|Table of Contents|

Research on Hysteretic Behavior of Flange Weakened Joint with Replaceable Beam Section(PDF)

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

Issue:
2022年06期
Page:
74-86
Research Field:
结构工程
Publishing date:

Info

Title:
Research on Hysteretic Behavior of Flange Weakened Joint with Replaceable Beam Section
Author(s):
ZHENG Hong;  SHANG Yong-fang;  SU Yao-xuan;  DAI Yong-chao
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
beam column joint;  replaceable beam section;  hysteretic behavior;  initial rotational stiffness
PACS:
TU391
DOI:
10.19815/j.jace.2021.08011
Abstract:
For the problem that it was very difficult to repair the structure of steel frame flange weakened joints after earthquake,based on the concept of post earthquake replaceable seismic design, a new type of flange weakened joint RFJ with replaceable beam section was proposed. Through ABAQUS modeling, the mechanical properties of common end plate connection joint CPJ and RFJ under monotonic and cyclic loads were compared, and the variable parameter analysis of RFJ was carried out. The results show that the hysteresis performance of RFJ is better than that of CPJ and can be easily replaced after a large earthquake. With the increase of the weakened length b of the beam flange, the bearing capacity of the joint decreases gradually, and the ductility coefficient increases firstly and then decreases. Although the energy consumption capacity is improved, the degradation effect of strength and stiffness is not ideal. It is suggested that the length of weakened section of beam flange b=(0.7-0.9)hb(hb is the height of steel beam section). When the length of replaceable beam section l is too large, the initial stiffness and ductility of the joint will be reduced and the energy dissipation capacity of the joint will be adversely affected. If the length of replaceable beam section l is too small, the stress value at the weld of the joint will be too large, affecting the effect of plastic hinge outward movement. Considering comprehensively, it is suggested that the length of replaceable beam section l=(1.6-1.85)hb.

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Last Update: 2022-12-20