A Study of Shear Strength Degradation of High Strength Concrete Beam-Column Joints for Seismic Resistance

• Main Authors: Yi-Feng Liu, 呂宜峰
• Other Authors: Shyh-Jiann Hwang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/62415970639707735883

碩士 === 國立臺灣科技大學 === 營建工程系 === 89 === For maintaining the dissipation capacity of structural frames, the failures of beam-column joints should be avoided. Therefore, an evaluation measure to determine the adequacy of strength to prevent the joint failure is needed. The ACI 318-99 Code could not clearly evaluate the shear strength of various joints. The current code adopts the empirical limitations on parameters to ensure the joint on achieving it’s shear strength. Moreover, the code-provided equation does not reflect the shear strength degradation under the increasing ductility. Therefore, the current code provision of the joint strength is not suitable for above purpose. The objective of this study was to estimate the shear strength degradation of beam-column joint under the increasing ductility. Total of 6 specimens without hoop confinement in the joint were tested. The test parameters include the beam steel ratio, which generates different stress levels and ductility requirements of joint, and the axial loading of column, which simulates the loading of low-rise buildings. Based on the softened strut-and-tie model and the test results, a model to predict the shear strength degradation of beam-column joints for seismic resistance is proposed.