CRACK CONTROL VIA STRESS-STRAIN CONTROL IN CONTINUOUS CONCRETE GIRDERS OF VARIABLE MOMENT OF INERTIA

TO ACHIEVE THE ACCURATE ANALYSIS REQUIRED FOR CRACK CONTROL IN VARIABLE-I CONTINUOUS GIRDERS, A GENERAL PRECISE THREE-MOMENT EQUATION ID DRIVED FOR SUCH GIRDERS. DERIVATION IS DONE BY INCLUDING THE EFFECT OF SHEARING STRAIN ENERGY IN ADDITION TO THAT OF FLEXURAL STRAIN ENERGY. ITS APPLICATION ULTIMATELY LEADS TO AN ACCURATE DETERMINATION OF MOMENTS, SHEARS, AND REACTIONS, AND, HENCE, A MORE REALISTICAL MAGNITTUDE IN THE DISTRIBUTION OF LONGITUDINAL (FLEXURAL) AND VERTICAL (HEARING) NORMAL STRESSES. WORKING EQUATIONS ARE DEVELOPED FOR THE DETERMINATION OF SHEARING STRESS DISTRIBUTION IN A T-SECTION. MAXIMUM TENSILE STRESSES AND STRAINS AT ANY POINT IN ANY DIRECTION MAY THEN BE OBTAINED BY MATHEMATICAL TECHNIQUES OF THREE-DIMEMSIONAL ELASTICITY. THROUGH APPROPRIATE DESIGN TO KEEP TENSILE STRESS AND/OR TENSILE STRAIN WITHIN THE MINIMUM ALLOWABLE IN CONCRETE DURING VARIOUS STAGES OF ITS LIFE, CRACKS CAN BE POSITIVELY CONTROLLED DURING THE DESIGN STAGE. /RRL/A/

• Supplemental Notes:
  • pp 317-342, 5 FIG
• Corporate Authors:

  Intl Symp Concr Bridge Des Proc /Can

  ,    
• Authors:
  • Li, Shengbo Eben
  • Witt, R A
• Publication Date: 1969

Subject/Index Terms

• TRT Terms: Beams; Concrete; Continuous structures; Control; Cracking; Equations; Flexure; Girders; Moments of inertia; Physical distribution; Shear strength; Strain (Mechanics); Stresses; Tension
• Uncontrolled Terms: Continuous beams; Tensile stress
• Old TRIS Terms: Moment of inertia; Strains
• Subject Areas: Bridges and other structures; Freight Transportation; Highways;

Filing Info

• Accession Number: 00208689
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Nov 18 1970 12:00AM