Composite bridge design optimisation using HFMI-treatment: Design and optimisation of composite bridges using high frequency mechanical impact (HFMI) treatment

dc.contributor.authorEnglund , Cecilia
dc.contributor.authorDagduk, Saffa
dc.contributor.departmentChalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE)sv
dc.contributor.departmentChalmers tekniska högskola / Institutionen för arkitektur och samhällsbyggnadsteknik (ACE)en
dc.contributor.examinerAl-Emrani, Mohammad
dc.date.accessioned2024-07-02T10:55:06Z
dc.date.available2024-07-02T10:55:06Z
dc.date.issued
dc.date.submitted
dc.description.abstractBridges are structures that are usually subjected to repetitive loading which can cause fatigue damage. Welds are specifically sensitive when considering fatigue problems. Thus, a post-weld treatment called High Frequency Mechanical Impact treatment (HFMI-treatment) is one solution that has the potential to increase fatigue resistance. It can lead to reduced stress concentrations by improving the geometry and introducing counteracting stresses by the weld. Further, it can be useful to use high strength steel to increase the improvement even more. The effect of using HFMI-treatment on new bridge design is still not thoroughly studied. Therefore, HFMI-treatment is investigated by optimising a steel bridge design using higher strength steel and also reducing material usage. A structural design of a road bridge is performed considering the effect of HFMI-treatment of the different welded joints. Additionally, the effect of implementing HFMI-treatment on site when the bridge already has been erected is studied and compared to when treatment is implemented in a workshop. The study indicates that there is a significant decrease in utilisation ratios for fatigue limit states when HFMI-treatment is implemented. The effect of HFMI-treatment together with the use of higher steel grades resulted in enhanced fatigue performance and also remarkable material savings. The most economical option appears to be to use steel strength S460. On the other hand, S690 can help obtain a slender beam for nearly the same cost if the beam height is limited. However, high stress ranges can limit the improvement of HFMI which restricts the possibility of enhancing fatigue strength. The thesis concludes that implementing HFMI-treatment and increasing steel strength, in new bridge designs, can be significantly beneficial. The cost of performing the treatment is insignificant, and there is good potential for material and cost savings. Furthermore, the best outcomes are obtained when the treatment is implemented after erection.
dc.identifier.coursecodeACEX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308199
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectBridges, Fatigue, Welds, Post-weld treatment, High frequency mechanical impact treatment (HFMI-treatment), High strength steels, Optimisation.
dc.titleComposite bridge design optimisation using HFMI-treatment: Design and optimisation of composite bridges using high frequency mechanical impact (HFMI) treatment
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeStructural engineering and building technology (MPSEB), MSc
Ladda ner
Original bundle
Visar 1 - 1 av 1
Hämtar...
Bild (thumbnail)
Namn:
ACEX30 - Dagduk Saffa and Englund Cecilia.pdf
Storlek:
18.5 MB
Format:
Adobe Portable Document Format
Beskrivning:
License bundle
Visar 1 - 1 av 1
Hämtar...
Bild (thumbnail)
Namn:
license.txt
Storlek:
2.35 KB
Format:
Item-specific license agreed upon to submission
Beskrivning: