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Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 46-50

Abstract: justify;">In this paper, Taizhou Bridge, a three-tower suspension bridge was investigated to discover the flutterstability of deck under symmetrical construction through FEM（finite element method） analysis and fullThe assessment of flutter stability during deck construction stage was performed based on analysis ofIn the end, the assessment and management strategy of flutter stability were proposed, which can be referred

Keywords： multi tower suspension bridge     construction stage     flutter stability     management strategy    

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Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 298-304 doi: 10.1007/s11709-007-0039-6

Abstract: The flutter control effect and mechanism of central-slotting, which have gradually been adopted in thedesign and construction of long-span bridges as an effective flutter controlling measure, were investigatedmodel tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling flutterThe results show that central-slotting can not always improve the aerodynamic stability of bridge structureformation and evolution of aerodynamic damping, and flutter modality especially the participation level

Keywords： aerodynamic configuration     aerodynamic performance     flutter mechanism     aerodynamic stability     theoretical    

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Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 272-278 doi: 10.1007/s11709-009-0042-1

Abstract: The concept of “generalized flutter derivative” is proposed, and its physical meaning isThe graphs of the generalized flutter derivatives of plate and Sutong Bridge section model are plottedThe characteristics of all generalized flutter derivatives are compared and analyzed, and their superioritiesThe results indicate that the physical meaning of generalized flutter derivatives are more explicit comparedthe nonlinearity properties of self-excited aerodynamic force of bridge according to the generalized flutter

Keywords： bridge     flutter derivative     generalized flutter derivative     self-excited aerodynamic force     Sutong Bridge    

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identifiedIt was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMoreover, some of the flutter derivatives of each of the other two models identified with the two methodsMore precisely, the frequency-domain method usually results in smooth curves of the flutter derivativesThe formulation of time-domain method makes the identification results of flutter derivatives relatively

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method    

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efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 66-89 doi: 10.1007/s11709-016-0356-8

Abstract: This paper studies optimization of three design parameters (mass ratio, frequency ratio and damping ratio) of multiple tuned mass dampers MTMDs that are applied in a cable stayed bridge excited by a strong wind using minimax optimization technique. ABAQUS finite element program is utilized to run numerical simulations with the support of MATLAB codes and Fast Fourier Transform FFT technique. The optimum values of these three parameters are validated with two benchmarks from the literature, first with Wang and coauthors and then with Lin and coauthors. The validation procedure detected a good agreement between the results. Box-Behnken experimental method is dedicated to formulate the surrogate models to represent the control efficiency of the vertical and torsional vibrations. Sobol’s sensitivity indices are calculated for the design parameters in addition to their interaction orders. The optimization results revealed better performance of the MTMDs in controlling the vertical and the torsional vibrations for higher mode shapes. Furthermore, the calculated rational effects of each design parameter facilitate to increase the control efficiency of the MTMDs in conjunction with the support of the surrogate models.

Keywords： MTMDs     power spectral density     fast Fourier transform     minimax optimization technique     Sobol’s sensitivity indices     Box-Behnken method    

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Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3,   Pages 267-273 doi: 10.1007/s11709-008-0034-6

Abstract: essentials and procedures of computational fluid dynamics (CFD) simulation applicable to evaluating flutterThe proposed methods are employed to identify flutter derivatives of the bridge deck of the Sanchaji

Keywords： discretization     computational     description     Self-anchored Suspension     simulation applicable    

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A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Engineering 2017, Volume 3, Issue 6,   Pages 823-838 doi: 10.1016/j.eng.2017.11.008

Abstract: The critical flutter velocities are also compared for the selected models under laminar flow.

Keywords： Buffeting     Flutter     Long-span bridges     Bridge aerodynamics     Bridge aeroelasticity     Erection stage    

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Solvates and polymorphs of clindamycin phosphate: Structural, thermal stability and moisture stability

Junbo Gong, Dejiang Zhang, Yuanyuan Ran, Keke Zhang, Shichao Du

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 2,   Pages 220-230 doi: 10.1007/s11705-017-1624-4

Abstract: Clindamycin phosphate (CP), an antibacterial agent, has been reported to form several solid-state forms. The crystal structures of two CP solvates, a dimethyl sulfoxide (DMSO) solvate and a methanol/water solvate (solvate V), have been determined by single crystal X-ray diffraction. The properties and transformations of these forms were characterized by powder X-ray diffraction, Single-crystal X-ray diffraction, differential scanning calorimetry, thermo gravimetric analysis, hot-stage microscopy, and dynamic vapor sorption. Very different hydrogen bonding networks exist among the host-host and host-solvent molecules in the two crystal structures, resulting in different moisture stabilities. The thermal stabilities of the two solvates upon heating and desolvation were also studied. When the temperature was above the boiling point of methanol, solvate V converted to a polymorphic phase after a one step desolvation process, whereas the desolvation temperature of the DMSO solvate was below the boiling point of DMSO. At the relative humidity above 43%, the DMSO solvate transformed to a hydrate at 25 °C. In contrast, solvate V did not transform at any of the humidities studied.

Keywords： clindamycin phosphate     solvate     crystal structure     thermal stability     moisture stability    

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Evaluation and prediction of slope stability using machine learning approaches

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 821-833 doi: 10.1007/s11709-021-0742-8

Abstract: In this paper, the machine learning (ML) model is built for slope stability evaluation and meets the

Keywords： slope stability     factor of safety     regression     machine learning     repeated cross-validation    

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Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 727-741 doi: 10.1007/s11709-021-0730-z

Abstract: The accuracy of traditional slice methods for computing the stability safety factor of weakly slopedIn this study, a novel modified Bishop method was developed to improve the accuracy of the stability

Keywords： weakly sloped subgrade     stability analysis     additional force     influential force     modified Bishop method    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Engineering safety during maintenance outages is determined by the stability of the tunnel face.Disregarding the supporting effect of the cutterhead will result in a tunnel face with underestimated stability

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and

Shuvankar DAS; Debarghya CHAKRABORTY

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   Pages 1040-1055 doi: 10.1007/s11709-022-0841-1

Abstract: In the present study, the stability of a vertical rock escarpment is determined by considering the influenceThe change in stability due to the presence of undercut is expressed in terms of a non-dimensional stabilityThe obtained results indicate that undercut can cause a severe stability problem in rock mass havingdeveloped design equation as well as design charts can be useful for practicing engineers to determine the stability

Keywords： undercut     vertical escarpment     stability     Hoek-Brown yield criterion     PCP    

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Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0035-5

Abstract: Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Keywords： finite element power     stability rock escarpment    

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Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity

Zhaomiao LIU, Chengyin ZHANG, Feng SHEN

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 359-368 doi: 10.1007/s11465-011-0222-2

Abstract: The vortex effect is weakened, and the stability of the oil cavity is enhanced with the increase in lubricantinlet speed, depth, and inlet radius of the oil cavity causes the vortex effect to increase and the stability

Keywords： hydrostatic oil cavity     flow state     oil cavity pressure     stability     vortex    

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Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 217-221 doi: 10.1007/s11709-007-0026-y

Abstract: usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stabilityA three-dimensional stability analysis method based on the upper-bound theorem was employed to solve

Keywords： ordinary two-dimensional     randomly     monolith     three-dimensional stability     different    

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Title Author Date Type Operation

Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Journal Article

Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Journal Article

Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Journal Article

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Journal Article

Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Journal Article

A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Journal Article

Solvates and polymorphs of clindamycin phosphate: Structural, thermal stability and moisture stability

Junbo Gong, Dejiang Zhang, Yuanyuan Ran, Keke Zhang, Shichao Du

Journal Article

Evaluation and prediction of slope stability using machine learning approaches

Journal Article

Modified Bishop method for stability analysis of weakly sloped subgrade under centrifuge model test

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and

Shuvankar DAS; Debarghya CHAKRABORTY

Journal Article

Correction to: Effect of undercut on the lower bound stability of vertical rock escarpment using finite

Journal Article

Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity

Zhaomiao LIU, Chengyin ZHANG, Feng SHEN

Journal Article

Three-dimensional stability analysis of the dam foundation at Baise

XU Qianjun, LI Xu, CHEN Zuyu

Journal Article