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Use of Steel Bracing for Minimizing Captive Column Effect of R.C. Frames

Shailendra kumar Dubey, Sunil Kute

Number of buildings is constructed with partial masonry infill for serviceable or artistic reasons. Sometimes openings have been left a window or ventilator in the wall for architectural necessities. Constructions with such partial masonry infill face serious damages because of captive-column effect at the time of earthquake. Due to complex behavior of partial infill, structures are analyzed and designed as bare frames. The purpose of this research is to investigate the behavior of Reinforced Concrete (R.C.) frames by using steel bracing under horizontal loading and to decrease the potential for captive-column damage. An experimental study is carried out on single, single storey for R.C. frames with bare and corner steel bracing. All such frames were tested up to collapse and subjected only to monotonic static lateral load to obtain an effective and possible solution for captive column. In comparison to bare, braced frames have noteworthy increase in lateral load capacity. Central bracing is more effective than that of corner bracing. For same load braced frames have considerable less deflection than bare frames.