Research On Seismic Behavior Of Precast Concrete Frame Structures Filled With Prefabricated Composite Walls

The cold-formed thin-walled steel composite walls infilled light polymer material has the advantages of light weight,high strength,simple construction,energy saving and heat preservation,and high degree of industrialization.In recent years,as the country vigorously promotes the development of building industrialization,such walls have been widely used in China's Xi'an,Henan,and Anhui.At present,this kind of walls is mainly used as a load-bearing component of low-rise and multi-storey buildings in China,but it is rarely used as enclosure walls in high-rise buildings.In order to promote the application of the composite walls in high-rise structures and further understand the lateral resistance of prefabricated concrete frames with the composite walls structural systems,the seismic performance test of the structure is carried out and the relevant parameter analysis is carried out using finite element software in this paper.The main research work is as follows:?1?The pseudo-static tests of one precast concrete hollow frame specimen and two precast concrete frame with prefabricated composite walls specimens were carried out.The seismic performance such as stiffness degradation,energy dissipation,ductility and stress-strain of key parts were analyzed.And according to the test results,the influence of prefabricated composite walls on the lateral rigidity and load-bearing capacity of the precast concrete frame is analyzed.?2?According to the detailed parameters of the test specimens,the finite element analysis model of the test specimens was established using the finite element analysis software ABAQUS,and the horizontal force-displacement curve and stress cloud diagram of test specimens under horizontal lateral load were obtained.By comparing with the failure mode and skeleton curve of the test,the correctness of the model is verified.And the non-linear full-process analysis of the three specimens was carried out,and the yield order and stress distribution law of the components of the test pieces were discussed.?3?The standard model was established using the finite element analysis software ABAQUS,and the influence of 10 parameters such as concrete strength(f_cu),light polymer material strength?f_c?,span-to-height ratio?L/H?,axial compression ratio?n?,walls thickness?T?and cold-formed thin-walled steel strength?f_y?on the initial stiffness and peak bearing capacity of the assembled concrete frame with prefabricated composite walls structure was analyzed.?4?Precast concrete frame structures filled with prefabricated composite walls was simplified using the principle of equivalent bracing,and a simplified formula of the lateral stiffness of the structure was derived.The correctness of the formula was verified by comparing with the results of the parameter analysis and The theoretical basis for the practical application of the structural system was provided.