Aleš Žnidarič (Author), Goran Turk (Author), Maja Kreslin (Author)

Abstract

Prispevek obravnava določitev notranjih statičnih količin cestnih mostov iz podatkov tehtanj vozil med vožnjo (meritev WIM, ang. weigh-in-motion), ki edina zagotovijo celovito in nepristransko sliko o tovornem prometu na merjenem cestnem odseku. Tovrstni podatki so ključni za določitev realnih učinkov prometnih obtežb, s katerimi dokazujemo zadostno varnost mostov, tudi starih in poškodovanih. Takšne mostove bi bilo treba ob upoštevanju obtežnih shem iz sodobnih pravilnikov za mostove pogo- sto zapreti ali jim omejiti prometno obtežbo. Predstavljene so metode, s katerimi iz podatkov WIM izračunamo karakteristične vrednosti notranjih statičnih količin. Posebej smo analizirali metodo konvolucije in rezultate primerjali z rezultati ekstrapolacije ekstremnih vrednosti, najbolj pogostega postopka za napovedovanje maksimalnih pričakovanih vplivov prometa v izbranem obdobju, ter rezultati obsežnih numeričnih simulacij. Veliko pozornost smo namenili izbiri vhodnih parametrov ter načinu od- čitavanja karakterističnih vrednosti, ki bistveno vplivajo na rezultate ekstrapolacij in simulacij. Rezultati kažejo, da daje metoda konvolucije, ki je računsko neprimerno manj zahtevna od ostalih uporabljanih metod, primerljive rezultate. Sočasno so le-ti manj občutljivi za subjektivno izbiro uporabljenih parametrov. Bistveni zaključek analize je tudi, da za zanesljiv račun karakte- rističnih notranjih statičnih količin mostov zaradi prometa potrebujemo s sistemom WIM izmerjene osne pritiske in medosne razdalje vsaj 100.000 tovornih vozil.

Keywords

most;tehtanje vozil med vožnjo;notranje statične količine;konvolucija;simulacija;WIM;B-WIM;odprti dostop;

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Zveza društev gradbenih inženirjev in tehnikov Slovenije
UDC: 624.042.7:69(497.1)(497.4)
COBISS: 102441475 Link will open in a new window
ISSN: 0017-2774
Views: 15
Downloads: 0
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Other data

Secondary language: English
Secondary title: Determination of characteristic internal forces and moments in road bridges from weigh-in-motion data
Secondary abstract: The paper deals with the determination of the internal forces and moments in road bridges from the weigh-in-motion (WIM) data. WIM measurements are the only means that provide a comprehensive and unbiased picture of freight traffic on a me- asured road section. The WIM results are crucial for calculating the actual effects of traffic loads, a key parameter in assessing the structural safety of old and deteriorated bridges. Such bridges would often be closed or moved when analysed with load models from the current design codes. The paper presents methods for calculating the characteristic values of load actions calculated using WIM data. We focused on the convolution method and compared the results with the extreme value extra- polations, the most common procedure for predicting the maximum expected impact of traffic load, and extensive numerical simulations. We paid close attention to the selection of input parameters and the determination of characteristic values that significantly affect the extrapolation and simulation results. Finally, we have shown that the convolution method, which is com- putationally far less demanding than other more commonly used methods, yields comparable results, which are, at the same time, less sensitive to the subjective choice of parameters. The main conclusion of the research is that for a reliable calculation of the characteristic static internal forces and moments in road bridges, we need WIM-measured axle loads and spacings of at least 100,000 heavy goods vehicles.
Secondary keywords: bridge;weigh-in-motion;internal forces and moments;convolution;simulation;WIM;B-WIM;open access;
Pages: str. 82-94
Issue: ǂLetn. ǂ71
Chronology: mar. 2022
ID: 21439533