Field Evaluation of Hybrid-Composite Girder Bridges in Missouri

摘要: Three hybrid composite beam (HCB) bridges were recently constructed in Missouri, USA. HCB is an innovative idea that incorporates traditional construction materials (steel and concrete) with fiber reinforced polymer (FRP) composites such a manner to optimize the performance of constituents. The consists self-consolidating concrete (SCC) poured classical arch shape tied at ends by conventional prestressing strands. steel are tucked inside durable fiberglass shell voids filled polyiso foam. An integrated study was implemented on three investigate in-service behavior. included quality control/quality assurance (QC/QA) testing program. As part this research study, infrared (IR) thermal imaging approach developed detect section during its casting. found be ideal solution for QC/QA placement. A series load tests together meticulous theoretical numerical analyses executed. first finite element analysis (FEA) bridge superstructure accomplished. used provide better understanding girder behavior emphasize areas need more examination. Based FEA results existing flexural design methodology assumptions tested. unable maximum compressive stress arch, strain compatibility assumption invalid. However, experimental measurements along mathematical calculations indicate owns abundant nominal bending shear strength withstand expected loads lifetime. modified based same as one produced. achieve significant enhancement predicting stresses under service loads. durability tested through subjecting different aging regimes. possesses excellent relation weathering exposure Missouri. Longer regimes currently being examined verify these results.