The Effect of Various Patterns of Internal Partitions on the Fundamental Period of Reinforced Concrete Framed Buildings -Experimental and FE Modelling Study

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Qarout, Ola Mohsen
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جامعة النجاح الوطنية
Reinforced concrete (RC) with infill wall partitions are common structures in Palestine. The presence of infill walls can definitely influence the seismic behavior of the structure, as they contribute to the total mass and stiffness of the structure. Specifically, the fundamental period of the structure, which depends mainly on the stiffness and mass of the structure, can be influenced by the existence of brick walls. Several models were proposed by different researchers to predict the seismic behavior of infill wall structures, and also to study their effect on the fundamental period of the whole structure. However, one obvious shortcoming of these models is that their properties do not match those of the brick walls commonly used in Palestine. Therefore, this thesis involves a study to predict the stiffness of brick walls used in Palestine based on 3-D nonlinear F.E. analysis. Some needed parameters in this modeling are taken from experimental tests which were conducted as a part of the work of this thesis. The results of this study were used to develop strut models equivalent to real brick walls. This, in turn, would facilitate modeling and analysis of buildings by using struts as substitutes to brick wall partitions. After that, the effect of these partitions on the fundamental period of the structure was studied. For this goal, macro modeling of RC framed structure was carried out with several patterns of partitions. The results of this study were simplified into two simple, reasonable and practical equations. One of these equations is used for predicting the equivalent strut width as a function of wall length and the column size of the surrounding frame. The other equation is used for predicting the fundamental period of the structure with infill wall partition as a function of the density of partitions distribution in the structure.