?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Damage+assessment+in+reinforced+concrete+flexural+members+using+modal+strain+energy+based+method&rft.creator=Wahalathantri%2C+Buddhi+Lankananda&rft.subject=modal+strain+energy+based+method%2C+reinforced+concrete%2C+flexural+members%2C+flexural+cracks%2C+damage+assessment%2C+damage+detection%2C+damage+localization%2C+damaged+plasticity+model%2C+damage+index+method%2C+vibration+based+damage+identification+technique&rft.subject=structural+health+monitoring%2C+MATLAB+based+program&rft.description=Damage+assessment+(damage+detection%2C+localization+and+quantification)+in+structures+and+appropriate+retrofitting+will+enable+the+safe+and+efficient+function+of+the+structures.+In+this+context%2C+many+Vibration+Based+Damage+Identification+Techniques+(VBDIT)+have+emerged+with+potential+for+accurate+damage+assessment.+VBDITs+have+achieved+significant+research+interest+in+recent+years%2C+mainly+due+to+their+non-destructive+nature+and+ability+to+assess+inaccessible+and+invisible+damage+locations.+Damage+Index+(DI)+methods+are+also+vibration+based%2C+but+they+are+not+based+on+the+structural+model.+DI+methods+are+fast+and+inexpensive+compared+to+the+model-based+methods+and+have+the+ability+to+automate+the+damage+detection+process.++DI+method+analyses+the+change+in+vibration+response+of+the+structure+between+two+states+so+that+the+damage+can+be+identified.+Extensive+research+has+been+carried+out+to+apply+the+DI+method+to+assess+damage+in+steel+structures.+Comparatively%2C+there+has+been+very+little+research+interest+in+the+use+of+DI+methods+to+assess+damage+in+Reinforced+Concrete+(RC)+structures+due+to+the+complexity+of+simulating+the+predominant+damage+type%2C+the+flexural+crack.++Flexural+cracks+in+RC+beams+distribute+non-+linearly+and+propagate+along+all+directions.+Secondary+cracks+extend+more+rapidly+along+the+longitudinal+and+transverse+directions+of+a+RC+structure+than+propagation+of+existing+cracks+in+the+depth+direction+due+to+stress+distribution+caused+by+the+tensile+reinforcement.+Simplified+damage+simulation+techniques+(such+as+reductions+in+the+modulus+or+section+depth+or+use+of+rotational+spring+elements)+that+have+been+extensively+used+with+research+on+steel+structures%2C+cannot+be+applied+to+simulate+flexural+cracks+in+RC+elements.+This+highlights+a+big+gap+in+knowledge+and+as+a+consequence+VBDITs+have+not+been+successfully+applied+to+damage+assessment+in+RC+structures.+This+research+will+address+the+above+gap+in+knowledge+and+will+develop+and+apply+a+modal+strain+energy+based+DI+method+to+assess+damage+in+RC+flexural+members.+%0D%0A%0D%0AFirstly%2C+this+research+evaluated+different+damage+simulation+techniques+and+recommended+an+appropriate+technique+to+simulate+the+post+cracking+behaviour+of+RC+structures.+The+ABAQUS+finite+element+package+was+used+throughout+the+study+with+properly+validated+material+models.++The+damaged+plasticity+model+was+recommended+as+the+method+which+can+correctly+simulate+the+post+cracking+behaviour+of+RC+structures+and+was+used+in+the+rest+of+this+study.++Four+different+forms+of+Modal+Strain+Energy+based+Damage+Indices+(MSEDIs)+were+proposed+to+improve+the+damage+assessment+capability+by+minimising+the+numbers+and+intensities+of+false+alarms.++The+developed+MSEDIs+were+then+used+to+automate+the+damage+detection+process+by+incorporating+programmable+algorithms.+The+developed+algorithms+have+the+ability+to+identify+common+issues+associated+with+the+vibration+properties+such+as+mode+shifting+and+phase+change.+To+minimise+the+effect+of+noise+on+the+DI+calculation+process%2C+this+research+proposed+a+sequential+order+of+curve+fitting+technique.+Finally%2C+a+statistical+based+damage+assessment+scheme+was+proposed+to+enhance+the+reliability+of+the+damage+assessment+results.+The+proposed+techniques+were+applied+to+locate+damage+in+RC+beams+and+slabs+on+girder+bridge+model+to+demonstrate+their+accuracy+and+efficiency.%0D%0A%0D%0AThe+outcomes+of+this+research+will+make+a+significant+contribution+to+the+technical+knowledge+of+VBDIT+and+will+enhance+the+accuracy+of+damage+assessment+in+RC+structures.+The+application+of+the+research+findings+to+RC+flexural+members+will+enable+their+safe+and+efficient+performance.&rft.publisher=Queensland+University+of+Technology&rft.date=2012&rft.type=Thesis&rft.format=application%2Fpdf&rft.relation=https%3A%2F%2Feprints.qut.edu.au%2F59509%2F1%2FBuddhi_Wahalathantri_Thesis.pdf&rft.rights=free_to_read&rft.format=application%2Fzip&rft.relation=https%3A%2F%2Feprints.qut.edu.au%2F59509%2F2%2FDAMAGE_INDEX_CALCULATOR_BUDDHI_QUT.zip&rft.relation=Wahalathantri%2C+Buddhi+Lankananda+(2012)+Damage+assessment+in+reinforced+concrete+flexural+members+using+modal+strain+energy+based+method.+PhD+thesis%2C+Queensland+University+of+Technology.&rft.id_number=https%3A%2F%2Feprints.qut.edu.au%2F59509%2F&rft.identifier=Science+%26+Engineering+Faculty