Abstract

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EFFECTS OF OPENINGS IN CONCRETE

DINDAR MOHAMMED SALEEM SADEEQ


The results of a time history study for tall concrete buildings are presented, addressing the effects of openings in concrete shear walls under near fault earthquake ground motions. A ten-story building was modeled with three different types of lateral resisting systems: complete shear walls, shear walls with square opening in the center and shear wall with opening at right end side. Studied models were analyzed with nonlinear software under the two mentioned records. The purpose of this paper is to review the advances that have been made in the design of monolithic and precast reinforced concrete walls, both with and without openings, subject to eccentrically applied axial loads. Using the results of previous experimental studies, a database was assembled to enable statistical assessment of the reliability of existing design models. Several design aspects are highlighted, including the size and position of openings, and the roles of boundary conditions and geometric characteristics. In addition, the performance of fiber-reinforced polymers in strengthening wall openings is discussed. Over- all it is found that design codes provide more conservative results than alternative design models that have been proposed in recent studies. Research into the strengthening of walls with openings is still in its early stages, and further studies in this area are needed. The paper therefore concludes by highlighting some areas where new investigations could provide important insights into the structural behaviour of strengthened elements.