Real-time simulation of ground velocity using digital accelerograph record

This paper firstly discusses the problems which exist in recursive formula for calculating relative velocity of single-degree-of freedom (SDOF) system. Then based on the invariability of recursive equation and center difference, the paper can obtain new recursive formula for calculating relative velocity response of SDOF system, and analyze the precision of that formula. On the basis of above-mentioned research results, the paper presents the real-time numerical recursive method for simulating ground velocity by using the digital accelerograph based on the principle of simple seismic sensors.