Using bridge weigh-in-motion systems to monitor single-span bridge influence lines

Aleš Žnidarič (Avtor), Jan Kalin (Avtor)

Povzetek

Bridge weigh-in-motion systems use instrumented bridges or culverts to weigh vehicles as they pass over the structures. They also provide data to allow the calculation of several bridge performance indicators. The article starts with the basics of a bridge weigh-in-motion system and briefly describes two key bridge performance indicators, girder distribution factor and dynamic amplification factor, which are also derived from B-WIM measurements. The central part of the article focuses on monitoring of influence lines, the third key parameter that characterises the bridge performance under traffic loads. First, the method of calculating the bending moment influence lines from random heavy traffic is described. A coefficient of rotational stiffness is introduced, which defines the shape of influence lines around the supports as a linear combination of the ideal simply supported and fixed supported influence lines, to allow quantifying the influence line changes. Then the long-term monitoring of influence lines is investigated on four different single-span test bridges. The initial focus is given on the examination of the effect of temperature on the shape of influence lines. Finally, two sets of influence lines are compared on one test bridge, one from before and the other from after replacing the expansion joints and bearings. The work done so far confirms that calculating of influence lines from random vehicles with a B-WIM system is entirely feasible and that differences in their shape can be detected on single-span bridges. What remains to be investigated is the comparison of these differences to the actual damages and under which circumstances the proposed procedure can compete with or better the routine bridge inspection and the conventional monitoring techniques.

Ključne besede

obtežba mostu;odziv mostu;temperaturna odvisnost;vplivnica;spremljanje stanja;most;bridge loading;bridge response;temperature dependency;influence line;monitoring;

Podatki

Jezik:	Angleški jezik
Leto izida:	2020
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	ZAG - Zavod za gradbeništvo Slovenije
Založnik:	Springer
UDK:	624
COBISS:	24290307
ISSN:	2190-5452
Št. ogledov:	8
Št. prenosov:	2
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	obtežba mostu;odziv mostu;temperaturna odvisnost;vplivnica;spremljanje stanja;most;
Strani:	str. 743-756
Letnik:	ǂVol. ǂ10
Zvezek:	iss. 5
Čas izdaje:	Nov. 2020
DOI:	10.1007/s13349-020-00407-2
ID:	19921194