DAMAGE EFFECTS OF PILE DRIVING VIBRATION

摘要: THE INSTRUMENT MOST COMMONLY USED FOR MEASUREMENT OF EARTH OR STRUCTURAL VIBRATION RESULTING FROM PILE DRIVING IS PORTABLE THREE-COMPONENT SEISMOGRAPH. DAMAGE POTENTIAL PILE-DRIVING VIBRATIONS DEPENDS ON DISPLACEMENT AND FREQUENCY VIBRATION. SEVERAL INVESTIGATIONS REVEALED THAT A LEVEL 2.0 IN./SEC /PARTICLE VELOCITY/ SAFE WITH REGARD TO PLASTER CRACKS IN RESIDENTIAL-TYPE STRUCTURES. INTENSITY STEADY-STATE COMPUTED BY AUTHOR. ASSUMING 5.0 SAFETY CURED CONCRETE, RECOGNIZING RATE AT WHICH GREEN CONCRETE ATTAINS STRENGTH, IT POSSIBLE RELATE PERMISSIBLE TIME SINCE PLACING CONCRETE. WHEN DECREASE DISTANCE HAS BEEN EVALUATED PARTICULAR SITE, MAY BE PERMITTED /FOR CERTAIN SIZE HAMMER/ CAN THEN DETERMINED AS FUNCTION CURING TIME. COULD CONCEIVABLE BETWEEN ONE-HALF ONE-FIFTH TRANSIENT EXCITATIONS DUE MAGNIFICATION RESONANCE PRIMARILY INHERENT DAMPING CHARACTERISTICS STRUCTURE.