The Research On The Elastic-Plastic Of Space Cast Steel Of Hollow Spherical Joints And Steel Frame Joints

Along with the steady development of the economy, the steel structures are being application extensively because of the special function. During the 1994 Northridge earthquake and 1995 Kobe earthquake, as well as the troubles of the steel structures that appear in the process of construction, the typical beam-column moment connection in steel moment-resisting frame suffered unexpected brittle failures.With favorable high-blooded capability and strong adaption cast steel joints has applied in many largespan-space structures, but there is not a well-rounded design method which can be used.Mainly, the cast steel as brought forward the main body of a book to representative on space structure analysis basis, using the cast steel node in steel framed structure.First. Having introduced development of cast steel node simplely, and brought forward the sort criterion that the designs: Take that ball plasticity analyses as basis, using the nonlinear FEM method.Secondly. The nonlinearity finite element method carrying out ball plasticity on 2 kinds representative three-dimensional space cast steel of hollow spherical joints under axial pressure , the pulling force effect analyses the large-scale common software applying. Have reached node limit load support capability distributing the characteristic , the plasticity developing process , the node destroying mechanism and the node in the various strain under accepting force state. Have revealed the major factor affecting a node bearing the weight of a few of force.Thirdly.Having suggested that section steel in steel framed structure uses the cast steel in the model.By designing that software PKPM takes some project examples as basis, build the three-dimensional space steel frame cast steel model, the general program wielding finite element method has analysed,reached limit load support capability distributing the characteristic,the plasticity developing process , the node destroying mechanism and the node in the various strain under accepting force state to the nonlinearity finite element method carrying out ball plasticity under axial pressure , the curved regulation effect.Finally.Introducing that to cast steel node characteristic property , productive technology as well as the handicraft being under construction does one, analysis does one summary , the problem that the node waits for to study brings forward a little suggestion to cast steel to at the head. The main body of a book research result but the reference data providing to the cast steel node norm that our country works out soon but giving supplies to.