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Multiple damage detection in complex bridges based on strain energy extracted from single point measurement

Alireza ARABHA NAJAFABADI, Farhad DANESHJOO, Hamid Reza AHMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 722-730 doi: 10.1007/s11709-020-0624-5

Abstract: The use of modal-based methods to identify damage in complex bridges is always associated with problems

Keywords： damage detection strain energy influence line complex bridges rotation displacement

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Life cycle and performance based seismic design of major bridges in China

FAN Lichu

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3, Pages 261-266 doi: 10.1007/s11709-007-0033-z

Abstract: The idea of life cycle and performance based seismic design of major bridges is introduced.components, different seismic design levels and expected performance objectives are suggested for the major bridgesare also proposed to be the important issues to study in order to guide the seismic design of major bridges

Keywords： controllability progressive reparability different important

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Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0980-z

Abstract: flutter-related failures is a significant concern in the wind-resistant design of long-span suspension bridgesBased on the dynamic characteristics of suspension bridges with spans ranging from 888 to 1991 m, weFinite element models of suspension bridges with increasing span from 1000 to 5000 m were constructedaerodynamic configuration optimistic optimizations for flutter are essential for super long-span suspension bridges

Keywords： suspension bridge super long-span finite element model aerodynamic instability aerodynamic configuration

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Design concept of the Twin River Bridges in Chongqing, China

Man-Chung TANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4, Pages 427-431 doi: 10.1007/s11709-011-0134-6

Abstract: Together, they are called the Twin River Bridges.Aesthetics were carefully considered for the design of these bridges because of their visibility in the

Keywords： long span bridges partially cable-supported girder bridge cable-stayed bridge extradosed steel truss

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Design and construction of super-long span bridges in China: Review and future perspectives

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4, Pages 803-838 doi: 10.1007/s11709-020-0644-1

Abstract: Super-long span bridges demand high design requirements and involve many difficulties when constructedOver the past three decades, a large percentage of the new long-span bridges around the world were builtconstruction practices of the superstructure, the substructure, and the steel deck paving of the long-span bridgesduring the past decades as well as the current operation status of the existing long-span bridges inwhich is expected to guide the development direction for the construction of future super long-span bridges

Keywords： long-span bridges steel box girder design technology construction technology review and future perspectives

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Control of wind-induced vibration of long-span bridges and tall buildings

GU Ming

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1, Pages 51-62 doi: 10.1007/s11709-007-0005-3

Abstract: structures, research on controlling wind-induced vibration of large-scale structures, such as long-span bridges

Keywords： torsional buffeting large-scale semiactive adjustable frequency building aeroelastic

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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 causes of the nonlinearity of self-excited aerodynamic force of bridge are interpreted from such two aspects as amplitude and wind velocity. The concept of “generalized flutter derivative” is proposed, and its physical meaning is illustrated. The graphs of the generalized flutter derivatives of plate and Sutong Bridge section model are plotted. The characteristics of all generalized flutter derivatives are compared and analyzed, and their superiorities are verified. The results indicate that the physical meaning of generalized flutter derivatives are more explicit compared to the traditional ones. It is more convenient to understand the nonlinearity properties of self-excited aerodynamic force of bridge according to the generalized flutter derivatives graphs with the wind velocity as the horizontal coordinate.

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

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GID complex regulates the differentiation of neural stem cells by destabilizing TET2

Frontiers of Medicine doi: 10.1007/s11684-023-1007-9

Abstract: interacts with the core subunits of the glucose-induced degradation-deficient (GID) ubiquitin ligase complex, an evolutionarily conserved ubiquitin ligase complex and is ubiquitinated by itself.The protein levels of GID complex subunits increased reciprocally with TET2 level upon NSC differentiationThe silencing of the core subunits of the GID complex, including WDR26 and ARMC8, attenuated the ubiquitinationOur results illustrated that the GID complex negatively regulates TET2 protein stability, further modulates

Keywords： TET2 GID complex neural stem cells differentiation of neurons

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A practical multi-lane factor model of bridges based on multi-truck presence considering lane load disparities

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4, Pages 877-894 doi: 10.1007/s11709-021-0756-2

Abstract: Many bridge design specifications consider multi-lane factors (MLFs) a critical component of the traffic load model. Measured multi-lane traffic data generally exhibit significant lane disparities in traffic loads over multiple lanes. However, these disparities are not considered in current specifications. To address this drawback, a multi-coefficient MLF model was developed based on an improved probabilistic statistical approach that considers the presence of multiple trucks. The proposed MLF model and approach were calibrated and demonstrated through an example site. The model sensitivity analysis demonstrated the significant influence of lane disparity of truck traffic volume and truck weight distribution on the MLF. Using the proposed approach, the experimental site study yielded MLFs comparable with those directly calculated using traffic load effects. The exclusion of overloaded trucks caused the proposed approach, existing design specifications, and conventional approach of ignoring lane load disparity to generate comparable MLFs, while the MLFs based on the proposed approach were the most comprehensive. The inclusion of overloaded trucks caused the conventional approach and design specifications to overestimate the MLFs significantly. Finally, the benefits of the research results to bridge practitioners were discussed.

Keywords： bridges multi-lane factor traffic load lane load disparity multi-truck presence weigh-in-motion

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Modeling considerations in seismic assessment of RC bridges using state-of-practice structural analysis

Ricardo MONTEIRO, Miguel ARAÚJO, Raimundo DELGADO, Mário MARQUES

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1, Pages 109-124 doi: 10.1007/s11709-017-0389-7

Abstract: The increasing awareness of the general society toward the seismic safety of structures has led to more restrictive performance requirements hence, many times, to the need of using new and more accurate methods of analysis of structures. Among these, nonlinear static procedures are becoming, evermore, the preferred choice of the majority of design codes, as an alternative to complete nonlinear time-history analysis for seismic design and assessment of structures. The many available software tools should therefore be evaluated and well understood, in order to be easily and soundly employed by the practitioners. The study presented herein intends to contribute to this need by providing further insight with respect to the use of commonly employed structural analysis software tools in nonlinear analysis of bridge structures. A comparison between different nonlinear modeling assumptions is presented, together with the comparison with real experimental results. Furthermore, alternative adaptive pushover procedures are proposed and applied to a case study bridge, based on a generic plastic hinge model. The adopted structural analysis program proved to be accurate, yielding reliable estimates, both in terms of local plastic hinge behavior and global structural behavior.

Keywords： nonlinear analysis pushover RC bridges structural modelling software

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Vibration analysis of medium and small span bridges subjected to mixed marshalling freight trains

LI Qi, WU Dingjun, HUANG Xiaobin

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2, Pages 133-138 doi: 10.1007/s11709-008-0019-5

Abstract: reported several times that train derailment occurs when mixed marshalling freight trains traverse bridgesprogram when mixed marshalling freight trains traverse 32-meter-span prestressed concrete simple beam bridgesThe mechanism that dynamic responses of the bridges are prominent and that empty trains are inclinedThese periodic loadings cause severe vibration of bridges.In turn, severe vibration of the bridges produces intensive counteraction to empty vehicles.

Keywords： train-bridge vibration vibration characteristic associated computer train-bridge phenomenon

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Footholds optimization for legged robots walking on complex terrain

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0742-y

Abstract: novel continuous footholds optimization method for legged robots to expand their walking ability on complexslipping or tripping on the edge of obstacles, and to improve its stability and safety when walking on compleximplemented the algorithm on a hexapod robot, and verified its feasibility in a walking experiment on a complex

Keywords： footholds optimization legged robot complex terrain adapting hexapod robot locomotion control

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Special issue: Reliability management of complex system

Frontiers of Engineering Management 2021, Volume 8, Issue 4, Pages 477-479 doi: 10.1007/s42524-021-0175-z

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Seismic design of high-rise towers for cable-stayed bridges under strong earthquakes

Yan XU, Shide HU

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4, Pages 451-457 doi: 10.1007/s11709-011-0127-5

Abstract: presents the first of a series of studies on the seismic design of high-rise towers for cable-stayed bridges

Keywords： high-rise tower cable-stayed bridge strong earthquake seismic design

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Independent cover meshless particle method for complex geotechnical engineering

Jianqiu WU, Yongchang CAI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 515-526 doi: 10.1007/s11709-017-0428-4

Abstract: A new Independent Cover Meshless Particle (ICMP) method is proposed for the analysis of complex geotechnicalsimple formulation and a low computational cost, and is easy for the numerical analysis and modeling of complex

Keywords： meshless method particle method independent cover CTM geotechnical engineering