The Analysis Of Infill Walls On The Seismic Behavior Of Reinforced Concrete Frames

Infilled frames are used widely around the world because of its economic adaptability and relatively good seismic performance. Infilled walls are used to divide frame into many rooms. In the past decades, the effect of subsidiary structrues belonging to frames were ignored. It leaded to many serious damages in earthquake.Infilled walls that belong to subsidiary structures have great effete on seismic performance of frames.It may result in adverse consequence that infilled wall are setted unproperly.In Previous earthquakes, many frames were heavily damaged because of ignoring the effect of infilled frames.For example, it may result in torsion failure of frames that infilled walls are setted unevenly in vertical direction, the story lateral stiffness of frame changes suddenly in the bottom and the bottom becomes a soft storey.Now,the researchers conducted a study at home and abroad,but generally speaking, infilled wall frame structure of the study is still at a preliminary stage,a lot of work remains to be done. Therefore,this paper would mainly to the following studies:(1) It is necessary to propose a reasonable and effective simplified model to analyze the effete of the infill walls on the frame.In this thesis, first, existing models are summarized and compared .models are summarized and compared .For the infill walls without openings,three-strut model proposed by Wale are used in this thesis and the determining method of model parameters is ameliorated .In addition,existing researches mainly focus on the infilled frames without openings,but, in fact, it is possible to have door or window on the walls because of the practical needs.So,it is necessary to do some study on the infilled frames with openings. In this thesis,the simplified models of the infilled frames with and without openings are proposed.Moreover, the validity of the proposed models are verified in accordance with previous experimental data by using sap2000 finite element analysis software to establish and test the same model.(2) Establishing the model of this paper to carry out the structural modal analysis and time history analysis. Then, inputing the seismic wave and analysising the seismic force,the vibration characteristics, displacement and internal force of reinforced concrete frame structure will be done by changing the certain parameters of structure, such as infilled amount, infilled rate, the layout of wall layout and so on.(3) With regard to the wall infilled open holes, comparing with the internal force in the way of different hole size and different openings.