FATIGUE DAMAGE IN SEISMIC STRUCTURES

LOW-CYCLE FATIGUE DAMAGE FACTORS ARE COMPUTED FOR SINGLE- DEGREE-OF-FREEDOM SYSTEMS SUBJECTED TO ACCELEROGRAMS OF THE EL CENTRO EARTHQUAKE (NS COMPONENT) OF MAY 18, 1940, AND THE TAFT EARTHQUAKE (S69 DEGREE E COMPONENT) OF JULY 21, 1952. TWO INTERRELATED HYSTERESIS LOOPS, NAMELY, LOAD MAXIMUM STRAIN CURVE AND DEFLECTION-MAXIMUM STRAIN CURVE, ARE PROPOSED FOR COLUMNS WITH AN AVERAGE WIDE-FLANGE SECTION. THESE HYSTERESIS LOOPS ARE USED FOR FINDING THE TIME HISTORY OF MAXIMUM STRAINS IN THE SHEAR TYPE FRAME UNDER EARTHQUAKE LOADS. THE HISTORY OF PLASTIC STRAINS IS THEN USED TO COMPUTE THE CORRESPONDING CUMULATIVE DAMAGE FACTOR OF THE STRUCTURE. VARIABLES STUDIED INCLUDE FREQUENCY (IN THE ELASTIC RANGE) AND THE YIELD LOAD OF THE STRUCTURE. NUMERICAL RESULTS SHOW THAT (1) IT IS POSSIBLE FOR A STRUCTURE TO FAIL IN LOW-CYCLE FATIGUE UNDER SEISMIC LOADS, AND (2) THIS TYPE OF STRUCTURAL FAILURE CANNOT BE PREDICTED JUST BY STUDYING THE MAXIMUM STRUCTURAL DISPLACEMENTS OF THE STRUCTURE./ASCE/

• Supplemental Notes:
  • Vol 95, No ST8, PROC PAPER 6727, PP 1673-1692, 23 FIG, 3
• Authors:
  • Kasiraj, I
  • Yao, J T
• Publication Date: 1969-8

Media Info

• Serial:
  • Journal of the Structural Division
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Columns; Deflection; Earthquakes; Failure; Fatigue (Mechanics); Hysteresis; Strain (Mechanics); Structural analysis; Structural engineering; Structural mechanics
• Uncontrolled Terms: Fatigue life; Structural failures
• Old TRIS Terms: Strains
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209074
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 21 1994 12:00AM