Seismic Response Of Single-layer Latticed Domes Based On OpenSEES

Latticed domes is one of the basic forms of large space structure,and it's stability analysis is the key problem in the design of latticed domes.Under load,single layer latticed domes is likely to appear member buckling before the overall instability,however,in the stability analysis of latticed domes people usually only consider the defects of nodes ignoring member buckling.This paper considered the initial geometrical imperfections of the single-layer latticed domes and simulated the member buckling with initial bending.Then through finite element analysis software OpenSEES,we analyzed the member which is applied initial bending and determined the parameters of the initial bending that can provide appropriate solution to analyze the effect of member buckling on overall stability.Based on domestic and foreign research literature,the main works of this paper are as follows.Under displacement controlled loading mode,this paper using Displacement-based Beam Column unit analyzed the member of applied initial bending and simulated member buckling to determine the parameters: member segment number,integral points,partition of fiber element through OpenSEES.After deciding the modeling analysis method of finite element analysis software OpenSEES,we determined the geometric model by 3D3 S software and adopted Navigator OpenSEES to convert to the form of the command flow.At last we made static analysis and dynamic analysis.It provides a simple modeling method for the analysis of latticed domes through OpenSEES.Carried on dynamic analysis of single-layer latticed domes by OpenSEES.Comparing the two different constitutive materials: steel02 and the ideal elastic plastic,the maximum joints displacement curves of single layer latticed domes are basically consistent at elastic stage,When the structure enters the plasticity,the maximum joints displacement of latticeddomes by the ideal elastic plastic constitutive law is obviously larger than that of the steel02.Radial fibers division had no effect on earthquake response of single-layer latticed domes,but the ring fiber division had effect on it.When the radial fiber is no less than 16,the seismic response of basically will be unchanged.In order to simulate the buckling of members,we need to segment the member,and the segment number had no effect on seismic response of the whole structure of the single-layer latticed domes and the proportion of the yield member.Wether considering the member buckling of single layer latticed domes or not,the peak acceleration-maximum node displacement curve is basically consistent.So is the ratio of yield bar.local shell buckling,for reticulated shell structure of the overall dynamic performance has little effect.Local buckling has little effect on the overall dynamic performance of latticed domes.Considering the buckling of the member,we can obtain as follows by analyzing the influence on the dynamic performance of the single-layer latticed domes of the ratio of rise to span,the roof mass and the span.The ultimate load decreases with the increases of the ratio of rise to span,and the plasticity development gradually deepened with the increase of the ratio of rise to span.With the increases of the mass of roof,the ultimate load decreases,plastic development degree has no obvious law.The span has no regularity effect on the ultimate load and plastic development of latticed domes.