Based on a three-story RC frame

the analysis of the structure with various layouts of infill walls under frequent earthquake was conducted. The results indicate that when the infill walls and their different layouts are incorporated into the structural model

the seismic performance

such as dynamic properties

characteristics of regularity

and internal force distributions would change significantly. It should be also mentioned that because of the constraint of infill walls

the sum of moments at column ends is much larger than that at beam ends at the frame column-beam joints. It is suggested that infill walls should be adequately considered in the mechanical models during seismic analysis.