Analysis Of Seismic Performance Of Concrete Frame Structure With Opening Filler Wall

Frame structures are one of the commonly used structural forms in building structures.In this structure,infill walls and frame structure are synergistic,In the current code for seismic design of buildings,this synergy is usually ignored and the method of periodic reduction coefficient is used for seismic design.In order to meet the functional requirements,window and door openings are made on the walls.These openings will inevitably cause a decrease in the lateral rigidity and seismic performance of the wall.Scholars at home and abroad have done a lot of research on frame structures with infill walls,mostly using the method of reducing coefficient of the opening to consider the influence of the opening.This gives a very realistic solution,but there are still many problems to be solved.This research work has been carried out in view of the conditions of opening in infill walls.This paper analyzes the experimental failure process,experimental analysis results done by domestic and foreign scholars on the infill wall frame structure and puts forward many calculation models.By dividing the infill wall and using the principle of "series and parallel",the lateral stiffness of the infill wall with opening is considered and the calculation formula of the equivalent cross section width of the infill wall with the opening is derived by combining the conversion of the lateral stiffness and the equivalent inclined bracing.SAP2000 is used to establish the frame model with infill wall having an opening frame model and nonlinear static analysis of the model is carried out.The results are compared with the curves of the relation between the inter-story shear and the inter-story displacement obtained by previous scholars and the validity of the calculation formula of the equivalent slanting width proposed in this paper is checked.18 infill wall frame models are built based on the area ratio of portal area,the location of openings,the form of the openings and the vertical placement of infill walls.Based on the parameters such as the area ratio of the openings,the location of the openings,the shape of the openings,and the vertical placement of the infill walls,18 infill wall frame models were established.The influence of each parameter on the shear force and the inter-story displacement angle is analyzed by the response spectrum method and time-history analysis and the modal analysis of the model is carried out.The results show that when the area opening area exceeds 50% the area of the infill wall,the contribution of the infill wall to the lateral stiffness of the frame is very small,which is almost equivalent to the pure frame structure.At the same time,the change of theposition of the entrance and the shape of the hole has little effect on the structure and the shear value of the layer is only 13%.Irregular vertical layout of the hole will lead to uneven distribution of the vertical stiffness of the frame structure.The presence of a weak layer at the bottom layer will have the greatest impact on the structure and the minimum on the top layer.