Seismic fragility analysis of reticulated shells based on vector form intrinsic finite element method
An incremental dynamic analysis(IDA)method based on vector form intrinsic finite element is proposed to solve the time-consuming and difficult calculation in the seismic fragility research of reticulated shells.Firstly,the accuracy of the vector form intrinsic finite element method is verified by a Kiewitt-8 single-layer reticulated dome example.Then,12 Kiewitt-8 single-layer reticulated dome models with different parameters are established.The IDA analysis considering the material uncertainty is carried out for them.Finally,peak ground acceleration and maximum node displacement ratio are taken as measure parameters.The seismic IDA curves are built.The fragility curves under three performance levels(immediate occupancy,collapse prevention and global instability)are drawn.The results show that the vector form intrinsic finite element can efficiently and accurately solve the seismic response of the single-layer reticulated dome structures.The increase of roof mass and rise-span ratio will increase the probability of exceeding the three performance levels.For the structure in this paper,the solution time is only 1/15 of the finite element method,the error is within 3%.The change of roof mass and rise-span ratio results in a maximum increase of 75%in seismic risk.
万方数据
维普
