Time history analysis was performed to study the effect of selected parameters in the behaviour of reinforced concrete frames under earthquake loads. The RC frames were designed for gravity-loads only as typically found in most seismic prone countries before the introduction of adequate seismic design code provisions. The parameters considered in this study were the number and span of bays, the number of stories, and the presence of infill wall (full infilled frame and infilled frame with open ground stories). It was observed that the presence of infill wall may affect the seismic behaviour of frame structure to large extent, and the infill wall increases the strength and stiffness of the structure. Also it was observed that infilled frames are preferred in seismic regions than the open ground story ones, because the story drift of first story in open ground story frames is very large than the upper stories, this may probably cause the collapse of structure.
The macro-models method is one of the main categories for modeling infills based on the equivalent strut method. The basic parameter of these struts is their equivalent width, which affects the stiffness and strength. This paper presents a general review of several expressions proposed by researchers to calculate this equivalent width. The comparative study of different expressions shows that the Paulay and Priestley equation is the most suitable choice for calculating the diagonal equivalent strut width, due to its simplicity and because it gives an approximate average value among those studied in this paper. Consequently, the model will be used in our further study for analysis of RC infilled frames.
The roof lateral displacement for RC frames is very significant parameter in performance based engineering and should be within acceptable limits as per the requirement of different performance levels. Data obtained from the time history dynamic analysis for a series of gravity load designed (GLD) RC frame was used as input data in a statistical program called SPSS 16.0, and a statistical analysis was done and a power equations was proposed to estimate the roof lateral displacement for the GLD RC frames. Three equations were proposed for estimating the roof lateral displacement. The first one is for the bare frame models, the second is for infilled frame models and the third is for infilled frame with open ground story. The equations for estimating the roof lateral displacement for GLD frames with different type of infill (bare, infilled and open ground story models) are proved to be acceptable accuracy and they can be used to estimate the roof lateral displacement for GLD RC frames if they meet the conditions set out.
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