|Table of Contents|

Degradation analysis of flexural performance of marine concrete beams under combined action of chloride and repeated load(PDF)

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

Issue:
2023年05期
Page:
52-59
Research Field:
建筑结构
Publishing date:

Info

Title:
Degradation analysis of flexural performance of marine concrete beams under combined action of chloride and repeated load
Author(s):
LU Chunhua1 SONG Zepeng1 LI Zhongao1 ZHANG Julian2
(1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China; 2. Shanghai Horizon Construction Technology Co. Ltd., Shanghai 201800, China)
Keywords:
marine concrete beam chloride environment repeated load flexural performance
PACS:
TU375.1
DOI:
10.19815/j.jace.2021.12111
Abstract:
To investigate the degradation law of flexural performance of marine concrete beams under the combined action of chloride and repeated load, silica fume, fly ash and nano-silica were selected to prepare 3 groups of 10 marine concrete beams. By means of self-anchoring in pairs and setting water absorbent sponge at the tension zone of test beams, the repeated loads were applied to the test beams together with the dry-wet cycles of chloride solution. The flexural performance of the test beam was evaluated after 30 cycles. Combined with the test results, the influence coefficient α(λ) of repeated load level λ on the degradation of flexural capacity of marine concrete beams was proposed, and the calculation formula of the degradation of flexural capacity of marine concrete beams was given. The results show that the load-deflection curve of the beam only subjected to chloride dry-wet cycle is similar to that of the contrast beam, and the ultimate bending moment is slightly increased. For the beam under the combined action of chloride and repeated load, with the increase of repeated load level, the development of flexural crack and the failure mode does not change significantly, but the ultimate bending moment shows obvious degradation, and the deformation capacity and ductility of the test beam decrease significantly. Under the same condition, the flexural performance of marine concrete beams mixed with fly ash and silica fume is better, and the degradation degree of flexural performance under the combined action of chloride and repeated load is lower. The rationality and validity of the bending capacity degradation formula are verified by comparing the experimental results with the formula prediction results.

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Last Update: 2023-09-01