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Statements

Subject Item

n2:RIV%2F68407700%3A21110%2F13%3A00211996%21RIV14-MSM-21110___

rdf:type

skos:Concept n16:Vysledek

dcterms:description

In modern design of structures such as bridges, airports and railway terminals, sport stadiums and other civil structures, tension components are used more and more often. These components are exposed to climatic conditions, especially to dynamic wind load, which may cause vibrations. Therefore, further investigation of this phenomenon and the circumstances of its occurrence is needed. It depends on many internal and external properties of the structure. The principal factors influencing the eigenvalues are diameter and a length of a member, an internal force and a given order of natural frequency. Natural frequencies of stays can be determined using dynamic analysis or using various published equations. Natural frequencies also depend on assumption of restraining boundary conditions; hinges at the ends of tension members or fixed ends. Members used on bridges are additionally subjected to effects of cyclic traffic loads. Both dynamic wind load and traffic loading are major factors causing high-cycle fatigue of civil engineering structures. At this time, no global research in area of tension bar systems is being conducted. The experimental measuring on the in-situ stays of Troja arch Bridge is in underway. Strain gauges and accelerometers have been fixed to selected bars to measure acceleration and stresses in the stays. The aim of the experiment is to get a representative sample of measurement for determination behaviour and boundary restraining conditions of these stays, made from tension bar systems. Uncertainty exists in the accuracy of the value of logarithmic decrement of the damping. Currently it is possible to obtain values for cables but not as easy for tension bar systems. In modern design of structures such as bridges, airports and railway terminals, sport stadiums and other civil structures, tension components are used more and more often. These components are exposed to climatic conditions, especially to dynamic wind load, which may cause vibrations. Therefore, further investigation of this phenomenon and the circumstances of its occurrence is needed. It depends on many internal and external properties of the structure. The principal factors influencing the eigenvalues are diameter and a length of a member, an internal force and a given order of natural frequency. Natural frequencies of stays can be determined using dynamic analysis or using various published equations. Natural frequencies also depend on assumption of restraining boundary conditions; hinges at the ends of tension members or fixed ends. Members used on bridges are additionally subjected to effects of cyclic traffic loads. Both dynamic wind load and traffic loading are major factors causing high-cycle fatigue of civil engineering structures. At this time, no global research in area of tension bar systems is being conducted. The experimental measuring on the in-situ stays of Troja arch Bridge is in underway. Strain gauges and accelerometers have been fixed to selected bars to measure acceleration and stresses in the stays. The aim of the experiment is to get a representative sample of measurement for determination behaviour and boundary restraining conditions of these stays, made from tension bar systems. Uncertainty exists in the accuracy of the value of logarithmic decrement of the damping. Currently it is possible to obtain values for cables but not as easy for tension bar systems.

dcterms:title

Tension bar systems under cyclic loading Tension bar systems under cyclic loading

skos:prefLabel

Tension bar systems under cyclic loading Tension bar systems under cyclic loading

skos:notation

RIV/68407700:21110/13:00211996!RIV14-MSM-21110___

n16:predkladatel

n17:orjk%3A21110

n4:aktivita

n15:S

n4:aktivity

S

n4:dodaniDat

n8:2014

n4:domaciTvurceVysledku

n10:3247414

n4:druhVysledku

n12:O

n4:duvernostUdaju

n9:S

n4:entitaPredkladatele

n5:predkladatel

n4:idSjednocenehoVysledku

110331

n4:idVysledku

RIV/68407700:21110/13:00211996

n4:jazykVysledku

n11:eng

n4:klicovaSlova

cyclic loading; tension bar systems; eigenfrequency; Troja Bridge

n4:klicoveSlovo

n7:Troja%20Bridge n7:eigenfrequency n7:tension%20bar%20systems n7:cyclic%20loading

n4:kontrolniKodProRIV

[126459D92362]

n4:obor

n14:JM

n4:pocetDomacichTvurcuVysledku

1

n4:pocetTvurcuVysledku

1

n4:rokUplatneniVysledku

n8:2013

n4:tvurceVysledku

Teplá, Radka

n6:organizacniJednotka

21110