A NEW IDENTIFICATION METHODOLOGY FOR INCIDENT SEISMIC WAVE AT ENGINEERING BASEMENT BASE ON DYNAMIC RESPONSE ANALYSIS IN TIME DOMAIN

Abstract

 Incident seismic waves at the engineering basement are frequently used for the numerical simulation of damaged structures and generally estimated using earthquake observation accelerations recorded at ground surfaces. The estimation method commonly used is based on frequency domain analysis such as analytical code, SHAKE. However, the equivalent linear approximation for non-linear ground characteristics in the estimation cannot give high accurate incident waves during strong earthquakes.

 In this research, we attempted to identify seismic incident waves at engineering basement based on the dynamic response analysis in time domain. As examples of identifying the seismic wave, the sinusoidal waves of the period of 0.1 and 2.0 seconds at the basement were input to a homogeneous multi-layer ground with linear characteristic in order to verify the availability of the proposed method. We introduced the weighted estimation step width to the procedure in identifying the input wave amplitude. As the results, the identified input seismic waves were decent accurate and the proposed method has a possibility of evaluating incident waves at engineering basement from ground surface observed records.