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| rdf:type
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| Description
| - Large-span prestressed concrete box girders typically exhibit during the initial years deceptively small deflections, or the deflections may even go upwards. However, optimistic expectations are premature. After about three to ten years, the deflections may begin to increase rapidly, become excessive. It is shown that, in order to predict the deflections correctly, one must use a creep and shrinkage model that realistically describes the moisture diffusion process, which causes that the shrinkage and drying creep of the thick bottom slab of the box cross section are greatly delayed compared to the thin top slab. This delay cannot be predicted with the classical approach, in which either the shrinkage strain and the creep coefficient (or compliance function) are considered as uniform throughout the cross section, or the thickness effect is simply described by a multiplicative factor on shrinkage strain.
- Large-span prestressed concrete box girders typically exhibit during the initial years deceptively small deflections, or the deflections may even go upwards. However, optimistic expectations are premature. After about three to ten years, the deflections may begin to increase rapidly, become excessive. It is shown that, in order to predict the deflections correctly, one must use a creep and shrinkage model that realistically describes the moisture diffusion process, which causes that the shrinkage and drying creep of the thick bottom slab of the box cross section are greatly delayed compared to the thin top slab. This delay cannot be predicted with the classical approach, in which either the shrinkage strain and the creep coefficient (or compliance function) are considered as uniform throughout the cross section, or the thickness effect is simply described by a multiplicative factor on shrinkage strain. (en)
- Mosty z předpjatého betonu velkých rozpětí typicky klamavě vykazují v průběhu prvních let menší deformace, nebo dokonce průhyby směřující vzhůru. Tato optimistická očekávání však jsou předčasná. Po třech až deseti letech mohou tyto průhyby rapidně narůst a sát se nadměrnými. Prokazuje se, že pro správnou predikci průhybů je nutné realisticky modelovat smršťování a dotvarování betonu s ohledem na proces difuse vlhkosti vyvolávající zpoždění dotvarování a smršťování spodní tlusté desky komorového průřezu ve srovnání s tenčí horní deskou. Toto zpoždění nelze predikovat klasickým postupem kde deformace vyvolané smršťováním a součinitele dotvarování jsou uvažovány jako jediné pro celý průřez, anebo vliv tloušťky je zaveden jako multiplikační faktor. (cs)
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| Title
| - Box Girder Bridge Deflections
- Box Girder Bridge Deflections (en)
- Průhyby komorových mostů (cs)
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| skos:prefLabel
| - Box Girder Bridge Deflections
- Box Girder Bridge Deflections (en)
- Průhyby komorových mostů (cs)
|
| skos:notation
| - RIV/68407700:21110/06:01127694!RIV07-GA0-21110___
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(1F45E/020/120), P(1M0579), P(GA103/06/0674)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
| |
| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
| |
| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21110/06:01127694
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - box girder bridge; concrete bridge; creep; deflection; long-span bridge; long-term deflection; shrinkage (en)
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| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| |
| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Kohoutková, Alena
- Křístek, Vladimír
- Bažant, Z.
- Zich., M.
|
| issn
| |
| number of pages
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| http://localhost/t...ganizacniJednotka
| |
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