Seismic Shear Behavior of High-Strength Reinforced Concrete Columns

• Main Author: NGUYEN VAN BAO NGUYEN
• Other Authors: Chien-Kuo Chiu
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/19228230803625900374

碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === The use of high-strength reinforcement and high-strength concrete in reinforced concrete structures can help either to decrease the size of concrete components or to increase the spans of floor in concrete buildings. In addition, the combination of high-strength concrete and high-strength shear reinforcement could result in decreasing the consumption of aggregate and steel, then promoting environmental sustainability. In previous research, 25 high-strength columns have been tested with shear span to depth ratio (a/d) of 1.88. Moreover, based on the test data of 61 high-strength columns, the ratio a/d varies from 1.25 to 1.88. However, the a/d ratio of columns in high-rise building can exceed 1.88, particularly in the first story which is typically higher than the other stories. Therefore, it is necessary to investigate shear behavior of high-strength columns with a/d ratios larger than 1.88. The objective of this research is to investigate the shear behavior of high-strength columns with a/d ratio equal to 2.5. Seven columns were tested to examine shear behavior under low axial load ratio of 10%. Others design parameters that were investigated include the specified yield strength of shear reinforcement (280 MPa, 420 MPa and 785 MPa) and the amount of shear reinforcement. The test result was used to investigate the applicability of shear-strength equation in ACI 318 Code on columns with material strengths higher than the code limit. In the evaluation, the actual concrete compressive strength and the proposed yield strength of transverse reinforcement was used.