How much temperature gradient is common in bridges?

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I.N. Tsiptsis

this video might help with analysis duration considering also eigenmode analysis: https://www.youtube.com/watch?v=kQirNk2idmU

For temperature gradients you have to look at relevant DINs since there are different limits for horizontal, vertical and additional safety temprerature (see eurocodes also)

However, according to AASHTO, steel bridges are designed for a minimum bridge temperature of -18 oC and -34 oC in the mild and cold climate zones, respectively, with a maximum bridge temperature of 49 oC in both zones.

Mohamed-Mourad Lafifi

Dear Mohammad Maldar,

I suggest you to see linkse in subject.

-A Study of Temperature and Aging Effects on Eigenfrequencies of ...

https://www.scirp.org/journal/PaperInformation.aspx?PaperID...

- Effects of Temperature on Bridge Dynamic Properties - ROSA P

https://rosap.ntl.bts.gov/view/dot/31280/dot_31280_DS1.pdf

- Comparison of Temperature Loadings of Bridge Girders

https://ojs.cvut.cz/ojs/index.php/ap/article/viewFile/1049/881

- Thermal Stress Analysis of Beam Subjected To Fire - IJERA.com

www.ijera.com/papers/Vol3_issue5/BV35420424.pdf

- Experimental Analysis of Steel Beams Subjected to Fire Enhanced by ...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5324059/

- mechanics of the 21st century - Department of Mechanics and Physics ...

fluid.ippt.pan.pl/ictam04/21ictam2004.pdf

- Thermal Load in Large-Scale Bridges: A State-of-the-Art Review ...

journals.sagepub.com/doi/full/10.1155/2013/217983

Best regards

Jin Fan

I suggest you to use a conservative gradient( bigger range), because steel bridges are very sensitive to temperature change. You'd better also consider temperature gradient in 3 directions: longitudinal, transverse, and vertical.

Temperature has no direct effect on vibrational properties of the structure, but it may cause damage to it. Therefore it can change the physical parameters and then it may affect the natural frequency.