Ductility Analysis Of Prestressed Concrete Frame Node

The prestressed concrete frame structure has got he rapid development and application in recent years, in view of the ordinary reinforced concrete frame node area, it's stress analysis, the ductility performance and so on has been conducted the massive research, and carried on many node performance test; but, with regard to prestressed concrete frame node, the phenomenon of node destruction has been carried out, and has been only carried on the partial node model test, research focus on comparing to ordinary concrete at nodes, the influential factors of the core area stirrup ratio and degree of prestress has not yet to develop, while the degree of prestress, stirrup ratio and concrete level have the influence to the node destruction process and the ductility.In view of the prestressed reinforcement concrete frame node area in this paper, considering the degree of prestress, the concrete level and the core area stirrup ratio, the ductility of the prestressed reinforcement concrete frame side column node is carried on finite element analysis. The main work as following:(1) Evolution and the development of the prestressed reinforcement concrete frame node design concept are summarized, the prestressed reinforcement concrete frame node research development is introduced, the main research contents of paper are proposed.(2) Theoretical research of reinforced concrete finite element analysis. Based on the large-scale finite element analysis software ADINA, constitutive models and failure criteria of concrete and steel are elaborated. Through selecting analysis method, the input parameters were analyzed.(3) The numerical simulation research of prestressed reinforced concrete frame node ductility properties. Prestressed concrete framework side column model, the low cyclic loading finite element analysis is designed is carried out by adopting ADINA finite element analysis software. The degree of prestress, the concrete level and the core area stirrup ratio to the ductility performance influence are analyzed. (4) Analysis shows: The prestressed reinforcement concrete frame node ductility performance relate to degree of prestress, the concrete level and the core area stirrup ratio. The degree of prestress between 0.45-0.55, the ductility performance is better, so, it is suggested we should control node pre-stressed between 0.45-0.55 to enhanced the node the ductility performance; The concrete level have certain influence to the node ductility performance, the node ductility of C40, C50 concrete is better and considered firstly; the increasing of core area stirrup ratio can able to enhance the node ductility performance.