|Table of Contents|

Study on Bonding Performance and Debonding Capacity of RC Beam Strengthened with NSM Aluminum Alloy Bars(PDF)

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

Issue:
2021年01期
Page:
41-50
Research Field:
Publishing date:

Info

Title:
Study on Bonding Performance and Debonding Capacity of RC Beam Strengthened with NSM Aluminum Alloy Bars
Author(s):
XING Guo-hua;  LUO Xiao-bao;  MA Jun;  CHANG Zhao-qun;  DANG Hui-xue
(School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
concrete beam;  NSM;  aluminum alloy;  finite element;  bond stress-slip relationship;  debonding capacity
PACS:
TU377.9
DOI:
10.19815/j.jace.2020.08053
Abstract:
Through experimental research and finite element analysis, the failure mode and bearing capacity of concrete beams strengthened with near surface mounted(NSM)aluminum alloy(AA)bars were analyzed, different debonding capacity calculation models were compared, the distribution curves of stress and strain of the AA bars and interface bond stress along the beam span direction were obtained, and the interface bond stress-slip relationship and the calculation formula of debonding capacity were derived. The results show that there are two modes of interface debonding failure of concrete beams strengthened with AA bars, namely, the intermediate crack debonding and concrete cover separation. The flexural performance and deformation performance of concrete beams are improved after the beams being strengthened. The intermediate crack-induced debonding between NSM bars and concrete is induced by the extension of bending cracks in the constant moment region. The concrete cover separation occurs because of the extension of several cracks induced by the stress concentration at the end of the NSM bars. Along the direction from mid-span to beam end, the stress and strain of the AA bars gradually decrease, the interface bonding stress firstly increases and then decreases, and the maximum stress increases with the increase of the load. The debonding process of RC beam strengthened with NSM AA bars can be divided into four stages, namely, elastic stage, elastic softening stage, elastic softening debonding stage and softening debonding stage. The proposed calculation model can accurately predict the debonding capacity of concrete beams strengthened with AA bars.

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Last Update: 2021-01-20