Retrofit of nonductile reinforced concrete columns of mid-rise buildings using reinforced concrete jacketing
| Autor: | Yen-Yu Lai, 賴彥宇 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 The 2016 Meinong Earthquake of Kaohsiung caused severe damage to many reinforced concrete (RC) buildings. From the many damaged buildings, it can be seen that several are buildings that were built 20 years ago and have seven or more floors but are less than 50 meters in height. The columns of this type of buildings usually have non-ductile reinforcement details, such as low amounts of transverse reinforcement, which caused poor concrete confinement and insufficient shear strength. Moreover, the columns of this type of buildings are usually subject to high axial compression. Due to these reasons, the columns of several buildings of this type showed brittle collapsed during the 2016 Meinong Earthquake, leading to collapse of stories or even the entire building and causing severe casualty. Therefore, it is necessary to examine the seismic behavior and retrofit methods for the columns of this type of buildings. This research aims to develop RC jacketing methods for retrofit of mid-rise nonductile RC building columns. This reseach will first collect the design data of the lower-story columns of real mid-rise buildings that were built around 20 years ago. The material properties, reinforcement details and amounts of axial load will be examined. Based on the design data, column specimens to represent origal columns of the buildings will be designed. Then, retrofit methods using RC jacketing will be developed and retrofitted column specimens designed. Finally, this research will conduct double-curvature cyclic tests on original columns and retrofitted columns to investigate the effectiveness of the proposed RC jacketing methods. Literature review has been completed and a test database of columns retrofitted with reinforced concrete jacket has been established. Based on the results of the literature review and the design data of the lower-story columns of real mid-rise buildings that were built around 20 years ago, seven large-scale column specimens have been designed and constructed. The construction has verified the constructability of the proposed retrofit scheme. Testing of the column specimens is currently in progress.The three specimens had been finished the test. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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