Research On The Effect Of Infill Walls On The Seismic Performance Of Reinforced Concrete Frames Base On Damage Of Wen Chuan Earthquake

Damage identification of 1141 houses in Wenchuan County had Completed by the expert group organized by Construction of Guangdong Province after Wenchuan earthquake occurred in May 12, 2008. It brought back valuable information for this paper.The damage phenomenon of infill wall in frame was widespread in this appraisal. Various damage forms ranged from minor cracking to the overall collapse was caused by the earthquake. It caused threats to people's lives and property losses directly. It also brought psychological shadow to people. Domestic and international engineering had already paid close attention to the performance of lateral of infill wall as a subsidiary member. Infill wall was equivalent to the load on beam in traditional design. In this way, factors such as the effect of stiffness of the wall would be ignored. The damage showed the importance effect of these factors, so non-structural damage and the loss caused by it is no longer considered as a minor factor, but must be taken seriously.It is necessary to propose a reasonable and effective simplified model to analyze the effect of the infill walls on the frame. In this thesis,first,existing models are summarized and compared.For the infill walls without hole,three-strut model proposed by Wale was used. The simplified model of infill walls with hole was suggested,too. Moreover, the validity of the proposed models are verified by modeling existing experiments.The damage phenomenon of fill wall in Wenchuan County was added up. Typical infilled frame structures was chosen.Based on alaysis of mode of vibration resolving,top and interstorey displacementof current structureis put forward.Linear analysis based on vibration response spectrum method used on walls and no wall model to study the structural strength, stiffness and force structure.The impact of infill wall on seismic performance of frame structure was summarized. Review infill walls on the seismic performance of frame structures.With the aid of finite element analytical software SAP2000, made the nonlinear static analysis for Typical frame structures,by using two types of analysis model.Capacity spectrum method was used to achieve the seismic response and get the performance point. The base shear, Vertex displacement, Maximum story drift and the hinge case were analyzed to clear the nonlinear response of structure under the earthquake. Then give the evaluation of the structures according to the inter-story drift ratio.Design the two structures according the traditional method and the method proposed in this paper. Made the nonlinear static analysis for two types of model. The pros and cons of the method of simulating the infill walls in tradition were analyzed and summarized. The analysis of the rationality and advantages of the new method was given by comparing the two results of the structure response.