The Assessment Of Seismic Performance Of Infilled Frame Structures

Wall-infilled frame system is an often used engineering structural system.The idea that the wall and frame as a system to take vertical and horizontal loads is widely accepted. But in the current design of building structures, engineers generally do not consider wall-infilled and the frame working together. Not considering the function of the wall is not always safe. In the past researchers have studied and improved the mechanical model of wall and frame system, but because of various reasons, these models are not used in the actual design process. Many surveys on the frame in many earthquakes show that damages caused by weak layers and columns destruction are widespread. This damaged type is different from the flexible frame structure assumption. Because of the above problems, the author made the following work:1,Based on published testing results,the paper proposed a simplified wall-infilled frame structure model in elastical response stage.2,The paper establish equivalent bracing layer model using sap2000 by considering stiffness reduction of wall in different floor. Comparing pure framework model with equivalent bracing layer model, standard cycle reduction factor is proposed and proved by several examples.3,Using response spectrum analysis and time history analysis, the paper finds the difference between the current seismic design model(considering the cycle reduction) and the equivalent bracing layer model with the bottom wall.4,Using response spectrum analysis and time history analysis,the paper finds the difference between the current seismic design model (considering the cycle reduction) and the equivalent bracing layer without the bottom wall.