Experimental Investigation on Seismic Performances of Knee Joints for Monolithic Precast Concrete Frame

被引：0
|
作者：
Zhao Y. [1 ]
Li Y. [1 ]
Bi Q. [2 ]
Deng S. [2 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] China Southwest Architectural Design and Research Institute Co. Ltd., Chengdu
来源：
Tongji Daxue Xuebao/Journal of Tongji University | 2019年 / 47卷 / 05期
关键词：
Knee joint; Monolithic precast concrete frame; Pseudo-static test; Seismic performance;
D O I：
10.11908/j.issn.0253-374x.2019.05.002
中图分类号：
学科分类号：
摘要：
Five full-scale knee joints of concrete frame with HRB500 reinforcements were designed,and pseudo-static tests were conducted. Seismic performances of two new kinds of precast knee joints were investigated. Failure patterns, hysteretic loops, skeleton curves, displacement ductility, energy dissipation capacity, and ultimate bearing capacity were analyzed. Besides, the calculation method of bending bearing capacity of inclined section in knee joint were proposed. The results indicated that all the precast specimens were subjected to bending failure in the small range of the beam end. There was no crack on the combined interface of frame beams. Compared to the cast-in-situ joint, the precast joints had a greater displacement ductility coefficient and the hysteretic loops were chubbier. The displacement ductility coefficient and ultimate displacement angle of precast joints were from 2.54 to 3.66 and 1/29 to 1/26 respectively. The ductility of specimens without extended column head were greater than that of specimens with extended column head. The average ultimate bearing capacity of precast specimens was about 10% lower than that of the cast-in-situ joint, while the ratio of calculation value to experimental value was from 0.62 to 0.71, still having a high safety degree. © 2019, Editorial Department of Journal of Tongji University. All right reserved.
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页码：600 / 608
页数：8
相关论文
共 17 条
  • [1] Design Code of Concrete Buildings: GB 50010-2010, (2015)
  • [2] Technical Specification for Precast Concrete Structures: JGJ 1-2014, (2014)
  • [3] Xue W., Yang X., Wang Y., Et al., Experimental study on seismic behavior of different type of frame connections with composite beams and cast-in-place columns, Journal of Building Structures, 29, 6, (2008)
  • [4] Tian C., Gao J., Hao W., Et al., Experimental Study on Mechanical Properties of Joints for Precast Frame, (2012)
  • [5] Fu J., Bai S., Design method and construction measure of knee joint for reinforced concrete frame-background information on the new provisions about design code of concrete buildings(GB 50010-2002), Building Structures, 33, 1, (2003)
  • [6] Technical Standard for Precast Concrete Construction: GB/T 51231-2016, (2016)
  • [7] Wallace J.W., Mc Connell S.W., Gupta P., Et al., Use of headed reinforcement in beam-column joints subjected to earthquake loads, ACI Structural Journal, 95, 5, (1998)
  • [8] You Y., Experimental study of concrete knee beam-column joint with headed reinforcement, (2008)
  • [9] Feng C., Experimental research of the beam-column knee joint with HRB500 steel in earthquake-resistant frames, (2007)
  • [10] Recommendations for Design of Beam-column Connections in Monolithic Reinforced Concrete Structures: ACI 352R-02, (2002)
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