FRP strengthing is one of the method of rehabilitation new days. For realisation of real-life situation, I am trying to do an experiment. What type of loading should I use for pre-cracking in my beam. After this, I can strengthen and repair my beam and check the serviceability of beam in fatigue life. Please refer me some papers or documents. There is very few literature on pre-cracking (what I am able to find.) In these literatures, researchers have just used some bending moment envelope to introduce cracking in RC beam without any explanation.
Dear Rajkamal:
Ariadne's paper provides an excellent case study.
In general, the extent of pre-cracking depends on the nature of the repair or retrofit. Repair usually refers to intervention on a damaged structure, and a small amount of pre-cracking is probably insufficient. Retrofit implies a structure that is undamaged, but may be pre-cracked. If you are referring to the latter, you should consider all likely loading patterns that may produce such pre-cracking, including restrained shrinkage, dead load and likely live load patterns. If the former, you should focus on the combination of dead load and the likely live load pattern.
I hope this helps.
Dear Rajkamal,
You shall damage the specimen to an extent of 50% to 60% of loading. inducing damage in the beam or column element. then we shall adopt repair strategy and study the effectiveness of the repair program.
Dear Ms. Ariande, Mr. Arturo and Mr. Vishnuram
I have found this paper (attached) , and in this paper researcher have used the pre-crakcing of beam in their experimentation. Can you please take a look on it and tell me if this loading pattern will be suffice for precracking situation or should be take another factors.(Page 3)
Thanks a lot Ms. Ariande for that paper and Ms. Arturo for your insights regarding loading pattern for repair and retrofit.
Mr. Vishnuram, can you please send me the link/file, where you have found this information 'damage the specimen to an extent of 50% to 60% of loading. inducing damage in the beam or column element. then we shall adopt repair strategy and study the effectiveness of the repair program.'
Dear Rajkamal:
The loading pattern used by Yost et al. is adequate, especially for simply-supported spans with slow moving loads. If there is some rotational fixity at the ends, and/or if the loads are applied dynamically such that there is amplification from impact effects, then the pattern would have to be modified.
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