# Transient thermal analysis

**URL:** <https://prepomax.discourse.group/t/transient-thermal-analysis/685>\
**Category:** General Questions\
**Created:** [January 25, 2023, 12:58pm UTC](https://prepomax.discourse.group/t/transient-thermal-analysis/685 "2023-01-25T12:58:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![O.Mol](https://avatars.discourse-cdn.com/v4/letter/o/ec9cab/32.png) [@O.Mol](https://prepomax.discourse.group/u/O.Mol)\
**Post date:** [January 25, 2023, 12:58pm UTC](https://prepomax.discourse.group/t/transient-thermal-analysis/685/1 "2023-01-25T12:58:42Z")

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Dear All,

I ‘m using your software for the transient thermal analysis.

How can I use/implement a temperature curve (time-dependent temperature) as fire exposure in the program?

Thank you very much.

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**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\
**Post date:** [January 25, 2023, 4:04pm UTC](https://prepomax.discourse.group/t/transient-thermal-analysis/685/2 "2023-01-25T16:04:10Z")

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You can use the amplitude feature for this purpose. It’s described in the documentation.

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**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\
**Post date:** [January 25, 2023, 8:44pm UTC](https://prepomax.discourse.group/t/transient-thermal-analysis/685/3 "2023-01-25T20:44:12Z")

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Hi,

There is a phenomenal study case originally posted in the MECWAY forum.

[gemada] was able to replicate the 60min, 90min,120 min isotherms of a 300x600 concrete beam like the one shown in EC2. I have translated it to the Prepomax Version.

It can be an example of \*Amplitude to set up the varing ambient temperature profile requested by the code:

T=20+345_log(8_t+1)/log(10) [ºC,min] (ISO834 curve, used internationally for fire resistance testing of components. The standard temperature-time curve is given by equation (3.4) in EC1-1-2)

[Eurocode 2 - fire resistance of concrete structures study case - Forum](https://mecway.com/forum/discussion/1022/eurocode-2-fire-resistance-of-concrete-structures-study-case).

 ![EC2 Curves](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/355b78c6bd71152fdb7a3f6ac679b4a65e3968c0.jpeg)

[Fire Resistance viga-EC2-300-600 m.pmx](https://prepomax.discourse.group/uploads/short-url/oqrEQVz4fhqTNp5oqukKpWTEs43.pmx) (101.6 KB)

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<div class="post-metadata">

**Author:** ![O.Mol](https://avatars.discourse-cdn.com/v4/letter/o/ec9cab/32.png) [@O.Mol](https://prepomax.discourse.group/u/O.Mol)\
**Post date:** [January 26, 2023, 8:18am UTC](https://prepomax.discourse.group/t/transient-thermal-analysis/685/4 "2023-01-26T08:18:17Z")

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Thank you both for your feedback. You have helped me a lot!  
Kind regards