Analytical and experimental studies on infilled RC frames

Department of Civil Engineering, Kirikkale University, 71450, Yahsihan, Kirikkale, Turkey; Department of Civil Engineering, Maltepe University, 34857, Maltepe, Istanbul, Turkey
International Journal of the Physical Sciences 11/2010; 5:1981-1998.

ABSTRACT Although hollow brick infills, widely used as partition walls, are considered as non-structural members, experimental studies revealed that hollow brick infills have favourable effects on strength and stiffness of structures. In this work, analytical studies were conducted to investigate the hollow brick infill behaviour, in which infills were modeled by diagonal compression struts. Results were compared with experimental ones obtained from tests of one-bay, one or two story reinforced concrete (RC) frames, tested under both vertical and reversed-cyclic lateral loads simulating earthquake. Test frames have intentionally been constructed poorly to reflect the most common deficiencies encountered in Turkey such as strong beam-weak column connections, insufficient confinement, low-grade concrete, poor workmanship and insufficient lap-splice length. Experimental studies shows that hollow brick infills increased both strength and stiffness of RC frames. Analytical studies conducted, shows that hollow brick infills could adequately be modeled by diagonal compression struts.

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    ABSTRACT: Masonry has been used for hundreds of years around the world in construction projects ranging from simple roadways to complex arch designs. Masonry is also commonly used in frame building structures as infill to either protect the inside of the structure from the environment or to divide inside spaces. During the design and analysis of steel/reinforced concrete frame structures, infill has commonly been ignored. Contrary to common practice, masonry infills do influence the overall behavior of structures when subjected to lateral forces. The influence of infills on overall behavior of the structure has been found to change with the direction in which the load is applied. This report gives guidelines on evaluating the lateral load capacity of infilled panels for in-plane and out-of-plane loading. Further guidelines account for the effect of out-of-plane loading on in-plane capacity. This report is a complement to applicable provisions in FEMA 310 with respect to seismic evaluation of buildings. These guidelines should prove useful for engineering evaluations of the lateral strength of buildings with respect to wind or earthquake forces. The guidelines give the engineer a strength-based alternative to FEMA 273 a performance-based method, which should also result in safe and economical construction.
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    ABSTRACT: There is an urgent need to retrofit the deficient mid-rise reinforced concrete frame buildings in Turkey. For this purpose, an efficient FRP retrofit scheme was developed, in which hallow clay brick infill walls are utilized as lateral load resisting elements. The main premise of this practical retrofit scheme is to limit interstory deformations by FRP strengthened infill walls that are integrated to the boundary frame members through FRP anchors. Based on failure modes and measured deformation limits obtained from a large database of experiments, a diagonal compression-strut and tension-tie model is developed. The model is verified with a number of reinforced concrete frame test results with and without upgrades. Furthermore, results of a case study conducted on a typical building frame revealed that strength levels similar to that of a RC shear wall retrofit scheme can be obtained through the FRP retrofit alternative resulting in a displacement ductility of about four.
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    ABSTRACT: Keywords: Seismic Rehabilitation, Precast Concrete Panels, Hollow Claw Tile Infilled, Reinforced Concrete Frames, Reversed Cyclic Loading. Thesis (M.S.)--Middle East Technical University, 2003.


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