{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/121302"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/121302","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Bridge optimization considering moving vehicles","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","abstract_has_math":false,"creators":["Golecki, Thomas Farley"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Spencer, Billie F","Baker, William F","Cha, Eun Jeong","Carrion, Juan E","James, Kai A"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-08","date_published":"2023-08","updated_at":"2026-07-22T22:24:57Z","subjects":["Topology Optimization","Stochastic Dynamics","Random Traffic Loading","Vehicle-bridge Interaction","Linear Time-varying System","High-speed Rail"],"languages":["en","eng"],"rights":["Copyright 2023 Thomas Farley Golecki"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/121302","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Spencer, Billie F","Baker, William F","Cha, Eun Jeong","Carrion, Juan E","James, Kai A"]},{"key":"dc:creator","label":"Author","values":["Golecki, Thomas Farley"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-08","2023-06-13"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Topology Optimization","Stochastic Dynamics","Random Traffic Loading","Vehicle-bridge Interaction","Linear Time-varying System","High-speed Rail"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Thomas Farley Golecki"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/121302"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","The student, Thomas Golecki, accepted the attached license on 2023-06-12 at 08:56.","The student, Thomas Golecki, submitted this Dissertation for approval on 2023-06-12 at 11:54.","This Dissertation was approved for publication on 2023-06-13 at 12:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19415 on 2023-12-04 at 17:17:53","Conceptual design of bridge structures is a synthesis of engineering and art. Designing a structure that best meets the needs of the people the bridge will serve is a challenging task. Topology optimization has gained widespread adoption across many fields because of its ability to meet the challenge of conceptual design with a mathematically optimal solution. Some researchers have proposed topology optimization methods for use in bridges, focusing primarily on dead or static loads. To date, the process of determining an optimal form has yet to account for the dynamic nature of bridge traffic. In this work, two different dynamic load cases are considered: random moving vehicle loads on highway bridges, and high-speed rail vehicle-bridge interaction. First, a continuous, filtered white noise representation of random vehicle traffic is developed. This approach separates the loading into a static mean component and a zero-mean stochastic dynamic component. An augmented state space system, including the loading and structure, is then constructed and a random vibration approach is employed to solve for the stochastic responses of the bridge using the Lyapunov equation. By representing the loading separately from the structure, a topology optimization procedure can proceed efficiently. This approach is demonstrated using the density method of topology optimization with an objectivefunction based on the stochastic responses that parallels the probabilistic design intent of modern bridge design codes. The optimal structure minimizes the total response to random traffic loading in terms of the mean and standard deviation of load effects. The resulting topology is then conceptualized into discrete structural components and refined via size and shape optimization to generate a form with uniform structural reliability among components by considering a continuous dynamic reliability constraint. This procedure is demonstrated in numerical examples which show that optimal structural configurations are very similar for reliability constraints. Second, a methodology for topology optimization of high-speed rail bridges is proposed that considers both the bridge responses and the passenger comfort as determined by the accelerations of the train cars. This method evaluates the coupled bridge and train behavior in the time domain as a single time-varying system. By applying a bandpass filter representative of Sperling’s ride index to the train car acceleration responses, a measure of passenger comfort can be included in the optimization objective. The proposed method is demonstrated by optimizing bridge topology to simultaneously minimize bridge displacements and maximize passenger comfort for a range of high-speed train parameters for both individual rail cars and multiple-car trains. The results show that topology optimization can improve ride quality such as passenger comfort at a small cost to the bridge stiffness design objective. The methods developed here enable the conceptual design of both highway and high-speed rail bridges via topology optimization that accounts for the dynamic loading of moving vehicles."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Bridge optimization considering moving vehicles"]}]}],"canonical_facts":{"dc:contributor":["Spencer, Billie F","Baker, William F","Cha, Eun Jeong","Carrion, Juan E","James, Kai A"],"dc:creator":["Golecki, Thomas Farley"],"dc:date":["2023-08","2023-06-13"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01","The student, Thomas Golecki, accepted the attached license on 2023-06-12 at 08:56.","The student, Thomas Golecki, submitted this Dissertation for approval on 2023-06-12 at 11:54.","This Dissertation was approved for publication on 2023-06-13 at 12:52.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19415 on 2023-12-04 at 17:17:53","Conceptual design of bridge structures is a synthesis of engineering and art. Designing a structure that best meets the needs of the people the bridge will serve is a challenging task. Topology optimization has gained widespread adoption across many fields because of its ability to meet the challenge of conceptual design with a mathematically optimal solution. Some researchers have proposed topology optimization methods for use in bridges, focusing primarily on dead or static loads. To date, the process of determining an optimal form has yet to account for the dynamic nature of bridge traffic. In this work, two different dynamic load cases are considered: random moving vehicle loads on highway bridges, and high-speed rail vehicle-bridge interaction. First, a continuous, filtered white noise representation of random vehicle traffic is developed. This approach separates the loading into a static mean component and a zero-mean stochastic dynamic component. An augmented state space system, including the loading and structure, is then constructed and a random vibration approach is employed to solve for the stochastic responses of the bridge using the Lyapunov equation. By representing the loading separately from the structure, a topology optimization procedure can proceed efficiently. This approach is demonstrated using the density method of topology optimization with an objectivefunction based on the stochastic responses that parallels the probabilistic design intent of modern bridge design codes. The optimal structure minimizes the total response to random traffic loading in terms of the mean and standard deviation of load effects. The resulting topology is then conceptualized into discrete structural components and refined via size and shape optimization to generate a form with uniform structural reliability among components by considering a continuous dynamic reliability constraint. This procedure is demonstrated in numerical examples which show that optimal structural configurations are very similar for reliability constraints. Second, a methodology for topology optimization of high-speed rail bridges is proposed that considers both the bridge responses and the passenger comfort as determined by the accelerations of the train cars. This method evaluates the coupled bridge and train behavior in the time domain as a single time-varying system. By applying a bandpass filter representative of Sperling’s ride index to the train car acceleration responses, a measure of passenger comfort can be included in the optimization objective. The proposed method is demonstrated by optimizing bridge topology to simultaneously minimize bridge displacements and maximize passenger comfort for a range of high-speed train parameters for both individual rail cars and multiple-car trains. The results show that topology optimization can improve ride quality such as passenger comfort at a small cost to the bridge stiffness design objective. The methods developed here enable the conceptual design of both highway and high-speed rail bridges via topology optimization that accounts for the dynamic loading of moving vehicles."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/121302"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Thomas Farley Golecki"],"dc:subject":["Topology Optimization","Stochastic Dynamics","Random Traffic Loading","Vehicle-bridge Interaction","Linear Time-varying System","High-speed Rail"],"dc:title":["Bridge optimization considering moving vehicles"],"dc:type":["text"],"thesis:degree_discipline":["Civil Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:57Z"}