LIVE LOAD EFFECT ON DYNAMIC RESPONSE OF STRUCTURES

FOR THE ASEISMIC DESIGN OF STRUCTURES, THE DYNAMIC FORCES ARE GENERALLY REPLACED BY EQUIVALENT STATIC FORCES WHICH ARE USUALLY GIVEN AS A FUNCTION OF THE EFFECTIVE WEIGHT OF THE STRUCTURE. THE EFFECTIVE WEIGHT OF A STRUCTURE CONSISTS OF FULL DEAD WEIGHT AND A FRACTION OF LIVE LOADS AS THESE ARE INVARIABLY SPRING AND DASHPOT MOUNTED. THIS PAPER PRESENTS THE EFFECT OF SUCH A MOUNTING ON THE RESPONSE OF STRUCTURES SUBJECTED TO HORIZONTAL GROUND MOTION CAUSED BY AN EARTHQUAKE. THE PRIMARY SYSTEM AS WELL AS LIVE LOAD SYSTEM HAVE BEEN IDEALIZED AS SINGLE DEGREE OF FREEDOM SYSTEMS. THIS STUDY INDICATES THAT ONLY A PART OF THE LIVE LOAD IS EFFECTIVE UNDER HORIZONTAL VIBRATIONS AND THIS DEPENDS ON THE RATION OF LIVE TO DEAD LOAD AND THE AMOUNT OF DAMPING PRESENT IN THE LIVE LOAD MODEL. THE EFFECT OF VARIOUS OTHER PARAMETERS, NAMELY, THE SPRING MOUNTING, UNDAMPED NATURAL PERIOD OF VIBRATION OF THE PRIMARY SYSTEM AND THE FROUND MOTION HAS ALSO BEEN INVESTIGATED. /ASCE/

• Supplemental Notes:
  • Vol 95, No SR4, PROC PAOER
• Authors:
  • Chandrasekaran, A R
  • Saini, S S
• Publication Date: 1969-4

Media Info

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

Subject/Index Terms

• TRT Terms: Dynamic loads; Earthquakes; Live loads; Structural design; Structural engineering; Vibration
• Uncontrolled Terms: Dynamic response
• Old TRIS Terms: Mounting
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209001
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 28 1994 12:00AM