FINITE ELEMENT ANALYSIS OF HIGH MODAL DYNAMIC RESPONSES OF COMPOSITE FLOOR SUBJECTED TO HUMAN MOTION UNDER PASSIVE LIVE LOAD

Authors

  • ARASH BEHNIA UNIVERSITY MALAYA
  • AHMAD BENG HONG KUEH UNIVERSITY TECHNOLOGY MALAYSIA
  • MOHAMMAD MEHDI SHAHBAZI UNIVERSITY TEHRAN- CIVIL ENGINEERING DEPARTMENT
  • NAVID RANJBAR UNIVERSITY MALAYA
  • NIMA BEHNIA ISLAMIC AZAD UNIVERSITY- GHAZVIN BRANCH- DEPARTMENT OF CIVIL ENGINEERING
  • MOHAMMAD REZA VAFAEI UNIVERSITY TECHNOLOGY MALAYSIA- FACULTY OF CIVIL ENGINEERING- DEPARTMENT OF STRUCTURE AND MATERIAL

Keywords:

COMPOSITE FLOOR VIBRATION, FINITE ELEMENT ANALYSIS, HUMAN STRUCTURE INTERACTION, HUMAN MOTION LOAD, DYNAMIC RESPONSE, MODAL DAMPING.

Abstract

LIGHT WEIGHT AND LONG SPAN COMPOSITE FLOORS HAVE BECOME POPULAR AND WARMLY PRACTICED NOWADAYS IN MODERN CONSTRUCTIONS. A CRITICAL CONSEQUENCE OF THIS APPLICATION IS UNDESIRED VIBRATION WHICH MAY CAUSE EXCESSIVE DISCOMFORT TO OCCUPANTS. THIS WORK INVESTIGATES THE COMPOSITE FLOOR VIBRATION BEHAVIOR OF AN EXISTING BUILDING BASED ON A COMPREHENSIVE STUDY OF HIGH MODAL DYNAMIC RESPONSES, THE RANGE OF WHICH HAS BEEN ABSENT IN PREVIOUS STUDIES AND MAJOR ANALYTICAL TEMPLATES, OF DIFFERENT PANELS UNDER THE INFLUENCE OF LOADS INDUCED BY HUMAN MOTION. THE RESULTING FUNDAMENTAL NATURAL FREQUENCY AND VIBRATION MODES ARE FIRST VALIDATED WITH RESPECT TO EXPERIMENTAL AND NUMERICAL EVIDENCES FROM LITERATURE. DEPARTING FROM CLOSE CORRELATION ESTABLISHED IN COMPARISON, THIS STUDY EXPLORES IN DETAIL THE EFFECTS OF INTENSITY OF PASSIVE LIVE LOAD AS ADDITIONAL STATIONARY MASS DUE TO CROWD JUMPING AS WELL AS CONSIDERING HUMAN STRUCTURE INTERACTION. FROM OBSERVATION, A NEW APPROACH IN THE SIMULATION OF PASSIVE LIVE LOAD THROUGH THE CONSIDERATION OF HUMAN STRUCTURE INTERACTION AND HUMAN BODY CHARACTERISTICS IS PROPOSED. IT IS CONCLUDED THAT HIGHER VIBRATION MODES ARE ESSENTIAL TO DETERMINE THE MINIMUM REQUIRED MODES AND MASS PARTICIPATION RATIO IN THE CASE OF VERTICAL VIBRATION. THE RESULTS INDICATE THE NEED TO CONSIDER 30 MODES OF VIBRATION TO OBTAIN ALL POSSIBLE IMPORTANT EXCITATIONS AND THEREBY MAKING THIRD HARMONIC OF LOAD FREQUENCY AVAILABLE TO EXCITE THE CRITICAL MODES. IN ADDITION, PRESENCE OF DIFFERENT INTENSITIES OF PASSIVE LIVE LOAD ON THE COMPOSITE FLOOR SHOWED COMPLETELY DIFFERENT BEHAVIOR IN EACH PARTICULAR PANEL ASSOCIATED WITH LOAD COORDINATION OF PANEL AND PASSIVE LIVE LOAD INTENSITY. FURTHERMORE, IMPLEMENTING HUMAN BODY CHARACTERISTICS IN SIMULATION CAUSES AN OBVIOUS INCREASE IN MODAL DAMPING AND HENCE BETTER PRACTICALITY AND ECONOMICAL PRESENTATION CAN BE ACHIEVED IN STRUCTURAL DYNAMIC BEHAVIOR.

Author Biographies

ARASH BEHNIA, UNIVERSITY MALAYA

FACULTY OF ENGINEERING- DEPARTMENT OF CIVIL ENGINEERING-STRUCTURE AND MATERIAL-

AHMAD BENG HONG KUEH, UNIVERSITY TECHNOLOGY MALAYSIA

STEEL TECHNOLOGY CENTER- FACULTY OF CIVIL ENGINEERING- DEPARTMENT OF STRUCTURE AND MATERIAL

MOHAMMAD MEHDI SHAHBAZI, UNIVERSITY TEHRAN- CIVIL ENGINEERING DEPARTMENT

FACULTY OF ENGINEERING- CIVIL ENGINEERING DEPARTMENT- ENGINEERING OPTIMIZATION RESEARCH GROUP

NAVID RANJBAR, UNIVERSITY MALAYA

FACULTY OF ENGINEERING- DEPARTMENT OF CIVIL ENGINEERING-STRUCTURE AND MATERIAL-

NIMA BEHNIA, ISLAMIC AZAD UNIVERSITY- GHAZVIN BRANCH- DEPARTMENT OF CIVIL ENGINEERING

FACULTY OF ENGINEERING- DEPARTMENT OF CIVIL ENGINEERING-STRUCTURE AND MATERIAL-

Published

2013-02-06

Issue

Section

Articles