Analysis Of Out-of-plane Seismic Behavior Of Reinforced Concrete Frame Filled Wall Structure

As a widely used structural form,it is very important to study the mechanical behavior and failure form of frame infilled wall under earthquake.In this paper,the nonlinear finite element model of frame masonry infilled wall is established by using ABAQUS software,and the seismic behavior of frame masonry infill wall under the action of low cyclic reciprocating displacement outside the plane is analyzed.The main work includes:(1)The selection methods of material parameters are explained in detail,and the applicable finite element modeling method is compared.The hysteretic curve and the whole process of structural failure are compared with the test by using ABAQUS to carry out finite element analysis and fitting with the test.The model is in good agreement with each other,and the feasibility of the model is verified(2)The hysteretic curve,skeleton curve,stiffness and ductility of frame infilled wall under the action of in-plane displacement are analyzed.The yield point displacement angle,peak displacement angle and limit point displacement angle of the structure with different thickness are obtained,and it is found that the reasonable setting of the infilled wall can improve the ductility of the structure.At the same time,the law of stress and strain development of infilled wall under the action of out-of-plane displacement is analyzed.It can be seen that with the increasing of displacement angle,the larger the wall thickness of frame masonry,the smaller the displacement angle between the cracks and the failure of the wall.(3)The failure mode of longitudinal wall of frame masonry infilled wall under the action of out-of-plane displacement is matched with the stress characteristic point in the plane of transverse frame infilled wall.It is found that when the transverse structure is a pure frame,the longitudinal infill wall has been destroyed completely when the transverse structure reaches the ultimate point of in-plane loading,and when the transverse structure is the 100mm thick frame infilled wall,the longitudinal infill wall is also destroyed when the transverse structure reaches the ultimate point of in-plane loading.When the transverse structure is a 200mm thick frame infilled wall,the longitudinal infill wall is not completely destroyed when it reaches the ultimate point of in-plane loading.(4)The model of frame infilled wall with different opening rate,different hole position and different hole shape was established to analyze the out-of-plane force.It can be seen that the opening rate,the opening position and the shape of the holes in the rigid connection between the frame and the infilled wall have a great influence on the failure form of the infilled wall outside the plane.The smaller the opening rate,the closer the out-of-plane failure of the filled wall is to brittle failure,the closer the opening of the hole is to the column,the smaller the interstory displacement angle of the crack in the filled wall is,and the faster the development is.The smaller the aspect ratio,the greater the displacement angle between the boundary cracks and horizontal transverse joints.