Degree
Doctor of Philosophy (PhD)
Department
Department of Civil and Environmental Engineering
Document Type
Dissertation
Abstract
The purpose of this research is to comprehensively study the behavior of link slabs in jointless deck bridges, focusing on design limitations, structural performance, and long-term maintenance cost reductions. Expansion joints, traditionally used to accommodate thermal movements in bridges, are a primary source of deterioration, increased maintenance costs, and structural deficiencies. Link slabs provide an alternative by enabling partial continuity, reducing joint-related issues while maintaining flexibility. However, practical limitations such as segment length constraints, support conditions, and temperature effects remain insufficiently explored in the literature. This research addresses these gaps through a detailed parametric investigation.
A finite element modeling (FEM) approach is used to analyze various partially continuous and non-continuous bridge configurations. The study is structured into three phases. Phase 1 evaluates the influence of girder types, girder spacing, support conditions, and bearing stiffness on link slab behavior. Phase 2 determines the maximum feasible segment lengths using elastomeric bearing pads, incorporating thermal movement limitations. Phase 3 extends the analysis by comparing PTFE bearings (sliding plates) with elastomeric pads to assess their suitability in high-movement applications.
The findings reveal that link slabs improve durability by reducing joint maintenance needs while enhancing structural performance. The redistribution of forces within the link slab and girders, changes in support reactions, and serviceability considerations demonstrate the advantages of this design approach. A Life Cycle Cost Assessment (LCCA) quantifies long-term economic benefits, showing that continuous deck bridges significantly reduce maintenance costs compared to traditional expansion-jointed designs. The financial savings associated with eliminating expansion joints can be substantial when applied across larger bridge networks.
This research provides practical recommendations for typically used girder spacing, joint configurations, and bearing selection. The results offer valuable insights for bridge owners, designers, and transportation agencies, supporting the wider adoption of partially continuous deck systems. By improving the understanding of link slab behavior, this study contributes to the development of durable, cost-effective, and resilient bridge infrastructure. The findings emphasize the potential for long-term cost savings, reduced maintenance interventions, and improved structural performance, making partially continuous bridge designs a viable alternative for enhancing the sustainability of bridge infrastructure.
Date
3-28-2025
Recommended Citation
Babaizadeh Roshanfekr, Hamed, "Analysis and Limitations of Link Slabs in Jointless Deck Bridges" (2025). LSU Doctoral Dissertations. 6715.
https://repository.lsu.edu/gradschool_dissertations/6715
Committee Chair
Okeil, Ayman.
Included in
Computational Engineering Commons, Construction Engineering and Management Commons, Other Civil and Environmental Engineering Commons, Structural Engineering Commons, Transportation Engineering Commons