Advanced approach for seismic design of high-pressure gas facilities 1N kanagawa prefecture, Japan Part 2. Basic concept of ultimate strength design method

摘要

At present, the seismic design of high-pressure gas facilities in Japan is made based by "MITI code". The code is based on the allowable stress design concept and is not effective in evaluating the ultimate resistance of facilities against earthquakes and possible occurrence of earthquakes stronger than that prescribed in the standard has been discussed. In such a background, it became necessary to develop a method for the evaluation of the ultimate seismic resistance of those facilities. This new method is termed as the ultimate strength design method and is derived from the equilibrium equation between the input energy exerted by an earthquake and the energy absorption capacity of a structure. The individual structure is characterized by its own collapse modes such as the failure of substructures, buckling of plates and members,breaking of anchor bolts and so on.