管式加热炉的抗震可靠性分析

本提出了管式加热炉的可靠性分析方法，并运用该方法对现行抗震设计出来的管式加热炉进行可靠性分析，验证了该方法的适用性，均得到比较满意的结果。

A SEISMIC RELIABILITY ANALYSIS OF PIPE HEATING FURNACE

The traditional crude oil storing equipment designing methods, including those used to design special purpose pipe heating furnace, tend to be the ones mainly concerning safe coefficient rather than trying to ensure the reliability of the actual structure. Thus, it is of great significance both in theory and practice to make efforts to increase the reliability of pipe heating furnace. In view of the accuracy and efficiency of calculating method, this paper takes as its chief objective of its research working out an innovated method with divergent restriction to locate the main invalid forms and figure out the structural reliability index assumed by Ditlevsen method. Our method presented here is focused on the following aspects. First, a value of critical possibility of invalidity is postulated in advance as the original value used by the method of divergent restriction. Secondly, every complete invalid path is supposed to be replaced by its first three sections correspondently. In addition, the number of divergence should be limited. Based on the above thoughts, we also propose a method for reliability analysis of such furnace to calculate the accuracy and efficiency of locating invalid path and obtain the index of reliability. The reliability analysis results prove the applicability of our method through testing two kinds of typical pipe heating furnace designed by the current seismic designing specifications.