Reliability analysis of steel chimney considering multi-dimensional stochastic earthquake action
Chimney is a kind of high towering structure that discharges the gas or soot caused by fire into the air and improves the combustion conditions.In order to accurately analyze the seismic performance of steel chimney under multi-dimensional stochastic ground motions,the POD-dimension reduction method based on random function constraints is utilized to realize the refined simulation of multi-dimensional random ground motions at the probability level.Subsequently,a method for evaluating the overall reliability of the structure is proposed,which takes the relative horizontal displacement angle of the steel chimney section as an index.Furthermore,combined with the probability density evolution method,the structural dynamic response analysis and reliability evaluation of a 60 m high steel chimney were carried out.The results show that the sample set generated by the POD-dimension reduction method has a good satisfactory precision.Under the same threshold condition,the global reliability evaluation method of the structure based on the relative horizontal displacement angle of the steel chimney section is more conservative than the code.
NETL
NSTL
万方数据
