|Table of Contents|

Experimental Research on FRP-steel Composite Tube Confined High-strength Concrete Short Column Under Axial Compression(PDF)

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

Issue:
2022年06期
Page:
113-121
Research Field:
结构工程
Publishing date:

Info

Title:
Experimental Research on FRP-steel Composite Tube Confined High-strength Concrete Short Column Under Axial Compression
Author(s):
ZHANG Jian-rui1;  HE Ze-zhao2;  MA Kai-ze2
(1. The Engineering Design Academy of Chang'an University Co., Ltd., Xi'an, Xi'an 710061, Shaanxi, China; 2. College of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)
Keywords:
FRP-steel composite tube;  axial compression;  ultimate bearing capacity;  deformation capacity;  peak strain
PACS:
TU398.9
DOI:
10.19815/j.jace.2021.11019
Abstract:
An experimental study on high-strength concrete short columns confined by FRP-steel composite tube was carried out to study the axial compression performance, and the variables included the strength of concrete, the thickness of steel tube, the layer and type of FRP. The restraint mechanism, failure mechanism, axial and circumferential load-vertical strain curves of the specimens were investigated. The results show that all specimens show similar failure modes, FRP is broken and the steel is buckled and deformed obviously. The increases in the thickness of steel tube and strength of concrete can effectively improve the ultimate bearing capacity of the short columns, but the increase of concrete strength weakens the deformation capacity and increases the degradation rate of the bearing capacity. The increase in the layer number of FRP improves the bearing and plastic deformation capacities of the short columns, and decreases the degradation rate of the bearing capacity, but it has little effect on the stiffness in the elastic and decline stages and the strengthening platform stage. The improvement of CFRP on the bearing capacity is more obvious than that of GFRP, but the short columns confined by CFPR shows a faster degradation rate in the bearing capacity. Compared with CFRP, GFRP delays the stiffness degradation of short columns more obviously. When FRP breaks, the strains of CFRP and GFRP at the measured point are only 0.54 times and 0.56 times of the limit strain. The calculated results of the proposed calculation methods of axial bearing capacity and peak strain of short columns are in good agreement with the experimental results.

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Last Update: 2022-12-20