Experimental study on seismic performance of stiffening ring joint of T-shaped concrete-filled rectangular composite steel tubular column and RC beam

被引：0

作者：

Liu J. ^{[1
,2
]}

Dai S. ^{[1
]}

Huang J. ^{[1
,2
]}

Huo K. ^{[1
]}

Zeng H. ^{[2
]}

机构：

[1] School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan

[2] Design & Research Institute Co., Ltd, Wuhan University of Technology, Wuhan

来源：

Dai, Shaobin (dsb123@whut.edu.cn) | 2016年 / Science Press卷 / 37期

关键词：

Bearing capacity; Frame side joint; Initial stiffness; Quasi-static test; Seismic performance; T-shaped concrete-filled rectangular composite steel tubular column;

D O I：

10.14006/j.jzjgxb.2016.08.003

中图分类号：

学科分类号：

摘要：

A stiffening ring joint of T-shaped concrete-filled rectangular steel tubular column and RC beam was proposed on the basis of traditional external stiffening ring joint. Taking the length of corbel, diameter and arrangement of ring rib as the main parameters, seven joints were designed. The failure modes, mechanical properties and seismic performances were discussed according to the static and quasi-static tests. The results indicate that the specimens with ring ribs show a typical plastic hinge failure mode formed at the end of the beam. The failure of specimens without ring rib is caused by the tearing of welds between the corbel flange and steel pipe, and presents brittle failure characteristics. Before yielding, most of the bending moments are resisted mainly by longitudinal reinforcements, the bending moments and shear forces are transferred by ring ribs and corbels between the column and beam. The shapes of hysteresis curves of specimens with ring ribs are full and present arched shape. However, the hysteretic loop of specimen without ring rib is pinched seriously and presents 'Z' shape indicating poor energy dissipation. The strength degradation trend of each specimen is consistent. The secant stiffness variations are almost similar and both of them represent significant degradation. The proportion of shear deformation of joint region in the structural deformation is almost negligible. The initial stiffness and ultimate load are improved significantly with the increase of the length of corbel. The ring bar with small diameter can yield under cyclic loading. There is little effect of reducing the number of the ring bar on the initial stiffness and energy dissipation capacity, but the bearing capacity appears a certain degree of reduction. The seismic performances of the joints are good and the seismic design concepts of 'strong joint and weak member' can be realized. © 2016, Editorial Office of Journal of Building Structures. All right reserved.

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页码：23 / 32

页数：9

共 20 条

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