials, SMART 2017 and 6th International conference on Smart Materials and Nanotechnology in engineering, SMN 2017

作者： Wang, Kainan Alaluf, David Mokrani, Bilal Preumont, André Avenue F.D. Roosevelt 50 Brussels1050 Belgium European Space Agency -ESA/ESTEC Opto-Electronics Section Keplerlaan 1 Noordwijk ZH2201 AZ Netherlands

ISBN: (纸本)9788494690938

this paper discusses the shape control of deformable mirrors in the dynamic range. the phenomenon of control-structure interaction which appears when the control bandwidth increases is described and the main parameters affecting it are highlighted. Finally, passive and active strategies for damping augmentation are proposed and tested in simulation. © 2018 International Center for numerical methods in engineering. All rights reserved.

关键词： Adaptive optics

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Detailed simulation of the shaft ingate of a shield tunnel under seismic impact 6

Detailed simulation of the shaft ingate of a shield tunnel u...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Zhang, Jinghua Meng, Qingqiang Tu, Xinbin Zhao, Jian Xiao, Mingqing Yuan, Yong Department of Geotechnical Engineering Tongji University No. 1239 Siping Rd. Shanghai China Dept. of AC Transmission Project State Grid Corporation of China No. 86 Chang'an Avenue Beijing China Technology Center China Railway Siyuan Survey and Design Group Co. LTD. No. 745 Heping Avenue Wuhan City China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University No. 1239 Siping Rd. Shanghai China

ISBN: (纸本)9786188284418

Under seismic impact, critical joints, such as connecting passages and working shafts, are the weak points in shield tunnels. Due to the sharp structural change, stress concentration in these parts is more severe than that in the regular tunnels. In order to have a better understanding of the seismic behavior of the working shaft ingate in shield tunnels, a three-dimensional finite element model is constructed based on a utility tunnel built in the north of Suzhou City beneath the Yangtze River. the numerical model is composed of three major parts, namely, the working shaft, the shield tunnel and the surrounding soil. For the sake of a realistic simulation, many details are considered in this model, including tunnel segments, bolts, layered soil, etc. the deformation and the displacement near the ingate are investigated along with the internal forces of the bolts. this numerical study is part of a research project which is aimed at analyzing the seismic performance of the very same utility tunnel in Suzhou. Meanwhile, a shaking table test is due. And many valuable predictions are drawn through the numerical analysis.

关键词： Seismology

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Experimental and numerical study of wave dynamics in tensegrity columns 6

Experimental and numerical study of wave dynamics in tensegr...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Amendola, Ada Fabbrocino, Francesco Favata, Antonino Micheletti, Andrea Fraternali, Fernando Daraio, Chiara 84084 Italy Pegaso University Department of Engineering Naples80132 Italy Department of Structural and Geotechnical Engineering Sapienza University of Rome Rome00197 Italy Department of Civil Engineering and Computer Science Engineering University of Rome Tor Vergata Rome00133 Italy Engineering and Applied Science California Institute of Technology PasadenaCA91125 United States

ISBN: (纸本)9786188284425

this work deals with the experimental testing and the numerical simulation of the impulsive dynamics of a tensegrity lattice. the analyzed system is a column made of ten regular tensegrity prisms, each composed of two solid triangular plates (bases), three cross bars, and three cross cables. Bars and bases are additively manufactured in a titanium alloy, through electron-beam melting, while cross cables are made of Spectra fibers and are added to the titanium structure afterward 3D-printing process. the experimental response of the examined tensegrity column under impact loading is studied by recording the waves traveling through the system by means of a Digital Image Correlation algorithm, which measures the axial displacements of the bases of each unit. We compare the experimental results with those obtained from numerical simulations performed by adopting two different nonlinear elastic models: one accounting for the presence of bending-stiff connections between the 3D-printed elements, and for the resulting mixed bending-stretching regime;the other one being a tensegrity model which describes a purely stretching response of the column. Such a comparison shows that the presence of bending-stiff connections may weaken the nonlinearity of the wave dynamics that is typical of tensegrity lattices with frictionless nodal connections. We also observe that a marked nonlinear behavior occurs in the case of pure-tensegrity response (no bending deformation) under small prestress. © 2017 ECCOMAS Proceedia. All Rights Reserved.

关键词： Dynamics

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Taking into account the uncertainty in the tmd design for the vibration serviceability of a footbridge 8

Taking into account the uncertainty in the tmd design for th...

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8th ECCOMAS thematic conference on Smart Structures and Materials, SMART 2017 and 6th International conference on Smart Materials and Nanotechnology in engineering, SMN 2017

作者： Jiménez-Alonso, J.F. Sáez, A. Department of Building Structures and Geotechnical Engineering Universidad de Sevilla Avenida de Reina Mercedes 2 E-Seville41012 Spain Department of Continuum Mechanics and Structural Analysis Universidad de Sevilla Camino de Los Descubrimientos s/n E-Seville41092 Spain

ISBN: (纸本)9788494690938

Tuned mass dampers (TMDs) are control devices widely used to reduce the pedestrian induced vibrations on footbridges. the TMD parameters are designed according to the requirements demanded for the structure. One of the main factors to be overcome for the TMD design is the change of the modal parameters of the structure associated with the modification of its operational and environmental conditions. the main purpose of this study is to analyze the effect of this uncertainty in the TMD design for the vibration serviceability of footbridges. the sensitivity of three well-known constraints under these uncertainty conditions is analyzed. the variability of the modal parameters is simulated by a probabilistic approach based on previous results reported in literature. A robust method is implemented in order to ensure an adequate behavior of the structure under these stochastic conditions. As an example, a benchmark footbridge is considered to assess numerically the performance and accuracy of the different methods. the pedestrian action is simulated according to the recommendations of the Synpex guidelines. the results show which the most adequate constraint is (among the three studied cases) to control the pedestrian induced vibrations on footbridge under stochastic conditions. © 2017 International Center for numerical methods in engineering. All rights reserved.

关键词： Genetic algorithms

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Validation of refined numerical modeling for existing rc buildings: Comparison between predicted and observed earthquake damage 6

Validation of refined numerical modeling for existing rc bui...

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6th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Del Vecchio, C. Di Ludovico, M. Pampanin, S. Prota, A. University of Napoli 'Federico II' Department of Structures for Engineering and Architecture via Claudio 21 Napoli80125 Italy University of Rome 'La Sapienza' Department of Structural and Geotechnical Engineering Via Eudossiana 18 Roma00184 Italy University of Canterbury Department of Civil and Natural Resources Engineering Christchurch New Zealand

ISBN: (纸本)9786188284425

A reliable estimation of the seismic performances of existing reinforced concrete building is of paramount importance to design proper retrofit solutions. Number of refined numerical models are nowadays available, nevertheless predicting the seismic performance and the earthquake damage at component level is still a challenging task. Marked nonlinear phenomena, strength and stiffness degradation and pinching affect the cyclic behavior of structural members designed with reinforcement details non-conforming with current seismic codes. this, along with the interaction between the bare frame and the stiff infills, makes complex the reproduction of the global structural behavior. this study focuses on a refined modeling procedure properly developed for existing RC frames. the modeling assumptions, the hysteresis assigned to the different building components and the modeling strategy accounting for the infill contribution are presented and discussed. the model validation at component and building level related to case-study buildings damaged by the L'Aquila (2009) earthquake is presented. A component-by-component comparison between predicted and observed damage is shown. the proposed numerical model and the in-depth discussion on the earthquake damage are useful to identify the building weaknesses, estimate the repair costs and design proper retrofit solutions. © 2017 ECCOMAS Proceedia. All Rights Reserved.

关键词： numerical models

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