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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:

2019年02期

Page:

84-91

Research Field:

Publishing date:

Info

Title:

Seismic Behavior of Square Tube Confined Steel-reinforced Concrete Column-RC Ring Beam Joint

Author(s):

NIE Shao-feng¹;  YE Meng-na¹;  WU Yang-fan¹;  DING Wu-xia²;  ZHU Ji-zhao¹

(1. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China; 2. Anar Group Incorporated Company, Beijing 100079, China)

Keywords:

square tube confined steel-reinforced concrete column;  seismic behavior;  RC ring beam joint;  low cyclic loading

PACS:

TU398

DOI:

-

Abstract:

In order to study the seismic behavior of square tube confined steel-reinforced concrete column-RC ring beam joint, the finite element model of the joint was established by using finite element analysis software ABAQUS. The correctness of the finite element calculation results was verified by the comparative analyses of circular steel tube confined steel-reinforced concrete column-RC ring beam joint in the existing tests. Then the numerical analyses of the mechanical behavior of square tube confined steel-reinforced concrete column-RC ring beam joint was carried out. The failure mode, hysteresis curve, skeleton curve and joint ductility of the joints under low cyclic loading were studied. The effects of inner steel ratio of section, axial compression ratio and reinforcement ratio of ring beam on the seismic behavior of the joints were also investigated. The results show that the hysteretic curves of square tube confined steel-reinforced concrete column-RC ring beam joint is full and the joint has good seismic behavior. After setting the ring beam in the core area of node, the failure mode of the joint specimen is the plastic hinge failure at the end of beam. The ring beam has the protection effect obviously on the core area of the joint, and the joint satisfies the seismic design principles of “strong column and weak beam” and “strong-joint and weak-member”. With the decrease of the inner steel ratio of column and the reinforcement ratio of ring beam, the maximum load, ductility coefficient and seismic performance of joints decrease, and the strength degradation is accelerated. The axial compression ratio has great influence on the seismic behavior. If the axial compression ratio increases from 0.31 to 0.63, the ductility coefficient of the specimen is reduced from 4.14 to 2.12, and the decreasing amplitude of the maximum load is as high as 15.16%.

References:

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Memo

Memo:

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Common functions

Last Update: 2019-03-27