Experimental study on mechanical properties of fire...
Transcript of Experimental study on mechanical properties of fire...
![Page 1: Experimental study on mechanical properties of fire ...kforce.uns.ac.rs/images/Fajlovi/Study_Visit_PM_DTU_LUND... · Experimental study on mechanical properties of fire ... TR_60_1](https://reader030.fdocuments.in/reader030/viewer/2022020413/5b96e6f609d3f2501c8bc14e/html5/thumbnails/1.jpg)
Experimental study on mechanicalproperties of fire exposed
concrete
Aleksandra Zawadowska
Master Thesis Project
![Page 2: Experimental study on mechanical properties of fire ...kforce.uns.ac.rs/images/Fajlovi/Study_Visit_PM_DTU_LUND... · Experimental study on mechanical properties of fire ... TR_60_1](https://reader030.fdocuments.in/reader030/viewer/2022020413/5b96e6f609d3f2501c8bc14e/html5/thumbnails/2.jpg)
Motivation
• Incidents of collapse of concrete buildings due to fireexposure,
• Discrepancies regarding strain and strength models found in literature and Eurocode
Aims• Investigation of stress-strain relations of concrete exposed to
compression at elevated temperatures,
• Comparison of the results with existing models
![Page 3: Experimental study on mechanical properties of fire ...kforce.uns.ac.rs/images/Fajlovi/Study_Visit_PM_DTU_LUND... · Experimental study on mechanical properties of fire ... TR_60_1](https://reader030.fdocuments.in/reader030/viewer/2022020413/5b96e6f609d3f2501c8bc14e/html5/thumbnails/3.jpg)
Methods
• 2 types of tests: - transient (preloaded specimen is heated up until failure or untilmax temperature is reached)
- non-transient (specimen is first heated up and then compresseduntil failure)
• Equipment:- cylindrical oven
- Instron compression machine
![Page 4: Experimental study on mechanical properties of fire ...kforce.uns.ac.rs/images/Fajlovi/Study_Visit_PM_DTU_LUND... · Experimental study on mechanical properties of fire ... TR_60_1](https://reader030.fdocuments.in/reader030/viewer/2022020413/5b96e6f609d3f2501c8bc14e/html5/thumbnails/4.jpg)
Results: non-transient tests
• Initial thermal expansion
• Larger contranction at higher temperatures
![Page 5: Experimental study on mechanical properties of fire ...kforce.uns.ac.rs/images/Fajlovi/Study_Visit_PM_DTU_LUND... · Experimental study on mechanical properties of fire ... TR_60_1](https://reader030.fdocuments.in/reader030/viewer/2022020413/5b96e6f609d3f2501c8bc14e/html5/thumbnails/5.jpg)
Results: transient test
• Test at 60% preloading
-10
-8
-6
-4
-2
0
2
0 100 200 300 400 500 600
Stra
in, ε
[‰]
Temperature [°C]
TR_60_1 TR_60_2 AT, 67,5%, std cured AT, 67,5%, predried Damkjaer, 60%