Acceleration in the building floors using the Seismo-Geodynamic Theory

Abstract

THE EXPERIENCE HAS INDICATED THE IMPORTANCE IN THE SEIS MIC BEHAVIOR OF BUILD INGS AND IN THE STRUCTURAL PROBLEMS TAKING PLACE IN THE UPPER FLOORS OF TALL BUILDINGS, DURING DESTRUCTIVE EARTH QUAKES. THE INTEREST HAS AROUSED IN THE APPLICATION OF THE ""SEISMO GEODYNAMICS THE ORY"" TO SOLVE THE SEIS MIC PROBLEMS OF THE SUB SOIL AND FOUNDATIONS, AND THE METHOD TO CALCULATE THE ACCEL ERATION IN THE FLOORS OF BUILDINGS BECAUSE OF THE SEIS MIC EFFECT OF THE VERTICAL AND HORIZONTAL ROTATIONS OF THE FOUNDATION, AND TO VERIFY IF THE STRUCTURE OF THE BUILDING CAN TAKE SAFE THE SEIS MIC FORCES. AN IMPORTANT SEIS MIC OBSERVATION WAS MADE BY THE AUTHOR IN 1962, FROM THE RECORDED SEUDO-ACCELERATION RESPONSE SPECTRUMS, OBTAINED AT THE GROUND SURFACE OF THE CENTRAL PARK AND THOSE OBTAINED AT THE BASE OF THE RIGID FOUNDATION OF THE TOWER LATINO AMERICANA IN MEXICO CITY. THE AUTHOR FOUND THAT THE RATIO OF THE ACCELERATIONS FOR 10.0% CRITICAL DAMPING BETWEEN THESE TWO PLACES, LESS THAN ONE HUNDRED METERS APART, SHOWED THAT THE RIGID BOX TYPE FOUNDATION OF THE “TOWER LATINO” SUFFERED ONLY ON THE ORDER OF 50% TO 60% OF THE ACCELERATION WITH RESPECT TO THE SPECTRAL ACCELERATION AT THE GROUND SURFACE IN THE CENTRAL PARK. THE ABOVE OBSERVATION WAS VERIFIED THEORETICALLY BY THE AUTHOR.