J Paul Guyer

An Introduction to Substructure Considerations for Post-Tensioned Highway Box Girders J Paul Guyer

Introductory technical guidance for civil and structural engineers interest in design of box girder structures for bridges and highways. Here is what is discussed: 1. INTRODUCTION 2. BENDING MOMENTS CAUSED BY UNIT EFFECTS 3. DEAD LOAD-DC (SELF WEIGHT AND BARRIERRAILING) 4. DEAD LOAD-DW (FUTURE WEARING SURFACE) 5. LIVE LOAD-LL (LANE AND TRUCK COMPONENTS) 6. POST-TENSIONING SECONDARY MOMENTS-UNIT PRESTRESSING FORCE. 7. THERMAL GRADIENT (TG)-20°F LINEAR. 8. MOMENTS RESULTING FROM TEMPERATURE RISE AND FALL 9. MOMENTS RESULTING FROM CONCRETE SHRINKAGE 10. MOMENTS RESULTING FROM CONCRETE CREEP 11. BENDING MOMENTS SUMMARIES 12. POST-TENSIONING FORCE COMPARISON (AFTER ALL LOSSES, WITH THERMAL EFFECTS).