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Online since: October 2010
Authors: A. D’Ambrisi, V. Mariani, M. Mezzi
Seismic Assessment of a Historical Tower with Advanced Numerical
Model Tuned on Ambient Vibration Data
D'AMBRISI A1, a, MARIANI V
1,b and MEZZI M
2,c
1
Università di Firenze, Firenze, Italy
2
Università di Perugia, Perugia, Italy
a
adam@dicos.unifi.it, bvalmariani2@yahoo.it, cm.mezzi@unipg.it
Abstract This paper deals with the dynamic characterization and the evaluation of the seismic
response of the medieval civic tower of Soncino (Cremona, Italy).
Ambient Vibration Data Historical constructions can not be tested with destructive methods; for this kind of structures the dynamic identification by ambient vibration data is the most appropriate test.
In particular, the stress level has been defined at the most critical sections of the tower: at the base, at the height of 12 m where the constrain effects of the surrounding constructions are negligible, and at the height of 19.1 m in correspondence of the first reduction of thickness of the walls.
In the examined case the dynamic identification tuned on ambient vibration data gave important information about the material properties and the boundary constraints.
Alberto Marcellini for the support and cooperation in the data collection.
Ambient Vibration Data Historical constructions can not be tested with destructive methods; for this kind of structures the dynamic identification by ambient vibration data is the most appropriate test.
In particular, the stress level has been defined at the most critical sections of the tower: at the base, at the height of 12 m where the constrain effects of the surrounding constructions are negligible, and at the height of 19.1 m in correspondence of the first reduction of thickness of the walls.
In the examined case the dynamic identification tuned on ambient vibration data gave important information about the material properties and the boundary constraints.
Alberto Marcellini for the support and cooperation in the data collection.
Online since: July 2023
Authors: Elizaldo Domingues dos Santos, Liércio André Isoldi, Luiz Alberto Oliveira Rocha, Giovanni Antonio Vielma Vivas, Michel Kepes Rodrigues, Ruth da Silva Brum
The earth-air heat exchanger (EAHE) is a sustainable option that allows the electrical energy
consumption reduction in buildings.
Qualitatively, an adequate agreement between the numerical results obtained in the present study and the experimental data from [13, 22], with a similar thermal behavior tendency, can be seen in Fig. 4(a).
However, the experimental data are slightly underestimated by the obtained numerical results.
It should be noted that, as in [14], in the present study the variations in inlet air temperature correspond to data monitored in loco by [13, 22], while in [24] these variations were modeled by periodic functions obtained from these experimental data.
Santos, Thermal performance simulations of Earth-Air Heat Exchangers for different soils of a coastal city using in-situ data, Sustain.
Qualitatively, an adequate agreement between the numerical results obtained in the present study and the experimental data from [13, 22], with a similar thermal behavior tendency, can be seen in Fig. 4(a).
However, the experimental data are slightly underestimated by the obtained numerical results.
It should be noted that, as in [14], in the present study the variations in inlet air temperature correspond to data monitored in loco by [13, 22], while in [24] these variations were modeled by periodic functions obtained from these experimental data.
Santos, Thermal performance simulations of Earth-Air Heat Exchangers for different soils of a coastal city using in-situ data, Sustain.
Online since: September 2012
Authors: Feng Zhang, Yan Feng Wu, Wei Wei Wang, Xing Yuan Lin
Current codes[2] regulations vertical prestressing vertical normal stress formula superior to the 0.6 reduction factor in the regulations on the basis of earlier versions of the bridge.
However, from the field research can be found that at present there are many vertical prestressing Finishing Rolling Rebars less than 0.6 times the reduction factor.
A) Sensor arrangement B) Data acquisition system C) Test of vertical prestressing steel exsertion segment length Fig.3, The photo of vertical prestressing reinforcement tension test In the design drawings , the tension of JL32 :619.2KN,according to, vertical prestress multiplied by 0.6 times safety coefficient, and the tension will need at least 37.152 tons, so 43% can not reach the standard requirement.
Fig.4, The test tension values of vertical prestressed reinforced Though field detection process, there are several major reasons about finishing rolling rebar box-girder webs vertical prestress tension not in place: (1) Manual errors, in addition to the on-site construction in this dissertation the detection method for testing, while also using high-precision displacement meter vertical prestressing finishing rolling rebar elongation, detected through on-site manual, it's quite prevalence that nut is not tightened, resulting in vertical prestress pull reduction.
From the results of literature[4] we can see, if the installation of the anchor plate exist great error, then the angle between the nut and the anchor plate will cause the vertical prestressed reduction. 4 The Conclusion (1) In this paper we derives the vibration characteristic analysis of the exsertion segment of finishing rolling rebar
However, from the field research can be found that at present there are many vertical prestressing Finishing Rolling Rebars less than 0.6 times the reduction factor.
A) Sensor arrangement B) Data acquisition system C) Test of vertical prestressing steel exsertion segment length Fig.3, The photo of vertical prestressing reinforcement tension test In the design drawings , the tension of JL32 :619.2KN,according to
Fig.4, The test tension values of vertical prestressed reinforced Though field detection process, there are several major reasons about finishing rolling rebar box-girder webs vertical prestress tension not in place: (1) Manual errors, in addition to the on-site construction in this dissertation the detection method for testing, while also using high-precision displacement meter vertical prestressing finishing rolling rebar elongation, detected through on-site manual, it's quite prevalence that nut is not tightened, resulting in vertical prestress pull reduction.
From the results of literature[4] we can see, if the installation of the anchor plate exist great error, then the angle between the nut and the anchor plate will cause the vertical prestressed reduction. 4 The Conclusion (1) In this paper we derives the vibration characteristic analysis of the exsertion segment of finishing rolling rebar
Online since: October 2014
Authors: Pavel Reiterman, Vít Bäumelt
Reduction of water transport rate is often ensured by insulation or application of modifying additives and admixtures.
Mixture Ref-0 A-0.5 B-1.0 Capillary absorbability 1. day [g/mm2] 0.0049 0.0025 0.0009 Capillary absorbability 7. day [g/mm2] 0.0091 0.0046 0.0016 Conclusions Realized experimental program offers interesting data of capillary sorption measurement.
Reduction of water transport was just about 50 % for the 0.5% dose of admixture and more than 80 % with the 1% dose of admixture, related to reference mixture.
Reduction of water transport in building materials could improve number of utility properties and increase comfortableness of inner conditions for human life.
Next to extension of lifetime of building materials could improve visual impression of used materials because of reduction of efflorescences which are closely related to water transport.
Mixture Ref-0 A-0.5 B-1.0 Capillary absorbability 1. day [g/mm2] 0.0049 0.0025 0.0009 Capillary absorbability 7. day [g/mm2] 0.0091 0.0046 0.0016 Conclusions Realized experimental program offers interesting data of capillary sorption measurement.
Reduction of water transport was just about 50 % for the 0.5% dose of admixture and more than 80 % with the 1% dose of admixture, related to reference mixture.
Reduction of water transport in building materials could improve number of utility properties and increase comfortableness of inner conditions for human life.
Next to extension of lifetime of building materials could improve visual impression of used materials because of reduction of efflorescences which are closely related to water transport.
Online since: June 2014
Authors: Xu Chun Song, Rong Ma, Yi Qi Sun, Xia Cui
The obtained Co-doped Fe3O4 nanoparticles show good electrocatalytic activity for the H2O2 reduction, and has been applied to detect H2O2.
It can be seen that all the main peaks can be indexed undisputedly as the pure Fe3O4 of spinel structure (space group: Fd-3m), which was in good agreement with the standard data (JCPDS card 19-0629).
The Co-doped Fe3O4 nanoparticles exhibits reduction of H2O2 starting around -0.3 V in 0.01M phosphate buffer (pH 7.0) containing 7 mM H2O2 (curve b), which may be applied as the quantitative analysis.
Seong, Electrocatalytic reduction of hydrogen peroxide by silver particles patterned on single-walled carbon nanotubes, Sensor.
Lei, Electrocatalytic oxidation and reduction of H2O2 on vertically aligned Co3O4 nanowalls electrode: Toward H2O2 detection, J.
It can be seen that all the main peaks can be indexed undisputedly as the pure Fe3O4 of spinel structure (space group: Fd-3m), which was in good agreement with the standard data (JCPDS card 19-0629).
The Co-doped Fe3O4 nanoparticles exhibits reduction of H2O2 starting around -0.3 V in 0.01M phosphate buffer (pH 7.0) containing 7 mM H2O2 (curve b), which may be applied as the quantitative analysis.
Seong, Electrocatalytic reduction of hydrogen peroxide by silver particles patterned on single-walled carbon nanotubes, Sensor.
Lei, Electrocatalytic oxidation and reduction of H2O2 on vertically aligned Co3O4 nanowalls electrode: Toward H2O2 detection, J.
Online since: May 2009
Authors: Hector Osorio, Juan Pablo Cárdenas, David S. Holmes, Jorge H. Valdés
In addition, in the
laboratory, it can grow in anaerobic or microaerophilic conditions, coupling the oxidation of sulfur
(S0) or formate to the reduction of Fe(III) [2,3].
The sparse information that is available has not been linked to genome data, impeding a more detailed understanding of the versatility and dynamics of anaerobic respiration.
Other predicted regulatory targets are: fdhBD, encoding subunits of formate dehydrogenase that is predicted to couple formate oxidation to Fe(III) reduction [2]; hupSL encoding an uptake hydrogenase system in cells grown under N2-fixing (anaerobic) conditions [9]; sreABCE that encodes subunits of a sulfur reductase system involved in the reduction of elemental sulfur with hydrogen as electron donor [10]; glnB, a P2 regulator of nitrogen fixation; adhP (alcohol dehydrogenase) and ldh (lactate dehydrogenase), both implicated in NAD + restoration by fermentation processes.
These predictions support models of anaerobic metabolism in which: pathways could be activated for hydrogen oxidation coupled with sulfur reduction; nitrogen fixation could be regulated; a high affinity terminal oxidase for oxygen could be downregulated; formate oxidation and fermentation pathways could be activated.
The sparse information that is available has not been linked to genome data, impeding a more detailed understanding of the versatility and dynamics of anaerobic respiration.
Other predicted regulatory targets are: fdhBD, encoding subunits of formate dehydrogenase that is predicted to couple formate oxidation to Fe(III) reduction [2]; hupSL encoding an uptake hydrogenase system in cells grown under N2-fixing (anaerobic) conditions [9]; sreABCE that encodes subunits of a sulfur reductase system involved in the reduction of elemental sulfur with hydrogen as electron donor [10]; glnB, a P2 regulator of nitrogen fixation; adhP (alcohol dehydrogenase) and ldh (lactate dehydrogenase), both implicated in NAD + restoration by fermentation processes.
These predictions support models of anaerobic metabolism in which: pathways could be activated for hydrogen oxidation coupled with sulfur reduction; nitrogen fixation could be regulated; a high affinity terminal oxidase for oxygen could be downregulated; formate oxidation and fermentation pathways could be activated.
Online since: June 2014
Authors: Luis Henrique Leme Louro, Marcelo Henrique Prado da Silva, José Brant de Campos, Carlos Frederico de Matos Chagas, Willian Trindade, Alaelson Vieira Gomes
The microscopic driving force operating during sintering is the reduction of the excess energy associated to surfaces.
The energy reduction can happen by the reduction of the total area by increasing the average particle size, and/or by substituting solid/vapor interfaces by solid/solid interfaces in the grain boundaries, leading to densification, with concomitant grain growth.
As a result, pore reductions as well as grain growth are promoted.
These results provided very important data regarding the amount of the niobate second phase in the investigated temperatures.
The energy reduction can happen by the reduction of the total area by increasing the average particle size, and/or by substituting solid/vapor interfaces by solid/solid interfaces in the grain boundaries, leading to densification, with concomitant grain growth.
As a result, pore reductions as well as grain growth are promoted.
These results provided very important data regarding the amount of the niobate second phase in the investigated temperatures.
Online since: November 2012
Authors: Zheng Ren, Meng Di Zhang, Li Jie Sun, Shao Jian Hu, Yan Ling Shi, Hui Zhou, Xi Li
This paper collects measure data from 1000 MOSFET devices.
The fitting curve of simulation data and measure data of PSP statistical model can reflect the accuracy of the statistical model.
The contrast of simulation data and measure data on the correlation between NMOS and PMOS is also an important target.
Fig. 3 is the correlation contrast figure of simulation data and measure data for Vth_gm in narrow devices.
The figure shows that the data of NMOS and PMOS devices for Vth_gm has certain relevance, and the correlation of simulation data closes to the correlation of measure data.
The fitting curve of simulation data and measure data of PSP statistical model can reflect the accuracy of the statistical model.
The contrast of simulation data and measure data on the correlation between NMOS and PMOS is also an important target.
Fig. 3 is the correlation contrast figure of simulation data and measure data for Vth_gm in narrow devices.
The figure shows that the data of NMOS and PMOS devices for Vth_gm has certain relevance, and the correlation of simulation data closes to the correlation of measure data.
Online since: February 2012
Authors: Tong Ying Shang Guan, Yang Lian, Di Wu
We established bridge erecting machine’s 3D model, optimized the product’s structure and bridge through-hole speed, provide calculated data for safe and reliable operation of the equipment by finite element calculation.
Take the data of five seconds later for linear regression fitting and averaging, the obtained data statistics are shown in tab 1.
COMOSWorks used “fatigue strength reduction factor (Kf)” to solve the contradiction between actual fatigue damage and the S-N curve.
The setting range of the fatigue strength reduction factor is 0~1.
Designers can do qualitative judgment for the product’s function at different angles and by different proportions of the virtual model. ②Provide theory and design development basis for the bridge erecting machine’s reliability design by finite element and kinematic analysis, and improved the design efficiency and the reliability of the equipment operation. ③Carried out fatigue analysis on the behind leg with COSMOSWorks based on the definition of fatigue curve (S-N curve), obtained the behind leg’s service life and other relevant data.
Take the data of five seconds later for linear regression fitting and averaging, the obtained data statistics are shown in tab 1.
COMOSWorks used “fatigue strength reduction factor (Kf)” to solve the contradiction between actual fatigue damage and the S-N curve.
The setting range of the fatigue strength reduction factor is 0~1.
Designers can do qualitative judgment for the product’s function at different angles and by different proportions of the virtual model. ②Provide theory and design development basis for the bridge erecting machine’s reliability design by finite element and kinematic analysis, and improved the design efficiency and the reliability of the equipment operation. ③Carried out fatigue analysis on the behind leg with COSMOSWorks based on the definition of fatigue curve (S-N curve), obtained the behind leg’s service life and other relevant data.
Online since: April 2015
Authors: R.A. Ibrahim, Hammad T. Elmetwally, Ahmad E. Eladaw
Minitab is a statistical software was used to analyze obtained data.
Minitab is defined as a software package to analyze the data.
Data analyse is an important part of quality control.
Measure dimensions of formed glass tube before/after maintenance, and measured data are stored.
c) Control charts: data to obtain control charts.
Minitab is defined as a software package to analyze the data.
Data analyse is an important part of quality control.
Measure dimensions of formed glass tube before/after maintenance, and measured data are stored.
c) Control charts: data to obtain control charts.