COBEM99

S24 Mecânica dos Sólidos

Title:

VERIFICATION OF STRUCTURES SUBMITTED TO DYNAMIC OCCUPANCY LOAD

Summary :

ABSTRACT. MODERN STRUCTURES ARE PROPERLY DESIGNED TO RESIST STATIC LOADS, BUT IN SOME CASES, WHEN THE STRUCTURE IS VERY FLEXIBLE AND/OR SLENDER, IT IS NECESSARY TO CONDUCT A VERIFICATION FOR DYNAMIC LOADS DUE TO HUMAN ACTIVITIES. FOOTBRIDGES IS A PRACTICAL CASE WHERE THIS VERIFICATION IS NECESSARY, WHERE ONLY TRAFFIC DUE TO PEOPLE WALKING CAN GENERATE LEVELS OF VIBRATIONS THAT ARE SO HIGH THAT IT MAY BE UNCOMFORTABLE FOR USE, AND IN SOME CASES, IT MAY COMPROMISE STRUCTURAL SAFETY. IN THE NEED OF TRYING TO SHOW THE IMPORTANCE OF THESE DYNAMIC LOADS GENERATED BY HUMAN ACTIVITIES, THIS WORK PRESENTS A COMPARISON BETWEEN RESULTS FROM A STATIC CONVENTIONAL ANALYSIS AND AN ANALYSIS THAT CONSIDERS DYNAMIC LOADS. THESE ANALYSES WERE CONDUCTED FOR AN EXISTING METALLIC FOOTBRIDGE. FROM DATA OBTAINED IN THE DYNAMIC ANALYSIS, IT COULD BE OBSERVED THAT THE FOOTBRIDGE PRESENTS LEVELS OF DISPLACEMENTS THAT ARE SUPERIOR THAN THE MAXIMUM ALLOWED VALUES IN BRAZILIAN CODES. AFTERWARDS, DUE TO THE NEED OF REDUCING HIGH LEVELS OF VIBRATIONS PRESENTED BY THE FOOTBRIDGE, A VIBRATION ABSORPTION SYSTEM WAS DESIGNED AND A SIGNIFICANT REDUCTION OF DISPLACEMENTS PRESENTED BY THE FOOTBRIDGE WAS OBSERVED. KEY WORDS: DYNAMIC LOADS, VIBRATIONS, AND ABSORPTION SYSTEM.

Author :

de Castro Alves, Nilda Knudsen
Magluta, Carlos 0
Roitman, Ney 0

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