Pultrudedcarbonfibrereinforcedpolymer(P-CFRP)ispopularusedinflexural-strengtheningcivil engineering structuressuch asbeams, slabs, and walls. When a firehappens, thesestructuresand reinforcedmaterialsare simultaneouslyexposed to both high temperatures(potentiallyupto 1200°C) and mechanical loadings atthe sametime. This combined condition is complicated anddifficulttobereplicatedinexperimentalinvestigation.Therefore,thestudiesofCFRPandstructurereinforced with CFRP in fireareraredueto expensive cost of experiments and insufficient theoreticalcalculations.Forthesereasons, thisstudyaimsto investigate the performance of P-CFRP intransientthermalandmechanicalconditionsthatclosetofire,regardingthesimultaneousnessoftheseeffects.Inthetestcondition,themechanicalloadisappliedonP-CFRPmaterialandthenmaintained
thetemperaturesurroundingP-CFRPmaterialisthenincreasedwiththeheatingrateupto30°C/minuteuntilrupture.TheP-CFRPspecimenhasbeentestedatseveralmechanicallevelscorrespondingtofrom10%to68%ofitsultimatestrengthat20°C.Theresultshowsthatwhenthemechanicalloadincreasesfrom10%to50%ofitsultimatestrengthat20°C,thetemperature,atwhichP-CFRPfailure,graduallydecreases.Whenthemechanicalloadincreasesto68%ofitsultimatestrengthat20°C,thefailuretemperatureofP-CFRPsignificantlyreduces.Theexperimentalresultalsoindicatesthat,astheheatingrateincreasesfrom2°C/minuteto26°C/minute,thefailuretemperatureincreasesupto14.6%.TheobtainedresultwellconfirmsthecombinedinfluencebetweenthermalandmechanicalloadingsontheperformanceofP-CFRPatthermo-mechanicalconditions,disregardingthesequenceofloads.ThefailuremodeofP-CFRPatdifferentstudiedcaseswillalsobediscussed.