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原文传递 Seismic Performance of Axially Restrained Reinforced Concrete Frame Beams

题名：	Seismic Performance of Axially Restrained Reinforced Concrete Frame Beams
正文语种：	英文
作者：	Liping Wang1; Ying Tian, M.ASCE2; Wenwen Luo3; Guichen Li4; Wei Zhang5; Siwei Liu6; Chunyu Zhang7
作者单位：	1Associate Professor, School of Civil Engineering and Architecture, Chongqing Univ. of Science and Technology, Chongqing 401331, China; Visiting Scholar, Dept. of Civil and Environmental Engineering and Construction, Univ. of Nevada, Las Vegas, NV 89154. 2Associate Professor, Dept. of Civil and Environmental Engineering and Construction, Univ. of Nevada, Las Vegas, NV 89154 (corresponding author). 3Lecturer, School of Civil Engineering and Architecture, Chongqing Univ. of Science and Technology, Chongqing 401331, China. 4Graduate Student, School of Civil Engineering and Architecture, Chongqing Univ. of Science and Technology, Chongqing 401331, China. 5Graduate Student, School of Civil Engineering and Architecture, Chongqing Univ. of Science and Technology, Chongqing 401331, China. 6Graduate Student, School of Civil Engineering and Architecture, Chongqing Univ. of Science and Technology, Chongqing 401331, China. 7Ph.D. Student, Dept. of Civil and Environmental Engineering and Construction, Univ. of Nevada, Las Vegas, NV 89154.
关键词：	Reinforced concrete frame; Axial restraint; Beam elongation; Beam-column joint
摘要：	Reinforced concrete beams tend to elongate after flexural cracking and yielding; however, the elongation is restrained by the surrounding structural components in a RC moment frame. Experiments were conducted on seven 1=2-scale interior beam-column subassemblies to study the effects of axial restraint on the seismic performance of RC frame beams and beam-column joints without the presence of floor slabs. The test setup permitted applying axial restraint to beam ends and measuring the compressive axial force passively generated in the beams. Major test variables included beam flexural reinforcement ratio and axial restraining rigidity. Without axial restraint, the total beam elongation reached 3.75% of the beam height at 3% lateral drift. Under the considered levels of axial restraining rigidity, large compressive axial force developed in the beams, leading to an axial force ratio up to 0.25. The axial restraint increased both beam flexural stiffness and strength. Depending on the tensile reinforcement ratio, beam flexural capacity increased 40%–150% at 3% drift. Compared with the unrestrained specimens, the axially restrained specimens suffered greater damage in the beam plastic hinge regions and beam-column joints due to the dramatically increased shear demand, which can negatively impact the seismic performance of a RC frame.
出版年：	2019
期刊名称：	Journal of Structural Engineering
卷：	145
期：	5
页码：	1-12