|Table of Contents|

Research on Compressive Carrying Capacity of Circular Steel Tubes Strengthened with Carbon Fiber Reinforced Polymer(PDF)

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

Issue:
2020年06期
Page:
55-63
Research Field:
Publishing date:

Info

Title:
Research on Compressive Carrying Capacity of Circular Steel Tubes Strengthened with Carbon Fiber Reinforced Polymer
Author(s):
GAO Xiao-yu;  DUAN Hai;  YANG Zheng-pu;  LI Zhao-yang;  LIU Yong-jian
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
CFRP;  axial compression;  fiber model method;  compressive carrying capacity
PACS:
TU392.3
DOI:
-
Abstract:
Based on the test results of axial compression of long circular steel tube strengthened with carbon fiber reinforced polymer(CFRP), the mechanical behavior of CFRP in the loading process was analyzed, and the failure and reinforcement mechanism of CFRP were proposed. Considering the effects of initial eccentricity, material and geometric nonlinearity, a fiber model was established to predict the bearing capacity, axial and lateral displacements of CFRP. The relationship between the effective compressive elastic modulus of CFRP and the number of CFRP layers was analyzed. The effective compressive elastic modulus was applied to the finite element model to simulate the loading test, and the rationality of the simplified fiber model was verified. The results show that before the ultimate bearing capacity is reached, the central section of the circular steel tube axial compression member shows compressive strain, which verifies the proposed reinforcement mechanism. With the increase of CFRP layers, the effective compressive elastic modulus of CFRP increases according to natural logarithm. The introduction of effective compressive elastic modulus well simulates the compression mechanism of CFRP strengthened steel pipe, and the calculation results of fiber model are in good agreement with those of finite element model.With the increase of loading eccentricity, the contribution rate of CFRP to the bearing capacity of long axial compression members gradually decreases. Therefore, the loading eccentricity should be reduced as much as possible to make full use of the compressive strength of CFRP.

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