Strengthening of reinforced concrete buildings with soft story irregularity

Mahmud Sami Döndüren; Abdulhamit Nakipoğlu

doi:10.3139/120.111345

Article

Strengthening of reinforced concrete buildings with soft story irregularity

Mahmud Sami Döndüren and Abdulhamit Nakipoğlu

Published/Copyright: April 30, 2019

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From the journal Materials Testing Volume 61 Issue 5

Abstract

Turkey is one of the most earthquake-prone countries in the world. The studies on the damaged buildings with reinforced concrete structural systems, especially done after the 1999 Gölcük earthquake and other earthquakes in the past, showed that the negative effects of the structural irregularities in the buildings come to light through the impact of earthquake load. They also revealed that the regularity of structural systems is one of the main principles in the design of earthquake resistant reinforced concrete structural systems. In this study, two-story single-span 1/3 scaled reinforced concrete test specimens having soft story irregularity (interstory stiffness irregularity) and insufficient earthquake resistance were tested by applying different strengthening methods. The purpose of strengthening applications is to eliminate the adverse effects of the soft story irregularity. Reversed-cyclic lateral load was applied on the test specimens to simulate the earthquake effect. While the upper stories in all the test specimens had infill walls, the lower stories had been strengthened using different types of steel bracings. The first frame was strengthened with K-type shaped (<>), the second one with straight V-type (V) and the third with turned sideways V-type (>) steel diagonal elements. As a reference to these three strengthened frames, the following two frames, which were taken from another study, were used; a frame with both stories having infill walls and a frame with infill walls on the upper story, which is empty on the lower story. As a result of the study, load and displacement histories, hysteresis and envelope curves and energy dissipation graphs of these three strengthened reinforced concrete frames were obtained. Furthermore, all the experimental results, obtained graphs and the data from the reference frames were compared and interpreted. The results show that the frame strengthened with K-type steel bracings is the best solution to reduce the effect of soft story irregularity.

∗Correspondence Address, Assoc. Prof. Dr. Mahmud Sami Döndüren, Department of Civil Engineering, Faculty of Engineering and Natural Sciences, Konya Technical University, 42130, Konya, Turkey, E-mail: sdonduren@selcuk.edu.tr, anakipoglu@selcuk.edu.tr

Dr. Mahmud Sami Döndüren is Associate Professor at the Department of Civil Engineering, Selcuk University, Konya, as well as Vice Dean of the Engineering and Natural Sciences Faculty of Konya Technical University, Konya, Turkey. His areas of expertise include engineering mechanics, solid mechanics, seismic performance of masonry structures, seismic performance of reinforced concrete structures as well as strengthening applications of buildings.

Abdulhamit Nakipoğlu, born in 1990, received his B.Sc. degree in Civil Engineering from Gaziantep University in 2013. He has been working as Research Assistant at Selcuk University, Konya, since 2015. He also received his M.Sc. degree in Civil Engineering from Selcuk University in 2018 and started his Ph.D. studies in 2018 at Konya Technical University, Kony, Turkey. His research interests are engineering mechanics, mechanics of materials, seismic codes, structural system irregularities and retrofitting of reinforced concrete buildings.

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Published Online: 2019-04-30

Published in Print: 2019-05-02

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https://doi.org/10.3139/120.111345