EFFECT OF CONSTRUCTION EQUIPMENT VIBRATIONS ON NEARBY BUILDINGS
VARIOUS CRITERIA THAT HAVE BEEN USED TO EVALUATE DAMAGE CAUSED TO STRUCTURES BY VIBRATION ARE OUTLINED. THREE TYPES OF GROUND WAVES THAT ARE GENERATED ARE: LONGITUDINAL OR COMPRESSION WAVES IN WHICH LOW FREQUENCIES PREDOMINATE; VERTICAL WAVES IN WHICH HIGH FREQUENCIES PREDOMINATE; AND TRANSVERSE OR SHEAR WAVES THAT BEGIN WITH HIGH FREQUENCIES AND TAPER OFF TO LOW FREQUENCIES. A DAMAGE CRITERION IS DEFINED AS THE MAGNITUDE OF ONE OR MORE QUANTITIES ASSOCIATED WITH THE VIBRATION IMPINGING ON THE STRUCTURE, AND IF EXCEEDED, WILL RESULT IN SOME DEGREE OF FAILURE WITHIN THE STRUCTURE. DATA FROM TESTS CARRIED OUT BY THE BUREAU OF MINES ARE OF 3 CLASSES, NAMELY, MAJOR DAMAGE; MINOR DAMAGE; AND NO DAMAGE. AN EMPIRICAL FORMULA HAS BEEN DEVELOPED THAT GIVES THE AMOUNT OF GROUND ENERGY PRODUCED BY A CHARGE OF DYNAMITE IN TERMS OF A MEASURE OF VIBRATION LEVEL CALLED ENERGY RATIO (ER). ER MAY BE USED FOR THE DETERMINATION OF THE UPPER LIMITS FOR VIBRATION OF MANY TYPES OF CONSTRUCTION ACTIVITY. A STUDY CONDUCTED TO FIND A SIMPLE VIBRATION MEASUREMENT THAT WOULD PROVIDE A DEPENDABLE INDICATION OF DAMAGE RISK IS DESCRIBED. THE STUDY CONCLUDED THAT THERE WAS A WELL-DEFINED THRESHOLD LEVEL OF VIBRATION ABOVE WHICH DAMAGE COULD OCCUR. PEAK PARTICLE VELOCITY GAVE THE BEST INDICATION OF THAT THRESHOLD WHICH OCCURS BETWEEN 4 AND 5 IN./SEC. TESTS ARE DESCRIBED WHICH WERE CONDUCTED TO ESTABLISH THE VELOCITY LEVEL OF VIBRATION FROM DIFFERENT TYPES OF CONSTRUCTION EQUIPMENT AND TO DETERMINE HOW THE VIBRATION VARIES WITH DISTANCE. BLASTING OPERATIONS MUST BE MONITORED BY INSTRUMENTATION, TO ENSURE THAT SAFE VELOCITY LEVELS ARE NOT EXCEEDED. INVESTIGATORS USED A PORTABLE VELOCITY SEISMOGRAPH IN WHICH THREE-AXES VELOCITY SIGNALS ARE RECORDED ON MAGNETIC TAPE AND DISTANT FIELD READOUT IS ACHIEVED BY REDUCING THE TAPE SPEED 10:1 AND DISPLAYING THE SIGNALS ON A PEN-CHART RECORDER BUILT INTO THE INSTRUMENT. DIAGRAMS ILLUSTRATING GROUND WAVES RESULTING FROM VIBRATIONS AND RECORDED SIMULTANEOUSLY BY SEISMOGRAPH. VERTICAL VIBRATIONS, AND LONGITUDINAL VIBRATIONS ARE PRESENTED.
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Corporate Authors:
Highway Research Board
2101 Constitution Avenue, NW
Washington, DC 20418 -
Authors:
- Brown, L M
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Conference:
- 5th Summer Meeting of the Highway Research Board
- Location: Madison Wisconsin, United States
- Date: 1972-7-31 to 1972-8-2
- Publication Date: 1973
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: p. 117-131
- Monograph Title: ENVIRONMENTAL CONSIDERATIONS IN PLANNING, DESIGN, AND CONSTRUCTION
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Serial:
- Highway Research Board Special Report
- Issue Number: 138
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Building; Construction equipment; Construction management; Equations; Evaluation; Explosives; Ground effect; Longitudinal waves; Loss and damage; Seismometers; Vibration
- Uncontrolled Terms: Criteria
- Old TRIS Terms: Construction operations; Empirical equations
- Subject Areas: Construction; Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 00219503
- Record Type: Publication
- ISBN: 0309021529
- Files: TRIS, TRB, ATRI
- Created Date: Apr 3 1974 12:00AM